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《Journal of Clinical Stomatology》 2014-10
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Hypodontia and correlation analysis between it with peg-shaped teeth or supernumerary teeth in 800 cases of orthodontic patients

CHEN Piao-yang;YE Lu-ping;Department of Stomatology,Wuhan the Eighth Hospital;Department of Orthodontics,Stomatology Hospital of Dalian;  
Objective:The purpose of this study was to evaluate the prevalence and distribution of hypodontia/supernumerary teeth/peg-shaped teeth and the correlation with them. Method:the random cases of 800 orthodontic patients(260males,540 females)between 12 to 40 Yrs. By observing the plaster cast and panoramic x-ray,the prevalence and distribution of hypodontia/supernumerary teeth/peg-shaped teeth or too-small teeth were statisticalled.Investigate the correlation between each dental anomaly and hypodontia by the relevance of classification variables,using the independence chi-aquare test,and describe the degree of correlation with Pearson contingency coefficient. Result:There are 100 cases of hypodontia in the 800 cases,The prevalence of hypodontia was 12.5 %. the frequently missing tooth were the mandibular lateral incisor,the mandibular second premolar,the mandibular middle incisor,the maxillary lateral incisor,the maxillary second premolar decrease progressively. the prevalence of supernumerary teeth was 3.1 %,the prevalence of peg-shaped teeth was 8.3 %.Statistically significant correlations were found between peg-shaped teeth and hypodontia,Pearson contingency coefficient are0.173. Conclusion:The prevalence of hypodontia was 12.5 %. The most frequently mossing tooth is the mandibular lateral incisor and the mandibular second premolar.There were the correlations between the incidence of peg-shaped teeth and hypodontia.
【CateGory Index】: R783.5
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