The soft tissue profile analysis of class II malocclusion in the early permanent dentition :a cephalometric study

Objective: To analyze the soft tissue profile characteristic in the early permanent dentition with Class I malocclusion, furthermore, to choose several soft tissue variables as the indexes for assessing esthetics of facial profile and reveal the relationship between hard and soft tissue.Method: 50 normal occlusion and 50 Class Ⅱ malocclusion children were examined cephalometrially with the lip at rest.Result: Compared with the normal occlusion group, All measurement except 3 soft tissue variables and 2 hard tissue variables was statisticallysignificant with t-test in the Class Ⅱ malocclusion group (P0.05). Five indexes were selected through discriminant analysis. Pearson correlation analyses showed there was correlation between the hard tissue variables and the facial balance indexes.Conclusion: B'Li-FH, NsLs-FH, LiNsPg', Li-E and CmSnLs were selected as five indexes which may represent the abnormality of facial profile of Class Ⅱ malocclusion. The soft tissue profile will be harmonious by the treatment of inharmonious hard tissue.