降温速率对Noritake瓷与铸钛结合强度的影响  

Effects of cooling rate on the bonding strength of cast titanium to porcelain

作　　者：张若冰[1] 张玉梅[1] 祁韶鹏[1] 

机构地区：[1]西安第四军医大学口腔医学院修复科,710032

出　　处：《实用口腔医学杂志》2009年第3期344-347,共4页Journal of Practical Stomatology

基　　金：国家自然基金项目(编号:30672347);陕西省科学技术研究发展计划基金项目(编号:2005K14-G5);西安市科技计划基金项目(编号:SF08008)

摘　　要：目的:探讨烤瓷烧结过程中降温速率对钛铸件与瓷结合强度的影响。方法:根据ISO9693标准制作钛烤瓷试件,分别采用15、40、50、100℃/min4种不同的降温速率对钛烤瓷试样进行冷却,应用三点弯曲法测试钛/瓷结合强度,扫描电镜及能谱分析(SEM/EDS)观察钛表面瓷的残留量。结果:降温速率为15℃/min时的钛/瓷结合强度明显高于其他3组(P<0.01),降温速率为40℃/min和50℃/min时2组之间的钛/瓷结合强度在统计学上无明显差异(P>0.05)。降温速率为100℃/min时钛/瓷结合强度明显低于其他3组的钛/瓷结合强度(P<0.01)。SEM/EDS显示降温速率越快,钛表面残留瓷越少。结论:烤瓷熔附时,慢速降温可以有效提高钛/Noritake瓷的结合强度。Objective： To study effects of the cooling rate on the bonding characteristics of titanium porcelain bonded to cast titanium. Methods： According to ISO 9693, 24 cast titanium plates（25 mm ×3 mm ×0.5 mm）were prepared. The middle of the samples（8 mm × 3 mm） were bonded with bonding porcelain, opaque porcelain and dentin porcelain. The specimens from each porcelain-metal combination group were randomly assigned into four experimental cooling rate conditions, namely cooling rate of 15, 40, 50 and 100 ℃/min. A three-point-flexure-test was used to evaluate the bonding strength of titanium porcelain bonded to cast pure titanium. SEM/EDS were taken to characterize the failed surface of the titanium-porcelain interface. Statistical analyses were made by one-way analysis of variance （ANOVA）. Results： The bonding strength of 15℃/min group was significantly higher than other groups. There were no significant differences in bond strength between 40℃/min and 50 ℃/min groups. SEM/EDS revealed that with an increase cooling rate, the remained porcelains on the titanium side were decreased. Conclusion： The 15 ℃/ min cooling rate might be an effective method to improve the titanium-porcelain bonding strength.

关 键 词：降温速率 铸钛 瓷 结合强度 

分 类 号：R783.1[医药卫生—口腔医学]