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Abstract

Objective: To retrospectively investigate the prevalence and patterns of tooth agenesis in permanent dentition of bilateral cleft lip and palate (BCLP) children in Southern Taiwan. Patients: 156 Taiwan children (99 males and 57 females) with BCLP aged from 4 to18 years were selected from the craniofacial records between July, 1983 and June, 2008 in the Department of Orthodontics, Kaohsiung Chang Gung Memorial Hospital. Materials and methods: Dental records including the panoramic radiographs, periapical films of anterior teeth, upper occlusal films and dental models of the selected patients were examined. Results: The prevalence of tooth agenesis of permanent dentition is 78.8%. The most common missing teeth arranged in order are maxillary lateral incisor, maxillary second premolar, mandibular second premolar, maxillary canine and mandibular lateral incisor. There is no obvious difference in prevalence between both sides in individual arch. Twenty eight agenesis patterns are revealed in this study. The three most common types are missing maxillary bilateral lateral incisors (36.5%), maxillary left lateral incisor (9%) and maxillary right lateral incisor (5.1%). The contribution of gender difference in agenesis pattern reveals male dominant tendency in each pattern, except the group with missing maxillary right lateral incisor. Conclusion: Extreme variations exist in the prevalence and patterns of tooth agenesis in permanent dentition of BCLP patients in this study. The tooth agenesis pattern of permanent dentition seems to be affected by multiple factors. The results of this study show that the missing rate of each tooth and agenesis pattern in permanent dentition tend to be influenced by racial factor and the gender difference does not play an important role.

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