Adhesive bonding to dentin with iron (II) perchlorate primers and a tri-n-butylborane-initiated luting agent.
OBJECTIVE
This study was conducted to measure the tensile bond strength of a resin to dentin when the dentin was primed with iron (II) perchlorate modified aqueous 2-hydroxyethyl methacrylate (HEMA) or an iron (II) perchlorate modified commercial self-etching primer (ED primer, Kuraray Co.).


METHODS
Bovine dentin surfaces were ground flat and each specimen underwent one of the following two treatments: (1) priming with 2.0 x 10(-6) to 5.0 x 10(-4) mol/g iron (II) perchlorate in aqueous HEMA solutions after etching with 10 wt% phosphoric acid; (2) priming with self-etching primers containing 4.0 x 10(-7) to 2.0 x 10(-4) mol/g iron (II) perchlorate. Each specimen was then bonded to a stainless-steel rod with a luting agent (MMA-TBB resin) consisting of methyl methacrylate (MMA), poly(methyl methacrylate) (PMMA), and tri-n-butylborane (TBB) initiator. Tensile strengths of the bonded tooth specimens were then determined after 1 day immersion in water. Results were analyzed using ANOVA and Duncan's new multiple range test (p < 0.05).


RESULTS
Tensile testing revealed the maximum mean bond strengths (22.5 MPa) when the dentin was primed with 2.0 x 10(-4) mol/g iron (II) perchlorate after etching with 10 wt% phosphoric acid aqueous solution. The highest level of bond strength with self-etching primer (19.6 MPa) was achieved using 1.0 x 10(-4) mol/g iron (II) perchlorate.


CONCLUSIONS
These bonding techniques, combining the use of iron (II) perchlorate modified HEMA primers with MMA-TBB resin, are potentially applicable for seating resin-bonded restorations.
Taira
Y
Y
Department of Fixed Prosthodontics, Nagasaki University School of Dentistry, Japan. yohsuke@net.nagasaki-u.ac.jp
Matsumura
H
H
Yoshida
K
K
Tanaka
T
T
Atsuta
M
M
D000268:Adhesiveness; D000704:Analysis of Variance; D000818:Animals; D001896:Boron Compounds / Q000737:chemistry; D002417:Cattle; D001840:Dental Bonding; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005290:Ferric Compounds; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010472:Perchlorates; D013718:Tensile Strength
D001896:Boron Compounds; D017220:Dentin-Bonding Agents; D005290:Ferric Compounds; D008689:Methacrylates; D010472:Perchlorates; C009523:tri-n-butylborane; C001473:iron perchlorate