A photographic analysis of soft tissue changes following Class II Division 1 malocclusion treatment with and without extraction

There is a continuous debate on the issue of comparison between extraction and non-extraction treatment results in terms of subsequent soft tissue changes in class ii division 1 patients. so far, however, little attention has been paid to the photographic evaluation of treatment results. the aim of this study was to assess the impact of extraction and non-extraction treatment of class ii division 1 malocclusion on soft tissue profile by means of pre- and post- treatment photographs methods: the pre- and post- treatment profile photographs of 41 borderline class ii division 1 malocclusion patients (anb ≤5 degrees, and overjet ≤ 5 mm) were evaluated. the photographs were digitized into the computer and 19 angular measurements were evaluated. paired t-tests and independent-sample t-tests were performed to compare the pre- and post- treatment values between the extraction and non- extraction groups. the level of significance was set to be p < .05. results: significant differences between pre- and post- treatment values in extraction group existed for z angle and n‑sn‑pog. in non-extraction group, significant differences were observed in n‑pn‑pog, g‑sn‑pog, n‑sn‑pog and n‑sn‑b. when comparing the extraction and non-extraction groups before and after treatment, the results showed that the only significant difference was in pfh/afh proportion. conclusion: the results of this study revealed that for both extraction and non-extraction groups, there were straightening and improvement of soft tissue profile without significant impact on lips or nasolabial angle.