电子束熔融（EBM）技术3D 打印纯钛冠的适合性研究

摘要

Objective:To study the fit of pure titanium single crown fabricated by electron beam melting(EBM).Methods:Pure titanium crowns were fabricated by EBM,selective laser melting(SLM),CAD/CAM(R +K and DMG)and conventional lost wax technique(LW)respectively(n =5).Marginal and internal gap was copied by light-body silicone and measured using a digital mi-croscope .The data of marginal gap(MG)and internal gap(IG)were statisticaly analysed by ANOVA and SPSS statistical package version 17.0.Results:The MG and IG(μm)of pure titanium crowns in EBM group were 38.42 ±6.72 and 105.54 ±33.18,in SLMgroup 38.63 ±6.82 and 114.63 ±52.18,in DMG CAD/CAMgroup 26.18 ±4.36 and 102.18 ±40.81,in R +K CAD/CAM group 26.98 ±4.44 and 102.24 ±25.30,in LW group were 42.61 ±5.73 and 102.98 ±45.67,respectively.The marginal fit of the EBMgroup was significantly smaller than 120 μm of the generally accepted clinical standards.In the 2 CAD/CAM groups the MG was smaller than that of other 3 groups(P <0.05).The IG of the 5 groups were not statisticaly different(P >0.05).Conclu-sion:The marginal fit of titanium single crown fabricated by EBMis similar to that by SLM,better than that of LW and inferior than that of CAD/CAM.The internal fit of the crowns made by the 5 systems is similar.%目的：评价电子束熔融（EBM）技术3D 打印纯钛单冠的适合性。方法：用 EBM、选择性激光熔覆（SLM）、2种CAD／CAM系统（R ＋K 公司与 DMG 公司）及常规铸造法（LW）分别制作纯钛单冠各5个，用硅橡胶法在体式显微镜下测量边缘及内部垂直间隙。SPSS17．0软件对实验数据进行单因素方差分析。结果：纯钛单冠的边缘和内部间隙（μm）分别为：EBM组38．42±6．72、105．54±33．18，SLM组38．63±6．82、114．63±52．18，DMG CAD／CAM组26．18±4．36、102．18±40．81，R ＋K CAD／CAM组26．98±4．44、102．24±25．30，铸造组42．61±5．73、102．98±45．67。EBM组边缘平均垂直间隙明显小于临床普遍接受的120μm 的标准，2个 CAD／CAM组边缘间隙均小于其他3组（P ＜0．05），5组纯钛冠的内部整体适合性无统计学差异（P ＞0．05）。结论：EBM3D 打印技术制备纯钛单冠的边缘适合性与 SLM技术相似，优于铸造法，小于 CAD／CAM法；内部适合性与其他技术无差异。