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Maximum fracture load and stress concentration in resin-bonded fixed partial dentures of indirect composite resin reinforced by silica-nylon mesh

2022; MedCrave Group; Volume: 12; Issue: 5 Linguagem: Inglês

10.15406/jdhodt.2021.12.00558

ISSN

2373-4345

Autores

João Paulo Mendes Tribst, Leonardo Jiro Nomura Nakano, Amanda Maria de Oliveira Dal Piva, Alexandre Luiz Souto Borges, Tarcísio José de Arruda Paes,

Tópico(s)

Dental Implant Techniques and Outcomes

Resumo

Objectives: This study aimed to evaluate the maximum fracture load using a silica-nylon reinforcement system on resin-bonded fixed partial dentures (RBFPD) made of indirect composite resin. Methods: An in vitro test simulated an anterior (A) and posterior (P) three-element RBFPD. Thus, 80 specimens were made in 8 experimental groups (n = 10). The groups were divided according to the silica-nylon reinforcement presence (R) and aging (C). The aging process was performed through mechanical cycling for 106 cycles at 4 Hz. The samples were tested by maximum fracture load in a universal testing machine with a 1000 Kgf load cell and analyzed by Stereomicroscope and Scanning Electron Microscopy (SEM). Statistical analysis consisted of analysis of variance (two-way ANOVA) and Tukey test 5%. An in silico study was performed by Finite Element Analysis (FEA), in which the abutment teeth and the prostheses were scanned and transferred to CAD Rhinoceros (version 4.0SR8; McNeel North America, Seattle, WA) for 3D modeling. The analysis test was performed in computer aided engineering software (ANSYS 19.3, Canonsburg, PA, USA). Results: The maximum fracture load results (N) were A=163.55; AC=184.48; AR=198.81; ARC=192.24; P=539.99; PC=359.61; PR=541.74 and PRC=608.74. The Maximum Principal Stress results obtained in the FEA were (MPa): A=53.24/122.40; AR=55.07/117.70; P=33.28/36.18 and PR=28.06/42.87. Significance. It was concluded that the presence of the silica-nylon mesh increased the maximum fracture load of the RBFPD without increasing the stress concentration, regardless of the prosthesis design.

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