Bankoğlu Güngör Merve, Yılmaz Handan
Lecturer, Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey.
Professor, Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey.
J Prosthet Dent. 2016 Sep;116(3):346-55. doi: 10.1016/j.prosdent.2016.01.022. Epub 2016 Apr 8.
Titanium implants have been successfully used to support fixed dental prostheses. Zirconia implants have been suggested as support for crowns, but information on their use to support partial fixed dental prostheses is limited.
The purpose of this finite element study was to evaluate the maximum principal, minimum principal, and von Mises stresses and their distributions on zirconia and titanium implant-supported, partial fixed dental prostheses located in the anterior maxillary region.
Zirconia and titanium implants (4 mm in diameter and 11. 5 mm in length) and prostheses made from 2 different materials (lithium disilicate and zirconia) were simulated, and 4 models were generated: Titan-IPS, Titan-Lava, Zircon-IPS, and Zircon-Lava. The maxillary bone was modeled as type 3 bone. The load was applied obliquely (534 N) and horizontally (76.5 N), and the stress values and distributions were examined.
Under horizontal loading, stresses generated on the cortical bone in the Zircon models were lower than those in the Titan models. Under oblique loading, stress values were similar in the same implant material and stress type. For all types of stress among the models, the stress values that occurred on the trabecular bone were found to be similar under both horizontal and oblique loading. The maximum stress values on the bones, implants, cores, and veneers did not exceed the strength of the structures.
Different stress values resulted from the different implant types. The prosthetic materials did not change the stress distributions in bone.
钛种植体已成功用于支持固定义齿。氧化锆种植体已被建议用于支持牙冠，但关于其用于支持局部固定义齿的信息有限。
本有限元研究的目的是评估位于上颌前部区域的氧化锆和钛种植体支持的局部固定义齿上的最大主应力、最小主应力和冯·米塞斯应力及其分布。
模拟了氧化锆和钛种植体（直径4mm，长度11.5mm）以及由2种不同材料（二硅酸锂和氧化锆）制成的义齿，生成了4种模型：Titan-IPS、Titan-Lava、Zircon-IPS和Zircon-Lava。上颌骨建模为3型骨。以倾斜（534N）和水平（76.5N）方向施加载荷，并检查应力值和分布情况。
在水平加载下，氧化锆模型中皮质骨产生的应力低于钛模型。在倾斜加载下，相同种植体材料和应力类型下的应力值相似。对于模型中的所有应力类型，发现在水平和倾斜加载下，小梁骨上出现的应力值相似。骨骼、种植体、核和贴面的最大应力值未超过结构强度。
不同种植体类型产生不同的应力值。修复材料并未改变骨内的应力分布。
