The Effects Of Occlusion Force On The Generation And Treatment Result Of Wedge-Shaped Defect

Objective:To discuss the relationship between the occlusion force and the pathogenesis of wedge-shaped defect (non-carious cervical lesion, NCL) and the influence of occlusion adjustment on the treatment effect and prognosis of wedge-shaped defect. Methods:The occlusion forces of the wedge-shaped defect teeth and control teeth (the same teeth on the oppsite side of the same dental arch with no defects) were measured using T-Scan II occlusion analysing system. The correlations between the occlusion forces and the degree of wedge-shaped defect were analysed. Then the wedge-shaped defect teeth were filled regularly and divided into two groups randomly: occlusion adjustment group and control group. The restorations were evaluated using modified USPHS system immediately after treatment and 6 months later. Each index was examined and recorded and the results were analysed statistically. Results :The occlusion forces of wedge-shaped defect teeth are heavier than the control teeth and statistically significant difference was found. The tooth wear index was positively correlated to the occlusion force(r=0. 6807). But there was no correlation botween the tooth wear index and age. Statistically significant differences were observed between two groups for the retention of the restoration at six months after treatment(P<0. 05). But no significant difference was found for the other evaluated categories. The success rate of restoration in occlusion adjustment group was higher than the control group. Conclusions:The occlusion forces of wedge-shaped defect teeth are statistically heavier than the control teeth. The degree of the lesion was positively correlated to the occlusion force. The occlusion force played an important role on formation of the wedge-shaped defect. Occlusion adjustment may elevate the success rate of wedge-shaped defect restoration. The role of occlusion adjustment should be maximized during the treatment of wedge-shaped defect.