选择性激光熔覆（SLM）纯钛全冠适合性的临床研究

目的：临床评价选择性激光熔覆（SLM）技术制作的纯钛全冠适合性。方法：在临床选取10个因后牙牙体缺损需要单冠修复的患者，采用 SLMEOS M280系统及失蜡铸造法分别制作纯钛全冠（n ＝10），临床试戴后采用印模法复制单冠内部及边缘间隙，并在体式显微镜下测量。采用 SPSS 17．0软件对实验数据进行独立样本 t 检验。结果：纯钛单冠 SLM组和铸造组的边缘间隙（μm）分别为：90．67±14．7和94．77±21．9（P ＜0．05），中央间隙分别为213．73±90．4和217．00±97．7（P ＞0．05）。结论：SLM组边缘间隙小于铸造组、也小于临床普遍接受的120μm 的标准。

Clinical observation of the marginal and internal fit of titanium crowns fabricated by a selective laser mel-ting technology

Objective:To compare the marginal and internal fit of selective laser melting(SLM)titanium crowns with lost-wax cast (LW)titanium crowns.Methods:Titanium crowns of 10 subjects were fabricated by SLM and conventional LW respectively(n =10).The marginal and internal gaps of the crowns were recorded with silicon film using a replica technique.Each silicon film was cut into 2 parts and the thickness of silicon layer was measured at ×100 magnification using a stereomicroscope,the data of marginal gap (MG)and internal gap(IG)were statistically analysed by ANOVA and SPSS statistical package version 17.0.Results:The MG (μm)of the titanium crowns of SLMgroup and LMgroup were 90.67 ±14.7 and 94.77 ±21.9(P <0.05),IG were 213.73 ±90.4 and 217.00 ±97.7(P >0.05),respectively.Conclusion:The marginal fit of the SLMcrowns is better than that of the LW ones,and is significantly smaller than 120 μm of the clinical generally accepted standards.