title: Nonlinear visco-elastic finite element analysis of different porcelain veneers configuration.
abstract: This study is aimed at evaluating the biomechanical behavior of feldspathic versus alumina porcelain veneers. A 3D numerical model of a maxillary central incisor, with the periodontal ligament (PDL) and the alveolar bone was generated. Such model was made up of four main volumes: dentin, enamel, cement layer and veneer. Incisors restored with alumina and feldspathic porcelain veneers were compared with a natural sound tooth (control). Enamel, cementum, cancellous and cortical bone were considered as isotropic elastic materials; on the contrary, the tubular structure of dentin was designed as elastic orthotropic. The nonlinear visco-elatic behavior of the PDL was considered. The veneer volumes were coupled with alumina and feldspathic porcelain mechanical properties. The adhesive layers were modeled in the FE environment using spring elements. A 50N load applied at 60 degrees angle with tooth longitudinal axis was applied and validated. Compressive stresses were concentrated on the external surface of the buccal side of the veneer close to the incisal margin; such phenomenon was more evident in the presence of alumina. Tensile stresses were negligible when compared to compressive ones. Alumina and feldspathic ceramic were characterized by a different biomechanical behavior in terms of elastic deformations and stress distributions. The ultimate strength of both materials was not overcome in the performed analysis.
authors: Department of Prosthodontics, University of Naples 'Federico II', Italy.
authors: Roberto
authors: R
authors: Sorrentino
authors: Department of Operative Dentistry, Second University of Naples, Italy.
authors: Davide
authors: D
authors: Apicella
authors: Department of Oral Sciences, Second University of Naples, Italy.
authors: Carlo
authors: C
authors: Riccio
authors: Department of Dentistry, University of Milan 'Vita Salute San Raffaele', Italy.
authors: Enrico
authors: E
authors: Gherlone
authors: Department of Prosthodontics, University of Naples 'Federico II', Italy.
authors: Fernando
authors: F
authors: Zarone
authors: Department of Materials Engineering and Productions, University of Naples 'Federico II', Italy.
authors: Raffaella
authors: R
authors: Aversa
authors: Bioscience Research Center, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, Florida.
authors: Franklin
authors: F
authors: Garcia-Godoy
authors: Department of Dental Materials and Restorative Dentistry, University of Siena, Italy.
authors: Marco
authors: M
authors: Ferrari
authors: DISPAMA, Materials Laboratory, Second University of Naples, Italy.
authors: Antonio
authors: A
authors: Apicella
mesh_terms: D000269:Adhesives; D000328:Adult; D000465:Algorithms; D000537:Aluminum Oxide; D001842:Bone and Bones / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry; D017076:Computer-Aided Design; D003739:Dental Cementum / Q000737:chemistry; D003743:Dental Enamel / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D003804:Dentin / Q000737:chemistry; D020342:Finite Element Analysis; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D008953:Models, Anatomic; D017711:Nonlinear Dynamics; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: D000269:Adhesives; D003776:Dental Porcelain; D000537:Aluminum Oxide