Associate Professor, Department Prosthodontics, Presidente Prudente Dental School, University of Western São Paulo - UNOESTE, José Bongiovani St, 700, Presidente Prudente, São Paulo 19050-920, Brazil.
Adjunct Professor, Department of Dental Materials and Prosthodontics, Araçatuba Dental School (UNESP), Univ Estadual Paulista, Araçatuba, Brazil.
Eur J Prosthodont Restor Dent. 2021 Feb 28;29(2):76-83. doi: 10.1922/EJPRD_2098deSouzaBatista08.
This study aimed to assess the effects of splinting in 3-unit implant-supported prostheses with varying the splinting factor, length of the implant, and the diameter of the 1°molar (1°M) implant on cortical bone tissue (CBT). Twelve 3D models were simulated, which represented the posterior maxillary with 3 implants, supporting 3-unit FDP varying the splinting factor (single-unit crowns, splinted crowns straight-line and offset implant configuration [OIC]), length of the implant (7mm and 8,5mm), and the diameter of the 1°M (Ø4 mm and Ø5 mm). The CBT was analyzed by maximum principal stress and microstrain maps. The increase in implant diameter improved the biomechanical behavior of rehabilitation. The increase of the implant diameter in the 1°M associated with OIC generated the best biomechanical behavior for CBT. The splinting was effective in decreasing stress and microstrain, mainly when associated with OIC and implant diameter of Ø5 in the 1°M. The effect of increasing the diameter of the implant referring to the 1°M for single-unit crowns was more effective than the effect of the splinting of implants with Ø4 mm in straight-line. The diameter and splinting factors showed to be more important than implant length to reduce the stress and microstrain on CBT.
本研究旨在评估不同夹板因素、种植体长度和 1°磨牙（1°M）种植体直径对皮质骨组织（CBT）的影响。模拟了 12 个 3D 模型，代表了上颌后牙区的 3 个种植体，支撑着 3 个单位的 FDP，夹板因素不同（单冠、直夹板和偏心种植体配置[OIC]），种植体长度不同（7mm 和 8.5mm），1°M 的直径不同（Ø4mm 和 Ø5mm）。通过最大主应力和微应变图分析 CBT。增加种植体直径改善了修复的生物力学性能。在 1°M 中增加种植体直径并结合 OIC 产生了对 CBT 最佳的生物力学性能。夹板能有效降低应力和微应变，特别是在与 OIC 和 1°M 中 Ø5 直径的种植体结合时。与直夹板的 Ø4mm 种植体相比，增加 1°M 中种植体直径的效果更为显著。直径和夹板因素比种植体长度更重要，可以减少 CBT 上的应力和微应变。
