慢性牙周炎单侧上颌第2磨牙伸长患者牙合接触特征的研究

A study on characters of occlusal contacts of periodontitis patients with unilateral hyper- erupted maxillary second molar

目的：研究慢性牙周炎单侧上颌第2磨牙伸长患者的牙合接触特征。方法：针对30例慢性牙周炎下牙合第2磨牙缺失的患者，应用T－ScanⅢ咬合分析仪对单侧上颌第2磨牙伸长患者进行牙尖交错位、前伸及侧方运动的咬合记录，并与正常组咬合记录的结果作对照。结果：单侧上颌第2磨牙伸长组的牙合力中心距中线距离与正常对照组差异有统计学意义；单侧上颌第2磨牙伸长组的闭合时间、牙合分离时间与正常对照组相比较，差异均有统计学意义。早接触、牙合干扰出现率与慢性牙周病单侧上颌第2磨牙伸长存在相关性。结论：慢性牙周炎会加速无对颌牙的伸长，并且有加重牙合干扰的情况发生。

Objective：To investigate the characters of occlusal contacts of periodontitis patients with unilateral hyper-erupted maxillary Second molar.Methods：30 with unilateral hyper-erupted maxillary second molars as test groups.The occlusal contact characters of 30 cases with unilateral hyper-erupted maxillary second molar were all measured with T-ScanⅢsystem in the intercuspal occlusal position.Results：（1） The statistical analysis showed the movement of center of force between the patients with unilateral hyper-erupted maxillary second molars group and the control group was statiscally different.（2）The statistical analysis showed the clusion times and the disclusion times between the patients with unilateral hyper-erupted maxillaty second molars group and the control group were statiscally different.（3） By statistical analysis, the premature contact occurrence rate and the occlusal interference occurrence rate were related with the unilateral hyper-erupted maxillary second molar.Conclusion：Chronic periodontitis may accelerate the elongation of the corrosive jaw teeth, and there might be increasing tooth interference happens.