不同制作技术及粘接剂对氧化铝全瓷冠边缘微渗漏的影响

摘要

目的：评价不同制作技术及粘接剂对In-Ceram氧化铝全瓷冠边缘微渗漏的影响。方法3种技术制作氧化铝全瓷冠各15个，分别采用3种粘接剂粘固于离体牙，温度循环实验后，将样本放入质量分数为2%的亚甲蓝溶液48h，体式显微镜观察牙与粘接剂界面的微渗漏状况，记录观察结果，对实验数据进行统计分析。结果自粘结树脂型粘接剂微渗漏最小，其次是树脂加强型玻璃离子，玻璃离子微渗漏最大（P＜0.05）；采用树脂加强型玻璃离子和玻璃离子粘固不同全瓷冠时，粉浆涂塑氧化铝冠的微渗漏最大（P＜0.05）。结论 Cerec inLab system制作的全瓷冠边缘微渗漏小。自粘结树脂型粘接剂抗边缘微渗漏能力强，是粘固In-Ceram氧化铝全瓷冠的理想粘接剂。%Objective To evaluate the marginal microleakage of different In-Ceram alumina crowns using different cements. Methods 45 extracted maxillary first premolars were prepared for a complete coverage restoration and were fabricated on the models using the following systems:Group SL,the slip-cast technique (In-Ceram system);Group CR,a CAD/CAM system (Cerec inLab system) and Group WO,the electro-deposition dipping technique (Wol-Ceram). Luted onto standard prepared teeth using different cements,after temperature cycling test,all the crowns were then immersed in 2%methylene blue dye for a period of 48h. The marginal microleakage at tooth interfaces was observed using stereomictoscopy and evaluated in classification index. The data were subjected to statistical analysis using Kruskal-Wallis U test and Mann-Whitney test. Results The difference in microleakage between three crowns using different cements was statistically significant(P<0.05). Conclusion The copings fabricated using Cerec inLab system had an observable decrease in mircoleakage. RelyXTM Unicem adhensive resin luting system which was the first se-lection in clinical was better than glass ionomer and was good at In-Ceram alumina crown.