Objective: To determine the magnitude of soft tissue changes in subjects with different facial patterns following Class II correction.
Materials/Methods: A retrospective sample of 80 subjects exhibiting Class II malocclusions was used. Subjects were categorized into facial types according to pre-treatment values of MPA and Y-axis, which yielded 20 brachycephalic, 40 mesocephalic, and 20 dolichocephalic subjects. Data collection included digital analysis on the pre-treatment (T0) and post-treatment (T1) cephalometric radiographs. A paired t-test statistic was used to investigate the differences between the three facial groups at T0 and T1.
Conclusions: There are differences in the soft tissue effects observed in patients treated with the XbowTM appliance which are related to the pre-existing facial pattern (p<0.05): The mesocephalic group showed increased retrusion of the upper lip to E-Plane compared with brachycephalic, and dolichocephalic groups. The dolichocephalic group showed significantly more flattening of the mentolabial fold compared to the mesocephalic group.
| Identifer | oai:union.ndltd.org:MANITOBA/oai:mspace.lib.umanitoba.ca:1993/30607 |
| Date | 06 July 2015 |
| Creators | Ward, Robert |
| Contributors | Wiltshire, William (Preventive Dental Science), Drummond, Robert (Preventive Dental Science) Birek, Catalena (Oral Biology) |
| Source Sets | University of Manitoba Canada |
| Detected Language | English |
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