不同刷牙压力对牙齿楔形缺损影响的体外研究

摘要

AIM:To evaluate the toothbrushing force on dentine abrasion and on wedge-shaped defect formation.METHODS:40 dentine specimens for wear test were prepared from human premolars,the specimens were divided into 5 groups(n =8) and brushed in a V-type dental wear testing machine for 10 000-times under a loading of 90 g(F90),110 g (F110),130 g(F130),150 g(F150) and 170 g(F170) respectively.Then the abrasion depth,abrasion volume and roughness average(Ra) of each specimen were measured using a three-dimensional optical profilometer.RESUITS:The abrasion depth ranked as follows:F90 ＜ F110 ＜ F130 ＜ F150 ＜ F170(P ＜ 0.01);the abrasion volume ranked as follows:F90 ＜ F110 ＜ F130 ＜ F150 ＜ F170 (P ＜ 0.01);Ra ranked as follows:F90 ＜ F110 ＜ F130 ＜ F150 ＜F170(P ＜0.01).There was a correlation between Ra with the abrasion depth and volume (r ＞0.7).CONCLUSION:The bigger the toothbrushing force is,the more the dentine abrasion loss and the more serious the wedgeshaped defect will be.%目的:观察不同刷牙压力下牙本质磨损情况,分析不同刷牙压力对牙齿楔形缺损形成的影响.方法:取人前磨牙40个,制成40个牙本质试样后,将其随机分为5组(n =8),并置于V型牙刷磨耗试验机上分别在90 g(F90)、110 g(F110)、130 g(F130)、150 g(F150)、170 g(F170)的压力下各磨刷10 000次;然后用三维形貌仪测量各组牙本质的磨损深度、磨损体积和磨耗面粗糙度(Ra),并作相关性分析.结果:5组磨刷压力造成的牙本质磨损深度、磨损体积和Ra均以F90组最低,由低到高依次为F90＜ F110＜ F130＜ F150＜ F170(P＜0.01);相关性分析结果显示,Ra与磨损深度、体积均呈显著正相关性(r＞0.7,P＜0.01).结论:随着磨刷压力的增大,造成的牙本质磨损量也相应增加,牙齿楔形缺损损害加重.