BioMed Research International
Volume 2020 (2020), Article ID 2056340, 10 pages
https://doi.org/10.1155/2020/2056340

Research Article

Clinical Orodental Anomalies in Taiwanese Children under Age Six: a Study Based on the 1995-1997 National Dental Survey

Po-Sen Chang,¹ Tzung-Hai Yen,2,3,4 Chun-Jui Huang,5,6 Amy Ming-Fang Yen,⁷ Sam Li-Sheng Chen,⁷ and Aileen I. Tsai¹

¹Department of Pediatric Dentistry, Chang Gung Memorial Hospital, Linkou, Taiwan
²Department of Nephrology and Clinical Poison Center, Chang Gung Memorial Hospital and College of Medicine, Chang Gung University, Linkou, Taiwan
³Kidney Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan
⁴Center for Tissue Engineering, Chang Gung Memorial Hospital, Linkou, Taiwan
⁵Division of Endocrinology and Metabolism, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
⁶Faculty of Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan
⁷School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan

Correspondence should be addressed to Aileen I. Tsai; ait001@cgmh.org.tw

Received 12 March 2020; Revised 28 May 2020; Accepted 23 June 2020; Published 20 July 2020

Academic Editor: Ali I. Abdalla

Copyright © 2020 Po-Sen Chang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract.

There are few published studies that report the prevalence of intraoral anomalies for young children. The purpose of this study was to investigate the prevalence and distribution of several congenital oral and paraoral anomalies in Taiwanese children under age six. Twenty-five cities and townships were randomly sampled in different areas of Taiwan using the stratified method. These cities and townships represent cross-sectional samples of geographic locations and socioeconomic levels. A total of 981 Taiwanese children under age six were examined with dental mirrors and explorers as part of the national dental survey. The results of this survey indicated an 11.31% prevalence of geographic tongue. This number is higher than that reported in studies previously performed in different countries. The occurrence of double teeth in primary dentition was found to be 2.14%. Ankyloglossia had a frequency of 1.22%, and primary talon cusp a frequency of 0.61%. Seven (0.71%) children exhibited fissured tongues. Thirteen (1.33%) cases of hypodontia were found. These values were different from those reported in several other countries, which may be attributed to differences in the ethnic and racial composition of the population studied.

1. Introduction

The presence of orodental anomalies is relatively common during routine oral examination. Many epidemiological studies in several countries have reported prevalence values for various orodental anomalies, such as those affecting the tongue, frenum, gingiva, number of teeth, shape of teeth, size of teeth, and even color of teeth [1–89]. Epidemiological studies of orodental anomalies are still lacking in published reports compared with reports regarding dental caries, periodontal diseases, and oral cancer. Dental anomalies of number, shape, and size may occur in primary and permanent dentitions. Most of these reports are representative of oral and paraoral lesions in either adult or schoolchildren populations [18, 20, 21, 28–30]. There have been few publications regarding the occurrence and frequency of certain orodental anomalies in young children.

In addition, most of the studies have focused on non-Asian races [1–6, 8–10, 12, 13, 15–22, 24, 25, 27–35, 37–41, 43, 46, 48, 51, 52, 54–61, 63–69, 71, 73–76, 78–80, 86–89], and many orodental anomalies often have a considerable relationship with race. In understanding the prevalence of orodental anomalies in children in Taiwan, national dental surveys can be studied as a reference for public health planning and activities [13, 33, 59] and as a basis for prevention policies. Huang et al. demonstrated the prevalence of mesiodens in Taiwanese children aged 2.5 and 7 years in a hospital [36]. Liu and Huang investigated the prevalence of oral abnormalities such as palatal cysts and gingival cysts in Taiwanese newborns in a hospital [56]. Chen et al. reported the prevalence of dental anomalies such as hypodontia, hyperdontia, and double teeth in Taiwanese preschool children [72]. As mentioned by Wu et al., the prevalence of double primary teeth in the dental records of Taiwanese children under 17 years old is 0.72% [73].

Selecting a representative sample of infants and toddlers is usually difficult because these children are not readily accessible [90, 91]. Thus, there is a paucity of dental health data from birth to 6 years of age in the Taiwanese population [56, 72] as well as worldwide. The first national dental survey of children younger than the age of 6 in Taiwan, conducted from 1995 to 1997, provides useful orodental health epidemiological data, including caries status and orodental anomalies. Although the execution of this nationwide study was in 1995 to 1997, the prevalence of orodental anomalies usually represents a genetic and racial composition and has a rather stable range of values.

The purpose of this study was to investigate the prevalence and distribution of several congenital oral and paraoral anomalies in Taiwanese children under age six in a nationwide dental survey.

2. Materials and Methods

This cross-sectional descriptive study was conducted from 1995 to 1997. The investigation was approved by the Institutional Review Board of Chang Gung Memorial Hospital (IRB number: 201600095B0C502) and followed the methods described in our previous study [92], including the following:

2.1. Sample Design

There are 309 cities, villages, and townships in Taiwan, according to the Republic of China’s Ministry of the Interior. These geographic locations are divided into 10 administrative strata as follows: (1) developing area, (2) mountainous area, (3) industrial area, (4) hilly area, (5) remote area, (6) service business area, (7) combination area, (8) metropolitan area in Taipei City (northern area of Taiwan), (9) metropolitan area in Kaohsiung City (southern area of Taiwan), and (10) five well-developed county administration centers according to their socioeconomic status (SES) and degree of urbanization.

The sample design in this study was based on the principle of stratification, using multistage sampling with unequal sample probability. We designated the population elements into these 10 strata. All characteristics, such as location, age, and sex, and each population group appeared in our sample. The population of interest in this investigation was Taiwanese children under age 6; children in orphanages were excluded.

2.2. Multistage Sampling

Two-stage sampling was conducted within each stratum to assure random sampling in this survey. In the first stage, the probabilities proportional to sizes (PPS) method was conducted to select districts from 10 strata. In addition, the number of sampling districts for each stratum was proportional to the number of children under age 6 within each stratum. There were 25 districts selected in this study. The second stage was the selection of 15 blocks from each sampled district using cluster sampling. There were 15 geographical neighbor house units within each block. Therefore, each sampled district was composed of 225 (15x15) household samples. In each house sample, children under age 6 were the subjects of this survey.

2.3. Selection of Blocks

The position of each district on the map utilized computer-selected two-dimensional random coordinate points. A valid coordinate point determined the first house unit of a sampling block and contained 15 neighboring house units within a radius of 100 meters.

Maps were a major factor in our survey. However, the most recent and precise distribution of all streets could not be completely depicted by current maps. Hence, in the process of selecting blocks, the position of the first house units was determined by a global positioning system (GPS).

2.4. Selection of House Units and Sampling Objects

Fifteen sampling house units for each sampled block had to be neighbors with each other geographically. That is, sampling house units for each block could not be separated by rivers or main avenues. In addition, companies, schools, and dormitories were excluded from sampling house units.

All children under age 6 living in sampling houses were regarded as sampling objects. Children who were absent from the household during the survey were asked to take the examination on the following day. If the child was not available on the following day, he/she was excluded from the study.

2.5. Order of Interviews

To avoid a seasonal influence on the rate of children available for oral/dental examination, we randomly selected the order of interviews for 25 sampled districts. In addition, visitors were sent to each house in random the sample to introduce the survey and to invite the family to participate in this survey. All eligible people in the house units were interviewed, and a specially designed survey questionnaire was used. If there were children under the age of 6 in the house unit, the child would be scheduled for an oral/dental examination.

A total of 5625 house units were sampled, and 1681 house units had children under the age of 6. A total of 981 children were available for oral/dental examinations using dental mirrors, explorers, disposable tongue depressors, and natural and/or artificial light. Specially designed charts were used to record personal data and oral conditions. Dental radiographs were not taken. The oral/dental examinations were performed by 3 pediatric dentists. Before the survey, the diagnostic criteria and calibration were thoroughly discussed. The examination procedure, instruments used, and diagnostic criteria were based on WHO guidelines [93].

Parental interviews were carried out by trained interviewers. The parent or the caregiver was also asked to complete a questionnaire about their child that provided demographic information, such as the child’s age and sex.

Interexaminer calibration was performed by comparing independent oral/dental examinations of randomly selected children. Calibration studies were carried out in a local kindergarten in which twenty 3- to 5-year-old children were assessed. Values for kappa statistics for the interexaminer agreement were 0.97 and 0.98. These values included caries status and all oral conditions diagnosed.

2.6. Diagnostic Criteria

The following criteria for a positive finding were used to diagnose the selected conditions being investigated.

2.6.1. Tongue

(1)Ankyloglossia (tongue tie) is a thick frenum on the ventral surface of the tongue that does not allow protrusion of the tip of the tongue beyond the vermilion border of the lower lip.(2)Fissured tongues are multiple linear fissures of various depths on the dorsal surface of the tongue.(3)Geographic tongue (benign migratory glossitis) is a patchy area of papillary atrophy with partly sharp demarcations partially surrounded by white lines.(4)Median rhomboid glossitis is a red zone that varies in size with no filiform papillae. This is located on the midline and anterior to the posterior third of the dorsum of the tongue.

2.6.2. Oral Mucosa

(1)Fordyce granules are single or multiple, yellow papules that vary in size, found in the buccal mucosa, unilaterally or bilaterally, and/or the vermilion border of the lip.(2)Gingival cysts are small, elevated, yellow to pink multiple nodules in the neonatal palate and alveolar ridges.

2.6.3. Palate

(1)Torus palatinus is a bony convexity on the palatal surface of the maxilla.

2.6.4. Mandible

(1)Torus mandibularis is a bony convexity on the lingual surface of the body of the mandible.

2.6.5. Teeth

(1)Double teeth are any two teeth partially or completely joined at their crowns or a total or partial division of the crown of a single tooth. No clinical distinction was made between fusion and gemination.(2)Hyperdontia is the number of teeth that exceeds the normal amount in either primary or permanent dentition.(3)Hypodontia is a congenital absence of one or more primary or permanent teeth.(4)Natal teeth are defined as the presence of teeth at birth.(5)Neonatal teeth appear between the first and thirtieth day of life.(6)Peg lateral incisors are maxillary or mandibular lateral incisors that are conical in shape, lacking the normal parallel or flared mesial and distal surfaces.(7)Talon cusp is a form of supernumerary cusp seen on the cingulum portion of the tooth usually extending and protruding to the incisal edges.

2.7. Statistics

The data collected were processed and analyzed using SPSS statistics version 19.0 software (SPSS, Chicago, IL, USA). The chi-square test was used to analyze the association between orodental anomalies and sex. was considered statistically significant.

3. Results

The randomly selected sample of children in this study provided an estimate of the oral condition of the 1.9 million children between the ages of 0 and 6 years in Taiwan.

In this study, 5625 house units were sampled. A total of 1681 house units had children under 6. A total of 981 children were available for oral/dental examination; 526 (53.62%) were boys, and 455 (46.38%) were girls. The sex ratio of 1.16 boys per girl is within the accepted range. The distribution of the age groups of the 981 children is presented in Table 1.

Table 1: The distribution of young children in Taiwan according to age.

Age (year)

0-1
1-2
2-3
3-4
4-5
5-6

No.
114
182
182
178
147
178

Percent
11.62
18.55
18.55
18.14
14.98
18.14

Table 2 shows the orodental anomalies of 981 young children. All the selected entities of anomalies, except hypodontia, appeared to affect both males and females comparably. Hypodontia appeared to be more common in females than in males ().

Table 2: The distribution of orodental anomalies according to sex in young children in Taiwan.

Orodental anomalies
Male (, 53.62%)
Female (, 46.38%)
Total ()
value

%

%

%

Ankyloglossia
7
1.33
5
1.10
12
1.22
0.742

Fissured tongue
5
0.95
2
0.44
7
0.71
0.343

Geographic tongue
59
11.22
52
11.43
111
11.31
0.917

Gingival cyst
1
0.19
1
0.22
2
0.20
0.918

Double teeth
9
1.71
12
2.64
21
2.14
0.317

Hyperdontia
1
0.19
0
0
1
0.10
0.352

Hypodontia
3
0.57
10
2.20
13
1.33
0.026

Peg lateral incisor
1
0.19
1
0.22
2
0.20
0.918

Talon cusp
3
0.57
3
0.66
6
0.61
0.858

Statistically significant, according to sex ().

Table 3 shows the cases with double teeth, hyperdontia, hypodontia, and talon cusp. Seven of the 22 double teeth cases occurred between the mandibular right cuspid and lateral incisor. The second most frequent incidence of double teeth occurred at the mandibular left central and lateral incisor. Three out of 9 talon cusps occurred on the left maxillary central incisors.

Table 3: The distribution of teeth affected by double teeth, hyperdontia, hypodontia, and talon cusp.

Double teeth
Hyperdontia
Hypodontia
Talon cusp

Tooth
No. of teeth affected
Tooth
No. of teeth affected
Tooth
No. of teeth affected
Tooth
No. of teeth affected

61-62
3
72
1
52
3
51
2

71-72
5

62
2
53
1

72-73
4

72
2
61
3

81-82
3

73
4
62
1

82-83
7

82
5
63
2

83
4

Total
22

1

20

9

There was only one child who had a supernumerary tooth and it was visible without radiography. The most common congenitally absent primary tooth was the right mandibular lateral incisor.

None of the following anomalies or conditions was found: median rhomboid glossitis, Fordyce granules, torus palatinus, or torus mandibularis. There was one child who was reported to have a natal tooth. However, that natal tooth was not seen at the time of this study.

The prevalence values of orodental anomalies in young children from various published sources are summarized in Table 4. The previously reported numbers were also compared with those of the present study for the conditions studied.

Table 4

(a) Previous prevalence studies of orodental anomalies in young children

First author
Country
Sample size
Age group
Ankyloglossia
Fissured tongue
Geographic tongue
Gingival cyst

Rahamimoff, 1957 [9]
Israel
5425
0-2
—
—
14.29
—

Moller, 1963 [13]
Iceland
609
2-7
—
—
0.16
—

Ghose, 1982 [26]
Iraq
859
6
—
0.93
3.61
—

Jorgenson, 1982 [27]
USA
2164
Neonate
1.80
—
—
43.72

Friend, 1990 [34]
USA
500
Neonate
4.4
—
—
25.0

Flinck, 1994 [38]
Sweden
1021
Neonate
2.45
—
—
21.94

Bezerra, 2000 [45]
Brazil
1042
0-5
—
—
0.48
0.86

Messner, 2000 [46]
USA
1041
Neonate
4.8
—
—
—

Baldani, 2001 [49]
Brazil
200
0-2
—
—
5.0
—

Ballard, 2002 [51]
USA
3036
Neonate
4.18
—
—
—

Vörös-Balog, 2003 [54]
Hungary
159
1-5
—
18.23
6.92
—

Bessa, 2004 [55]
Brazil
746
0-4
0.67
0.54
9.92
1.34

Liu, 2004 [56]
Taiwan
420
Neonate
—
—
—
79

Hogan, 2005 [57]
UK
1866
Neonate
10.77
—
—
—

Ricke, 2005 [60]
USA
3490
Neonate
4.24
—
—
—

Paula, 2006 [62]
Brazil
561
Neonate
—
—
—
28.16

Freudenberger, 2008 [67]
Mexico
2182
Neonate
10.6
—
—
96.9

George, 2008 [68]
India
1038
Neonate
—
—
—
13.78

Çetinkaya, 2011 [74]
Turkey
2021
Neonate
0.3
—
—
15.19

Monteagudo, 2012 [79]
Spain
1000
Neonate
—
—
—
13.4

Vieira-Andrade, 2013 [81]
Brazil
541
0-5
—
0.55
2.77
—

Kumar, 2017 [85]
India
25786
Neonate
0.52
—
—
—

Perez-Aguirre, 2018 [87]
Mexico
2216
Neonate
1.49
—
—
79

de Oliverira, 2019 [88]
Brazil
400
Neonate
9.0
—
—
23.0

Present study
Taiwan
981
0-6
1.22
0.71
11.31
0.20

(b) Previous prevalence studies of orodental anomalies in young children (continued)

First author
Country
Sample size
Age group
Double teeth
Hyperdontia
Hypodontia
Peg lateral incisor
Talon cusp

Plaetschke, 1938 [3]
Poland
1000

0.5
0.2
0.7
—
—

Tinn, 1940 [4]
UK
8500

0.3
—
—
—
—

Leighton, 1953 [6]
UK
2700

—
0.8
0.9
—
—

Menczer, 1955 [7]
USA
2209

0.14
0.25
0.1
—
—

Clayton, 1956 [8]
USA
1795
3-5
0.8
1.8
4.6
—
—

Saito, 1959 [10]
Japan
7589

4.5
—
0.2
—
—

Grahnén, 1961 [11]
Sweden
1173

0.5
0.3
0.4
—
—

Moller, 1963 [13]
Iceland
609
2-7
0.16
0.82
0.16
—
—

Niswander, 1963 [14]
Japan
285

2.46
—
—
—
—

Turobova, 1965 [15]
USSR
3520

0.7
—
—
—
—

Curzon, 1967 [16]
Canada
776

0.9
0.6
0
—
—

Toth, 1967 [17]
Germany
2539

0.6
—
—
—
—

Ravn, 1971 [19]
Denmark
4564
3
0.85
0.55
0.55
—
—

Brook, 1974 [20]
UK
741

1.6
0.8
0.3
—
—

Holm, 1974 [22]
Sweden
208
3
0.5
1.4
0.5
—
—

Rasmussen, 1975 [23]
Denmark
406

—
1.7
0.2
—
—

Järvinen, 1980 [24]
Finland
1141
3-4
0.70
—
—
—
—

Järvinen, 1981 [25]
Finland
1141
3-4
—
0.44
0.88
—
—

Magnússon, 1984 [30]
Iceland
572
0-7
0.70
0.5
0.5
—
—

Skrinjarić, 1991 [35]
Croatia
2987
3-6
0.43
0.10
0.47
—
—

Jones, 1993 [37]
USA
493
3-4
0.41
0.20
0
—
—

Ooshima, 1996 [40]
Japan
905
3-6
—
—
—
1.2
0.6

Whittington, 1996 [41]
New Zealand
1680
5
0.83
0.18
0.35
—
—

Yonezu, 1997 [42]
Japan
2733
3
4.10
0.07
2.38
0.55
—

Carvalho, 1998 [43]
Belgium
750
3-5
0.67
0.80
0.42
—
—

Aguiló, 1999 [44]
Spain
6000

0.8
—
—
—
—

Miyoshi, 2000 [47]
Japan
8122
3-6
—
0.05
—
—
—

Bäckman, 2001 [48]
Sweden
739
7
—
—
—
0.8
—

Tasa, 2001 [50]
India
412
6
1.46
—
—
—
—

Cheng, 2003 [53]
China
4286
2-6
1.52
—
—
—
—

King, 2008 [69]
Hong Kong, China
936
5
4.06
2.78
4.06
—
0.53

Kramer, 2008 [70]
Brazil
1260
2-5
1.27
0.32
0.63
—
—

Chen, 2010 [72]
Taiwan
2611
2-6
2.91
0.27
1.80
—
—

Kapdan, 2012 [77]
Turkey
1149
2-5
1.31
0.26
0.17
—
—

Mukhopadhyay, 2014 [82]
Bangladesh
2757
4-6
0.40
0.40
0.51
—
0.07

Deolia, 2015 [83]
India
1398
2-5
2.36
0.36
0.64
—
—

Lochib, 2015 [84]
India
1000
3-5
0.5
—
0.4
—
—

Shilpa, 2017 [86]
India
4180
3.5-6
0.95
0.21
0.88
—
0.04

Folayan, 2019 [89]
Nigeria
918
3-5
0.44
1.20
0.87
1.20
0.65

Present study
Taiwan
981
0-6
2.14
0.10
1.33
0.20
0.61

Primary dentition.

4. Discussion

This is the first national survey of orodental anomalies of Taiwanese children under age 6. The data were derived from a nationwide investigation of oral health from 1995 to 1997. The data used for analysis were derived from our previous caries investigation study [92]. The estimated caries prevalence ranged from 5% to 89% across different age groups based on 981 children. The 981 samples might be sufficient for caries investigation according to the calculated sample recommendation from a prevalence study by Pourhoseingholi et al. [94]. The sample size was 1825 if the prevalence was as low as 5%. Thus, we might need more samples for some rare disease investigations in the current study. Although our samples are quite consistent with the population distribution indicated in the 1995 national census, the estimated prevalence for some diseases due to an insufficient sample size might suggest bias, creating a limitation. Therefore, a more current survey should be conducted for more updated information.

4.1. Fissured Tongue

In the present study, we found 7 children (0.71%) with this condition. Chosack et al. and Halperin and coworkers reported a steady rise in the prevalence of fissured tongue that increases with age [5, 21]. Our number is lower than those previously reported [28, 31, 33, 54], which can possibly be attributed to age and ethnic factors.

4.2. Geographic Tongue

Prevalence reports for this condition have varied in the literature from 0.16% to 14.29%, depending on the population studied. Redman stated that geographic tongue was more common in females [18]. Prinz reported a 5 : 3 female to male ratio [1]; however, neither the number of subjects involved nor the method of selection was explained. Our observations found this condition to be equally frequent in both sexes, with overall prevalence values of 11%. The findings of Turpin and Caratzali suggest that geographic tongue is more common in children [2]. Mani also reported that geographic tongue maintained a lower prevalence rate in older age groups [32]. Redman suggested that the peak age for this condition was 2 to 3 years of age [18]. This may explain the higher prevalence value of this condition in our study because the population studied was children aged 0 to 6 years. Togo reported very high rates of occurrence of this condition among Japanese children (up to 8%) [12]. Rahamimoff and Muhsam studied Israeli children and reported a rate of 14% [9]. Thus, these high rates suggest that this condition may be due to ethnic factors.

There was one observation of a child with a combination of both fissured tongue and geographic tongue.

4.3. Gingival Cyst

Two infants, a one-month-old boy and a 10-month-old girl, were identified. Usually, cysts are transient and degenerate early in infancy. In this survey, there were 114 children under age one. Therefore, gingival cysts were represented in 2 out of 114 infants (1.75%).

This study included a population of children aged 0-6 years. Some of them did not have any teeth. The abnormalities of their dentition are discussed below.

4.4. Double Teeth

Double teeth were seen in nine (1.71%) boys and twelve (2.64%) girls, with an average of 2.14% for both sexes combined. The sex difference was statistically insignificant. Our findings show a higher prevalence for double teeth than those in previous reports [8, 13, 19, 24, 30, 35, 41]. Ethnic and genetic composition may account for this disparity. Clayton stated that fused teeth were more commonly found in the 3-5 year age group and were equally distributed between males and females [8]. However, Sedano et al. and Buenviaje and Rapp reported that fused teeth were more common among males [29, 33]. This study and previous reports in the literature [8, 13, 30] indicate that double teeth were usually observed in the incisor-canine area of either jaw.

4.5. Hypodontia

The frequency of hypodontia in our study was 1.33%. The present study shows a higher prevalence with greater predilection towards females (). Most of the missing teeth involved lateral incisors [8, 19, 25, 42, 72]. Our study confirms that the teeth most commonly missing were mandibular lateral incisors [42, 72].

4.6. Hyperdontia and Peg Lateral Incisor

In the present study, both conditions had low prevalence values. However, since dental radiographs of this population were not taken, some unerupted supernumerary teeth may have remained undiscovered. Two peg lateral incisors occurred on the mandible. Our 0.2% prevalence for primary peg lateral incisors is similar to the frequency reported by Clayton [8].

4.7. Talon Cusp

Talon cusp has been reported in both permanent and primary dentitions [39]. This anomaly occurred three times more often in permanent dentition than in primary dentition [39]. To date, more than 100 cases of talon cusps on the primary incisors of normal children have been reported in the literature [58, 61, 63–66, 71, 75, 76, 78, 80]. Our present study found 6 children (3 boys and 3 girls) with a total of 9 talon cusps.

The developmental anomalies of primary teeth may affect esthetic and dental caries along the fusion fissures, periodontal problems, delayed or ectopic eruption of the permanent successors, and orthodontic problems. Early detection of these orodental anomalies contributes to dental treatment planning and precludes any of the adverse effects of these abnormalities on permanent dentition.

The data derived from the nationwide survey can be used not only in clinical dental practice but also in future anthropologic or genetic research.

5. Conclusions

In conclusion, the most common orodental anomaly among young children in Taiwan in this survey was geographic tongue (11.31%). The next most common anomalies and rates were double teeth, 2.07%, and hypodontia, 1.28%. These data provide a useful reference for the prevalence of orodental anomalies and can be used as a basis for public health planning activities.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors have declared that they have no conflicts of interest exist.

Acknowledgments

The study was supported by Grant DOH-86-HP001-3M01, Taiwan.

References

H. Prinz, “Wandering rash of the tongue (geographic tongue),” Dental Cosmos, vol. 69, pp. 272–275, 1927.

R. Turpin and A. Caratzali, “Contribution à l'étiologie de la glossite exfoliatrice marginée,” La Presse Médicale, vol. 64, pp. 1273-1274, 1936.

J. Plaetschke, “Okklusionsanomalien im milchgebiss,” Dtsch Zahn, Mund-u Kieferheilk, vol. 5, p. 435, 1938.

C. A. Tinn, “Excess, deficiency and gemination in the deciduous and permanent dentition of school children,” British Dental Journal, vol. 68, no. 6, pp. 236–238, 1940.

V. Halperin, S. Kolas, K. R. Jefferis, S. O. Huddleston, and H. B. G. Robinson, “The occurrence of Fordyce spots, benign migratory glossitis, median rhomboid glossitis, and fissured tongue in 2,478 dental patients,” Oral Surgery, Oral Medicine, Oral Pathology, vol. 6, no. 9, pp. 1072–1077, 1953.

B. C. Leighton, “Some abnormalities of the deciduous dentition,” The Dental Record, vol. 43, pp. 395–401, 1953.

L. Menzer, “Anomalies of the primary dentition,” Journal of Dentistry for Children, vol. 22, pp. 57–62, 1955.

J. M. Clayton, “Congenital dental anomalies occurring in 3,557 children,” Journal of Dentistry for Children, vol. 23, pp. 206–208, 1956.

P. Rahamimoff and H. Muhsam, “Some Observations on 1246 Cases of Geographic TongueThe Association Between Geographic Tongue, Seborrheic Dermatitis, and Spasmodic Bronchitis—Transition of Geographic Tongue to Fissured Tongue,” A.M.A. Journal of Diseases of Children, vol. 93, no. 5, pp. 519–525, 1957.

T. Saito, “A genetic study on the degenerative anomalies of deciduous teeth,” The Japanese Journal of Human Genetics, vol. 4, pp. 27–53, 1959.

H. Grahnen, “Numerical variations in primary dentition and their correlation with the permanent dentition,” Odont Revy, vol. 12, pp. 348–357, 1961.

T. Togo, “Clinical study on geographic tongue,” The Kurume Medical Journal, vol. 24, pp. 1156–1172, 1961.

P. Moller, “Oral health survey of preschool children in Iceland,” Acta Odontologica Scandinavica, vol. 21, no. 1, pp. 47–97, 1963.

J. D. Niswander and C. Sujaku, “Congenital anomalies of teeth in Japanese children,” American Journal of Physical Anthropology, vol. 21, no. 4, pp. 569–574, 1963.

G. Turobova, “K voprosu ob anomalii formy molochnykh zubov,” Stomatologiya, vol. 44, pp. 86–88, 1965.

J. Curzon and M. Curzon, “Congenital dental anomalies in a group of British Columbia children,” Journal of the Canadian Dental Association, vol. 33, no. 10, pp. 554–558, 1967.

A. Toth, “Zwillingszahne im Milchgebiss,” Dtsch Zahnarztl Z, vol. 22, pp. 546–554, 1967.

R. S. Redman, “Prevalence of geographic tongue, fissured tongue, median rhomboid glossitis, and hairy tongue among 3,611 Minnesota schoolchildren,” Oral Surgery, Oral Medicine, Oral Pathology, vol. 30, no. 3, pp. 390–395, 1970.

J. Ravn, “Aplasia, supernumerary teeth and fused teeth in the primary dentition: an epidemiologic study,” European Journal of Oral Sciences, vol. 79, no. 1, pp. 1–6, 1971.

A. H. Brook, “Dental anomalies of number, form and size: their prevalence in British schoolchildren,” Journal of the International Association of Dentistry for Children, vol. 5, no. 2, pp. 37–53, 1974.

A. Chosack, D. Zadik, and E. Eidelman, “The prevalence of scrotal tongue and geographic tongue in 70,359 Israeli schoolchildren,” Community Dentistry and Oral Epidemiology, vol. 2, no. 5, pp. 253–257, 1974.

A. Holm and S. Arvidsson, “Oral health in preschool Swedish children. 1. Three-year-old children,” Odontologisk Revy, vol. 25, no. 1, pp. 81–98, 1974.

I. Rasmussen and S. Helm, “Occurrence of malocclusion in the primary dentition,” Tandlaegebladet, vol. 79, no. 10, pp. 383–388, 1975.

S. Järvinen, L. Lehtinen, and A. Milen, “Epidemiologic study of joined primary teeth in Finnish children,” Community Dentistry and Oral Epidemiology, vol. 8, no. 4, pp. 201-202, 1980.

S. Järvinen and L. Lehtinen, “Supernumerary and congenitally missing primary teeth in Finnish Children,” Acta Odontologica Scandinavica, vol. 39, no. 2, pp. 83–86, 1981.

L. J. Ghose and V. S. Baghdady, “Prevalence of geographic and plicated tongue in 6090 Iraqi schoolchildren,” Community Dentistry and Oral Epidemiology, vol. 10, no. 4, pp. 214–216, 1982.

R. J. Jorgenson, S. D. Shapiro, C. F. Salinas, and L. S. Levin, “Intraoral findings and anomalies in neonates,” Pediatrics, vol. 69, no. 5, pp. 577–582, 1982.

A. Kullaa-Mikkonen, M. Mikkonen, and R. Kotilainen, “Prevalence of different morphologic forms of the human tongue in young Finns,” Oral Surgery, Oral Medicine, Oral Pathology, vol. 53, no. 2, pp. 152–156, 1982.

T. Buenviaje and R. Rapp, “Dental anomalies in children: a clinical and radiographic survey,” ASDC Journal of Dentistry for Children, vol. 51, no. 1, pp. 42–46, 1984.

T. E. Magnússon, “Hypodontia, hyperodontia, and double formation of primary teeth in Iceland: an epidemiological study,” Acta Odontologica Scandinavica, vol. 42, no. 3, pp. 137–139, 1984.

D. R. Sawyer, E. O. Taiwo, and A. Mosadomi, “Oral anomalies in Nigerian children,” Community Dentistry and Oral Epidemiology, vol. 12, no. 4, pp. 269–273, 1984.

N. Mani, “Occurrence of fissured tongue, geographic tongue and filiform atrophy among dental patients in Saudi Arabia,” Annals of Dentistry, vol. 44, no. 2, pp. 14–16, 1985.

H. O. Sedano, I. C. Freyre, M. L. G. De la Garza et al., “Clinical orodental abnormalities in Mexican children,” Oral Surgery, Oral Medicine, Oral Pathology, vol. 68, no. 3, pp. 300–311, 1989.

G. W. Friend, E. F. Harris, H. H. Mincer, T. L. Fong, and K. R. Carruth, “Oral anomalies in the neonate, by race and gender, in an urban setting,” Pediatric Dentistry, vol. 12, no. 3, pp. 157–161, 1990.

I. Škrinjarić and V. Barac-Furtinović, “Anomalies of deciduous teeth and findings in permanent dentition,” Acta Stomatologica Croatica, vol. 25, no. 3, pp. 151–156, 1991.

W. Huang, T. Tsai, and H. Su, “Mesiodens in the primary dentition stage: a radiographic study,” ASDC Journal of Dentistry for Children, vol. 59, no. 3, pp. 186–189, 1992.

M. Jones, A. Mourino, and T. Bowden, “Evaluation of occlusion, trauma, and dental anomalies in African-American children of metropolitan Headstart programs,” The Journal of Clinical Pediatric Dentistry, vol. 18, no. 1, pp. 51–54, 1993.

A. Flinck, A. Paludan, L. Matsson, A.-K. Holm, and I. Axelsson, “Oral findings in a group of newborn Swedish children,” International Journal of Paediatric Dentistry, vol. 4, no. 2, pp. 67–73, 1994.

F. Hattab, “Talon cusp in permanent dentition associated with other dental anomalies: review of literature and reports of seven cases,” Journal of Dentistry for Children, vol. 6, pp. 368–376, 1996.

T. Ooshima, R. Ishida, K. Mishima, and S. Sobue, “The prevalence of developmental anomalies of teeth and their association with tooth size in the primary and permanent dentitions of 1650 Japanese children,” International Journal of Paediatric Dentistry, vol. 6, no. 2, pp. 87–94, 1996.

B. Whittington and C. Durward, “Survey of anomalies in primary teeth and their correlation with the permanent dentition,” The New Zealand Dental Journal, vol. 92, no. 407, pp. 4–8, 1996.

T. Yonezu, Y. Hayashi, J. Sasaki, and Y. Machida, “Prevalence of congenital dental anomalies of the deciduous dentition in Japanese children,” The Bulletin of Tokyo Dental College, vol. 38, no. 1, pp. 27–32, 1997.

J. C. Carvalho, F. Vinker, and D. Declerck, “Malocclusion, dental injuries and dental anomalies in the primary dentition of Belgian children,” International Journal of Paediatric Dentistry, vol. 8, no. 2, pp. 137–141, 1998.

L. Aguiló, J. L. Gandia, R. Cibrian, and M. Catala, “Primary double teeth. A retrospective clinical study of their morphological characteristics and associated anomalies,” International Journal of Paediatric Dentistry, vol. 9, no. 3, pp. 175–183, 1999.

S. Bezerra and I. Costa, “Oral conditions in children from birth to 5 years: the findings of a children's dental program,” Journal of Clinical Pediatric Dentistry, vol. 25, no. 1, pp. 79–81, 2000.

A. H. Messner, M. L. Lalakea, J. Aby, J. Macmahon, and E. Bair, “Ankyloglossia,” Archives of Otolaryngology–Head & Neck Surgery, vol. 126, no. 1, pp. 36–39, 2000.

S. Miyoshi, S. Tanaka, H. Kunimatsu, Y. Murakami, M. Fukami, and S. Fujisawa, “An epidemiological study of supernumerary primary teeth in Japanese children: a review of racial differences in the prevalence,” Oral Diseases, vol. 6, no. 2, pp. 99–102, 2000.

B. Bäckman and Y. B. Wahlin, “Variations in number and morphology of permanent teeth in 7-year-old Swedish children,” International Journal of Paediatric Dentistry, vol. 11, no. 1, pp. 11–17, 2001.

M. H. Baldani, C. M. D. L. Lopes, and W. A. Scheidt, “Prevalence of oral alterations in infants seen at the public pediatric dental clinics from Ponta Grossa - PR, Brazil,” Pesquisa Odontológica Brasileira, vol. 15, no. 4, pp. 302–307, 2001.

G. L. Tasa and J. R. Lukacs, “The prevalence and expression of primary double teeth in western India,” Journal of Dentistry for Children, vol. 68, no. 3, pp. 196–200, 2001.

J. L. Ballard, C. E. Auer, and J. C. Khoury, “Ankyloglossia: assessment, incidence, and effect of frenuloplasty on the breastfeeding dyad,” Pediatrics, vol. 110, no. 5, pp. e63–e63, 2002.

N. Avcu and A. Kanli, “The prevalence of tongue lesions in 5150 Turkish dental outpatients,” Oral Diseases, vol. 9, no. 4, pp. 188–195, 2003.

R. Cheng, X. Chen, S. J. Liu, L. Pan, and X. G. Wu, “An epidemiological survey on fusion of deciduous teeth of 4286 kindergarten children in Shenyang City,” Shanghai Journal of Stomatology, vol. 12, no. 6, pp. 424–426, 2003.

T. Vörös-Balog, N. Vincze, and J. Banoczy, “Prevalence of tongue lesions in Hungarian children,” Oral Diseases, vol. 9, no. 2, pp. 84–87, 2003.

C. F. N. Bessa, P. J. B. Santos, M. C. F. Aguiar, and M. A. V. do Carmo, “Prevalence of oral mucosal alterations in children from 0 to 12 years old,” Journal of Oral Pathology & Medicine, vol. 33, no. 1, pp. 17–22, 2004.

M.-H. Liu and W.-H. Huang, “Oral abnormalities in Taiwanese newborns,” Journal of Dentistry for Children, vol. 71, no. 2, pp. 118–120, 2004.

M. Hogan, C. Westcott, and M. Griffiths, “Randomized, controlled trial of division of tongue-tie in infants with feeding problems,” Journal of Paediatrics and Child Health, vol. 41, no. 5-6, pp. 246–250, 2005.

S. Mays, “Talon cusp in a primary lateral incisor from a medieval child,” International Journal of Paediatric Dentistry, vol. 15, no. 1, pp. 67–72, 2005.

G. Mumcu, H. Cimilli, H. Sur, O. Hayran, and T. Atalay, “Prevalence and distribution of oral lesions: a cross-sectional study in Turkey,” Oral Diseases, vol. 11, no. 2, pp. 81–87, 2005.

L. A. Ricke, N. J. Baker, D. J. Madlon-Kay, and T. A. DeFor, “Newborn tongue-tie: prevalence and effect on breast-feeding,” The Journal of the American Board of Family Practice, vol. 18, no. 1, pp. 1–7, 2005.

C.-k. Lee, N. King, E. Lo, and S.-y. Cho, “Talon cusp in the primary dentition: literature review and report of three rare cases,” Journal of Clinical Pediatric Dentistry, vol. 30, no. 4, pp. 299–305, 2006.

J. Paula, C. C. Dezan, W. T. Frossard, L. R. Walter, and L. M. Pinto, “Oral and facial inclusion cysts in newborns,” Journal of Clinical Pediatric Dentistry, vol. 31, no. 2, pp. 127–129, 2006.

C.-K. Lee, N. M. King, E. C.-M. Lo, and S.-Y. Cho, “The relationship between a primary maxillary incisor with a talon cusp and the permanent successor: a study of 57 cases,” International Journal of Paediatric Dentistry, vol. 17, no. 3, pp. 178–185, 2007.

O. Tulunoglu, D. Cankala, and R. Ozdemir, “Talon's cusp: report of four unusual cases,” Journal of Indian Society of Pedodontics and Preventive Dentistry, vol. 25, no. 1, pp. 52–55, 2007.

R. K. Yoon and S. Chussid, “Dental management of a talon cusp on a primary incisor,” Pediatric Dentistry, vol. 29, no. 1, pp. 51–55, 2007.

L. Young, E. Mass, L. Beni, M. Weinreb, and A. D. Vardimon, “Enamel, dentine and pulp in talon primary maxillary central incisors: a histomorphometric study,” European Archives of Paediatric Dentistry, vol. 8, no. 3, pp. 136–140, 2007.

S. Freudenberger, M. A. Santos Díaz, J. M. Bravo, and H. O. Sedano, “Intraoral findings and other developmental conditions in Mexican neonates,” Journal of Dentistry for Children, vol. 75, no. 3, pp. 280–286, 2008.

D. George, S. S. Bhat, and S. K. Hegde, “Oral findings in newborn children in and around Mangalore, Karnataka State, India,” Medical Principles and Practice, vol. 17, no. 5, pp. 385–389, 2008.

N. King, S. Tongkoom, A. Itthagarun, H. M. Wong, and C. K. Lee, “A catalogue of anomalies and traits of the primary dentition of southern Chinese,” Journal of Clinical Pediatric Dentistry, vol. 32, no. 2, pp. 139–146, 2008.

P. F. Kramer, C. A. Feldens, S. H. Ferreira, M. H. Spiguel, and E. G. Feldens, “Dental anomalies and associated factors in 2- to 5-year-old Brazilian children,” International Journal of Paediatric Dentistry, vol. 18, no. 6, pp. 434–440, 2008.

C.-K. Lee, N. M. King, E. C. Lo, and S. Y. Cho, “Management of supplemental permanent maxillary lateral incisors in association with talon cusp on the primary predecessors: a report of 3 cases,” Journal of Dentistry for Children, vol. 75, no. 1, pp. 59–63, 2008.

Y.-H. Chen, N. C. Cheng, Y. B. Wang, and C. Y. Yang, “Prevalence of congenital dental anomalies in the primary dentition in Taiwan,” Pediatric Dentistry, vol. 32, no. 7, pp. 525–529, 2010.

C.-W. Wu, Y.-T. Lin, and Y.-T. Lin, “Double primary teeth in children under 17 years old and their correlation with permanent successors,” Chang Gung Medical Journal, vol. 33, no. 2, pp. 188–193, 2010.

M. Çetinkaya, F. T. Öz, A. I. Orhan et al., “Prevalence of oral abnormalities in a Turkish newborn population,” International Dental Journal, vol. 61, no. 2, pp. 90–100, 2011.

A. Kapur, A. Goyal, and S. Bhatia, “Talon cusp in a primary incisor: a rare entity,” Journal of Indian Society of Pedodontics and Preventive Dentistry, vol. 29, no. 3, pp. 248–250, 2011.

R. N. Bahadure, N. Thosar, and E. S. Jain, “Management of Talons Cusp associated with Primary Central Incisor: A Rare Case Report,” International Journal of Clinical Pediatric Dentistry, vol. 5, no. 2, pp. 142–144, 2012.

A. Kapdan, A. Kustarci, B. Buldur, D. Arslan, and A. Kapdan, “Dental anomalies in the primary dentition of Turkish children,” European Journal of Dentistry, vol. 6, no. 2, pp. 178–183, 2012.

S. Kavitha, H. Selvakumar, and R. Barathan, “Mandibular talon cusp in primary lateral incisor: a rare case report,” Case Reports in Dentistry, vol. 2012, Article ID 670745, 3 pages, 2012.

B. Monteagudo, J. Labandeira, M. Cabanillas, A. Acevedo, E. León-Muiños, and J. Toribio, “Prevalence of milia and palatal and gingival cysts in Spanish newborns,” Pediatric Dermatology, vol. 29, no. 3, pp. 301–305, 2012.

S. Mallineni, N. M. Manan, C. K. Lee, and N. M. King, “Talon cusp affecting primary dentition in two siblings: a case report,” Romanian Journal of Morphology and Embryology, vol. 54, no. 1, pp. 211–213, 2013.

R. G. Vieira-Andrade, P. A. Martins-Júnior, P. Corrêa-Faria et al., “Oral mucosal conditions in preschool children of low socioeconomic status: prevalence and determinant factors,” European Journal of Pediatrics, vol. 172, no. 5, pp. 675–681, 2013.

S. Mukhopadhyay and S. Mitra, “Anomalies in primary dentition: Their distribution and correlation with permanent dentition,” Journal of Natural Science, Biology, and Medicine, vol. 5, no. 1, pp. 139–143, 2014.

S. G. Deolia, C. Chhabra, K. G. Chhabra, S. Kalghatgi, and N. Khandelwal, “Dental anomalies of the deciduous dentition among Indian children: A survey from Jodhpur, Rajasthan, India,” Journal of Indian Society of Pedodontics and Preventive Dentistry, vol. 33, no. 2, pp. 111–115, 2015.

S. Lochib, K. R. Indushekar, B. G. Saraf, N. Sheoran, and D. Sardana, “Occlusal characteristics and prevalence of associated dental anomalies in the primary dentition,” Journal of Epidemiology and Global Health, vol. 5, no. 2, pp. 151–157, 2015.

R. K. Kumar, P. C. N. Prabha, P. Kumar, R. Patterson, and N. Nagar, “Ankyloglossia in infancy: An Indian experience,” Indian Pediatrics, vol. 54, no. 2, pp. 125–127, 2017.

G. Shilpa, N. Gokhale, S. K. Mallineni, and S. Nuvvula, “Prevalence of dental anomalies in deciduous dentition and its association with succedaneous dentition: A cross-sectional study of 4180 South Indian children,” Journal of Indian Society of Pedodontics and Preventive Dentistry, vol. 35, no. 1, pp. 56–62, 2017.

B. Perez-Aguirre, U. Soto-Barreras, J. P. Loyola-Rodriguez et al., “Oral findings and its association with prenatal and perinatal factors in newborns,” Korean Journal of Pediatrics, vol. 61, no. 9, pp. 279–284, 2018.

A. J. De Oliveira, D. A. Duarte, and M. B. Diniz, “Oral anomalies in newborns: an observational cross-sectional study,” Journal of Dentistry for Children, vol. 86, no. 2, pp. 75–80, 2019.

M. O. Folayan, M. Alade, A. Adeniyi, M. El Tantawi, and T. L. Finlayson, “Association between developmental dental anomalies, early childhood caries and oral hygiene status of 3–5-year-old children in Ile-Ife, Nigeria,” BMC Oral Health, vol. 20, no. 1, 2020.

L. W. Ripa, “Nursing caries: a comprehensive review,” Pediatric Dentistry, vol. 10, no. 4, pp. 268–282, 1988.

W. K. Seow, A. Amaratunge, R. Sim, and A. Wan, “Prevalence of caries in urban Australian aborigines aged 1-3.5 years,” Pediatric Dentistry, vol. 21, no. 2, pp. 91–96, 1999.

A. I. Tsai, C. Y. Chen, L. A. Li, C. L. Hsiang, and K. H. Hsu, “Risk indicators for early childhood caries in Taiwan,” Community Dentistry and Oral Epidemiology, vol. 34, no. 6, pp. 437–445, 2006.

World Health Organization, Oral Health Surveys: Basic Methods, World Health Organization, Geneva, Switzerland, 3rd edition, 1987.

M. A. Pourhoseingholi, M. Vahedi, and M. Rahimzadeh, “Sample size calculation in medical studies,” Gastroenterol Hepatol Bed Bench, vol. 6, no. 1, pp. 14–17, 2013.