One-year tensile bond strengths of two self-etching primers to bovine enamel.
OBJECTIVE
The purpose of this study was to evaluate the enamel bond strengths of two self-etching primer systems and a total-etch self-priming adhesive system at 24 hours and after a 1-year period of storage in water at 37 degrees C.


METHODS
An experimental self-etching priming system (ABF, Kuraray Medical, Tokyo, Japan), Clearfil SE Bond (Kuraray), and One-Step (Bisco, Schaumburg, IL, USA) were used as the adhesive systems. Eleven bovine incisors stored frozen were ground with 600-grit SiC paper, bonded as recommended by the manufacturers, and restored with Clearfil AP-X (Kuraray) or Renew (Bisco). After 24 hours in water at 37 degrees C, the teeth were sectioned into 0.7 mm-thick slabs that were trimmed and tested for microtensile bond strength using a tabletop tester (EZ test, Shimadzu, Kyoto, Japan) at a crosshead speed of 1 mm/min. Alternate slices were either tested at 24 hours or kept in an incubator at 37 degrees C for 1 year prior to testing. The data were analyzed using paired t-test (p < .05).


RESULTS
Differences in bond strengths were not significant at 24 hours. After 1 year, ABF and Clearfil SE Bond had significantly higher mean bond strengths than at 24 hours (p < .001).


CONCLUSIONS
Enamel bond strengths of the total-etch two-step adhesive remained stable, and the bond strengths of the two self-etching primer systems increased with time.


CONCLUSIONS
Although self-etching primers create a milder etching pattern than does phosphoric acid, the results of this study suggest that the ones evaluated in this study produce stable bond strengths over a 1-year period.
Miguez
Patricia A
PA
Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7450, USA. miguezp@dentistry.unc.edu
Pereira
Ms Patricia N R
MP
Swift
Edward J
EJ
D000134:Acid Etching, Dental / Q000379:methods; D000818:Animals; D002417:Cattle; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D008422:Materials Testing; D008689:Methacrylates; D019279:Resin Cements; D013718:Tensile Strength
C481356:ABF system; C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; C112828:Clearfil AP-X; C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C485364:Renew composite; D019279:Resin Cements