Evaluation of a novel dentin bonding system compared to commercial bonding system.
OBJECTIVE
The aim of the current study was to compare the bond strength of an experimental bonding system with commercial bonding systems.


METHODS
An aqueous solution of 10% ascorbic acid and 5% ferric chloride was prepared as an experimental conditioner (Exp). The flattened human dentin surfaces were conditioned with phosphoric acid, NaOCl, and Exp. They were bonded to a stainless steel rod with 4-META/MMA-TBB resin. Super-Bond C&B (10-3), Panavia Fluoro Cement (Panavia), Panavia Fluoro Cement with AD gel (AD/Panavia), and All-Bond 2 system (All-Bond 2) were also used. After immersion in water for 24 h, half of the specimens of each group were tested for tensile bond strength, and the remaining specimen groups were subjected to 10,000 cycles of thermo-cycling prior to tensile testing. All of the data were analysed by ANOVA and a post hoc test. In addition, two thermo-cycled specimens (10-3/10,000, Exp/10,000) were prepared for photomicrography.


RESULTS
The bond strengths of Exp and AD/Panavia groups showed no decrease after 10,000 thermo-cycles, although those of 10-3, Panavia, and All-Bond groups decreased significantly after thermo-cycling. SEM micrographs exhibited that cracks and voids can be observed in the 10-3/10,000 specimen at the interface of the adhesive resin and the hybrid layer, although neither a hybrid layer nor cracks can be seen in the Exp/10,000 specimen.


CONCLUSIONS
Comparison of the tensile bond strengths for all adhesive resins revealed that the novel dentin bond system with experimental conditioner and Panavia Fluoro Cement with AD gel exhibited the most durable bonding after thermo-cycling.
Soeno
Kohyoh
K
Division of Fixed Prosthodontics and Oral Rehabilitation, Department of Developmental and Reconstructive Medicine, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto, Nagasaki, Japan. soeno@net.nagasaki-u.ac.jp
Suzuki
Shiro
S
Yokomichi
Rie
R
Taira
Yohsuke
Y
Atsuta
Mitsuru
M
D000134:Acid Etching, Dental; D000704:Analysis of Variance; D001205:Ascorbic Acid / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry; D002712:Chlorides; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength
C476988:4-methacryloxyethyltrimellitic acid-methylmethacrylate-tributylborane; D001896:Boron Compounds; D002712:Chlorides; D017220:Dentin-Bonding Agents; D005290:Ferric Compounds; D008689:Methacrylates; D008768:Methylmethacrylates; C438843:Panavia-Fluoro; D010756:Phosphoric Acids; D019279:Resin Cements; D013193:Stainless Steel; C100742:All-Bond 2; C049495:Super-bond; D012973:Sodium Hypochlorite; D001205:Ascorbic Acid; C024555:ferric chloride