应用T-scan Ⅲ系统对楔状缺损患牙(牙合)接触的研究

摘要

Objective To measure the occlusion of teeth with wedge-shaped defects and explore the correlation.Methods Following examination from 32 patients,32 teeth which were the only teeth with wedge-shaped defect in single quadrant were regarded as the ex-periment group.Also,34 teeth with no such non-cariouscervical lesions were regarded as the control group.Routine clinical examination method and the t-scanⅢsystem were used to check the distribution of premature contacts(PC)on the subject teeth,and the t-scan Ⅲ system was used to take a dynamic,quantitative analysis for occlusal contact in centric occlusion,lateral occlusion and protrusion of subject teeth.Results The proportion of the teeth with premature contact(PC)in working side in wedge-shaped defect teeth from two experiment groups(75.0％,70.0％)was much higher than that in their corresponding control teeth(17.7％,18.2％)(P<0.05).In working side,the percentages of occlusal force and the occlusal contact strain of wedge-shaped defect teeth were significantly higher than the control teeth(P<0.05).Conclusion Dysfunction occlusal force has relation with the progression of wedge-shaped de-fects occurring on single teeth.%目的 测量楔状缺损患牙的(牙合)接触,探究(牙合)因素与楔状缺损形成的关系.方法 从32例受检者中选取32颗口内单象限内单颗楔状缺损患牙和34颗同名未患楔状缺损牙分别作为实验组和对照组.应用直接9(牙合)接触测量法及T-scan Ⅲ系统分析受检牙(牙合)干扰的分布,并应用T-scan Ⅲ系统对受检牙在正中(牙合)、侧方(牙合)及前伸(牙合)运动中的(牙合)接触进行动态、定量测量.结果 实验组中单侧组与双侧组患牙的工作侧(牙合)干扰牙数百分比(75.0％、70.0％)均高于各自对照牙(17.7％、18.2％),差异有统计学意义(P<0.05);在侧方(牙合)工作侧运动中,实验组患牙所分担的(牙合)力及其咬合高点上(牙合)接触强度均高于对照牙,差异有统计学意义(P<0.05).结论 口内单象限内单颗牙楔状缺损的发生与(牙合)干扰及(牙合)力负担过重有关.