Effect of 10% phosphoric acid conditioning on the efficacy of a dentin bonding system.
The efficacy of a commercial total-etch wet-bonding dentin bonding system and the effect of conditioning using 10% phosphoric acid both on the Ca-content in the substrate dentin and on the efficacy of the experimental contraction gap-free dentin bonding system were evaluated by measuring the wall-to-wall polymerization contraction gap width of a commercial light-activated resin composite filled into a cylindrical cavity prepared in extracted human dentin. The Ca-content in the dentin was measured with an EDS. Complete marginal adaptation was obtained only in the experimental contraction gap-free dentin bonding system group. The Ca-content in the dentin was rapidly reduced by the 10% phosphoric acid conditioning. It was concluded that the dentist should not decalcify the dentin cavity wall possibly by using a dentin conditioner such as 10% phosphoric acid because the resin composite paste is apt to separate easily from the decalcified dentin cavity wall during polymerization.
Wu
J
J
Department of Operative Dentistry, Showa University, School of Dentistry, Tokyo, Japan.
Itoh
K
K
Yamashita
T
T
Tani
C
C
Hisamitsu
H
H
Wakumoto
S
S
D000134:Acid Etching, Dental; D000704:Analysis of Variance; D002118:Calcium / Q000032:analysis; D003188:Composite Resins; D018772:Dental Marginal Adaptation; D003804:Dentin / Q000737:chemistry / Q000187:drug effects; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004492:Edetic Acid; D006801:Humans; D008689:Methacrylates; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; C074669:Clearfil Photo Bond; C074741:Silux Plus; C005044:hydroxyethyl methacrylate; D004492:Edetic Acid; C030242:phosphoric acid; D002118:Calcium