Pietro Ausiello1, Stefano Ciaramella2, Alessandra Di Rienzo3, Antonio Lanzotti2, Maurizio Ventre4, David C Watts5. 1. Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Italy. Electronic address: pietro.ausiello@unina.it. 2. Department of Industrial Engineering, Fraunhofer JL IDEAS - University of Naples Federico II, Italy. 3. Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples Federico II, Italy. 4. Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II & Center for Advanced Biomaterials for HealthCare@CRIB, Istituto Italiano di Tecnologia, Naples, Italy. 5. School of Medical Sciences and Photon Science Institute, University of Manchester, United Kingdom.
Abstract
OBJECTIVES: To investigate the influence of different resin composite and glass ionomer cement material combinations in a "bi-layer" versus a "single-layer" adhesive technique for class I cavity restorations in molars using numerical finite element analysis (FEA). MATERIALS AND METHODS: Three virtual restored lower molar models with class I cavities 4mm deep were created from a sound molar CAD model. A combination of an adhesive and flowable composite with bulk fill composite (model A), of a glass ionomer cement with bulk fill composite (model B) and of an adhesive with bulk fill composite (model C), were considered. Starting from CAD models, 3D-finite element (FE) models were created and analyzed. Solid food was modeled on the occlusal surface and slide-type contact elements were used between tooth surface and food. Polymerization shrinkage was simulated for the composite materials. Physiological masticatory loads were applied to these systems combined with shrinkage. Static linear analyses were carried out. The maximum normal stress criterion was adopted as a measure of potential damage. RESULTS: All models exhibited high stresses principally located along the tooth tissues-restoration interfaces. All models showed a similar stress trend along enamel-restoration interface, where stresses up to 22MPa and 19MPa was recorded in the enamel and restoration, respectively. A and C models showed a similar stress trend along the dentin-restoration interface with a lower stress level in model A, where stresses up to 11.5MPa and 7.5MPa were recorded in the dentin and restoration, respectively, whereas stresses of 17MPa and 9MPa were detected for model C. In contrast to A and C models, the model B showed a reduced stress level in dentin, in the lower restoration layer and no stress on the cavity floor. SIGNIFICANCE: FE analysis supported the positive effect of a "bi-layer" restorative technique in a 4mm deep class I cavities in lower molars versus "single-layer" bulk fill composite technique.
OBJECTIVES: To investigate the influence of different resin composite and glass ionomer cement material combinations in a "bi-layer" versus a "single-layer" adhesive technique for class I cavity restorations in molars using numerical finite element analysis (FEA). MATERIALS AND METHODS: Three virtual restored lower molar models with class I cavities 4mm deep were created from a sound molar CAD model. A combination of an adhesive and flowable composite with bulk fill composite (model A), of a glass ionomer cement with bulk fill composite (model B) and of an adhesive with bulk fill composite (model C), were considered. Starting from CAD models, 3D-finite element (FE) models were created and analyzed. Solid food was modeled on the occlusal surface and slide-type contact elements were used between tooth surface and food. Polymerization shrinkage was simulated for the composite materials. Physiological masticatory loads were applied to these systems combined with shrinkage. Static linear analyses were carried out. The maximum normal stress criterion was adopted as a measure of potential damage. RESULTS: All models exhibited high stresses principally located along the tooth tissues-restoration interfaces. All models showed a similar stress trend along enamel-restoration interface, where stresses up to 22MPa and 19MPa was recorded in the enamel and restoration, respectively. A and C models showed a similar stress trend along the dentin-restoration interface with a lower stress level in model A, where stresses up to 11.5MPa and 7.5MPa were recorded in the dentin and restoration, respectively, whereas stresses of 17MPa and 9MPa were detected for model C. In contrast to A and C models, the model B showed a reduced stress level in dentin, in the lower restoration layer and no stress on the cavity floor. SIGNIFICANCE: FE analysis supported the positive effect of a "bi-layer" restorative technique in a 4mm deep class I cavities in lower molars versus "single-layer" bulk fill composite technique.
Authors: Pietro Ausiello; Amanda Maria de Oliveira Dal Piva; Alessandro Espedito di Lauro; Franklin Garcia-Godoy; Luca Testarelli; João Paulo Mendes Tribst Journal: Polymers (Basel) Date: 2022-04-07 Impact factor: 4.967
Authors: Enrico Salvati; Cyril Besnard; Robert A Harper; Thomas Moxham; Richard M Shelton; Gabriel Landini; Alexander M Korsunsky Journal: J Adv Res Date: 2020-09-06 Impact factor: 10.479
Authors: Luigi Giovanni Bernardo Sichi; Fernanda Zapater Pierre; Laura Viviana Calvache Arcila; Guilherme Schmitt de Andrade; João Paulo Mendes Tribst; Pietro Ausiello; Alessandro Espedito di Lauro; Alexandre Luiz Souto Borges Journal: Molecules Date: 2021-10-10 Impact factor: 4.411
Authors: João Paulo Mendes Tribst; Dayana Campanelli de Morais; Jefferson David Melo de Matos; Guilherme da Rocha Scalzer Lopes; Amanda Maria de Oliveira Dal Piva; Alexandre Luiz Souto Borges; Marco Antonio Bottino; Antonio Lanzotti; Massimo Martorelli; Pietro Ausiello Journal: Dent J (Basel) Date: 2022-01-14