Int J Oral Maxillofac Implants. 2022 Mar-Apr;37(2):391. doi: 10.11607/jomi.8982.
This study aimed to investigate the effect of attachment type, maximum occlusal force, denture deformation, and other confounding factors on marginal bone loss of two-implant overdentures after 1 year.
Ninety edentulous patients received two implants in canine areas of the mandible using the computer-guided flapless surgical technique. Three months later, overdentures were connected to the implants with bar, resilient telescopic, and resilient stud attachments. Marginal bone loss was evaluated using standardized digitized periapical radiographs. Maximum occlusal forces were evaluated using a digital bite-force meter. Denture base deformation (denture strains, μm) was evaluated using strain gauges bonded to the polished surface of the denture at the level of the attachments. Regression analysis was adopted to find the relation between marginal bone loss and the following confounders (age, sex, mandibular bone height, period of edentulism, number of previous dentures, attachment type, maximum occlusal force, and denture strains).
Telescopic overdentures showed the highest marginal bone loss and maximum occlusal force, followed by bar overdentures, and stud overdentures demonstrated the lowest values. The highest denture strains were noted with bar overdentures, followed by telescopic overdentures, and stud overdentures showed the lowest strains. Age (P = .022), mandibular bone height (P = .023), number of previous dentures (P = .004), maximum occlusal force (P ≤ .001), and denture strains (P = .048) were significantly correlated with marginal bone loss. For every 1-year increase in age, there was a decrease in bone loss by 0.3%. For every 1-mm increase in bone height, there was an increase in bone loss by 1%. For every one increase in the number of worn dentures, there was a decrease in bone loss by 4.2%. For every 10-N increase in maximum occlusal force, there was an increase in bone loss by 6.4%. For every 10-μm increase in denture strains, there was an increase in bone loss by 0.21%. Sex, time of edentulism, and attachment type did not demonstrate a significant correlation with marginal bone loss.
本研究旨在探讨附着体类型、最大咬合力、义齿变形及其他混杂因素对经计算机引导无瓣外科技术植入下颌犬齿区的 2 枚种植体 1 年后覆盖义齿边缘骨吸收的影响。
90 名无牙颌患者采用计算机引导无瓣外科技术在下颌犬齿区植入 2 枚种植体。3 个月后，采用杆、弹性伸缩式和弹性球帽附着体将覆盖义齿连接到种植体上。使用标准化数字化根尖射线照相评估边缘骨吸收。使用数字咬合力计评估最大咬合力。使用粘贴在附着体水平义齿抛光表面的应变计（应变片）评估义齿基托变形（义齿应变，μm）。采用回归分析确定边缘骨吸收与以下混杂因素（年龄、性别、下颌骨高度、无牙颌时间、义齿佩戴史、附着体类型、最大咬合力和义齿应变）之间的关系。
伸缩式覆盖义齿的边缘骨吸收和最大咬合力最高，其次是杆式覆盖义齿，而球帽式覆盖义齿的边缘骨吸收和最大咬合力最低。杆式覆盖义齿的义齿应变最大，其次是伸缩式覆盖义齿，而球帽式覆盖义齿的义齿应变最小。年龄（P =.022）、下颌骨高度（P =.023）、义齿佩戴史（P =.004）、最大咬合力（P ≤.001）和义齿应变（P =.048）与边缘骨吸收显著相关。年龄每增加 1 岁，骨吸收减少 0.3%。下颌骨高度每增加 1mm，骨吸收增加 1%。佩戴的义齿数量每增加一个，骨吸收减少 4.2%。最大咬合力每增加 10N，骨吸收增加 6.4%。义齿应变每增加 10μm，骨吸收增加 0.21%。性别、无牙颌时间和附着体类型与边缘骨吸收无显著相关性。
