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  • Title: [A survey of number and morphology anomalies in permanent teeth of 6 453 youths between 17 to 21 years old].
    Author: Wu H, Feng HL.
    Journal: Zhonghua Kou Qiang Yi Xue Za Zhi; 2005 Nov; 40(6):489-90. PubMed ID: 16329836.
    Abstract:
    OBJECTIVE: To investigate the status of number and morphology anomalies in the permanent teeth. METHODS: A survey of anomalies of number and morphology in the permanent teeth was carried out in 6 453 students who were 17 to 21 years old in 3 colleges during 2002 to 2004. Chi-square test was used to analyze the sex distribution, the involved tooth types and the associated anomalies. RESULTS: The overall prevalence of dental number and morphology anomalies was 16.07%. The prevalence rates of peg-shape (conical) tooth, dens evaginatus and hypodontia were higher in females compared to males (P < 0.05). Dens evaginatus and peg-shape teeth often involved maxillary lateral incisors, Dens evaginatus often involved mandibular second premolars. Fused teeth and hypodontia often involved mandibular incisors. The prevalence of hypodontia coincident with peg-shaped teeth was higher than other associated anomalies (P < 0.01). CONCLUSIONS: The result was similar to other investigations, but peg-shape teeth and dens evaginatus were more prevalent in females than in males.
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