The purpose of this study was to estimate the frequency of and describe the clinical characteristics and complications of patients with nonsyndromic multiple mandibular supernumerary premolars.
Patients and Methods
Among 110,500 patients seen between July 2003 and January 2007, 32 cases of multiple (2 or more) mandibular supernumerary premolars were found. Data including age, gender, number, distribution, and location of supernumerary premolars, extraction procedure, and related complications (such as cystic changes, root resorption, or adjacent teeth eruption disturbance) were collected.
Results
Six of 32 patients were female; the male to female ratio was 4.3:1. Prevalence of non-syndromic multiple mandibular supernumerary premolars was 0.029%. Mean age was 17.8 years. Root resorption of an adjacent tooth was found in 1 patient. Eruption anomalies were found in 5 patients and included impaction of a permanent tooth, prolonged retention of a deciduous tooth, and displacement of an adjacent tooth. Supernumerary teeth locations were predominantly lingual except for 4 teeth.
Conclusion
Prevalence found in this study was lower compared with previous studies. However, the rate of related complications was higher, even though the mean age was relatively low. Surgical intervention should be considered to prevent unwanted sequelae for any signs of complication.
⁎Graduate Student, Department of Pediatric Dentistry, School of Dentistry, Seoul National University, Seoul, Korea.
†Resident, Department of Pediatric Dentistry, Seoul National University Dental Hospital, Seoul, Korea.
‡Resident, Department of Pediatric Dentistry, Seoul National University Dental Hospital, Seoul, Korea.
§Professor, Department of Cell and Developmental Biology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
‖Associate Professor, Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
¶Associate Professor, Department of Oral and Maxillofacial Surgery and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
#Associate Professor, Departments of Pediatric Dentistry and Dental Research Institute and Cell and Developmental Biology, School of Dentistry, Seoul National University, Seoul, Korea.
Address correspondence and reprint requests to Dr Jung-Wook Kim: Department of Cell and Developmental Biology, Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, 275-1 Yongon-dong, Chongno-gu, Seoul 110-768, Korea
This study was supported by a grant from the Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea (A060010), and the Korea Science and Engineering Foundation (KOSEF) through the Biotechnology R&D program (#2006-05229).
ABSTRACT