title: One-year aging effects on microtensile bond strengths of composite and repairs with different surface treatments.
abstract: The present study aimed to evaluate effects of different surface treatments and aging of composite cylinders on bond strength of composite resin repair. Thirty-two composite cylinders were produced and divided into four groups according to type of surface treatment and storage time of composite cylinder and repair. Cylinder surface of control group (Gcontrol) received no treatment before composite repair. Other groups were sandblasted with aluminum oxide (GAl2O3), followed by silane (GAl2O3sil) or adhesive (GAl2O3ad). Composite cylinders were stored in artificial saliva for either 24 hours or 1 year. Repairs were performed and stored in artificial saliva for 24 hours or 1 year and repair strength was evaluated using microtensile bond strength test. Data were submitted to Student's t test, two-way ANOVA, and post hoc test for storage time and treatment (α = 0.05). Gcontrol group showed lower values of aging of composite cylinder and storage time of repair (24 hours or 1 year for both) compared with other groups (p < 0.05). GAl2O3ad and GAl2O3sil groups did not exhibit decreased microtensile bond strength with aged repairs (1 year; p > 0.05). Polymer degradation was significant for composite cylinders during the first year of storage in Gcontrol, GAl2O3, and GAl2O3ad groups (p < 0.05). In GAl2O3sil group, storage time of composite cylinders was not significant (p > 0.05). Aging of composite resin influenced bond strength of restoration repair for up to 1 year. Sandblasting with Al2O3, followed by application of silane layer, produced high bond strength after composite or repair aging.
authors.affiliation: Universidade Federal do Rio Grande do Sul, School of Dentistry, Dental Materials Laboratory, Porto Alegre, RS, Brazil.
authors.forename: Marcela Oliveira de
authors.initials: MO
authors.lastname: Souza
authors.affiliation: Universidade Federal do Rio Grande do Sul, School of Dentistry, Dental Materials Laboratory, Porto Alegre, RS, Brazil.
authors.forename: Vicente Castelo Branco
authors.initials: VC
authors.lastname: Leitune
authors.affiliation: Universidade Federal do Rio Grande do Sul, School of Dentistry, Dental Materials Laboratory, Porto Alegre, RS, Brazil.
authors.forename: Stéfani Becker
authors.initials: SB
authors.lastname: Rodrigues
authors.affiliation: Universidade Federal do Rio Grande do Sul, School of Dentistry, Dental Materials Laboratory, Porto Alegre, RS, Brazil.
authors.forename: Susana Maria Werner
authors.initials: SM
authors.lastname: Samuel
authors.affiliation: Universidade Federal do Rio Grande do Sul, School of Dentistry, Dental Materials Laboratory, Porto Alegre, RS, Brazil.
authors.forename: Fabrício Mezzomo
authors.initials: FM
authors.lastname: Collares
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental; D001840:Dental Bonding / Q000379:methods*; D058250:Dental Restoration Repair / Q000379:methods*; D008422:Materials Testing; D015203:Reproducibility of Results; D019279:Resin Cements / Q000737:chemistry*; D012464:Saliva, Artificial / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013499:Surface Properties / Q000187:drug effects; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D003188:Composite Resins; D019279:Resin Cements; D012464:Saliva, Artificial; C084018:Scotchbond Multi-Purpose; D012821:Silanes; D000537:Aluminum Oxide