摘要
目的采用三点弯曲法评价选区激光熔化钴铬合金金-瓷结合强度，以期为修复临床提供参考。方法依据ISO9693标准，分别用铸造法（铸造组）和选区激光熔化法（选区激光熔化组）制作钴铬合金试件，每组6个，试件中间区域熔附瓷粉。三点弯曲法测试金-瓷结合强度，采用SPSS13．0软件进行t检验，分析两组金-瓷结合强度差异；扫描电镜和能谱仪进行金-瓷结合界面分析。结果铸造组和选区激光熔化组金-瓷结合强度分别为（33．45±2．34）和（31．62±2．34）MPa，两组差异无统计学意义（t=0．79，P〉0．05）。两组试件断裂类型均为混合断裂，仅微量瓷残余。结论选区激光熔化钴铬合金修复体可满足临床对金-瓷结合强度的要求。
Objective To eveluate the metal-ceramic bond strength of a selective laser melting Co-Cr alloy. Methods Twelve Co-Cr metal bars were prepared according to the ISO 9693 standard with Vita porcelain fused onto the centre of each bar. Then the sample bars were derided into two groups of six each. The control group was made by traditional cast process （ cast group）, and the experimental group was processed by selective laser melting （ SLM ） technology （ SLM group ）. Metal-ceramic bonding strength and fracture mode were assessed using three-point bending test. Fracture mode analysis was determined by scanning electronic microscope/energy dispersive spectroscopy. Student＇s t-test was used to analyze the data in SPSS 13.0. Results The metal-ceramic bond strength value of the cast group was （ 33.45 ± 2. 34） MPa, and that of the SLM group was （ 31.62 ± 2. 34 ） MPa （ t = 0. 79, P 〉 0.05 ）. A mixed fracture mode on the debonding interface of all specimens was observed, while little porcelain was reserved. Conclusions The metal-ceramic system processed by SLM exhibited a bonding strength that satisfies the requirement of clinical application.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2013年第3期170-172,共3页
Chinese Journal of Stomatology
关键词
抗压强度
铬合金
选区激光熔化
Compressive strength
Chromium alloys
Selective laser melting
