Laass Andrea, Sailer Irena, Hüsler Jürg, Hämmerle Christoph Hf, Thoma Daniel S
Int J Periodontics Restorative Dent. 2019 Jan/Feb;39(1):17-27. doi: 10.11607/prd.3792.
The objective of this trial study was to assess whether submucosal veneering of internally connected zirconia abutments influences clinical, radiographic, and technical outcomes of single-tooth implant-borne reconstructions at 5 years after loading. A total of 20 patients with 20 single-tooth implants in the anterior or premolar area of the maxilla or mandible were included. The implants were randomly restored with fixed single-tooth reconstructions using either pink-veneered customized zirconia abutments (test group = 10) or nonveneered customized zirconia abutments (control group = 10). All reconstructions were adhesively cemented with all-ceramic crowns. Follow-up examinations were performed at baseline (7 to 10 days after crown insertion) and at 1, 3, and 5 years after loading, at which points the following were assessed: periodontal parameters such as probing depth (PD), bleeding on probing (BOP), and marginal bone levels, as well as technical outcomes using the modified United States Public Health Service (USPHS) criteria. Statistical comparisons were based on the Wilcoxon-Mann-Whitney test. Sixteen patients attended the 5-year follow-up. At 5 years, the implant survival rate was 100% and the prosthetic survival rate was 94.1% (one abutment fracture in the test group). Veneering of the submucosal part of zirconia abutments resulted in significantly higher mean PD values: 3.6 ± 0.4 mm (test group) and 3.0 ± 0.5 mm (control group), P = .042. Marginal bone levels at 5 years and changes up to 5 years were not significantly different between groups (P > .05). One crown exhibited an abutment fracture and two crowns a minor chipping (17.6% overall technical complication rate). Limited by a small sample size, veneering of the submucosal part of internally connected zirconia abutments led to outcomes that were less favorable biologically (PD, BOP, and KM), but similar to nonveneered abutments radiographically and technically.
本试验研究的目的是评估内部连接的氧化锆基台的黏膜下贴面是否会影响单颗种植体支持的修复体在加载后5年的临床、影像学和技术效果。总共纳入了20例患者，他们在上颌或下颌的前部或前磨牙区有20颗单颗种植体。种植体被随机使用粉色贴面定制氧化锆基台（试验组 = 10）或非贴面定制氧化锆基台（对照组 = 10）进行固定单颗修复体修复。所有修复体均用全瓷冠粘结固位。在基线（冠插入后7至10天）以及加载后1年、3年和5年进行随访检查，此时评估以下内容：牙周参数，如探诊深度（PD）、探诊出血（BOP）和边缘骨水平，以及使用改良的美国公共卫生服务（USPHS）标准评估技术效果。统计比较基于Wilcoxon-Mann-Whitney检验。16例患者参加了5年随访。5年时，种植体存活率为100%，修复体存活率为94.1%（试验组有一个基台骨折）。氧化锆基台黏膜下部分的贴面导致平均PD值显著更高：3.6±0.4mm（试验组）和3.0±0.5mm（对照组），P = 0.042。两组之间5年时的边缘骨水平以及至5年的变化无显著差异（P>0.05）。一个冠出现基台骨折，两个冠有轻微崩瓷（总体技术并发症发生率为17.6%）。受样本量小的限制，内部连接的氧化锆基台黏膜下部分的贴面导致生物学效果（PD、BOP和KM）较差，但在影像学和技术方面与非贴面基台相似。
