Private practice in oral implantology, Vitoria, Spain.
UIRMI (UPV/EHU-Fundación Eduardo Anitua), University Institute for Regenerative Medicine and Oral Implantology, Vitoria, Spain.
J Prosthodont. 2019 Feb;28(2):e688-e693. doi: 10.1111/jopr.12761. Epub 2018 Jan 28.
The purpose of this retrospective clinical study was to assess the influence of immediate loading and lengths of splinted implants on the clinical effectiveness of 6.5-mm-long implants supporting two-implant fixed prostheses in the premolar-molar regions.
A clinical database was reviewed in a private dental center to select those patients who had 6.5-mm-long implants placed to support two-implant fixed partial prostheses in the premolar-molar regions of the maxilla and the mandible. All implants were immediately loaded. The study groups were defined according to the lengths of the implants. Two groups were identified: the short-short splinted group, when both implants had 6.5 mm lengths, and the short-long splinted group, when one implant was longer than 6.5 mm. A total of 48 dental implants were placed in 16 patients to support 24 two-implant fixed prostheses. The mean follow-up time was 14 ± 5 months. The short-short splinted group included 8 patients with 16 implants; the short-long splinted group included 16 patients with 32 implants. The main variable was implant survival, and secondary outcomes were marginal bone stability and prosthesis survival.
The statistical analyses indicated an absence of significant differences between the two groups in terms of implant and prosthesis survival (100% for both groups and both variables); however, distal bone loss around the splinted implants was significantly higher in the short-long splinted group. Bone loss was 0.37 ± 0.55 mm in the short-short splinted group and 0.94 ± 0.66 mm in the short-long splinted group.
Immediate loading of short (6.5-mm-long) implants in the premolar-molar regions did not jeopardize their survival. Two-implant supported prostheses had the same clinical effectiveness, whether extra-short implants were splinted to another extra-short implant or to a longer one.
本回顾性临床研究旨在评估即刻负载和夹板种植体长度对 6.5mm 长种植体支持前磨牙-磨牙区两段式种植体固定修复体临床效果的影响。
在一家私人牙科中心的临床数据库中进行回顾性研究，选择上颌和下颌前磨牙-磨牙区植入 6.5mm 长种植体以支持两段式种植体固定局部修复体的患者。所有种植体均即刻负载。根据种植体长度将研究组分为两组：当两个种植体长度均为 6.5mm 时为短-短夹板组，当一个种植体长度大于 6.5mm 时为短-长夹板组。共有 16 名患者的 48 颗种植体植入以支持 24 个两段式种植体固定修复体。平均随访时间为 14±5 个月。短-短夹板组包括 8 名患者的 16 个种植体；短-长夹板组包括 16 名患者的 32 个种植体。主要变量为种植体存活率，次要结局变量为边缘骨稳定性和修复体存活率。
统计分析表明，两组种植体和修复体存活率均无显著差异（两组均为 100%；两个变量均为 100%）；然而，短-长夹板组夹板种植体的远中骨丧失显著更高。短-短夹板组的骨丧失为 0.37±0.55mm，短-长夹板组的骨丧失为 0.94±0.66mm。
即刻负载 6.5mm 长种植体在前磨牙-磨牙区不会影响其存活率。两段式种植体支持的修复体具有相同的临床效果，无论短种植体是否与另一短种植体或长种植体夹板固定。
