ObjectivesTo evaluate the survival rates and marginal bone loss of narrow‐diameter titanium‐zirconium implants supporting complete maxillary and mandibular overdentures up to 3 years after loading.Materials and MethodsTen completely edentulous patients who were dissatisfied with their complete dentures were enrolled. Two narrow‐diameter implants were placed in the canine region of the maxilla and mandible. After second‐stage surgery, implant‐supported overdentures (palatal‐free) attached by parallel alignable stud‐attachments were placed. Patients were followed periodically for up to 36 months. Standardized radiographs were taken at baseline, 12 and 36 months to analyze mean marginal bone level changes around the implants.ResultsThe Kaplan–Meier survival rates were 100% for mandibular and 68.0% (SE ± 10.9%) for maxillary implants at 36 months (p = .008). Six maxillary implants failed after loading; no mandibular implants were lost. Five implants failed due to loss of osseointegration. One implant fractured. The mean marginal bone level changes around the analyzed implants (n = 28, 9 patients) were −0.71 ± 0.82 mm in the mandible and −2.08 ± 1.52 mm in the maxilla at the 36‐month follow‐up. The difference in marginal bone level changes between the maxilla and mandible was significant (p = .019) at the 12‐ and 36‐month follow‐ups.ConclusionTwo narrow‐diameter titanium‐zirconium implants with stud‐attachments showed a highly satisfactory outcome in the mandible. The maxillary implants showed a high failure rate and significantly more bone loss over time than the mandibular implants. The minimal concept of two implants and an overdenture should be limited to the edentulous mandible.

中文翻译：

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由两个无夹板窄直径钛锆种植体保留的上颌和下颌覆盖义齿 - 一项临床试点研究


目的 评估支持全口上颌和下颌覆盖义齿的窄直径钛锆种植体加载后 3 年内的存活率和边缘骨丢失。 材料与方法 纳入 10 名对全口义齿不满意的全口无牙颌患者。两个窄直径种植体被放置在上颌骨和下颌骨的尖牙区域。第二阶段手术后，放置种植体支持的覆盖义齿（无腭），并通过平行可对齐螺柱附着体连接。对患者进行长达 36 个月的定期随访。在基线、12 个月和 36 个月时拍摄标准化射线照片，以分析种植体周围的平均边缘骨水平变化。结果 36 个月时，下颌种植体的 Kaplan-Meier 存活率为 100%，上颌种植体的 Kaplan-Meier 存活率为 68.0% (SE ± 10.9%) (p =.008）。六颗上颌种植体在负重后失效；没有丢失下颌种植体。五个种植体因骨整合丧失而失败。一颗植入物断裂。在 36 个月的随访中，所分析种植体周围的平均边缘骨水平变化（n = 28，9 名患者）下颌骨为 -0.71 ± 0.82 毫米，上颌骨为 -2.08 ± 1.52 毫米。在 12 个月和 36 个月的随访中，上颌骨和下颌骨的边缘骨水平变化差异显着 (p = .019)。 结论 两种带螺柱附着体的窄直径钛锆种植体在治疗中显示出非常令人满意的结果下颌骨。与下颌种植体相比，上颌种植体随着时间的推移显示出较高的失败率和明显更多的骨丢失。两个种植体和覆盖义齿的最小概念应仅限于无牙颌下颌。