A three-dimensional soft tissue analysis of Class III malocclusion: a case-controlled cross-sectional study
Journal of Orthodontics
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Objective: Thus, the objective of the present study was to use the optical surface laser scanning technique to compare the facial features of patients aged 8-18 years presenting with Class I and Class III incisor relationship in a case-control design. Materials and methods: Subjects with a Class III incisor relationship, aged 8-18 years that met the selection criteria were prospectively recruited to this cross-sectional case-control study. Age and gender matched controls, with a Class I incisor relationship were used. All subjects underwent a 3-dimensional (3-D) optical surface scan of the facial soft tissues. Surface scans were then compared quantitatively, applying both landmark measurements and surface-based analysis by the creation of a Class III and Class I facial shell, providing a shell-to-shell ‘deviation’ map. Results: Landmark analysis revealed Class III subjects displayed greater mean dimensions compared to the control group most notably between the ages of 8-10 and 17-18 years in both males and females, in respect of antero-posterior (p=0.01) and vertical (p=0.006) facial dimensions. With regards to the surface-based analysis, Class III shells revealed the greatest difference was in the lower facial region, followed by the mid-face, whilst the upper face remained fairly consistent but did not reach statistical significance. Conclusion: The present study demonstrates significant detectable differences in the surface facial features of developing class III subjects, when applying 3-D optical surface scanning, with the added advantages of being non-invasive and non-irradiating technique. Key words: Soft tissues, Class III, Optical surface scanning.
AuthorsJOHAL, A; Chagger, A; Zou, LF
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