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Dimensions and Post-Treatment Changes of Anterior Dentoalveolar Bone in Female Orthodontic Patients with Different Vertical Skeletal Patterns
並列摘要
Objective: To determine the maxillary and mandibular anterior dentoalveolar bone width, height and length (MxAW, MdAW, MxAH, MdAH, MxAL, and MdAL) in Thai female patients with skeletal open bite, normal bite and deep bite and to compare the differences in these dimensions after fixed orthodontic treatment. Materials and Methods: A total of 116 pairs of pre-orthodontic treatment (T1) and post-orthodontic treatment (T2) lateral cephalograms of female patients (mean age 19.16 years) were selected systematically from the department database and digitized using a customized cephalometric software program (Dentofacial planner version 5.32). Analysis of variance (ANOVA) and Scheffe's test were used to assess the differences among vertical skeletal groups at the 95% level of confidence (P＜0.05). To determine the differences between pre-treatment and post-treatment dimensions, paired t-test was performed. Results: Significant differences were found among vertical skeletal groups in all anterior dentoalveolar dimensions (P＜.05). MxAW and MdAW in open bite group were significantly smaller than those of normal bite and deep bite groups but MxAH, MxAL, MdAH and MdAL of open bite group were significantly longer than those of other groups. However, Scheffe's test indicated no significant difference in dimensions between normal bite and deep bite groups (p＞.05). All post-treatment dimensions, except MxAH, significantly decreased in open bite group, but only MxAL, MdAH and MdAL decreased significantly in deep bite group after treatment. Conclusion: All anterior dentoalveolar dimensions were significantly different among skeletal vertical groups. The anterior dentoalveolar dimensions were significantly decreased after orthodontic treatment in all vertical groups, except MxAH.