Adhesion of 4-META/MMA-TBB resin to collagen-depleted dentin--effect of conditioner with ascorbic acid/ferric chloride.
The purpose of this study was to evaluate ascorbic acid (AS) and ferric chloride (FE) for bonding 4-META/MMA-TBB resin to dentin that had been treated with NaClO. An experimental dentin conditioner consisting of 10%AS and 5%Fe (10AS-5FE) and three controls (10AS-0FE, 0AS-5FE, and 0AS-0FE) were prepared. Ascorcic acid neutralizes NaClO. The flattened dentin surfaces were modified sequentially with phosphoric acid etchant, NaClO agent, and the experimental conditioner, then each surface was bonded to a stainless steel rod with 4-META/MMA-TBB resin. The Super-Bond C&B (10-3/SB) system was also used. 24-hour tensile bond strengths were determined. The bonding system using 10AS-5FE conditioner showed significantly high bond strength compared to 10AS-0FE, 0AS-5FE, and 0AS-0FE. No significant differences were observed between 10AS-5FE and 10-3/SB. Microphotographs suggested that no hybrid layer formed in the 10AS-5FE group. Although the use of phosphoric acid and NaClO resulted in decreased bond strength between 4-META/MMA-TBB resin and dentin, additional conditioning with ascorbic acid and ferric chloride improved the bond strength.
Nagasaki University, Graduate School of Biomedical Sciences, Department of Developmental and Reconstructive Medicine, Division of Fixed Prosthodontics and Oral Rehabilitation, Sakamoto, Nagasaki, Japan. soeno@net.nagasaki-u.ac.jp
Kohyoh
K
Soeno
Yohsuke
Y
Taira
Hideo
H
Matsumura
Mitsuru
M
Atsuta
Shiro
S
Suzuki
D000268:Adhesiveness; D000704:Analysis of Variance; D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology*; D001896:Boron Compounds; D002417:Cattle; D002712:Chlorides; D003094:Collagen / Q000187:drug effects; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents; D005290:Ferric Compounds / Q000494:pharmacology*; D008422:Materials Testing; D008768:Methylmethacrylates; D019279:Resin Cements; D012973:Sodium Hypochlorite / Q000494:pharmacology; D013718:Tensile Strength
C476988:4-methacryloxyethyltrimellitic acid-methylmethacrylate-tributylborane; D001896:Boron Compounds; D002712:Chlorides; D017220:Dentin-Bonding Agents; D005290:Ferric Compounds; D008768:Methylmethacrylates; D019279:Resin Cements; D003094:Collagen; D012973:Sodium Hypochlorite; D001205:Ascorbic Acid; C024555:ferric chloride