钾铝硅系统牙科玻璃陶瓷嵌体边缘适合性的实验研究

In vitro Study on Marginal Adaptation of K_2O-Al_2O_3-SiO_2 System Dental Glass Ceramic Inlays

目的:研究双固化粘结剂粘结钾铝硅(K2O-Al2O3-SiO2)系统牙科玻璃陶瓷的微渗漏情况。方法:制备钾铝硅系统牙科玻璃陶瓷瓷锭;选择清理24颗离体牙,即刻完成根管充填;在每颗离体牙的颊舌面颈部各预备一个V类洞型;将离体牙随机分成两组,第1组离体牙不预备粘结间隙、第2组离体牙预备约100μm的粘结间隙;用"热压铸入"法制作牙科陶瓷嵌体,用VariolinkⅡ双固化粘结剂粘结;从每组样本中随机抽取6颗离体牙,浸入25℃的品红溶液中24h,测量染色剂在洞壁的染色深度;另外12颗离体牙浸入25℃的复方生理盐水中2个月,在SEM下观察样本粘结剂的丧失情况。结果:染色渗透实验和SEM分析显示,两组样本均在陶瓷/粘结剂界面产生较高的边缘封闭质量(组1样本中陶瓷/粘结剂界面裂隙量的平均值为(12.4±4.5)%,明显低于组1样本中粘结剂/牙体界面裂隙量的平均值(38.9±8.8)%;组2样本中陶瓷/粘结剂界面裂隙量的平均值为(32.6±15.8)%,明显低于组2样本中粘结剂/牙体界面裂隙量平均值(67.9±23.1)%;没有粘结间隙的样本比有粘结间隙的样本具有更好的边缘适合性能(组1样本粘结剂裂隙量的平均值(15.7±7.3)%,明显低于组2样本中者(57.4±19.5)%。结论:较大的粘结间隙不能完全补偿双固化粘结系统树脂的聚合收缩,在使用双固化粘结系统粘结K2O-Al2O3-SiO2系统牙科玻璃陶瓷嵌体时应该避免制备较大的粘结间隙。

Objective：To evaluate the effect of dual cure resin with different luting space on the micro-leakage of K2O-Al2O3-SiO2 system dental glass ceramic inlays.Methods：K2O-Al2O3-SiO2 system dental glass ceramics was fabricated.Buccal and lingual class V cavities were prepared in 24 extracted young premolars.The premolars were devided into two groups randomly.Luting space between inlay and tooth weren＇t made in group1,the gap dimensions in group 2 was about 100μm.Then,K2O-Al2O3-SiO2 system ceramic inlays with above gap dimensions were fabricated.All inlays were cemented with VariolinkⅡluting system.Half of the specimens （24 inlays） in each group were immersed in basic fuchsin solution,and the dye penetration along the cavity walls was measured.The other half specimens （24inlays） were observed along the margin of the restoration by SEM to analyze marginal adaptation.Kruskal-Wallis and t-test were used to analyze the digital document.Results：Better marginal sealing effect showed at ceramics/composite interface in both groups,and better marginal adaptation were observed in the specimens without luting space.Conclusion：Polymerization stress within dual cure resin cement could not be compensated completely in larger luting space.Larger luting space should be avoided when dual cure resin cement is used on K2O-Al2O3-SiO2 system dental glass ceramic restoration.