Purpose To present a digital method that combines intraoral and face scanning for the computer-assisted design/computer-assisted manufacturing (CAD/CAM) fabrication of implant-supported bars for maxillary overdentures. Methods Over a 2-year period, all patients presenting to a private dental clinic with a removable complete denture in the maxilla, seeking rehabilitation with implants, were considered for inclusion in this study. Inclusion criteria were fully edentulous maxilla, functional problems with the preexisting denture, opposing dentition, and sufficient bone volume to insert four implants. Exclusion criteria were age < 55 years, need for bone augmentation, uncompensated diabetes mellitus, immunocompromised status, radio- and/or chemotherapy, and previous treatment with oral and/or intravenous aminobisphosphonates. All patients were rehabilitated with a maxillary overdenture supported by a CAD/CAM polyether-ether-ketone (PEEK) implant-supported bar. The outcomes of the study were the passive fit/adaptation of the bar, the 1-year implant survival, and the success rates of the implant-supported overdentures. Results 15 patients (6 males, 9 females; mean age 68.8 ± 4.7 years) received 60 implants and were rehabilitated with a maxillary overdenture supported by a PEEK bar, designed and milled from an intraoral digital impression. The intraoral scans were integrated with face scans, in order to design each bar with all available patient data (soft tissues, prosthesis, implants, and face) in the correct spatial position. When testing the 3D-printed resin bar, 12 bars out of 15 (80%) had a perfect passive adaptation and fit; in contrast, 3 out of 15 (20%) did not have a sufficient passive fit or adaptation. No implants were lost, for a 1-year survival of 100% (60/60 surviving implants). However, some complications (two fixtures with peri-implantitis in the same patient and two repaired overdentures in two different patients) occurred. This determined a 1-year success rate of 80% for the implant-supported overdenture. Conclusions In this study, the combination of intraoral and face scans allowed to successfully restore fully edentulous patients with maxillary overdentures supported by 4 implants and a CAD/CAM PEEK bar. Further studies are needed to confirm these outcomes.

中文翻译：

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结合口内和面部扫描设计和制造计算机辅助设计/计算机辅助制造 (CAD/CAM) 聚醚-醚-酮 (PEEK) 种植体支持的上颌覆盖义齿棒

目的 介绍一种结合口内和面部扫描的数字方法，用于上颌覆盖义齿的种植体支撑杆的计算机辅助设计/计算机辅助制造 (CAD/CAM) 制造。方法 在 2 年的时间里，所有到私人牙科诊所就诊的上颌可摘全口义齿寻求种植体康复的患者都被考虑纳入本研究。入选标准是上颌完全无牙颌、现有义齿的功能问题、对立牙列以及足够的骨量以插入四个种植体。排除标准是年龄 < 55 岁、需要骨增强、未代偿性糖尿病、免疫功能低下状态、放疗和/或化疗，以及既往使用口服和/或静脉注射氨基双膦酸盐治疗。所有患者均使用由 CAD/CAM 聚醚-醚-酮 (PEEK) 种植体支撑杆支撑的上颌覆盖义齿进行修复。研究的结果是棒的被动配合/适应、1 年的种植体存活率以及种植体支持的覆盖义齿的成功率。结果 15 名患者（6 名男性，9 名女性；平均年龄 68.8 ± 4.7 岁）接受了 60 颗种植体，并使用由 PEEK 棒支撑的上颌覆盖义齿进行修复，该义齿由口内数字印模设计和研磨。口内扫描与面部扫描相结合，以便在正确的空间位置设计具有所有可用患者数据（软组织、假体、植入物和面部）的每个条。在测试 3D 打印树脂条时，15 条中有 12 条（80%）具有完美的被动适应和贴合性；相比之下，15 人中有 3 人（20%）没有足够的被动适应或适应能力。没有种植体丢失，1 年存活率为 100%（60/60 的存活种植体）。然而，发生了一些并发症（同一患者的两个种植体周围炎固定装置和两个不同患者的两个修复的覆盖义齿）。这确定了种植体支持的覆盖义齿的 1 年成功率为 80%。结论 在这项研究中，口内扫描和面部扫描相结合，可以成功修复由 4 个种植体和一个 CAD/CAM PEEK 杆支撑的上颌覆盖义齿的全缺牙患者。需要进一步的研究来证实这些结果。发生了一些并发症（同一患者的两个种植体周围炎固定装置和两个不同患者的两个修复的覆盖义齿）。这确定了种植体支持的覆盖义齿的 1 年成功率为 80%。结论 在这项研究中，口内扫描和面部扫描相结合，可以成功修复由 4 个种植体和一个 CAD/CAM PEEK 杆支撑的上颌覆盖义齿的全缺牙患者。需要进一步的研究来证实这些结果。发生了一些并发症（同一患者的两个种植体周围炎固定装置和两个不同患者的两个修复的覆盖义齿）。这确定了种植体支持的覆盖义齿的 1 年成功率为 80%。结论 在这项研究中，口内扫描和面部扫描相结合，可以成功修复由 4 个种植体和一个 CAD/CAM PEEK 杆支撑的上颌覆盖义齿的全缺牙患者。需要进一步的研究来证实这些结果。