echanical Behavior of Different Restorative Materials and Onlay Preparation Designs in Endodontically Treated Molar

Author(s)

Gomes de Carvalho, Ana Beatriz ^[1] ; de Andrade, Guilherme Schmitt ^[1] ; Mendes Tribst, Joao Paulo ^[2] ; Grassi, Elisa Donaria Aboucauch ^[1] ; Ausiello, Pietro ^[3] ; Saavedra, Guilherme de Siqueira Ferreira Anzaloni ^[1] ; Bressane, Adriano ^[4] ; Marques de Melo, Renata ^[1] ; Borges, Alexandre Luiz Souto ^[1]

Affiliation

^[1] Sao Paulo State Univ Unesp, Inst Sci & Technol, Dept Dent Mat & Prosthodont, BR-12245000 Sao Jose Dos Campos - Brazil

^[2] Univ Taubate UNITAU, Dept Dent, Grad Program Dent, BR-12020270 Taubate, SP - Brazil

^[3] Univ Naples Federico II, Sch Dent, Dept Neurosci Reprod & Odontostomatol Sci, I-80138 Naples - Italy

^[4] Sao Paulo State Univ Unesp, Inst Sci & Technol, Grad Oral Hlth Appl Sci, BR-12245000 Sao Jose Dos Campos - Brazil

• Document type: Journal article
• Source: ATERIAL; v. 14, n. 8 APR 2021.
• Web of Science Citations: 3

Abstract

This study evaluated the effect of the combination of three different onlay preparation designs and two restorative materials on the stress distribution, using 3D-finite element analysis. Six models of first lower molars were created according to three preparation designs: non-retentive (nRET), traditional with occlusal isthmus reduction (IST), and traditional without occlusal isthmus reduction (wIST); and according to two restorative materials: lithium-disilicate (LD) and nanoceramic resin (NR). A 600 N axial load was applied at the central fossa. All solids were considered isotropic, homogeneous, and linearly elastic. A static linear analysis was performed, and the Maximum Principal Stress (MPS) criteria were used to evaluate the results and compare the stress in MPa on the restoration, cement layer, and tooth structure (enamel and dentin). A novel statistical approach was used for quantitative analysis of the finite element analysis results. On restoration and cement layer, nRET showed a more homogeneous stress distribution, while the highest stress peaks were calculated for LD onlays (restoration: 69-110; cement layer: 10.2-13.3). On the tooth structure, the material had more influence, with better results for LD (27-38). It can be concluded that nRET design showed the best mechanical behavior compared to IST and wIST, with LD being more advantageous for tooth structure and NR for the restoration and cement layer. (AU)

• FAPESP's process: 20/07693-5 - Fatigue survival of bilaminated bioinspired crowns: an in vitro study
• Grantee: Ana Beatriz Gomes de Carvalho
• Support Opportunities: Scholarships in Brazil - Doctorate