Document Type : Original Article


1 Assistant professor of Orthodontics, Faculty of Dentistry, Birjand University of Medical Sciences, Birjand, Iran

2 Post graduate student, Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran

3 Undergraduate Student of Dentistry, Faculty of Dentistry, Birjand University of Medical Sciences, Birjand, Iran



Background: There is a continuous debate on the issue of comparison between extraction and non-extraction treatment results in terms of subsequent soft tissue changes for Class II division 1 patients. So far, however, far too little attention has been paid to photographic evaluation of treatment results.
Aims: The aim of this was to assess the impact of extraction and non-extraction treatment of Class II division 1malocclusion on soft tissue profile by means of pre- and post- treatment photographs.
Materials and methods: The pre- and post- treatment profile photographs of 41 borderline Class II division 1malocclusion 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 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.
Conclusions: The results of this study for both extraction and non- extraction group were straightening and improvement of soft tissue profile without significant impact on lips or nasolabial angle.


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