光固化与化学固化复合树脂黏接正畸托槽的对比研究

目的对比光固化、化学固化复合树脂黏接正畸托槽的抗剪强度和牙釉质脱矿程度。方法20颗离体前磨牙随机分为光固化复合树脂组(1)和化学固化复合树脂组(2),检测抗剪黏接强度;将116例正畸患者左右侧上前牙随机分为2组,试验组用光固化复合树脂黏接托槽,对照组用化学固化复合树脂黏接托槽,对比正畸治疗结束后两组牙釉质脱矿的差异。结果2组黏接抗剪强度为:(1)组(17.45±7.06)MPa,(2)组(13.02±5.38)MPa,两组间有差异(P<0.05)。试验组与对照组正畸治疗结束后牙釉质脱矿程度有显著差异(P<0.01)。结论光固化型复合树脂的抗剪强度优于化学固化型。光固化复合树脂黏接正畸托槽能减少正畸治疗中牙釉质脱矿。

A Comparative Study of Light-Activated Resin Adhesive and Chemically-Activated Resin Adhesive

Objective To evaluate the bonding strength of light-activated resin adhesive and chemically-activated resin adhesive, and the decalcificatition of the enamel surface used these two kinds of orthodontic bonding agents. Methods Twenty extracted premolars were randomly divided into two groups, namely: (1) bonded brakets with light-activated resin adhesive, (2) bonded brakets with chemically-activated resin adhesive. The shear bonding strength of these two groups was tested. 116 orthodontic patients were chosen to bond brackets on their teeth. the decalcification difference between the experiment and control group was evaluated. Results The shear bonding strength of the light-activated resin adhesive reached 17 MPa. Comparing with control group, enamel decalcification reduced with statistically significant difference in experiment group. Conclusion The shear bond strength of light-activated resin adhesive is higher than that of chemically-activated resin adhesive. Bonding brackets with light-activated resin adhesive can prevent the enamel from decalcification during orthodontic treatment.