Photoelastic analysis of mandibular full-arch implant-supported fixed dentures made with different bar materials and manufacturing techniques
Photoelastic analysis of mandibular full-arch implant-supported fixed dentures made with different bar materials and manufacturing techniques
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DOI：
10.1016/j.msec.2017.07.052
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发表时间：
2017-12-01
影响因子：
7.9
通讯作者：
Chiarello de Mattos, Maria da Gloria
中科院分区：
文献类型：
--
作者：
Zaparolli, Danilo;Peixoto, Raniel Fernandes;Chiarello de Mattos, Maria da Gloria
目的：通过定性光弹性分析比较不同杆材和不同制作工艺的下颌种植全口义齿的应力分布。材料和方法：制作模拟下颌牙弓的亚克力模型，制作4个4.5×6 mm的Morse锥形种植体模型。根据不同的材料和工艺制造了四种不同的棒材：纤维增强树脂(G1、Trina、CAD/CAM)、商业纯钛(G2、cpTi、CAD/CAM)、钴铬(G3、Co-Cr、CAD/CAM)和钴铬(G4、Co-Cr，常规铸造)。一位经验丰富的牙科技师使用标准的临床和实验室程序制作了4颗下颌种植义齿。光弹模型是在丙烯酸主模型的基础上创建的。结果：纤维增强树脂棒(G1)义齿具有较好的应力分布。加工钴铬条(G3)义齿的应力分布最差，后牙种植体远中超载，其次是铸造钴铬条义齿(G4)和机械加工钴铬条义齿(G2)。结论：纤维增强树脂条具有良好的应力分布，可作为下颌种植义齿修复的一种可行选择。此外，G1组的使用提供了包括减轻重量和较少可能的种植体部件超载的优点，从而使支撑结构得以保存。
Purpose: To compare the stress distribution of mandibular full dentures supported with implants according to the bar materials and manufacturing techniques using a qualitative photoelastic analysis.Material and methods: An acrylic master model simulating the mandibular arch was fabricated with four Morse taper implant analogs of 4.5 x 6 mm. Four different bars were manufactured according to different material and techniques: fiber-reinforced resin (G1, Trinia, CAD/CAM), commercially pure titanium (G2, cpTi, CAD/CAM), cobalt-chromium (G3, Co-Cr, CAD/CAM) and cobalt-chromium (G4, Co-Cr, conventional cast). Standard clinical and laboratory procedures were used by an experienced dental technician to fabricate 4 mandibular implant supported dentures. The photoelastic model was created based on the acrylic master model. A load simulation (150 N) was performed in total occlusion against the antagonist.Results: Dentures with fiber-reinforced resin bar (G1) exhibited better stress distribution. Dentures with machined Co-Cr bar (G3) exhibited the worst standard of stress distribution, with an overload on the distal part of the posteriors implants, followed by dentures with cast Co-Cr bar (G4) and machined cpTi bar (G2).Conclusion: The fiber-reinforced resin bar exhibited an adequate stress distribution and can serve as a viable alternative for oral rehabilitation with mandibular full dentures supported with implants. Moreover, the use of the G1 group offered advantages including reduced weight and less possible overload to the implants components, leading to the preservation of the support structure.