AimTo assess the influence of the emergence angle on marginal bone loss (MBL) and supracrestal soft tissue around dental implants.Materials and MethodsIn six mongrel dogs, the mandibular premolars and molars were extracted. After 3 months of healing, four dental implants were placed in each hemimandible. The implants were randomly allocated to receive one of four customized healing abutments, each with a different value of the restorative emergence angle: 20°, 40°, 60° or 80°. Intra‐oral radiographs were taken after placing the healing abutments and at 6, 9, 16 and 24 weeks of follow‐up. Then, micro‐CT and undecalcified histology and synchrotron were performed. MBL over time was analysed with generalized estimating equations (GEEs) and adjusted for baseline soft‐tissue thickness.ResultsFrom implant placement to 24 weeks, GEE modelling showed that the MBL at mesial and distal sites consistently increased over time, indicating MBL in all groups (p < 0.001). The model indicated that MBL varied significantly across the different restorative angles (angle effect, p < 0.001), with 80° showing the greatest bone loss. Micro‐CT, histology and synchrotron confirmed the corresponding trends and showed that wide restorative angles (60° and 80°) impaired the integrity of the junctional epithelium of the supracrestal tissue.ConclusionsA wide restorative angle increases MBL and impairs the integrity of the junctional epithelium of the implant supracrestal complex.

中文翻译：

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较宽的修复性出苗角增加边缘骨丢失并损害种植体牙槽嵴上复合体交界上皮的完整性：一项临床前研究


目的 评估出苗角对种植牙周围边缘骨丢失 （MBL） 和牙槽嵴上软组织的影响。材料和方法在 6 只犬中，提取下颌前磨牙和磨牙。愈合 3 个月后，在每个半下颌骨中放置了 4 个种植牙。种植体被随机分配接受四种定制的愈合基台中的一种，每种基台具有不同的修复出苗角值：20°、40°、60° 或 80°。放置愈合基台后和随访 6 、 9 、 16 和 24 周时拍摄口腔内 X 线片。然后，进行 micro-CT 和未脱钙的组织学和同步加速器。使用广义估计方程 （GEE） 分析随时间变化的 MBL，并针对基线软组织厚度进行调整。结果从种植体植入到 24 周，GEE 模型显示近中和远中部位的 MBL 随着时间的推移持续增加，表明所有组都有 MBL （p < 0.001）。模型表明 MBL 在不同修复角度上差异显著 （角度效应，p < 0.001），其中 80° 显示骨质流失最大。显微 CT、组织学和同步加速器证实了相应的趋势，并表明较宽的修复角（60° 和 80°）损害了嵴上组织交界上皮的完整性。结论较宽的修复角会增加 MBL 并损害种植体牙嵴上复合体交界上皮的完整性。