Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
Oral and maxillofacial radiologyOnline only articleCharacteristics of 283 supernumerary teeth in southern Chinese children
Section snippets
Methods
The records of 382 children who had visited the Paediatric Dentistry Clinic of the University of Hong Kong, between 1980 and 2006 were identified. The sample was based on walk-in patients and referrals from government hospitals and private medical and dental practitioners. The diagnosis of a supernumerary tooth was made during clinical and/or radiographic examinations. All of the 382 subjects were southern Chinese who lived in Hong Kong. Subjects with poor-quality radiographs, incomplete
Results
Of the 208 children who were included in the final analysis, 157 (75.5%) were males and 51 (24.5%) were females. The mean age at the time that the supernumerary teeth were identified was 7.3 ± 2.7 years, with a minimum of 2.1 years and a maximum of 15.2 years, while the mean age for the surgical removal or extraction of the supernumerary teeth was 8.1 ± 2.7 years, with a minimum of 4.1 years and a maximum of 15.8 years (Table I). One hundred and forty-six (70.2%) of the 208 children were in the
Discussion
Males were more frequently affected than females in the ratio 3.1:1. This ratio is higher than the previously reported ratios for Caucasian populations10, 11, 31 yet lower than the 6.5:1 and 5.4:1 ratios reported for Hong Kong children.13, 32 The variations in the gender ratios can be attributed to racial variation, and to possible sampling differences. Interestingly, most of the patients (80.4%) in this study were in the mixed (70.2%) or primary dentitions (20.2%) at the time of diagnosis, a
Conclusion
Consistent with previous studies, the findings of the present study revealed that most supernumerary teeth were conical, occurred in the premaxillary region, assumed an inverted orientation, and remained unerupted.
References (42)
- et al.
Familial occurrence of mesiodens
Oral Surg Oral Med Oral Pathol
(1969) Mesiodens in primary and permanent dentition
Oral Surg Oral Med Oral Pathol
(1975)A unifying aetiological explanation for anomalies of human tooth number and size
Arch Oral Biol
(1984)- et al.
Cleidocranial dysplasia: a light microscopic electron microscope, and crystallographic study
Oral Surg Oral Med Oral Pathol
(1989) Orthodontics, an historical review
(1926)- et al.
A textbook of oral pathology
- et al.
Classification and genetics of numeric anomalies of dentition
Birth Defects Orig Artic Ser
(1983) - et al.
Supernumerary teeth in the permanent dentition
Odontolo Revy
(1961) Anterior supernumerary teeth-assessment and surgical intervention in children
Pediatr Dent
(1981)- et al.
Impacted supernumerary teeth: a survey of 50 cases
J Am Dent Assoc
(1983)