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.
Soeno
Kohyoh
K
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
Taira
Yohsuke
Y
Matsumura
Hideo
H
Atsuta
Mitsuru
M
Suzuki
Shiro
S
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