title: In vitro bond strength of two adhesives to enamel and dentin under normal and contaminated conditions.
abstract: In vitro bond strengths of human enamel and dentin treated with five contaminants were measured with air, water and damp conditions as controls. Two commercial bonding agents (a lower-viscosity, solvent-containing type, AB, and a higher-viscosity, hydrophilic monomer type, SB) and their composites were applied to tooth structure under two conditions (contaminated and re-etched). Samples were debonded in tension after 24 h using an inverted, truncated cone test. Among the controls, the highest bond strengths were obtained with damp conditions for AB (24 MPa) and damp conditions or air for SB (22 MPa) with small differences between enamel and dentin. Most contaminants lowered the bond strength. Re-etching without additional mechanical preparation resulted in bond strengths similar to controls. Bond strengths to tooth structure with the bonding agents tested may be less sensitive to common forms of contamination than typically assumed.
authors.affiliation: Department of Oral Biomaterials, University of Texas-Houston Health Science Center, Dental Branch.
authors.forename: J
authors.initials: J
authors.lastname: Xie
authors.forename: J M
authors.initials: JM
authors.lastname: Powers
authors.forename: R S
authors.initials: RS
authors.lastname: McGuckin
mesh_terms: D000134:Acid Etching, Dental; D000268:Adhesiveness; D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D001769:Blood; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004340:Drug Contamination; D006801:Humans; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D012463:Saliva; D012822:Silicon Dioxide; D013718:Tensile Strength; D014783:Viscosity; D014867:Water; D015040:Zirconium
chemical_list: D000269:Adhesives; C074864:All-Bond system; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C083568:Z100 composite resin; D014867:Water; C078905:Bisfil; D012822:Silicon Dioxide; D015040:Zirconium