Sellan, P.L.B.; Campaner, L.M.; Tribst, J.P.M.; de Oliveira Dal Piva, A.M.; de Andrade, G.S.; Borges, A.L.S.; Bresciani, E.; Lanzotti, A.; Ausiello, P. Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study. Polymers2021, 13, 3831.
Sellan, P.L.B.; Campaner, L.M.; Tribst, J.P.M.; de Oliveira Dal Piva, A.M.; de Andrade, G.S.; Borges, A.L.S.; Bresciani, E.; Lanzotti, A.; Ausiello, P. Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study. Polymers 2021, 13, 3831.
Sellan, P.L.B.; Campaner, L.M.; Tribst, J.P.M.; de Oliveira Dal Piva, A.M.; de Andrade, G.S.; Borges, A.L.S.; Bresciani, E.; Lanzotti, A.; Ausiello, P. Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study. Polymers2021, 13, 3831.
Sellan, P.L.B.; Campaner, L.M.; Tribst, J.P.M.; de Oliveira Dal Piva, A.M.; de Andrade, G.S.; Borges, A.L.S.; Bresciani, E.; Lanzotti, A.; Ausiello, P. Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study. Polymers 2021, 13, 3831.
Abstract
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), non-retentive design with non-functional cusp coverage (NNFC). 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) stresses 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 tooth structure. The resin composite restoration on non-functional cusp is recommended when functional cusp is preserved, in order to associate conservative dentistry and low stress magnitude.
Keywords
dental materials; finite element analysis; prosthodontics; biomechanics
Subject
Medicine and Pharmacology, Dentistry and Oral Surgery
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.