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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


Journal of Dental Health, Oral Disorders & Therapy
Leonardo Jiro Nomura Nakano,1 João Paulo Mendes Tribst,2 Amanda Maria de Oliveira Dal Piva,1 Alexandre Luiz Souto Borges,1 Tarcisio José de Arruda Paes Junior1

Abstract

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.

Keywords

Resin-bonded denture, nylon, composite resins, finite element analysis, dental materials

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