Bond strength of composite to dentin using self-etching adhesive systems.
OBJECTIVE
To determine the shear bond strength to dentin of five newer-generation self-etching adhesive systems.


METHODS
Flat bonding sites were prepared on 100 extracted human molar teeth with 600-grit silicon carbide paper, which exposed the dentin. The systems tested were: Clearfil SE Bond; Optibond Solo Plus Self-Etch; Xeno CF III; Tyrian SPE; and Adper Prompt L-Pop. Following application of each adhesive system, bonded assemblies of Z-100 were prepared using a gelatin capsule matrix (n = 20). Ten specimens in each group were debonded after water storage for 24 hours at 37 degrees C, and 10 were stored for at least 30 days, followed by thermocycling for 850 cycles between water baths at 5 degrees C and 55 degrees C, with a dwell time of 1 minute in each bath. Specimens were loaded to failure in an Instron Model 1123 testing machine with a crosshead speed of 5 mm/min. Statistical analysis included a two-way analysis of variance (adhesive and time) and Tukey's post hoc test.


RESULTS
Mean shear bond strengths (MPa) at 24 hours were: Clearfil, 26.4+/-4.2; Optibond, 23.5+/-4.4; Xeno, 19.5+/-4.2; Tyrian, 16.5+/-3.7; and Adper, 15.3+/-3.3. Mean shear bond strengths (MPa) after storage and thermocycling were: Optibond, 27.5+/-5.7; Clearfil, 25.5+/-4.9; Adper, 21.5+/-3.3; Xeno, 20.4+/-2.2; and Tyrian, 19.2+/-6.4. Both adhesive system and storage time were significant factors affecting shear bond strength (P < .05).


CONCLUSIONS
There are significant differences in the in vitro dentin shear bond strength among the self-etching adhesive materials tested. Water storage and thermocycling did not significantly degrade the shear bond strength of the materials in this study.
Naughton
William T
WT
Department of General Dentistry, Creighton University School of Dentistry, Omaha, NE 68178, USA. wnaughto@creighton.edu
Latta
Mark A
MA
D000180:Acrylic Resins / Q000737:chemistry*; D000269:Adhesives / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D045662:Dental Etching / Q000379:methods; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008963:Molar; D011140:Polyurethanes / Q000737:chemistry*; D033081:Shear Strength
D000180:Acrylic Resins; D000269:Adhesives; C029012:Composite Dental Resin; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011140:Polyurethanes