title: Effect of different restorative procedures on the fracture resistance of teeth submitted to internal bleaching.
abstract: The aim of this study was to evaluate the influence of different restorative procedures on the fracture resistance of endodontically treated teeth submitted to intracoronal bleaching. Fifty upper central incisors were distributed into 5 groups: GI - healthy teeth; GII - endodontically treated teeth sealed with Coltosol; GIII - endodontically treated teeth bleached and sealed with Coltosol; GIV - endodontically treated teeth bleached and restored with composite resin; and GV - endodontically treated teeth bleached and restored with a fiberglass post and composite resin. In the bleached specimens, a cervical seal was made prior to bleaching with 38% hydrogen peroxide. The gel was applied on the buccal surface and in the pulp chamber, and was then light-activated for 45 s. This procedure was repeated three times per session for four sessions, and each group was submitted to the restorative procedures described above. The specimens were submitted to fracture resistance testing in a universal testing machine. There were statistically significant differences among the groups (p < 0.05). The mean value found for GIII was the lowest (0.32 kN) and was significantly different from the values found for GI (0.75 kN), GII (0.67 kN), GIV (0.70 kN), and GV (0.72 kN), which were not significantly different from each other (p > 0.05). The restorative procedures using composite resin were found to successfully restore the fracture resistance of endodontically treated and bleached teeth.
authors.affiliation: University of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: Andiara Ribeiro
authors.initials: AR
authors.lastname: Roberto
authors.forename: Manoel Damião de
authors.initials: MD
authors.lastname: Sousa-Neto
authors.forename: Raqueli
authors.initials: R
authors.lastname: Viapiana
authors.forename: Alessandro Rogério
authors.initials: AR
authors.lastname: Giovani
authors.forename: Celso Bernardo de
authors.initials: CB
authors.lastname: Souza Filho
authors.forename: Silvana Maria
authors.initials: SM
authors.lastname: Paulino
authors.forename: Yara Teresinha Correa
authors.initials: YT
authors.lastname: Silva-Sousa
mesh_terms: D003188:Composite Resins; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D005898:Glass; D006801:Humans; D011176:Post and Core Technique; D018709:Statistics, Nonparametric; D013997:Time Factors; D014073:Tooth Bleaching / Q000009:adverse effects*; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital / Q000628:therapy*
chemical_list: D003188:Composite Resins; C009753:fiberglass