Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland.
Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Bern, Switzerland.
Clin Oral Implants Res. 2021 Oct;32(10):1176-1189. doi: 10.1111/clr.13815. Epub 2021 Aug 25.
The present pilot study analyzed two abutment types (a retentive ball and a non-retentive dome) in implant-assisted removable partial dentures (IARPDs) on 6 mm short implants with respect to clinical, radiological, and patient-reported outcomes (PROs), during the first year.
Two implants were placed bilaterally in mandibular molar sites, converting existing free-end removable partial dentures (RPDs) to IARPDs. Twelve subjects were randomized to initially receive either the dome (Group A, n = 6) or the ball abutment (Group B, n = 6). After eight weeks, the abutments were exchanged. After another 8 weeks, the participants were given the choice of one of the abutments. Mean values and standard deviations (SD) were calculated, and random-effect linear regression analyses were applied to analyze marginal bone level alterations and PROs (α < .05).
Twelve participants were included in the study; however, one dropout occurred. Patient ratings increased significantly in both study groups. The majority of the participants (82%) ultimately chose the ball abutment. The implant survival rate was 100%, and the success rate was 90.9% twelve months after implant placement (mean peri-implant bone-loss: -1.2; SD: 0.6 mm) without a statistically significant difference between the study groups, in terms of clinical- and radiological outcomes.
Placing 6 mm short implants at mandibular molar sites of RPD wearers seems to be a viable treatment option, based on this investigation with a short-term follow-up. Although only minor differences between the two abutments were observed, patients seem to prefer the ball over the dome abutment.
本初步研究分析了两种基台类型（固位球和非固位穹顶）在 6mm 短种植体上用于种植体支持式可摘局部义齿（IARPD）的临床、影像学和患者报告的结果（PRO），随访期为 1 年。
在下颌磨牙部位双侧植入两颗种植体，将现有的游离端可摘局部义齿（RPD）转换为 IARPD。12 名受试者随机分为两组，最初分别接受穹顶（A 组，n=6）或球基台（B 组，n=6）。8 周后更换基台。8 周后，患者可选择其中一种基台。计算平均值和标准差（SD），并应用随机效应线性回归分析分析边缘骨水平变化和 PRO（α<0.05）。
12 名参与者纳入研究；然而，1 名参与者脱落。两组患者的评分均显著增加。最终，大多数参与者（82%）选择了球基台。种植体的存活率为 100%，种植体放置 12 个月后成功率为 90.9%（平均种植体周围骨丢失：-1.2；SD：0.6mm），两组间在临床和影像学结果方面无统计学差异。
基于这项短期随访研究，在 RPD 佩戴者的下颌磨牙部位植入 6mm 短种植体似乎是一种可行的治疗选择。尽管两种基台之间仅观察到轻微差异，但患者似乎更喜欢球基台而不是穹顶基台。
