The role of superstructure material on the stress distribution in mandibular full-arch implant-supported fixed dentures. A CT-based 3D-FEA

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• 作者：Mayara Barbosa Ferreira ; Valentim Adelino Bar茫o ; Leonardo Perez Faverani ; Ana Carolina Hip贸lito ; Wirley Gon莽alves Assun莽茫o
• 关键词：Finite element analysis ; Implant-supported fixed dentures ; Infrastructure
• 刊名：Materials Science and Engineering: C
• 出版年：1 February, 2014
• 年：2014
• 卷：35
• 期：Complete
• 页码：92-99
• 全文大小：1469 K

文摘

This study evaluated the stress distribution in mandibular full-arch implant-supported fixed dentures with different veneering and metallic infrastructure materials, using three-dimensional finite element analysis. Ten models were obtained from an edentulous human mandible with a complete denture fixed by four implants. Acrylic resin (RES) and porcelain (POR) teeth were associated with infrastructures of titanium (Ti), gold (Au), silver-palladium (AgPd), chrome-cobalt (CoCr) and nickel-chrome (NiCr). A 100-N oblique was applied. The von Mises (蟽vM) and maximum (蟽max) and minimum (蟽min) principal stresses were obtained. The RES-AgPd group showed the lowest 蟽vM values, while the RES-Ni-Cr group showed the highest. In the bone tissue, the RES-Au group was the only one that showed different 蟽max values with a 12% increase in comparison to the other groups which had similar stress values. In the implants, the groups with Ti, Au and AgPd infrastructures, either with porcelain or resin teeth, showed 蟽vM values similar and lower in comparison to the groups with CoCr and NiCr infrastructures. The tooth veneering material influenced the stress values in metallic infrastructures, in which the acrylic resin had the highest values. The veneering and infrastructure materials have influence on stress values of implant-supported dentures, except for the peri-implant bone tissue.