RESUMEN
Objective To measure Bolton index with malocclusions in Shanghai Fengxian district,and ana-lyze the distinction among different malocclusions patients in respect of gengder,age,and different Angle classifica-tion.Methods Measure Bolton index of plaster models of 348 eligible malocclusions patients who were selected ran-domly from Shanghai Fengxian District,and divided them into different groups by gender,age and Angle classification. Then,Bolton overall ratio and Bolton anterior ratio among these groups were analyzed and compared.Results The results showed that there were no significant differences of Bolton analysis in respect of gender or age(all P >0.05). It exsisted obvious differences in anterior ratios among the three Angle malocclusion class(P <0.05).Bolton anterior ratios were (79.88 ±3.15)%,(78.91 ±2.86)% and (80.59 ±1.55)%,mean of Class I and mean of ClassⅢwere bigger than that of Class Ⅱ.Bolton overall ratios of Angle class Ⅰ,classⅡ and class Ⅲ were (79.88 ± 3.15)%,(79.88 ±3.15)% and (79.88 ±3.15)%,and there were no obvious differences in overall ratios among them.Conclusion Bolton index with malocclusions for Shanghai Fengxian District accord with normol Bolton index of our country.Gender and age are not the influencing factors of Bolton index in Fengxian District.Bloton index anomalies are the important fator in malocclusions.We should pay more attention to the Bolton analysis of class Ⅱ malocclusions in clinical practice,and draw up a treatment plan combined with specific classification.