El Mekawy Nesreen, Elhawary Mohamed-Yosry
BDS, MSc, Phd. Associate professor of Removable Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Clinical Demonstrator of Oral and Maxillofacial Surgery, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
J Clin Exp Dent. 2019 Jan 1;11(1):e33-e41. doi: 10.4317/jced.55433. eCollection 2019 Jan.
This study was aimed to evaluate the influence of inter-implant distance on the wear characteristics of low-profile stud attachments used in mandibular implant retained overdentures.
Forty Completely edentulous participants aged between 50 - 70 years were enrolled in this study. Each patient received 2-implants by 2-stage submerged surgical protocol. Participants categorized into 4-groups. Group I: 19 mm inter-implant distance with Locator retained overdentures; Group II: 19 mm inter-implant distance with OT Equator retained overdentures; Group III: 25 mm inter-implant distance with Locator retained overdentures; Group IV: 25 mm inter-implant distance with OT Equator retained overdentures. The female housings of each attachment were picked up to the mandibular overdenture. 12 month later the male inserts were replaced by new one. The used retentive male inserts were examined by Stereomicroscopic.
Stereomicroscopic examination revealed wear were detected on both inner surface and, the core of male inserts. Comparison between the unused and the used Locator and OT equator retentive male inserts at various inter-implant distance revealed highly significant wear changes between them at either 19 mm, or 25 mm inter-implant distance P1= .000, P2=.000 respectively.
After one year of implant overdenture clinical use; both locator and OT equator retentive male inserts revealed significant surface deformities and wear. Wear were more notable on both locator and OT equator retentive male inserts with 25 mm interimplant distance than with 19 mm interimplant distance. Inter-implant distance, attachments wear, locator retentive male inserts, OT equator retentive male inserts.
本研究旨在评估种植体间距离对下颌种植体支持覆盖义齿中使用的低轮廓柱形附着体磨损特性的影响。
本研究纳入了40名年龄在50 - 70岁之间的全口无牙患者。每位患者通过两阶段潜入式手术方案植入2枚种植体。参与者被分为4组。第一组：种植体间距离为19 mm，使用Locator附着体支持覆盖义齿；第二组：种植体间距离为19 mm，使用OT Equator附着体支持覆盖义齿；第三组：种植体间距离为25 mm，使用Locator附着体支持覆盖义齿；第四组：种植体间距离为25 mm，使用OT Equator附着体支持覆盖义齿。将每个附着体的阴性部件安装在下颌覆盖义齿上。12个月后，将阳性部件更换为新的。使用体视显微镜检查用过的阳性部件。
体视显微镜检查发现阳性部件的内表面和核心均有磨损。在不同种植体间距离下，未使用的与使用过的Locator和OT Equator阳性部件之间的比较显示，在种植体间距离为19 mm或25 mm时两者之间均有高度显著的磨损变化，P1 = .000，P2 = .000。
种植覆盖义齿临床使用一年后；Locator和OT Equator阳性部件均出现明显的表面变形和磨损。种植体间距离为25 mm时，Locator和OT Equator阳性部件的磨损比种植体间距离为19 mm时更明显。种植体间距离、附着体磨损、Locator阳性部件、OT Equator阳性部件。
