OBJECTIVES The objective of this study is to analyze the clinical and radiographic outcomes of implant-supported fixed protheses with cantilever extensions (ISFPCs) in the partially edentulous anterior mandible. MATERIALS AND METHODS Patients who received anterior mandible implant restoration between January 2016 and December 2021 were included. Patients with two, three, or four continuous missing teeth receiving adjacent implant supported single-unit crowns (ISSCs), ISFPCs, implant-supported fixed protheses without cantilever extensions (ISFPNs) were divided into groups: ISSC+ISSC, ISFPC, ISSC+ISFPC, three-unit ISFPN, ISFPC+ISFPC, or four-unit ISFPN, respectively. We recorded and evaluated survival rates, mechanical and biological complications, peri-implant marginal bone loss (MBL), esthetic outcomes, and patient perceptions. Statistical analysis was performed using linear mixed models (LMM). RESULTS The study included 87 patients and 152 implants. No implant loss occurred during an average follow-up of 3.48 ± 1.85 years (range: 1-7 years). According to LMM models, prosthetic type had a statistically significant impact on MBL during follow-up periods, in favor of the ISFPC and ISFPC+ISFPC groups (0.16 ± 0.48 mm vs. 0.51 ± 0.49 mm, p = .034; 0.22 ± 0.49 mm vs. 0.60 ± 0.62 mm, p = .043, respectively). Mechanical and biological complications were relatively low and comparable. The four-unit ISFPC group had higher subjective esthetic scores compared with the ISSC+ISSC group (98.6 vs. 83.8, p < .05), and patients in the ISFPC+ISFPC group expressed greater satisfaction with cleanability than the ISFPN group (98.8 vs. 80.6). CONCLUSION ISFPCs offer a highly predictable treatment option in the anterior mandible, characterized by high survival rates, and comparable complication rates, peri-implant bone stability and esthetics to adjacent ISSCs or ISFPNs.

中文翻译：

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下颌前牙悬臂延伸种植体支持固定修复体的临床和放射学结果：一项回顾性研究。


目的 本研究的目的是分析部分无牙颌前牙种植体支持的悬臂延伸固定修复体 (ISFPC) 的临床和影像学结果。材料和方法 纳入 2016 年 1 月至 2021 年 12 月期间接受下颌前牙种植修复的患者。将两颗、三颗或四颗连续缺失牙齿接受相邻种植体支持的单牙冠 (ISSC)、ISFPC、种植体支持的无悬臂延伸固定修复体 (ISFPN) 的患者分为几组：ISSC+ISSC、ISFPC、ISSC+ISFPC 、三单元 ISFPN、ISFPC+ISFPC 或四单元 ISFPN。我们记录并评估了存活率、机械和生物并发症、种植体周围边缘骨丢失 (MBL)、美学结果和患者的感受。使用线性混合模型（LMM）进行统计分析。结果 该研究包括 87 名患者和 152 个种植体。平均随访 3.48 ± 1.85 年（范围：1-7 年），未发生种植体丢失。根据 LMM 模型，修复体类型在随访期间对 MBL 有统计学上的显着影响，有利于 ISFPC 和 ISFPC+ISFPC 组（0.16 ± 0.48 mm 与 0.51 ± 0.49 mm，p = .034；0.22 ± 0.49 mm 与 0.60 ± 0.62 mm，分别为 p = .043）。机械和生物并发症相对较低且具有可比性。与 ISSC+ISSC 组相比，四单元 ISFPC 组的主观审美评分更高（98.6 vs. 83.8，p < .05），ISFPC+ISFPC 组的患者对清洁性的满意度高于 ISFPN 组（98.8）对比 80.6）。 结论 ISFPC 为下颌前牙提供了一种高度可预测的治疗选择，其特点是生存率高，并发症发生率、种植体周围骨稳定性和美观程度与邻近 ISSC 或 ISFPN 相当。