New initiator system for bonding to dentin using methylcyclohexanedione.
As a part of a series of studies to examine the role of the initiator system in dentin bonding, the effectiveness of a new polymerization initiator system consisting of 2-methyl-1,3-cyclohexanedione (MCHD) and CuCl2 in dentin bonding was investigated in terms of the effects of dentin conditioners and CuCl2 concentration formulated in MMA/PMMA resins. Curing time and tensile bond strength to bovine dentin were measured using resins composed of MMA containing 0.001-0.03 wt% CuCl2 and PMMA powder containing 2 wt% MCHD. The dentin surfaces were treated with six conditioners consisting of 10 wt% phosphoric acid or citric acid containing 0-3 wt% FeCl3 or CuCl2. The bond strengths of about 10 MPa obtained under optimal conditions were comparable to those reported for tributylborane-initiated MMA resin which is one of the most effective bonding resins available. Thus, the resin using MCHD/CuCl2 system was concluded to be very effective for dentin bonding, especially when dentin was treated with acidic conditioners containing ferric or copper chloride.
Imai
Y
Y
Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan.
Ishikawa
M
M
D000818:Animals; D002417:Cattle; D002712:Chlorides; D019343:Citric Acid; D003300:Copper / Q000737:chemistry; D003512:Cyclohexanones / Q000737:chemistry*; D001840:Dental Bonding; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D010756:Phosphoric Acids; D019904:Polymethyl Methacrylate / Q000737:chemistry*
C111559:2-methyl-1,3-cyclohexanedione; D002712:Chlorides; D003512:Cyclohexanones; D017220:Dentin-Bonding Agents; D005290:Ferric Compounds; D010756:Phosphoric Acids; D019343:Citric Acid; D003300:Copper; D019904:Polymethyl Methacrylate; C030242:phosphoric acid; C029892:cupric chloride; C024555:ferric chloride