青少年错[牙合]畸形正畸后牙尖交错位[牙合]接触特征初探

Occlusal contacts in intercuspal position after orthodontic treatment

目的通过了解青少年错[牙合]畸形正畸后牙尖交错位的[牙合]接触特征，从功能角度对正畸效果进行评价。方法选择14例经正畸治疗获得正常牙列形态的青少年错[牙合]畸形患者作为病例组，17名性别、年龄与病例组匹配的正常[牙合]健康人作为健康对照组，使用T-ScanⅡ咬合分析系统记录两组牙尖交错位的[牙合]接触特征并进行比较。结果在1／10、1／4、1／2、3／4最大[牙合]力页面及最大[牙合]力页面上病例组前牙[牙合]接触点数目的中位数（四分位数间距）分别为1．5（1．0）、3．0（1．3）、4．5（3．3）、5．5（3．0）及5．5（3．3）个，显著大于健康对照组[分别为0．0（0．3）、0．0（0．6）、0．3（0．5）、0．3（1．0）及0．0（1．8）个，P〈0．05]；各页面上病例组后牙[牙合]接触面积与健康对照组的差异无统计学意义（P〉0．05）；与健康对照组相比，病例组[牙合]力中心点明显偏近中。病例组牙尖交错位建[牙合]时间的中位数（四分位数间距）为0．192（0．141）s，略大于健康对照组[0．163（0．200）s]，但两组差异无统计学意义（P〉0．05）。结论与正常[牙合]健康人相比，青少年错[牙合]畸形患者正畸后其前牙承受胎力明显偏大。

Objective To observe the occlusal contacts in intercuspal position（ICP） in adolescent patients after orthodontic treatment. Methods Fourteen adolescent patients after orthodontic treatment were selected as experimental group and 17 healthy adolescents and young adults with normal occlusion were selected as control group. The occlusal contact in ICP in the two groups were recorded with T-Scan Ⅱ system and compared. Results When the total of force（TOF） were 1/10 TOFmax, 1/4 TOFmax, 1/2 TOFmax, 3/4 TOFmax and TOFmax, the number of occlusal contacts in the anterior segment in the experimental group were 1.5 （ 1.0）, 3.0 （ 1.3 ）, 4. 5 （ 3. 3 ）, 5.5 （ 3. 0 ）, 5.5 （ 3. 3 ）, which were significantly larger than that in control group[0. 0（0.3）, 0.0（0.6）, 0.3（0.5）, 0.3（1.0）, 0.0（1.8）, P〈0.05]. There were no significant difference in the area of occlusal contacts in the posterior segment between experimental group and control group（ P 〉0. 05 ）. The center of force （COF） in the experimental group located significantly more mesially than that in control group. The value of ICP contact time in experimental group was 0. 192（0. 141 ） s and no significant difference was found between experimental group and control group [0. 163 （0. 200 ） s ]. Conclusions Although the patiants achieved normal occlusion after orthodontic treatment, their anterior teeth received more occlusal force than those in healthy adolescents and young adults with normal occlusion.