title: Finite element analysis of weakened roots restored with composite resin and posts.
abstract: Finite element analysis (FEA) was used to investigate the influence of different post systems on the stress distribution of weakened teeth under oblique-load application. A maxillary central incisor root obtained from a sound tooth was weakened by partial removal of dentin inside the root canal. Seven two-dimensional numerical models, one from the sound tooth and six from the weakened root restored with composite resin and post systems were created as follows - ST: sound tooth; CPC: cast CuAl post and core; SSP: stainless steel post + composite core; GP: fiberglass + composite core; CP: carbon fiber + composite core; ZP: zirconium dioxide post + composite core; TP: titanium post + composite core. The numerical models were considered to be restored with a leucite-reinforced all-ceramic crown and received a 45 masculine occlusal load (10 N) on the lingual surface.All the materials and structures were considered linear elastic, homogeneous, and isotropic, with the exception of fiberglass and carbon fiber posts which assumed orthotropic behavior. The numerical models were plotted and meshed with isoparametric elements, and the results were analyzed using von Mises and Sy stress criteria. When compared with the sound tooth, FEA revealed differences in stress distribution when post systems were used. Among the restored teeth, the use of CPC, SSP, ZP, and TP resulted in higher stress concentration in the post itself when compared to GP and CP. Therefore, results from the FEA images suggested that the use of non-metallic post systems could result in improved mechanical behavior for the weakened restored teeth.
authors.affiliation: Department of Endodontics, School of Dentistry, Catholic University of Brasilia, Distrito Federal, Brazil.
authors.forename: Carla Santina de Miranda
authors.initials: CS
authors.lastname: Coelho
authors.forename: João Carlos Gabrielli
authors.initials: JC
authors.lastname: Biffi
authors.forename: Gisele Rodrigues da
authors.initials: GR
authors.lastname: Silva
authors.forename: Anthony
authors.initials: A
authors.lastname: Abrahão
authors.forename: Roberto Elias
authors.initials: RE
authors.lastname: Campos
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
mesh_terms: D000535:Aluminum / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D001732:Bite Force; D002244:Carbon / Q000737:chemistry; D000077482:Carbon Fiber; D003188:Composite Resins / Q000737:chemistry*; D003198:Computer Simulation; D003300:Copper / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D017267:Dental Prosthesis Design; D055119:Elastic Modulus; D020342:Finite Element Analysis; D005898:Glass / Q000737:chemistry; D006801:Humans; D007180:Incisor / Q000503:physiopathology; D008422:Materials Testing; D008954:Models, Biological; D011176:Post and Core Technique / Q000295:instrumentation*; D013193:Stainless Steel / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D014092:Tooth Root / Q000503:physiopathology*; D019553:Tooth, Nonvital / Q000503:physiopathology*; D015040:Zirconium / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D000077482:Carbon Fiber; D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; C009753:fiberglass; D003776:Dental Porcelain; D013193:Stainless Steel; C078519:leucite; D002244:Carbon; D003300:Copper; D015040:Zirconium; D000535:Aluminum; D014025:Titanium; C028541:zirconium oxide