Effect of bur-cut dentin on bond strength using two all-in-one and one two-step adhesive systems.
OBJECTIVE
To compare the microtensile bond strength (MTBS) of two all-in-one adhesive systems and one experimental two-step self-etching adhesive system to two types of bur-cut dentin.


METHODS
Using one of the three adhesives, Xeno CF Bond (Xeno), Prompt L-Pop (PL), or the experimental two-step system ABF (ABF), resin composite was bonded to flat buccal and root dentin surfaces of eight extracted human premolars. These surfaces were produced using either regular-grit or superfine-grit diamond burs. After storage overnight in 37 degrees C water, the bonded specimens were sectioned into six or seven slices approximately 0.7 mm thick perpendicular to the bonded surface. They were then subjected to microtensile testing. The surfaces of the fractured specimens were observed microscopically to determine the failure mode. In addition, to observe the effect of conditioning, the two types of bur-cut dentin surfaces were conditioned with the adhesives, rinsed with acetone, and observed with SEM.


RESULTS
When Xeno and PL were bonded to dentin cut with a regular-grit diamond bur, MTBS values were lower than to superfine bur-cut dentin, and failures occurred adhesively at the interface, whereas the experimental two-step adhesive showed no significant difference in microtensile bond strength between two differently cut surfaces.


CONCLUSIONS
The all-in-one adhesives tested here improved bond strengths when bonded to superfine bur-cut dentin as a substrate, whereas the experimental two-step adhesive system showed unchanged bonding to both regular and superfine bur-cut dentin surfaces.
Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.
Kaori
K
Koase
Satoshi
S
Inoue
Mamoru
M
Noda
Toru
T
Tanaka
Chiharu
C
Kawamoto
Akiko
A
Takahashi
Yasuko
Y
Nakaoki
Hidehiko
H
Sano
D000096:Acetone / Q000737:chemistry; D000704:Analysis of Variance; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D019246:Tooth Preparation / Q000295:instrumentation*; D014867:Water / Q000737:chemistry
C481356:ABF system; D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C408584:Prompt L-Pop; D019279:Resin Cements; C417842:Xeno compomer; D014867:Water; D000096:Acetone; D018130:Diamond