Smile Asymmetry in Patients treated with combined Orthodontics and Orthognathic Surgery


  • Sofia Martins Private Dental Office, Luxembourg



Lip Canting, Smile Extent, Orthognathic Surgery, Facial Landmark Points


AIM: The aim of this study was to examine the relationship between lip canting and the extent of a smile, both pre- and post-operatively, in patients who were treated with combined orthodontics and orthognathic surgery. 
METHODS: This study included 90 clinical photographs of 45 patients smiling, both before and after orthognathic surgery. Facial landmark points were traced to compare pre- and post-operative photographs. The data were used to measure the vertical distance of the lips when smiling – lip elevation and the extent of a smile, both before and after surgery. The correlations among canting, the type of surgery, and Angle class were evaluated by a one-way analysis of variance (ANOVA) and multiple comparisons using the Tamhane post hoc test. 
RESULTS: The magnitude of the post-operative extent of a smile was not significantly correlated with lip elevation and changes in lip canting. There were no statistical differences for Angle class I and asymmetric cases, in contrast to Class II and III results regarding the extent of a smile post-operatively. Bimaxillary surgery resulted in significantly broader smiles, and bilateral sagittal split osteotomy resulted in higher lip elevation post-operatively, though not to a significant extent. 
CONCLUSION: Soft tissues, particularly the smiling lip line, are affected by orthognathic surgery and skeletal malocclusion. However, further studies will be needed to better assess and study smile dynamics.




How to Cite

Martins, S. (2024). Smile Asymmetry in Patients treated with combined Orthodontics and Orthognathic Surgery. Archive of Orofacial Data Science, 1(1).
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