成人骨性安氏Ⅲ类错患者正畸治疗前后咀嚼效能的变化

Changes in mastication efficiency before and after orthodontic treatment of adult skeletal Angle Ⅲ malocclusion

目的研究骨性安氏Ⅲ类错患者正畸治疗前后的咀嚼效能的变化,并探讨其影响因素。方法选择骨性安氏Ⅲ类错、已正畸治疗及未治疗的患者各30例,年龄18～25岁。以硬化明胶作咀嚼测试物,利用吸光度法测定咀嚼效能。另选30例正常牙合作为对照。结合临床所见,对测定结果进行多元回归分析。结果⑴3组间咀嚼效能差别有统计学意义(P<0.001)。两两比较发现,正常组与错已治疗组、未治疗组差别有显著性(P<0.05),成人骨性安氏Ⅲ类错已治疗组、未治疗组比较,咀嚼效能差别有显著性(P<0.05)。(2)多元回归分析提示,磨牙反牙合、下颌前突等因素与咀嚼效能有显著相关性。结论正畸治疗能够在改善成人骨性安氏Ⅲ类错患者颜面美观的同时,提高其咀嚼效能。

PURPOSE： To evaluate the changes of mastication efficiency pre- and post-treatment in adult skeletal Angle Ⅲ malocclusion, and to analyze the effect of malocclusion on mastication efficiency. METHODS： Masticatory efficiency was analyzed in 60 patients with adult skeletal Angle Ⅲ malocclusion pre- or post-orthodontic treatment and 30 adults with normal occlusion as controls. Masticatory efficiency was measured by means of a spectrophotometer using Gelatin. SPSS 10.0 software package was used for Student＇s t test and step-wise regression. RESULTS： ① Significant difference of masticatory efficiency was found among the three groups （P〈0.001）. Multiple comparision showed significant difference among pre-treatment group, post-treatment group and normal controls （P〈0.05）. ② Step-wise regression results suggest that overjet and mandibular prognathism were closely related to masticatory efficiency in both pre- and post-treatment group. CONCLUSION： Orthodontic therapy can improve masticatory function in patients with malocclusion.