Adhesive bond strengths using self- and light-cured composites.
OBJECTIVE
To evaluate the microtensile bond strength (microTBS) of four adhesive systems to dentin, using self- and light-cured resin composites.


METHODS
Crowns of human molars were separated from the roots, and the occlusal surfaces were ground to obtain flat superficial dentin. Three etch-and-rinse adhesives--All-Bond 2, One-Step Plus, and OptiBond Solo Plus--and one self-etching primer system, Peak SE, were evaluated. Each adhesive group was divided into two subgroups according to the type of resin composite used. A self-cured (Bisfil 2B) or light-cured (Filtek Supreme Plus) resin composite build-up was incrementally inserted to the dentin after each adhesive system was applied. The bonded specimens were stored in water for 24 h and sectioned into beams. Microtensile testing was done, and the data were subjected to ANOVA and Fisher's PLSD test.


RESULTS
The microTBS of All-Bond 2 and One-Step Plus was not affected by the type of resin composite used (p=0.3131 and p=0.1562, respectively). The microTBS of OptiBond Solo Plus was significantly reduced when used with self-cured resin composite (p<0.0001). Peak SE formed no bond of self-cured resin composite to dentin.


CONCLUSIONS
Some adhesives do not effectively bond self-cured resin composite to dentin.


CONCLUSIONS
Incompatibility between adhesives with low pH and certain self-cured resin composites can cause clinical debonding of restorations.
Walter
Ricardo
R
Department of Operative Dentistry, School of Dentistry, University of North Carolina at Chapel Hill, NC, USA. rick_walter@dentistry.unc.edu
Macedo
Georgia V
GV
Oliveira
Gustavo M S
GM
Swift
Edward J
EJ
D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry / Q000187:drug effects; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004344:Drug Incompatibility; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008689:Methacrylates; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C451600:OptiBond Solo Plus; D019279:Resin Cements; C100742:All-Bond 2