title: Influence of two self-etching primer systems on enamel adhesion.
abstract: The aim of this study was to compare two self-etching and a total-etch adhesive systems by assessing their shear bond strength to bovine enamel and the microleakage on class V composite restorations prepared on bovine enamel. Bovine teeth selected and allocated in three groups: Group 1: Scothbond Multi-Purpose; Group 2: Clearfil Liner Bond 2V; Group 3: Etch & Prime 3.0. For the microleakage test, each group was composed of ten class V restorations on the buccal surface. Two examiners attributed scores ranging from 0 (without leakage) to 3 (maximum leakage) to determine silver nitrate penetration at enamel-composite interface. Microleakage data were analyzed statistically by Kruskal-Wallis and Mann-Whitney tests at 5% significance level. For the bond strength test, ten teeth of each group were included, had their buccal surfaces flattened in order to obtain a 3-mm-diameter area to which a resin cylinder was bonded. After one week, the specimens were tested in shear strength at a crosshead speed of 0.5 mm/min. Bond strength data were treated by ANOVA and LSD tests at 5% significance level. The debonded interfaces were examined under scanning electron microscopy. No leakage was observed along enamel margins. Means (+/- SD) in MPa were: 18.75 (+/-5.83), 22.17 (+/-4.95) and 14.93 (+/-6.7) for Groups 1, 2, and 3, respectively. According to the results of this study, the self-etching primer systems presented statistically similar behavior (p>0.05) to that of the total-etch adhesive system (used as a control), not only regarding marginal leakage at bovine enamel-composite resin interface, but also regarding the shear bond strength of the bovine enamel. However, the self-etching primer systems differed significantly (p>0.05) to each other, with better results for Clearfil Liner Bond 2V. In conclusion, the self-etching primer systems had a performance comparable to that of the total-etch adhesive system.
authors.affiliation: Navy Central Clinic, Brazilian Navy, Rio de Janeiro, RJ, Brazil. marcioparaizo@uol.com.br
authors.forename: Márcio Antônio Paraizo
authors.initials: MA
authors.lastname: Borges
authors.forename: Irma Cunha
authors.initials: IC
authors.lastname: Matos
authors.forename: Kátia Regina Hostílio Cervantes
authors.initials: KR
authors.lastname: Dias
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003763:Dental Leakage / Q000145:classification; D003764:Dental Materials / Q000737:chemistry; D003793:Dental Restoration, Permanent / Q000145:classification; D000431:Ethanol / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D016622:Silver Staining; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C112274:Clearfil Liner Bond 2; D003188:Composite Resins; D003764:Dental Materials; C469823:Etch&Prime 3.0; D008689:Methacrylates; D010710:Phosphates; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C467914:TPH spectrum; D014867:Water; D000431:Ethanol