title: Cigarette smoke affects bonding to dentin.
abstract: This in vitro study evaluated the microtensile bond strength (muTBS) of composite resin bonded to dentin that had been contaminated by cigarette smoke. Ten extracted unerupted human third molars were used: Six molars were prepared for muTBS testing, while the other four molars were assigned to pre- and post-etching scanning electronic microscopy (SEM) analysis. The 20 specimens obtained from the 10 coronal portions were distributed into two experimental groups so that each tooth served as its own control. Group 1 underwent a daily toothbrushing simulation and exposure to a smoking simulation chamber, while Group 2 received only a daily simulated toothbrushing. Student's t-test demonstrated that Group 1 samples demonstrated significantly lower bond strength (49.58 MPa) than Group 2 samples (58.48 MPa). Pre and postetching SEM analysis revealed the presence of contaminants on the dentinal surfaces of the Group 1 specimens. It was concluded that contamination by cigarette smoke decreases the bond strength between dentin and composite resin.
authors.affiliation: Department of Operative Dentistry, Federal University of Santa Catarina, Florianopolis, Brazil.
authors.forename: Junio S
authors.initials: JS
authors.lastname: Almeida e Silva
authors.forename: Edson Medeiro
authors.initials: EM
authors.lastname: de Araujo
authors.forename: Elito
authors.initials: E
authors.lastname: Araujo
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008964:Molar, Third; D012906:Smoke; D012907:Smoking; D018709:Statistics, Nonparametric; D013718:Tensile Strength / Q000187:drug effects
chemical_list: D000393:Air Pollutants; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D012906:Smoke