高强度牙科陶瓷(A型)与松风Vintage AL饰面瓷结合的研究

目的考察高强度牙科陶瓷(A型)与松风Vintage AL饰面瓷之间的界面结合及匹配性,为其临床应用奠定基础.方法制作5 mm×5 mm×10 mm的高强度牙科陶瓷(A型)20个,分为两组,分别在端面上烧结松风Vintage AL和Vitadur alpha饰面瓷,剪切实验测定其剪切结合强度;另制作一双层瓷试件,界面做扫描电子显微镜(SEM)和能谱分析;制作上中切牙全瓷单冠10个,作热休克实验考察其抗瓷裂能力.结果高强度牙科陶瓷(A型)与Vintage AL的剪切结合强度为(55.52±14.64) MPa,与Vitadur alpha结合强度为(59.37±13.93)MPa,两者差异无统计学意义;扫描电镜观察及能谱分析,二者紧密接合,并有元素的扩散;全瓷冠的热休克温度为(179±15) ℃,裂纹多出现于牙冠唇面的饰面瓷.结论高强度牙科陶瓷(A型)与松风Vintage AL化学匹配及热匹配性良好,完全满足临床需要.

Compatibility Between High-strength Dental Ceramic (Type A) and Vintage AL Veneering Porcelain

OBJECTIVE: To investigate the interface bond strength and compatibility between High-Strength Dental Ceramic (type A) and Vintage AL veneering porcelain. METHODS: Twenty bar-shape specimens (ten Vintage AL and ten Vitadur alpha) were fabricated, and shear test was conducted to determine the bond strength. A bilayered composite (1 mm core ceramic and 0.8 mm Vintage AL) was prepared and then fractured for scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. Ten all-ceramic anterior crowns were fabricated and the temperatures of thermal shock resistance were tested. RESULTS: The mean values of the bond strength measured were (55.52 +/- 14.64) MPa and (59.37 +/- 13.93) MPa for Vintage AL and Vitadur alpha respectively (P>0.05). SEM showed tight connection between the High-Strength Dental Ceramic (type A) and the veneering porcelain. Element diffusion was also confirmed by energy dispersive spectroscopy (EDS) analysis. The temperature of thermal shock resistance of this system was (179 +/- 15) degrees C. CONCLUSION: Vintage AL veneering porcelain has good thermal and chemical compatibility with High-Strength Dental Ceramic (type A).