Elsyad Moustafa A, Eltowery Salem M, Gebreel Ashraf A
Department of Removable Prosthodontics, Faculty of Dentistry, Mansoura University.
J Oral Sci. 2017 Dec 27;59(4):483-490. doi: 10.2334/josnusd.16-0626. Epub 2017 Oct 31.
This study aimed to evaluate the peri-implant strain around mesially inclined implants used to retain mandibular overdentures with Locator resilient attachments. Four mandibular edentulous acrylic resin models received two implants in the canine areas with 0°, 5°, 10°, and 20° mesial inclinations. Overdentures were connected to the implants using Locator attachments. Pink nylon inserts (light retention) were used for all implant inclinations, and red inserts were used for 20° inclination (20°red). Four strain gages were bonded on the mesial (M), distal (D), buccal (B), and lingual (L) surfaces of each implant. Peri-implant strains were measured during bilateral and unilateral loading. The 20° inclination showed the highest strain, followed by 10° and 5°, and both 0° and 20°red presented with the lowest strain. Site D was associated with the highest strain, followed by M, B, and L, which showed the lowest strain values. Unilateral loading and the loading side presented with significantly higher strain values than bilateral loading and the nonloading side, respectively. Hence, in this study, strains around the two-implant-retained overdentures with Locator attachments increased with increases in mesial implant angulation, except when red male inserts were used.
本研究旨在评估使用Locator弹性附件固位下颌覆盖义齿的近中倾斜种植体周围的种植体周应变。四个下颌无牙丙烯酸树脂模型在尖牙区植入两枚种植体，近中倾斜角度分别为0°、5°、10°和20°。使用Locator附件将覆盖义齿连接到种植体上。所有种植体倾斜角度均使用粉色尼龙嵌体（轻度固位），20°倾斜角度使用红色嵌体（20°红色）。在每个种植体的近中（M）、远中（D）、颊侧（B）和舌侧（L）表面粘贴四个应变片。在双侧和单侧加载过程中测量种植体周应变。20°倾斜角度显示出最高应变，其次是10°和5°，0°和20°红色嵌体组呈现出最低应变。D部位的应变最高，其次是M、B和L，L部位的应变值最低。单侧加载和加载侧的应变值分别显著高于双侧加载和非加载侧。因此，在本研究中，除了使用红色阳型嵌体时，使用Locator附件的两枚种植体固位覆盖义齿周围的应变随种植体近中角度的增加而增加。
