title: Fracture resistance of teeth restored with indirect-composite and ceramic inlay systems.
abstract: Fracture resistance of dentin-bonded inlays may be influenced by the restorative material used. The purpose of this study was to evaluate, in vitro, the fracture resistance of teeth restored with four tooth-colored materials: feldspathic ceramic, Duceram LFC, and three laboratory resins, Solidex, Artglass, and Targis. Sixty mandibular molar teeth were placed in resin cylinders, reproducing the periodontal ligaments. Mesial-occlusal-distal (MOD) inlay preparations were made in a standard cavity preparation appliance. Subsequently, the teeth were molded, and the restorations were prepared following the manufacturer's instructions. The inlays were cemented with resin composite cement, Rely X, and stored at 37 degrees C and 100% humidity for 24 hours. The samples were then submitted to an axial compression load at a speed of 0.5 mm/minute. Statistical analysis by one-way ANOVA and Tukey's multiple comparison test revealed that the teeth restored with Duceram LFC (205.44 +/- 39.51 kgf) showed statistically inferior fracture resistance than the three other groups restored with indirect resin composites (Solidex [293.16 +/- 45.86 kgf], Artglass [299.87 +/- 41.08 kgf], and Targis [304.23 +/- 52.52 kgf]).
authors.affiliation: Operative Dentistry and Dental Materials Department, Uberlândia Dental School, Federal University of Uberlândia, Uberlândia, MG, Brazil. carlosjsoares@umuarama.ufu.br
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
authors.forename: Luis Roberto Marcondes
authors.initials: LR
authors.lastname: Martins
authors.forename: Jesuânia Maria Guardiero Azevedo
authors.initials: JM
authors.lastname: Pfeifer
authors.forename: Marcelo
authors.initials: M
authors.lastname: Giannini
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D000704:Analysis of Variance; D002516:Ceramics / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000145:classification; D003776:Dental Porcelain / Q000737:chemistry; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D007284:Inlays / Q000379:methods*; D008963:Molar; D017680:Potassium Compounds / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012823:Silicate Cement / Q000737:chemistry; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000145:classification / Q000517:prevention & control*
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C095718:Duceram; D005899:Glass Ionomer Cements; D017680:Potassium Compounds; D019279:Resin Cements; C113676:Solidex; C084550:Vitremer; C111282:dental polyglass; D003776:Dental Porcelain; C016447:feldspar; D012823:Silicate Cement