Lawaf Shirin, Nasermostofi Shahbaz, Afradeh Mahtasadat, Azizi Arash
Prosthodontics Department, Islamic Azad University, Dental Branch, Tehran, Iran.
Oral Medicine Department, Islamic Azad University, Dental Branch, Tehran, Iran.
J Adv Prosthodont. 2017 Feb;9(1):52-56. doi: 10.4047/jap.2017.9.1.52. Epub 2017 Feb 7.
Considering the importance of metal-ceramic bond, the present study aimed to compare the bond strength of ceramics to cobalt-chrome (Co-Cr) alloys made by casting and selective laser melting (SLM).
In this experimental study, two sample groups were prepared, with one group comprising of 10 Co-Cr metal frameworks fabricated by SLM method and the other of 10 Co-Cr metal frameworks fabricated by lost wax cast method with the dimensions of 0.5 × 3 × 25 mm (following ISO standard 9693). Porcelain with the thickness of 1.1 mm was applied on a 3 × 8-mm central rectangular area of each sample. Afterwards, bond strengths of the samples were assessed with a Universal Testing Machine. Statistical analysis was performed with Kolmogorov-Smirnov test and T-test.
Bond strength in the conventionally cast group equaled 74.94 ± 16.06 MPa, while in SLM group, it equaled 69.02 ± 5.77 MPa. The difference was not statistically significant ( ≤ .05).
The results indicated that the bond strengths between ceramic and Co-Cr alloys made by casting and SLM methods were not statistically different.
鉴于金属-陶瓷结合的重要性，本研究旨在比较通过铸造和选择性激光熔化（SLM）制成的陶瓷与钴铬（Co-Cr）合金之间的结合强度。
在本实验研究中，制备了两个样本组，一组由10个通过SLM方法制造的Co-Cr金属框架组成，另一组由10个通过失蜡铸造法制造的Co-Cr金属框架组成，尺寸为0.5×3×25mm（遵循ISO标准9693）。在每个样本的3×8mm中央矩形区域上施加厚度为1.1mm的瓷。之后，使用万能试验机评估样本的结合强度。采用Kolmogorov-Smirnov检验和T检验进行统计分析。
传统铸造组的结合强度为74.94±16.06MPa，而SLM组的结合强度为69.02±5.77MPa。差异无统计学意义（≤.05）。
结果表明，通过铸造和SLM方法制成的陶瓷与Co-Cr合金之间的结合强度在统计学上无差异。
