OBJECTIVE To compare the implant-abutment connection microgap between computer-aided design and computer-aided manufacturing (CAD/CAM) milled or laser-sintered cobalt-chrome custom abutments with or without ceramic veneering and titanium stock abutments with or without crown cementation. MATERIAL AND METHODS Six groups of six abutments each were prepared: (1) CAD/CAM cobalt-chrome custom abutments: milled, milled with ceramic veneering, laser-sintered, and laser-sintered with ceramic veneering (four groups: MIL, MIL-C, SIN, and SIN-C, respectively) and (2) titanium stock abutments with or without zirconia crown cementation (two groups: STK and STK-Z, respectively). Abutments were screwed to the implants by applying 30 Ncm torque. All 36 samples were sectioned along their long axes. The implant-abutment connection microgap was measured using scanning electron microscopy on the right and left sides of the connection at the upper, middle, and lower levels. Data were analyzed using the Kruskal-Wallis test (p < .05). RESULTS Mean values (μm) of the microgap were 0.54 ± 0.44 (STK), 0.55 ± 0.48 (STK-Z), 1.53 ± 1.30 (MIL), 2.30 ± 2.2 (MIL-C), 1.53 ± 1.37 (SIN), and 1.87 ± 1.8 (SIN-C). Although significant differences were observed between the STK and STK-Z groups and the other groups (p < .05), none were observed between the milled and laser-sintered groups before or after ceramic veneering. The largest microgap was observed at the upper level in all groups. CONCLUSIONS Titanium stock abutments provided a closer fit than cobalt-chrome custom abutments. Neither crown cementation nor ceramic veneering resulted in significant changes in the implant-abutment connection microgap.

中文翻译：

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锥形连接种植体上钛原料与钴铬定制基台中微间隙的体外比较评估：牙冠粘接和陶瓷贴面的影响。


目的 比较计算机辅助设计和计算机辅助制造 （CAD/CAM） 铣削或激光烧结钴铬定制基台（带或不带陶瓷贴面）和钛基台（带或不带牙冠粘接）之间的种植体-基台连接微间隙。材料和方法 制备了六组六个基台： （1） CAD/CAM 钴铬定制基台：铣削、陶瓷贴面铣削、激光烧结和陶瓷贴面激光烧结（四组分别为 MIL、MIL-C、SIN 和 SIN-C）和 （2） 带或不带氧化锆冠粘接的钛基台（两组：分别为 STK 和 STK-Z）。通过施加 30 Ncm 扭矩将基台拧到种植体上。所有 36 个样品都沿其长轴切片。使用扫描电子显微镜测量种植体-基台连接微间隙的右侧和左侧的上、中、下水平。使用 Kruskal-Wallis 试验 （p < .05） 分析数据。结果 微间隙的平均值 （μm） 为 0.54 ± 0.44 （STK）、0.55 ± 0.48 （STK-Z）、1.53 ± 1.30 （MIL）、2.30 ± 2.2 （MIL-C）、1.53 ± 1.37 （SIN） 和 1.87 ± 1.8 （SIN-C）。尽管在 STK 和 STK-Z 组与其他组之间观察到显着差异 （p < .05），但在陶瓷贴面之前或之后，铣削组和激光烧结组之间未观察到。在所有组中，在上层观察到最大的微间隙。结论 钛原厂基台比钴铬合金定制基台更紧密。牙冠粘接和陶瓷贴面均未导致种植体-基台连接微间隙发生显著变化。