Metal-ceramic bond strength of Co-Cr alloy fabricated by selective laser melting.
Metal-ceramic bond strength of Co-Cr alloy fabricated by selective laser melting.
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DOI：
10.1016/j.jdent.2012.02.006
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发表时间：
2012-06
影响因子：
4.4
通讯作者：
N. Xiang;Xian-zhen Xin;Jie Chen;B. Wei
中科院分区：
文献类型：
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作者：
N. Xiang;Xian-zhen Xin;Jie Chen;B. Wei
目的本研究旨在评估采用选择性激光熔化 (SLM) 技术制备的 Co-Cr 牙科合金的金属-陶瓷结合强度。 方法采用 SLM 或传统失蜡铸造方法制备两组，每组由 20 个 Co-Cr 金属棒组成。每组中的十根棒材被模制成标准 ISO 9693:1999 尺寸的 25mm×3mm×0.5mm，并在每根棒材中心的 8mm×3mm 矩形区域上熔合 1.1mm 的陶瓷。使用三点弯曲测试评估金属陶瓷结合。通过使用 SEM/EDS 测量样品的 Si 含量来确定断裂模式分析和附着瓷面积分数 (AFAP)。结果 组内学生的 t 检验表明 SLM 和传统铸造样品组之间的平均粘合强度没有显着差异。虽然 SEM/EDS 分析表明 SLM 和铸造组的脱粘界面上存在混合断裂模式，但 SLM 组的瓷附着力明显高于对照组 (p<0.05)。结论 SLM 金属-陶瓷系统表现出的结合强度超出了 ISO 9691:1999(E) 的要求，甚至在瓷附着力测试中表现出与传统铸造方法相比更好的表现。
OBJECTIVESThis study was to evaluated the metal–ceramic bond strength of a Co–Cr dental alloy prepared using a selective laser melting (SLM) technique.METHODSTwo groups comprised of twenty Co–Cr metal bars each were prepared using either a SLM or traditional lost-wax casting method. Ten bars from each group were moulded into standard ISO 9693:1999 dimensions of 25mm×3mm×0.5mm with 1.1mm of porcelain fused onto an 8mm×3mm rectangular area in the centre of each bar. Metal–ceramic bonding was assessed using a three-point bending test. Fracture mode analysis and area fraction of adherence porcelain (AFAP) were determined by measuring Si content of specimens by SEM/EDS.RESULTSStudent's t-test within the groups demonstrated no significant difference for the mean bond strength between the SLM and traditional cast sample groups. While SEM/EDS analysis indicated a mixed fracture mode on the debonding interface of both the SLM and the cast groups, the SLM group showed significantly more porcelain adherence than the control group (p<0.05).CONCLUSIONSThe SLM metal–ceramic system exhibited a bonding strength that exceeds the requirement of ISO 9691:1999(E) and it even showed a better behaviour in porcelain adherence test comparable to traditional cast methods.