title: Bond strength of HEMA-containing versus HEMA-free self-etch adhesive systems to dentin.
abstract: This study analyzed the bond strength (BS) of HEMA versus HEMA-free self-etch adhesive systems to dentin. The occlusal surface of 20 third molars was removed and the dentin was abraded with 600-grit silicon carbide paper. The teeth were randomly assigned to 4 groups (n = 5) and restored with GO, Adper SE Plus, OptiBond All-In-One, and Clearfil 3S Bond adhesive systems and Filtek Z350 composite. After light curing (600 mW/cm²), the teeth were stored in distilled water at 37 ºC for 24 h and were sectioned in the mesiodistal and buccolingual directions to obtain sticks (0.8 mm²). The sticks were subjected to tensile force using a universal testing machine (0.5 mm/min), and the modes of failure were analyzed by scanning electron microscopy and classified as adhesive, cohesive, or mixed. The BS data (in MPa) were treated using one-way ANOVA and Tukey's tests at 5% significance. GO presented the lowest mean bond strength value (10.57 ± 3.72) and differed significantly from the other materials (p = 0.001), which, in turn, presented statistically similar results (p>0.05) among themselves: Adper SE Plus (29.08 ± 8.93), OptiBond All-In-One (28.36 ± 6.49), and Clearfil 3S Bond (28.62 ± 6.97). Mixed fractures were the most prevalent. It was concluded that the influence of HEMA on BS to dentin was material dependent.
authors.affiliation: Dental School, University North of Paraná, Londrina, PR, Brazil.
authors.forename: Klíssia Romero
authors.initials: KR
authors.lastname: Felizardo
authors.forename: Letícia Vargas Freire Martins
authors.initials: LV
authors.lastname: Lemos
authors.forename: Rodrigo Varella
authors.initials: RV
authors.lastname: de Carvalho
authors.forename: Alcides
authors.initials: A
authors.lastname: Gonini Junior
authors.forename: Murilo Baena
authors.initials: MB
authors.lastname: Lopes
authors.forename: Sandra Kiss
authors.initials: SK
authors.lastname: Moura
mesh_terms: D000268:Adhesiveness; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C515604:Clearfil Tri-S Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C532472:Go self-etching primer; D008689:Methacrylates; C092987:Optibond; D019279:Resin Cements; C533204:filtek Z350; D014867:Water; C005044:hydroxyethyl methacrylate