3D soft tissue effects of rapid palatal expansion
Torres, Diana M.
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This retrospective cohort study investigated the effects of rapid maxillary expansion on the soft tissues using CBCTs. The sample consisted of 60 subjects: experimental group (n=30, treated with rapid maxillary expansion (RME), age:10.93 ± 2.20) and control group (n=30, age 11.43 ± 2.8). Soft tissue measurements were made using soft tissue landmarks. Paired t-test was used to compare the changes after expansion, and student t-test was used to compare the experimental and the control group. Intraclass correlation coefficient was used to evaluate intra-examiner reliability. Statistically significant differences were noted when comparing the experimental to the control group in transverse and anterior posterior dimensions. Increase was noted at the bialar distance (0.90mm, p=0.0363), nostril medium left to midsagittal plane (0.75mm, p=0.0423), the angle of pronasale to nostril base right and left (1.640, p<.001), columella width (0.56mm, p=0.0272), nostril base left to midsagittal plane, (1.03mm, p=0.0207), chelion right to endocanthus right (1.57mm, p=0.0086), chelion left to endocanthus left (1.96mm, p=0.0015). Anteroposteriorly, the tip of the nose moved forward (pronasale to coronal plane (1.97mm, p=0.0018), nostril medium right to coronal plane (1.07mm, p=0.0486), alare right to coronal plane (1.67mm, p=0.0117), pronasale to nostril base left (2.24mm, p<0.001) and right (2.12mm, p<0.001). Finally comparing genders, all the measurements were significantly greater in males compared to females except for columella width. In conclusion, RME influences soft tissue changes of the face, specifically in the nasal area. The base of the nose, bialar distance and columella widened while the tip of the nose moved forward.