title: Restorative material and loading type influence on the biomechanical behavior of wedge shaped cervical lesions.
abstract: OBJECTIVE
  To evaluate the influence of restorative materials used on the rehabilitation of MOD cavities and loading type, on biomechanical behavior of wedge-shaped (WS) lesions in endodontically treated maxillary premolars. The investigation was conducted by 3D finite element analysis (FEA) and strain gauge test.
  
  
  METHODS
  Six models were generated, with MOD cavities and endodontic treatment: A (MOD amalgam restoration), R (MOD composite restoration), AL (A + cervical lesion (L)), RL, ALR (A + cervical lesion restored with composite (LR)), and RLR. Each model underwent two compressive loading (100N): axial and oblique-45° angle to the long axis on the buccal cusp. The models were analyzed by von Mises criteria. For strain gauge test, 14 standardized maxillary premolars were treated according to the groups described for FEA. Two strain gauges were bonded on each sample submitted to compressive loading in a mechanical testing machine.
  
  
  RESULTS
  A presented higher stress concentration and strain values than R. Oblique loading promoted highest stress concentration and strain rates for all groups. ALR and RLR presented similar stress-strain distribution pattern when compared to A and R.
  
  
  CONCLUSIONS
  The interaction between MOD cavity restored with amalgam and oblique loading propitiated the highest stress concentration and strain values on cervical region and WS lesion.
  
  
  CONCLUSIONS
  The MOD cavity restored with composite resin is a better option than amalgam to improve the biomechanical behavior of wedge-shaped lesion, avoiding dental failure. In addition, the occlusal interferences must be removed, allowing homogeneous contact distribution and preventing WS lesion progression.
authors.affiliation: Operative Dentistry and Dental Materials Department, Federal University of Uberlandia, Rua Republica do Piratini S/N Bloco 4LA Sala 37 Campus Umuarama, Uberlândia, Minas Gerais, 38405-325, Brazil.
authors.forename: Fabrícia Araújo
authors.initials: FA
authors.lastname: Pereira
authors.affiliation: Operative Dentistry and Dental Materials Department, Federal University of Uberlandia, Rua Republica do Piratini S/N Bloco 4LA Sala 37 Campus Umuarama, Uberlândia, Minas Gerais, 38405-325, Brazil.
authors.forename: Livia Fávaro
authors.initials: LF
authors.lastname: Zeola
authors.affiliation: Operative Dentistry and Dental Materials Department, Federal University of Uberlandia, Rua Republica do Piratini S/N Bloco 4LA Sala 37 Campus Umuarama, Uberlândia, Minas Gerais, 38405-325, Brazil.
authors.forename: Giovana
authors.initials: G
authors.lastname: de Almeida Milito
authors.affiliation: Operative Dentistry and Dental Materials Department, Federal University of Uberlandia, Rua Republica do Piratini S/N Bloco 4LA Sala 37 Campus Umuarama, Uberlândia, Minas Gerais, 38405-325, Brazil.
authors.forename: Bruno Rodrigues
authors.initials: BR
authors.lastname: Reis
authors.affiliation: Department of Dentistry, United Universities of the North of Minas, Avenida Osmane Barbosa, 11111, Montes Claros, Minas Gerais, 39404-549, Brazil.
authors.forename: Rodrigo Dantas
authors.initials: RD
authors.lastname: Pereira
authors.affiliation: Operative Dentistry and Dental Materials Department, School of Dentistry, Federal University of Uberlandia, Rua Republica do Piratini S/N Bloco 4LA Sala 37 Campus Umuarama, Uberlândia, Minas Gerais, 38405-325, Brazil. paulovsoares@yahoo.com.br.
authors.forename: Paulo Vinícius
authors.identifier: http://orcid.org/0000-0001-7071-826X
authors.initials: PV
authors.lastname: Soares
mesh_terms: D001641:Bicuspid / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003723:Dental Amalgam / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000379:methods*; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006171:Gutta-Percha / Q000737:chemistry; D013314:Stress, Mechanical; D019553:Tooth, Nonvital / Q000503:physiopathology*
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; D003723:Dental Amalgam; D006171:Gutta-Percha
keywords: Amalgam; Composite resin; Finite element analysis; Noncarious cervical lesion; Strain gauge test; Wedge-shaped lesion