增强牙体抗折强度的树脂修复研究  

Effect of composite restoration on the reinforcement of teeth

作　　者：何园[1] 赵守亮[1] 张晓磊[1] 刘海江[1] 张晓颖[1] 

机构地区：[1]同济大学口腔医学院口腔内科,上海200072

出　　处：《中华口腔医学杂志》2007年第5期300-303,共4页Chinese Journal of Stomatology

摘　　要：目的研究树脂充填材料是否具有增强薄弱牙体组织抗折强度的作用及其可能的作用机制。方法选择60颗无龋上颌第一前磨牙,制备成特定大小的近中-(牙合)面-远中洞形(洞形颊舌径:2.8～3.2 mm,腭尖宽度:2.0 mm,腭尖高度:5.0 mm),将所有样本按随机数字表法随机分为6组,每组10颗牙。第1组为对照组,进行牙体制备但不充填;第2组采用银汞合金充填;第3组采用通用杂合型树脂 Z250充填,但不粘结;第4组采用复合体材料 F2000充填;第5组采用 Z250充填;第6组采用纳米型树脂 Z350充填。通过垂直加压铁杆以1 mm/min 的速度对各组样本加压,检测导致牙体折裂所需的最小压力。所得数据采用方差分析,显著性水准为0.05。结果各组牙体折裂的平均压力分别为:第1组(245.29±39.49)N,第2组(255.09±42.14)N,第3组(267.34±31.56)N,第4组(293.90±33.42)N,第5组(337.81±32.63)N,第6组(349.08±32.93)N。第1、2、3组间牙体折裂的平均压力差异无统计学意义(P>0.05);第4、5、6组与第1、2组相比,牙体折裂平均压力差异有统计学意义(P<0.05);第5组与第3组相比,牙体折裂的平均压力差异有统计学意义(P<0.01);第4组与第5、6组相比,牙体折裂的平均压力差异有统计学意义(P<0.01);第5组与第6组牙体折裂的平均压力差异无统计学意义。结论树脂充填材料具有增强薄弱牙体组织抗折强度的作用,其作用与充填材料和牙体间的粘结力、收缩应力及弹性模量有关。临床上可选用与牙本质弹性模量相近的充填材料,增强充填材料与牙体间的粘结力将有利于增强牙体的抗折强度。Objective To determine the effect of composite restoration on reinforcement of weakened tooth structure and the possible mechanism. Methods Sixty freshly extracted noncarious maxillary premolars were collected and divided into 6 groups with 10 specimen in each group. MOD cavities （ buccolingnal width： 2. 8 to 3. 2 mm; palatal cusp width ： 2. 0 mm; cusp height： 5.0 mm ） were prepared individually. Group 1 was prepared and not restored （control）. The other 5 groups were restored with silver amalgam alloy （ group 2 ）, 72250 without bonding （ group 3 ）, F2000 （ group 4 ）, Z250 （ group 5 ） and Z350 nanocomposite（ group 6 ） （3M ESPE ） respectively. The fracture resistance of the tested teeth was determined by applying a vertical splitting load through a specially shaped steel rod at a crosshead speed of 1 mm/min. The data were analyzed by ANOVA. Results The average fracture resistance of the 6 groups was ： （245.29 ± 39. 49） N （ group 1 ）, （255.09 ± 42. 14） N （ group 2）, （267.34 ± 31.56 ） N （ group 3 ）, （293.90 ± 33.42） N （ group 4）, （337.81 ± 32.63 ） N （ group 5 ） and （ 349.08 ± 32.93 ） N （ group 6）. There was no significant difference between the group 1, group 2 and group 3. The fracture resistance of group 4, group 5 and group 6 was higher than that of group 1 and group 2 （ P 〈 0. 05 ）. Significant difference was noted between group 5 and group 3（P 〈 0. 01 ）. The fracture resistance of group 4 was much lower than that of group 5 and group 6 （P 〈0.01 ）. No significant difference was found between group 5 and group 6. Conclusions The use of composite increased the fracture resistance of the tooth with an MOD restoration. This effect was related to the adhesive force, polymerization shrinkage stress and the elastic modulus of the composite.

关 键 词：复合树脂类 牙折断 牙应力分析 抗压强度 

分 类 号：R783[医药卫生—口腔医学]