Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Oral Biology, Faculty of Dentistry, Cairo University, Cairo, Egypt.
J Prosthodont. 2023 Jul;32(6):e129-e138. doi: 10.1111/jopr.13702. Epub 2023 Jun 10.
To investigate the significance of the connector type on stress dissemination within the tooth-implant-supported fixed dental prostheses in the mandibular posterior region with different combinations of implant diameter and length by means of finite element analysis (FEA).
Six models of different designs for tooth-implant fixed dental prosthesis (FDPs) were simulated and divided into two main groups. Implant lengths were 10, 11.5, and 13 mm while implant diameters were 3.7, 4.7, and 5.7 mm. The main difference between the groups was the connector type. Models were evaluated using 3D FEA (Solidworks Premium 2018 × 64 Edition). Group A tooth-implant FDPs (5.7 mm × 10 mm) had a mesial and distal rigid connector while group B tooth-implant FDPs (3.7 mm × 10 mm, 3.7 mm × 11.5 mm, 3.7 mm × 13 mm, 4.7 mm × 10 mm and 5.7 mm × 10 mm) had a mesial non-rigid connector in their design between the pontic and the tooth. Models were analyzed to determine the magnitude of von Misses Stresses at six specific zones (fixed dental prosthesis, bone around distal implant, bone around tooth, cementum, periodontal ligament, implant) under vertical occlusal loading of 100 N after meshing and assigning the material properties.
Stress values around the supporting bone were significantly higher in Group B (tooth-implant FDP with non-rigid connection) when compared to Group A (tooth-implant FDP with rigid connection). Also, the stresses measured at the FDP level showed that the rigid connection group (5.7 mm × 10 mm) exhibited 26% lower stress values when compared to the non-rigid group (5.7 mm × 10 mm).
Implant-tooth FDPs with rigid connector design using the combination of implant diameter and length (5.7 mm × 10 mm) demonstrated a better design modality thus predicting a higher success rate and more longevity than using the non-rigid connection option.
通过有限元分析（FEA）研究不同直径和长度种植体组合的下颌后牙区牙-种植体支持式固定义齿中，连接体类型对牙-种植体-义齿复合体中应力分布的意义。
模拟了六种不同设计的牙-种植体固定义齿（FDP）模型，并分为两组。种植体长度分别为 10、11.5 和 13mm，种植体直径分别为 3.7、4.7 和 5.7mm。两组的主要区别在于连接体类型。模型采用三维有限元分析（Solidworks Premium 2018×64 版）进行评估。A 组牙-种植体 FDP（5.7mm×10mm）采用近远中刚性连接体，B 组牙-种植体 FDP（3.7mm×10mm、3.7mm×11.5mm、3.7mm×13mm、4.7mm×10mm 和 5.7mm×10mm）在设计中采用近中不刚性连接体，在桥体和基牙之间。在网格划分和分配材料属性后，对模型进行分析，以确定在 100N 垂直咬合载荷下六个特定区域（固定义齿、远侧种植体周围骨、基牙周围骨、牙骨质、牙周膜、种植体）的 von Misses 应力量值。
与 A 组（刚性连接的牙-种植体 FDP）相比，B 组（非刚性连接的牙-种植体 FDP）的支持骨周围的应力量值显著更高。此外，在 FDP 水平测量的应力量表明，与非刚性组（5.7mm×10mm）相比，刚性连接组（5.7mm×10mm）的应力量值降低了 26%。
使用种植体直径和长度组合（5.7mm×10mm）的刚性连接设计的牙-种植体 FDP 显示出更好的设计方式，因此比使用非刚性连接选项预测更高的成功率和更长的使用寿命。
