Mechanical behavior of conceptual posterior dental crowns with functional elasticity gradient

Author(s)

Penteado, Marcela Moreira ^[1] ; Mendes Tribst, Joao Paulo ^[1] ; de Oliveira Dal Piva, Amanda Maria ^[1] ; Ausiello, Pietro ^[2] ; Zarone, Fernando ^[2] ; Garcia-Godoy, Franklin ^{[3, 4, 5]} ; Souto Borges, Alexandre Luiz ^[1]

Affiliation

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

^[2] Univ Naples Federico II, Sch Dent, Dept Neurosci Reprod & Odontostomatol Sci, Naples - Italy

^[3] Univ Tennessee, Coll Dent, Hlth Sci Ctr, Biosci Res Ctr, Memphis, TN - USA

^[4] Univ Tennessee, Coll Dent, Hlth Sci Ctr, Clin Res Ctr, Memphis, TN - USA

^[5] Forsyth Ctr, Cambridge, MA - USA

• Document type: Journal article
• Source: AMERICAN JOURNAL OF DENTISTRY; v. 32, n. 4, p. 165-168, AUG 2019.
• Web of Science Citations: 0

Abstract

Purpose: To evaluate the biomechanical behavior of monolithic ceramic crowns with functional elasticity gradient. Methods: Using a CAD software, a lower molar received a full-crown preparation (1.5 mm occlusal and axial reduction). The monolithic crown was modeled with a resin cement layer of 0.1 mm. Four groups were distributed according to the full crown elastic modulus (E):(a) Bioinspired crown with decreasing elastic modulus (from 90 to 30GPa); (b) Crown with increasing elastic modulus (from 30 to 90 GPa); (c) Rigid crown (90 GPa) and (d) Flexible crown (30 GPa). The model was exported to the analysis software and meshed into 385.240 tetrahedral elements and 696.310 nodes. Materials were considered isotropic, linearly elastic, and homogeneous, with ideal contacts. A 300-N load was applied at the occlusal surface and the base of the model was fixed in all directions. The results were required in maximum principal stress criterion. Results: Crowns consisting of layers with increasing elastic modulus presented intermediate results between the rigid and flexible crowns. Compared to the flexible crown, the bioinspired crown showed acceptable stress distribution across the structure with lower stress concentration in the tooth. In dental crowns the multilayer structure with functional elasticity gradient modifies the stress distribution in the restoration, with promising results for bioinspired design. (AU)

• FAPESP's process: 18/05736-9 - Process of vitroceramics with zirconia concentration gradient YTZP
• Grantee: Alexandre Luiz Souto Borges
• Support Opportunities: Regular Research Grants