Effects of adhesive liner and provisional cement on the bond strength of nickel/chrome/beryllium alloy cemented to dentin.
OBJECTIVE
Treating teeth with adhesive agents before placing a provisional restoration can prevent tooth sensitivity. This study evaluated the bond strength of resin cements to dentin treated with 2 adhesive agents and 2 provisional cements.


METHODS
Extracted human molars were prepared by exposing dentin and were treated with either Prime & Bond NT or Clearfil SE Bond. After a simulated impression technique, the teeth were provisionalized with either a eugenol or noneugenol temporary cement. Teeth were cleaned for bonding by either mechanical removal of the cement or use of an acid conditioner. Panavia F and Calibra resin cements were used to cement nickel/chrome/beryllium alloy to the tooth surfaces, and the specimens were debonded. Mean shear bond strengths for each group were calculated.


RESULTS
Mean shear bond strengths ranged from 26.6 +/- 5.8 MPa for Calibra bonded to dentin treated with Prime & Bond NT, a noneugenol cement, and mechanically cleaned, to 10.6 +/- 4.4 MPa for Panavia F bonded to unlined (no adhesive) dentin treated with a eugenol cement and mechanically cleaned. Of the 14 groups tested, significant differences were observed related to the adhesives and resin cements. Both temporary cements reduced the bond to dentin not treated with a resin adhesive. Use of an acid conditioner for cleaning the temporary cement also reduced bond strengths in all groups.


CONCLUSIONS
Placement of a dentin adhesive before provisionalization may prevent the temporary cement from affecting the bond of the final resin cement to the tooth. For the products used in this study, use of phosphoric acid to clean the tooth surface is not recommended.
Latta
Mark A
MA
Center for Oral Health Research, Creightoni University School of Dentistry, Olmaha, Nebraska, USA. mlatta@creighton.edu
Kelsey
W Patrick
WP
Murdock
Carol M
CM
D002484:Cementation; D002858:Chromium Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003738:Dental Cements / Q000737:chemistry; D003794:Dental Restoration, Temporary; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004338:Drug Combinations; D005227:Fatty Acids / Q000737:chemistry; D006801:Humans; D008768:Methylmethacrylates / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012116:Resins, Plant / Q000737:chemistry; D012459:Salicylates / Q000737:chemistry; D033081:Shear Strength; D013314:Stress, Mechanical; D013943:Thymol / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
C433205:Calibra; D002858:Chromium Alloys; C438313:Clearfil SE Bond; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D005227:Fatty Acids; D008768:Methylmethacrylates; C438843:Panavia-Fluoro; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; D012116:Resins, Plant; D012459:Salicylates; D015035:Zinc Oxide-Eugenol Cement; D013943:Thymol; C031667:IRM cement; C029586:Nogenol; D015034:Zinc Oxide