目的: 比较Er:YAG激光和磷酸分别处理后的牙釉质与IPS e.max Press铸瓷间的粘接效果。方法: 36颗人类上颌前磨牙随机分为3组, 第1组: 37%磷酸处理; 第2组: Er:YAG激光(120 mJ/10 HZ)处理; 第3组: Er:YAG激光刻蚀后磷酸酸蚀。应用扫描电子显微镜显示分析各组处理后的牙釉质形态变化, 并使用万能力学测试机记录抗剪切强度值。结果: 37%磷酸处理组抗剪切强度值最高(25.92±0.97 MPa), 与Er:YAG激光单独处理组差异无统计学意义(P＞0.05), 激光与磷酸联合组呈现最低值(17.53±0.79 MPa), 与其他组相比差异皆有统计学意义(P＜0.05)。结论: Er:YAG激光单独处理的牙釉质与IPS e.max Press铸瓷间粘接效果同磷酸酸蚀方法相似, 在粘结铸瓷前代替传统酸蚀处理牙釉质方面是有潜力的。

Objective: The purpose of this study was to compare bonding effects of IPS e.max Press ceramic bonded to enamel prepared by Er:YAG laser and acid-etching. Methods: In this study,36 human upper premolars were randomly assigned to three groups. Group 1:37% phosphoric acidetching; Group 2:Er:YAG Laser(120 mJ/10 Hz); Group 3: Er:YAG laser followed by phosphoric acid etching. Analysis of the treated surfaces was performed by scanning electron microscopy to assess morphological differences among the groups. The shear bond strength were measured by a universal testing machine. Results: The bond strength in the acid-etched group showed the highest value(25.92±0.97 MPa)and it was not significantly different from the laser group(P>0.05).The group treated with laser+acid had the lowest SBS value(17.53±0.79 MPa) and being significantly from the other groups(P<0.05). Conclusions: Er:YAG laser and acid-etching had similar effects on shear strength of IPS e.max Press ceramic bonded to enamel. Er:YAG laser can be a potential alternative tool to conventional acid etching.