title: Shear bond strength required to prevent microleakage of the dentin/restoration interface.
abstract: The purpose of this in vitro study was to determine the relationship between the shear bond strength [SBS] of seven dentin bonding systems to dentin and the quantitative microleakage [ML] of Class V preparations in dentin restored with these systems. The systems evaluated were All-Bond/Bisfil-P [A]; Syntac/Heliomolar [B]; XR-Bond/Herculite [C]; Scotchbond 2/Silux [D]; Denthesive/Charisma [E]; Prisma Universal Bond 2/Prisma AP.H [F]; and Tenure/Perfection [G]. The 115 specimens were removed from the assembly apparatus and stored in saline at 37 degrees C for 24 hours, the SBS determined and expressed in MPa. Fifteen Class V preparations in dentin were restored with each of the bonding systems, thermocycled 500x in 2% methylene blue solution between 50 degrees C and 8 degrees C, and the ML determined by means of a spectrophotometric dye-recovery method. The ML was expressed in microgram dye/restoration. The data were analyzed by ANOVA, Student-Newman-Keuls test, and linear regression analysis. The SBS in MPa were: A:17.2 +/- 3.6; B:15.9 +/- 2.1; C:15.4 +/- 3.7; D:11.6 +/- 2.2; E:10.7 +/- 3.7; F:10.4 +/- 2.5; G:8.2 +/- 3.9. The ML in microgram dye/restoration were: A:2.6 +/- 1.2; B:2.6 +/- 1.0; C:2.2 +/- 1.9; D:3.1 +/- 2.9; E:4.6 +/- 4.2; F:2.6 +/- 2.5; G:4.4 +/- 4.1. SBS = 20.91-2.60 [microgram dye]. The results suggest that a SBS of +/- 21 MPa may reduce ML to near zero.
authors.affiliation: Department of Biomaterials, University of Alabama School of Dentistry, Birmingham 35294.
authors.forename: D H
authors.initials: DH
authors.lastname: Retief
authors.forename: R S
authors.initials: RS
authors.lastname: Mandras
authors.forename: C M
authors.initials: CM
authors.lastname: Russell
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D016014:Linear Models; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D016019:Survival Analysis; D013718:Tensile Strength
chemical_list: C074864:All-Bond system; D003188:Composite Resins; C080827:Denthesive; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D011140:Polyurethanes; D019279:Resin Cements; C078484:Syntac dentine adhesive; C062652:Prisma Universal Bond; C067788:scotchbond 2; C070604:XR Bond; C074811:Tenure adhesive