Department of Orthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
Orthod Craniofac Res. 2010 Nov;13(4):246-54. doi: 10.1111/j.1601-6343.2010.01501.x.
To assess the effects of varying force direction of maxillary orthopedic protraction on mandibular condylar position.
The conventional facemask group (Group 1) comprised 22 patients, 11 girls, and 11 boys (mean age: 9.3 ± 1.3 years); the modified facemask group (Group 2) comprised 22 patients, 12 girls, and 10 boys (mean age: 9.4 ± 1.5 years); and the control group (Group 3) comprised 21 subjects, 11 girls, and 10 boys (mean age: 9.8 ± 1.9 years). Changes in mandibular position indicator (MPI ®) measurements of the SAM ® 3 articulator were evaluated. Treatment and control changes within groups and between groups were analyzed statistically. Intra-group comparisons were tested with the non-parametric Wilcoxon's test and inter-group changes with Kruskal-Wallis. The statistical significance of inter-group differences was further assessed with the Mann-Whitney test for independent samples with Bonferroni's correction.
Antero-posterior positional changes of the left condyle were found higher in the controls than in Group 1 (p<0.016). Superior-inferior positional changes of the left condyle were also found significantly higher in controls than in Group 2 (p<0.016). No other significant changes in condylar position were determined in either group. In the treatment groups, asymmetrical condylar position diminished and became symmetrical with treatment in the antero-posterior direction (Group 1: 13.64%, Group 2: 36.37%) plane. In controls, the antero-posterior change of asymmetry was smaller (antero-posterior change: 7.60%).
These findings generally suggest that modified and conventional facemask therapy with expansion had no adverse effects on the temporomandibular and masticatory system.
评估上颌骨矫形牵引时不同力方向对下颌髁突位置的影响。
传统面弓组（第 1 组）包括 22 名患者，11 名女孩和 11 名男孩（平均年龄：9.3 ± 1.3 岁）；改良面弓组（第 2 组）包括 22 名患者，12 名女孩和 10 名男孩（平均年龄：9.4 ± 1.5 岁）；对照组（第 3 组）包括 21 名受试者，11 名女孩和 10 名男孩（平均年龄：9.8 ± 1.9 岁）。评估了 SAM®3 颌架下颌位置指示物（MPI®）测量值的变化。对组内和组间的治疗和对照变化进行了统计学分析。组内比较采用非参数 Wilcoxon 检验，组间变化采用 Kruskal-Wallis 检验。采用独立样本 Mann-Whitney 检验和 Bonferroni 校正进一步评估组间差异的统计学意义。
左侧髁突的前-后位置变化在对照组中高于第 1 组（p<0.016）。左侧髁突的上-下位置变化在对照组中也明显高于第 2 组（p<0.016）。在任何一组中都没有发现其他明显的髁突位置变化。在治疗组中，随着治疗的进行，前-后方向的不对称性髁突位置减小并变得对称（第 1 组：13.64%，第 2 组：36.37%）。在对照组中，不对称的前-后变化较小（前-后变化：7.60%）。
这些发现表明，改良和传统的面弓扩张治疗对面颌和咀嚼系统没有不良影响。
