84例错患者矫治前后咀嚼效率的对比研究

Compared investigation of Masticatory Efficiency of 84 subjects through orthodontic treatment

对84例恒牙期错患者矫治前后咀嚼效率进行测定，其统计结果显示：全部病例矫治后比矫治前的咀嚼效率有显著改善（P＜0．01）。矫治前后男女性别比较两组咀嚼效率均无显著性差异（P＞0．05）。Ⅰ类错矫治前后咀嚼效率无显著性意义（P＞0．05）；Ⅱ、Ⅲ类错及个别前牙反矫治后咀嚼效率均有显著性提高。拔牙组矫治前后咀嚼效率无显著性差异（P＞0．05）；不拔牙组矫治后咀嚼效率则有显著性提高（P＜0．01）。

In this study, 84 patients who were malocclusion of permanent dentition were involved,masticatory efficiency of pre - treatment and post - treatment were determined. Astatistical analysis showed that for all subjects, the masticatory efficiency of post -treatment was better than that of pretreatment. (P<0. 01) No significant difference was found between male group and female group, in either pre-treatment and pose -treatment (P>0. 05). In Angle Class Ⅰ group,no significant change wasfound ; in Angle Class Ⅱ group, masticatory efficiency of post -treatment increased significantly and the same results were showed in Angle Clall Ⅲ group and in individual anterior crossbite group. In tooth extraction group, there was no significant difference between pre-treatment and post-treatment (P>0. 05). In nonextraction group, masticatory efficiency of pose-treatment increased significantly.