CAJ | 학술논문

目的：评价选择性激光熔覆（SLM）技术与失蜡铸造法制作的钴铬合金单冠与三联冠的适合性。方法：采用2种 SLM系统 EOS M270与 EOS M280及铸造法分别制作钴铬合金单冠与三联冠各5个，通过采用硅橡胶法在体式显微镜下测量边缘及内部垂直间隙。采用 SPSS 17．0软件对实验数据进行单因素方差分析。结果：钴铬合金单冠的边缘间隙和内部间隙（μm）分别为：EOS M270组42．28±11．58、125．75±47．67，EOS M280组46．54±8．4、128．22±54．18，铸造组为48．66±12．08、135．37±46．89。三联冠的边缘间隙（μm）和内部间隙（μm）分别为：EOS M270组40．55±10．04、133．09±39．80，EOS M280组45．36±10、138．94±50．61，铸造组为54．24±12．04、151．87±61．94（P ＜0．05）。结论：SLM组边缘平均垂直间隙明显小于临床普遍接受的120μm 的标准，精度可以满足临床要求。SLM钴铬合金单冠的边缘适合性优于铸造法，内部适合性无统计学差异。SLM钴铬合金三联冠的边缘适合性及内部适合性均优于铸造法。
목적：평개선택성격광용복（SLM）기술여실사주조법제작적고락합금단관여삼련관적괄합성。방법：채용2충 SLM계통 EOS M270여 EOS M280급주조법분별제작고락합금단관여삼련관각5개，통과채용규상효법재체식현미경하측량변연급내부수직간극。채용 SPSS 17．0연건대실험수거진행단인소방차분석。결과：고락합금단관적변연간극화내부간극（μm）분별위：EOS M270조42．28±11．58、125．75±47．67，EOS M280조46．54±8．4、128．22±54．18，주조조위48．66±12．08、135．37±46．89。삼련관적변연간극（μm）화내부간극（μm）분별위：EOS M270조40．55±10．04、133．09±39．80，EOS M280조45．36±10、138．94±50．61，주조조위54．24±12．04、151．87±61．94（P ＜0．05）。결론：SLM조변연평균수직간극명현소우림상보편접수적120μm 적표준，정도가이만족림상요구。SLM고락합금단관적변연괄합성우우주조법，내부괄합성무통계학차이。SLM고락합금삼련관적변연괄합성급내부괄합성균우우주조법。
Objective:To compare the adaption of cobalt-chromium prostheses fabricated by selective laser melting(SLM)and conven-tional lost wax technique(LW)method.Methods:Cobalt-chromium crowns and three-unit fixed dental prostheses(FDPs)were fabrica-ted by selective laser melting(SLM)or by conventional lost wax technique(LW)respectively(n =5).Marginal fit and internal fit were examined using a light-body silicone.After setting,each silicon film was cut into 2 parts and the thickness of silicon layer was measured at 1 00 ×magnification using a digital microscope,the data of marginal gap(MG)and internal gap(IG)were statistically analysed by ANOVA and SPSS statistical package version 1 7.0.Results:The MG and IG(μm)of cobalt-chromium alloy crowns in EOS M270 group were 42.28 ±1 1 .58 and 1 25.75 ±47.67,in EOS M280 group 46.54 ±8.4 and 1 28.22 ±54.1 8,in LW group 48.66 ±1 2.08 and 1 35.37 ±46.89.The MG and IG(μm)of three-unit FDPs in EOS M270 group were 40.55 ±1 0.04 and 1 33.09 ±39.80,in EOS M280 group 45.36 ±1 0 and 1 38.94 ±50.61 ,in LW group 54.24 ±1 2.04 and 1 51 .87 ±61 .94(P <0.05),respectively.Conclu-sion:The marginal fit of the SLMgroup is superior to that of the LW group and significantly smaller than 1 20 μm of clinical generally accepted standards.SLMsystem can satisfy the clinical requirements.