前牙原发性牙根吸收患者功能的特点分析

A preliminary study on the functional occlusion characters of the patients who had essential root resorption in anterior teeth

目的:探讨原发性牙根吸收患者的功能特点,揭示功能对前牙牙根吸收的影响。方法:对正畸治疗前的错患者用曲面断层片、根尖片并结合临床确诊前牙原发性牙根吸收,从中选取2～3级牙根吸收患者15例,按年龄和性别配对,建立无牙根吸收对照组。对2组实验对象的功能进行临床和Denar MarkⅡ架检查,比较2组在侧方及前伸运动过程中功能指标的差别,采用SPSS13.0软件包进行统计学处理。结果:侧方运动时,实验组前牙干扰的数量显著高于对照组,临床检查(P<0.05)及架检查(P<0.05)均有统计学意义,后牙干扰数量2组无显著差异。下颌后退位(RCP)滑向牙尖交错位(ICP)时在垂直向、前后向及侧向的距离及前伸运动时存在的后牙干扰数2组无显著差异。结论:侧方运动中出现的前牙干扰作为一种长期轻微的创伤,可能是诱发前牙原发性牙根吸收的原因之一。

PURPOSE： In order to determine the effect of functionl occlusion on the essential root resorption, we compared the characters of functional occlusion between the patients who had essential root resorption in anterior teeth and who didn’t have. METHODS： Panoramic radiography, periapical films and clinical data were used to diagnose the essential root resorption before the patients received orthodontic treatment. Fifteen patients who had 2 -3 degree root resorption were divided into the experimental group, while 15 patients who didn’t have were chosen as control group according to their age and sex. The functional occlusion of the cases in the experimental group and control group was checked on Denar Mark Ⅱ articulator and via clinical examination, and the indexes of functional occlusion during protrusive and lateral movement in two groups were recorded. SPSS 13.0 software package was used for statistical analysis. RESULTS： The results showed that the number of anterior teeth occlusal interferences during lateral movement in the experimental group was more than that in control group by clinical （P0.05）or articulator examination （P0.05）,but the number of posterior teeth occlusal interferences didn’t have significant difference between the two groups. There was no significant difference in the retrusive range （RCP-ICP） in vertical, anterior-posterior and lateral direction respectively. CONCLUSION： It is suggested that as a kind of long-standing and minor trauma, the anterior teeth occlusal interferences during lateral movement might be a cause of essential root resorption in anterior teeth.