Bolton Analysis of Different Malocclusion

Objective To investigate the incidence of Bolton ratios in different malocclusion groups. Method The mesiodistal width of six anterior teeth and twelve teeth size were assessed in 325 patients who were selected randomly. These dental casts were divided into three groups according to angle classification .Bolton ratios and the incidence of Bolton tooth size discrepancies were calculated and statistical differences were estimated. Result Bolton anterior and overall ratios of Class Ⅲ and Class Ⅰ were more than that of Class Ⅱ respectively. While Bolton anterior and overall tooth size discrepancies showed Class Ⅰ ClassⅡClass Ⅲ(P0.05). Conclusion Significant difference can be found in both Bolton index and the incidence of Bolton tooth size discrepancies in different malocclusion groups.It suggests that the Bolton analysis should be carried out before treatment.