Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study
Pablo Lenin Benitez Sellan,
Larissa Mendes Campaner,
João Paulo Mendes Tribst,
Amanda Maria de Oliveira Dal Piva,
Guilherme Schmitt de Andrade,
Alexandre Luiz Souto Borges,
Eduardo Bresciani,
Antonio Lanzotti,
Pietro Ausiello
Affiliations
Pablo Lenin Benitez Sellan
School of Dentistry, Universidad Espíritu Santo, Samborondón 092301, Ecuador
Larissa Mendes Campaner
Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, São Paulo 12220-690, Brazil
João Paulo Mendes Tribst
Department of Dental Materials, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands
Amanda Maria de Oliveira Dal Piva
Department of Dental Materials, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands
Guilherme Schmitt de Andrade
Department of Dentistry, Center for Biological and Health Sciences, Western Paraná State University (Unioeste), Cascavel 85819-110, Brazil
Alexandre Luiz Souto Borges
Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, São Paulo 12220-690, Brazil
Eduardo Bresciani
Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, São Paulo 12220-690, Brazil
Antonio Lanzotti
Fraunhofer JL IDEAS, Department of Industrial Engineering, University of Naples Federico II, 80125 Naples, Italy
Pietro Ausiello
School of Dentistry, University of Naples Federico II, 80131 Naples, Italy
Evidence regarding the effect of the onlay preparation design for different CAD/CAM restorative materials considering the preservation of cusps is lacking. Molars were 3D-modeled in four preparation designs for onlay restoration: traditional design with functional cusp coverage (TFC), non-retentive design with functional cusp coverage (NFC), traditional design with non-functional cusp coverage (TNFC) and non-retentive design with non-functional cusp coverage (NNFC). The restorations were simulated with two CAD/CAM restorative materials: LD—lithium disilicate (IPS e.max CAD) and RC—resin composite (GrandioBloc). A 100 N axial load was applied to the occlusal surface, simulating the centric contact point. Von Mises (VM) and maximum principal (Pmax) stress were evaluated for restorations, cement layer and dental substrate. The non-retentive preparation design reduced the stress concentration in the tooth structure in comparison to the conventional retentive design. For LD onlays, the stress distribution on the restoration intaglio surface showed that the preparation design, as well as the prepared cusp, influenced the stress magnitude. The non-retentive preparation design provided better load distribution in both restorative materials and more advantageous for molar structure. The resin composite restoration on thenon-functional cusp is recommended when the functional cusp is preserved in order to associate conservative dentistry and low-stress magnitude.
