Department of Reconstructive Dentistry, University Center for Dental Medicine Basel, University of Basel, Basel, Switzerland.
Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Basel, Switzerland.
Clin Implant Dent Relat Res. 2019 Feb;21(1):169-174. doi: 10.1111/cid.12681. Epub 2018 Oct 26.
Implant restorations became the first choice for single-tooth replacement today.
The prospective clinical trial aims to investigate computer-aided-design (CAD)/computer-aided-manufacturing (CAM)-processed implant crowns after 5 years of loading.
Twenty patients were included for cement-retained crowns in posterior sites. Radiographic analysis of bone levels was performed after delivery and follow-up. The Functional Implant Prosthodontic Score (FIPS) was assessed at the final follow-up. Wilcoxon signed-rank tests were used with a level of significance set at α = 0.05.
One implant was lost, resulting in a success rate of 95% at 5 years. For 19 crowns, neither technical complications nor biological complications were observed. The mean marginal bone level was 0.6 ± 0.26 mm (range: 0.18-1.12) mesially, and 0.79 ± 0.36 mm (range: 0.23-1.36) distally at 5 years. During the observation period, mean radiographic bone levels increased significantly by 0.23 mm at mesial and by 0.17 mm at distal sites (P < .0001) indicating minor additional bone loss. The mean total FIPS score was 8.2 ± 1.0 (range: 7-10) with the high score of 2.0 ± 0.0 for the variable "bone."
CAD/CAM-processed implant crowns demonstrated promising radiographic and clinical outcomes after 5 years in function. Future large-scale trials are crucial to confirm these initial results in the field of digital implant processing.
种植修复已成为当今单颗牙缺失修复的首选。
本前瞻性临床试验旨在研究经过 5 年负重后计算机辅助设计（CAD）/计算机辅助制造（CAM）加工的种植体冠。
20 名患者被纳入研究，用于后牙部位的粘结固位冠。在交付和随访后进行骨水平的放射学分析。最终随访时评估功能性种植修复体评分（FIPS）。采用 Wilcoxon 符号秩检验，显著性水平设为α=0.05。
1 颗种植体丢失，5 年后成功率为 95%。19 个冠均未观察到技术或生物学并发症。近中平均边缘骨水平为 0.6±0.26mm（范围：0.18-1.12），远中平均边缘骨水平为 0.79±0.36mm（范围：0.23-1.36）。在观察期间，近中部位的平均放射学骨水平显著增加了 0.23mm，远中部位增加了 0.17mm（P<0.0001），表明有轻微的额外骨丢失。平均总 FIPS 评分为 8.2±1.0（范围：7-10），其中“骨”变量的高分值为 2.0±0.0。
CAD/CAM 加工的种植体冠在功能上经过 5 年的使用后，显示出有前景的影像学和临床结果。未来的大规模试验对于在数字化种植体加工领域证实这些初步结果至关重要。
