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首页> 外文期刊>The Journal of Advanced Prosthodontics >Bond and fracture strength of metal-ceramic restorations formed by selective laser sintering
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Bond and fracture strength of metal-ceramic restorations formed by selective laser sintering

机译：选择性激光烧结形成的金属陶瓷修复体的结合强度和断裂强度

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PURPOSE The purpose of this study was to compare the fracture strength of the metal and the bond strength in metal-ceramic restorations produced by selective laser sintering (SLS) and by conventional casting (CAST). MATERIALS AND METHODS Non-precious alloy (StarLoy C, DeguDent, Hanau, Germany) was used in CAST group and metal powder (SP2, EOS GmbH, Munich, Germany) in SLS group. Metal specimens in the form of sheets (25.0 × 3.0 × 0.5 mm) were produced in accordance with ISO 9693:1999 standards (n=30). To measure the bond strength, ceramic was fired on a metal specimen and then three-point bending test was performed. In addition, the metal fracture strength was measured by continuing the application of the load. The values were statistically analyzed by performing independent t -tests (α=.05). RESULTS The mean bond strength of the SLS group (50.60 MPa) was higher than that of the CAST group (46.29 MPa), but there was no statistically significant difference. The metal fracture strength of the SLS group (1087.2 MPa) was lower than that of the CAST group (2399.1 MPa), and this difference was statistically significant. CONCLUSION In conclusion the balling phenomenon and the gap formation of the SLS process may increase the metal-ceramic bond strength.
机译：目的本研究的目的是比较通过选择性激光烧结（SLS）和常规铸造（CAST）生产的金属陶瓷修复体中的金属断裂强度和结合强度。材料与方法CAST组使用非贵金属（StarLoy C，DeguDent，德国），SLS组使用金属粉末（SP2，EOS GmbH，慕尼黑，德国）。根据ISO 9693：1999标准（n = 30）生产片状的金属样品（25.0×3.0×0.5 mm）。为了测量粘合强度，在金属样品上烧制陶瓷，然后进行三点弯曲试验。另外，通过继续施加载荷来测量金属断裂强度。通过进行独立的t检验对这些值进行统计学分析（α= .05）。结果SLS组的平均粘结强度（50.60 MPa）高于CAST组的平均粘结强度（46.29 MPa），但无统计学差异。 SLS组的金属断裂强度（1087.2 MPa）低于CAST组的金属断裂强度（2399.1 MPa），这一差异具有统计学意义。结论综上所述，SLS工艺的起球现象和间隙形成可能会增加金属-陶瓷结合强度。

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