ObjectivesVariations in transmucosal abutment contour design may affect the outcomes of implant therapy. This randomized controlled trial was primarily aimed at testing the effect that CAD/CAM zirconia abutments with either a concave or linear divergent transmucosal morphology have on peri‐implant mucosal dynamics and indicators of peri‐implant health at 1 year after final implant‐supported prosthesis insertion in the anterior maxilla.Materials and MethodsFollowing computer‐guided implant placement and osseointegration, eligible subjects were randomized into either the experimental (concave morphology) or the control (linear divergent morphology) group. A comprehensive set of outcomes of interest related to peri‐implant soft tissue dynamics, phenotypical features, and indicators of peri‐implant health were assessed at different time points over a 1‐year period after insertion of the final restoration.ResultsOut of 60 initially recruited subjects, a total of 54 completed the study (n = 29 in the experimental group concave/n = 25 in the control group). Overall implant survival and restoration rates between master impression and 12 months were 100% and 98.2%, respectively. Although a trend for coronal migration of the buccal mucosa zenith, gain in mucosal thickness, and increased probing depth and bleeding on probing was observed in both groups, these changes were clinically negligible, and no substantial differences were observed between study groups regardless of variations in transmucosal abutment morphology.ConclusionThe use of either linear divergent or concave custom CAD/CAM zirconia abutments in a screw‐retained, delayed loading approach yielded no significant differences.

中文翻译：

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CAD/CAM 基台形态对种植体治疗结果的影响：一项随机对照试验


目的经粘膜基台轮廓设计的变化可能会影响种植体治疗的结果。这项随机对照试验主要旨在测试具有凹形或线性发散经粘膜形态的 CAD/CAM 氧化锆基台对种植体周围粘膜动力学的影响和种植体周围健康指标在最终种植体支撑修复体插入上颌前牙后 1 年。材料和方法在计算机引导的种植体植入和骨整合之后，符合条件的受试者被随机分配到实验组 （凹形形态） 或对照组 （线性发散形态） 组。在插入最终修复体后的 1 年内，在不同时间点评估了与种植体周围软组织动力学、表型特征和种植体周围健康指标相关的一组综合感兴趣的结果。结果在最初招募的 60 名受试者中，共有 54 名完成了研究 （实验组 n = 29 凹/对照组 n = 25）。主印模和 12 个月之间的总种植体存活率和修复率分别为 100% 和 98.2%。尽管在两组中都观察到颊粘膜天顶冠状位迁移、粘膜厚度增加、探诊深度增加和探诊出血的趋势，但这些变化在临床上可以忽略不计，并且无论经粘膜基台形态如何，研究组之间均未观察到显著差异。结论在螺钉保持、延迟加载方法中使用线性发散或凹面定制 CAD/CAM 氧化锆基台没有产生显着差异。