Abstract: Objective To observe anterior and overall Bolton Indexes of different Angle classifications.Methods 1 276 adolescent models were collected.After measurements,anterior and overall Bolton Indexes were calculated,and comparisons among different Angle classifications were made.Results Both anterior and overall Bolton Indexes of male and female Angle Class Ⅲ were significantly higher than that of male and female Angle Class I.Anterior Bolton Index of male Angle Class Ⅱ Division 1 was significantly lower than that of male Angle Class I.And anterior Bolton Indexes of female Angle Class Ⅱ Division 1 and Division 2 were both significantly lower than those of female Angle Class I.Conclusions Differences existed among Bolton Indexes of different Angle classifications.

Key words: Angle Class Ⅰ, Angle Class Ⅱ, Angle Class Ⅲ, Bolton Index