SLM国产CoCr合金机械性能和金瓷结合强度的研究
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摘要
目的评估基于选区激光融化(selective laser melting,SLM)技术的国产CoCr合金试件的机械性能和金瓷结合强度。方法采取SLM技术和铸造法构造哑铃试件(0°,45°和90°)和金瓷结合试件。在室温下进行拉伸实验并观察断面形貌;通过三点弯测试检测金瓷结合强度并分析金瓷界面特征。结果铸造组、国产SLM组和进口SLM组的弹性模量、抗拉强度和断后伸长率间有统计学差异(P<0.05);SLM组中,不同构造角度间的弹性模量、抗拉强度和断后伸长率之间无统计学差异;金瓷结合强度方面,铸造组[(30.78±3.23)MPa],进口SLM组[(39.31±3.32)MPa]、国产SLM组[(53.89±5.60)MPa]3组间差异有统计学意义(P<0.05)。结论国产SLM组能获得与进口SLM组相当的机械性能;国产SLM组的金瓷结合强度优于进口SLM组和铸造组,能满足临床使用的需求。
Objective To evaluate the mechanical properties and porcelain bond strength of domestic CoCr alloy specimens based on selected laser melting(SLM) technology. Methods SLM technology was used to construct dumbbell specimens(0°, 45° and 90°) and ceramic specimens. The cast specimens of the same size were made by traditional casting method. Tensile test was carried out at room temperature and the shape of the microstructure was observed. The porcelain bond strength was measured by a three-point bend test, and the metal-ceramic interface was observed by scanning electron microscopy. Results There were significant differences in mechanical properties(including elastic modulus, tensile strength and elongation) among the casting group, the domestic SLM group and the imported SLM group(P<0.05). In the SLM group, there was no significant difference in elastic modulus, tensile strength and elongation among different fabricated angles. The porcelain bond strength of casting group was 30.78±3.23 MPa, which was lower than that in the imported SLM group(39.31±3.32 MPa) and the domestic SLM group(53.89±5.60 MPa, P<0.05). Conclusion The domestic SLM group obtains the similar mechanical properties to the imported SLM group. It has higher bonding strength than the other 2 groups, and can meet the needs of clinical use.
Objective To evaluate the mechanical properties and porcelain bond strength of domestic CoCr alloy specimens based on selected laser melting(SLM) technology. Methods SLM technology was used to construct dumbbell specimens(0°, 45° and 90°) and ceramic specimens. The cast specimens of the same size were made by traditional casting method. Tensile test was carried out at room temperature and the shape of the microstructure was observed. The porcelain bond strength was measured by a three-point bend test, and the metal-ceramic interface was observed by scanning electron microscopy. Results There were significant differences in mechanical properties(including elastic modulus, tensile strength and elongation) among the casting group, the domestic SLM group and the imported SLM group(P<0.05). In the SLM group, there was no significant difference in elastic modulus, tensile strength and elongation among different fabricated angles. The porcelain bond strength of casting group was 30.78±3.23 MPa, which was lower than that in the imported SLM group(39.31±3.32 MPa) and the domestic SLM group(53.89±5.60 MPa, P<0.05). Conclusion The domestic SLM group obtains the similar mechanical properties to the imported SLM group. It has higher bonding strength than the other 2 groups, and can meet the needs of clinical use.
引文
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[2] VAN NOORT R. The future of dental devices is digital[J].Dent Mater,2012,28(1):3-12.DOI:10.1016/j.dental.2011.10.014.
[3] LINDNER M,HOEGES S,MEINERS W,et al.Manufacturing of individual biodegradable bone substitute implants using selective laser melting technique[J].J Biomed Mater Res A,2011,97(4):466-471.DOI:10.1002/jbm.a.33058.
[4] ALKMIN L B, NUNES C A, SANTOS C D, et al. Microstructural evidence of beryllium in commercial dental Ni-Cr alloys[J]. Mat Res,2014,17(3):627-631.DOI:10.1590/S1516-14392014005000018.
[5] CHEN W C, TENG F Y, HUNG C C. Characterization of Ni-Cr alloys using different casting techniques and molds[J]. Mater Sci Eng C Mater Biol Appl, 2014, 35:231-238.DOI:10.1016/j.msec.2013.11.014.
[6] WU L, ZHU H, GAI X, et al. Evaluation of the mechanical properties and porcelain bond strength of cobalt-chromium dental alloy fabricated by selective laser melting[J]. J Prosthet Dent,2014,111(1):51-55.DOI:10.1016/j.prosdent.2013.09.011.
[7] SUNDAR M K, CHIKMAGALUR S B, PASHA F. Marginal fit and microleakage of cast and metal laser sintered copings-an in vitro study[J].J Prosthodont Res,2014,58(4):252-258.DOI:10.1016/j.jpor.2014.07.002.
[8] AL JABBARI Y S, KOUTSOUKIS T, BARMPAGADAKI X, et al. Metallurgical and interfacial characterization of PFM Co-Cr dental alloys fabricated via casting, milling or selective laser melting[J]. Dent Mater,2014,30(4):e79-e88.DOI: 10.1016/j.dental.2014.01.008.
[9] 苏海军,尉凯晨,郭伟,等.激光快速成形技术新进展及其在高性能材料加工中的应用[J].中国有色金属学报,2013,23(6):1567-1574.DOI:10.19476/j.ysxb.1004.0609.2013.06.012. SU H J,WEI K C,GUO W,et al.New development of laser rapid forming ant its application in high performance materials processing[J]. Chin J Nonferrous Metal, 2013,23(6):1567-1574.DOI:10.19476/j.ysxb.1004.0609.2013.06.012.
[10] 孙婷婷,杨永强,苏旭彬,等.316L不锈钢粉末选区激光熔化成型致密化研究[J].激光技术,2010,34(4):443-446.DOI:10.3969/j.issn.1001-3806.2010.04.004. SUN T T,YANG Y Q,SU X B,et al.Research of densification of 316L stainless steel powder in selective laser melting process[J].Laser Technol,2010,34(4):443-446.DOI:10.3969/j.issn.1001-3806.2010.04.004.
[11] 陈光霞,覃群.选择性激光熔化快速成型复杂零件精度控制及评价方法[J].组合机床与自动化加工技术,2010(2):102-105.DOI:10.3969/j.issn.1001-2265.2010.02.028. CHEN G X,QIN Q.Controlling and evaluation of precision of complex components produced by SLM[J].Modul Mach Tool Automat Manuf Tech, 2010(2):102-105.DOI:10.3969/j.issn.1001-2265.2010.02.028.
[12] MONROY K, DELGADO J, CIURANA J. Study of the pore formation on CoCrMo alloys by selective laser melting manufacturing process[J].Procedia Eng,2013,63:361-369. DOI:10.1016/j.proeng.2013.08.227.
[13] KAJIMA Y, TAKAICHI A, NAKAMOTO T, et al. Fatigue strength of Co-Cr-Mo alloy clasps prepared by selective laser melting[J]. J Mech Behav Biomed Mater,2016,59:446-458.DOI:10.1016/j.jmbbm.2016.02.032.
[14] LIU Y,WANG Z,GAO B,et al.Evaluation of mechanical properties and porcelain bonded strength of nickel-chromium dental alloy fabricated by laser rapid forming[J].Lasers Med Sci,2010,25(6):799-804.DOI:10.1007/s10103-009-0690-3.
[15] BAE E J,KIM J H,KIM W C,et al. Bond and fracture strength of metalceramic restorations formed by selective laser sintering[J]. J Adv Prosthodont,2014,6(4):266-271. DOI:10.4047/jap.2014.6.4.266.
[16] 吴峻岭.新型牙用烤瓷支架钴铬合金金瓷结合的研究[D].成都:四川大学,2005. WU J L. A study of metal-ceramic bonding on a new type of cobalt-chromium alloy for both dental framework and porcelain fused to metal[D].Chengdu:Sichuan University,2005.