Department of Oral and Maxillofacial Surgery and Oral Medicine, Malmö University, Malmö, Sweden.
Department of Prosthodontics, Malmö University, Malmö, Sweden.
Clin Implant Dent Relat Res. 2019 Apr;21(2):238-246. doi: 10.1111/cid.12717. Epub 2019 Jan 28.
Screw-retained fixed partial dentures (FPD) have shown a lower incidence of biologic complications and an easier retrievability compared with cemented FPD.
To compare the marginal bone loss at conical connection implant restored with a screw retained cobalt-chrome FPD in an implant-level (IL) or an abutment-level (AL) setup.
Patients with at least two adjacent missing teeth were randomly allocated to be restored with IL or AL FPD. Periapical radiographs and clinical examination were taken at implant placement, prosthetic connection, 6 and 12 months to evaluate marginal bone loss (MBL), and soft tissue conditions. Complications were used to calculate prognostic indexes.
Fifty patients were treated with 50 FPD supported by 119 implants. The difference of MBL between the IL and AL groups was statistically significant (P = 0.003). At 1 year, MBL was 0.086 ± 0.313 mm and 0.005 ± 0.222 mm in the IL and AL groups, respectively. The presence of BoP increased with time in IL, whereas it decreased in AL group (P < 0.001). A minor complication was encounted in one FPD.
A low grade of MBL was present after 1 year. IL showed greater amount of MBL and soft tissue inflammation indexes than AL. In FPD, AL may be a safer procedure than IL setup in order to preserve a healthy periimplant tissue.
与黏接固定义齿相比，螺丝固位固定义齿（FPD）的生物学并发症发生率较低，且更容易取出。
比较螺丝固位钴铬合金 FPD 在种植体水平（IL）或基台水平（AL）修复时的锥形连接种植体的边缘骨丧失。
将至少有两颗相邻缺失牙的患者随机分配为 IL 或 AL FPD 修复。在种植体植入、修复体连接时以及 6 个月和 12 个月拍摄根尖片和临床检查，以评估边缘骨丧失（MBL）和软组织状况。并发症用于计算预后指数。
50 名患者接受了 50 个 FPD 的治疗，这些 FPD 由 119 个种植体支撑。IL 和 AL 组之间的 MBL 差异具有统计学意义（P=0.003）。在 1 年时，IL 组和 AL 组的 MBL 分别为 0.086±0.313mm 和 0.005±0.222mm。IL 组的探诊出血（BoP）随时间增加，而 AL 组的 BoP 随时间减少（P<0.001）。一个 FPD 出现轻微并发症。
1 年后 MBL 程度较低。IL 组的 MBL 和软组织炎症指数大于 AL 组。在 FPD 中，为了保持健康的种植体周围组织，AL 可能比 IL 更安全。
