Bonding to caries-affected dentin using self-etching primers.
OBJECTIVE
To evaluate resin bond strengths to caries-affected versus normal dentin using three self-etching primer adhesive systems.


METHODS
Carious lesions were excavated and then bonded with one of three self-etching primer adhesive systems (Clearfil Liner Bond 2, Clearfil Liner Bond 2V, A.R.T. Bond). A crown was then built up using a resin composite to a height of 4 mm. Five to six serial slabs approximately 0.7 mm thick were sectioned perpendicular to the bonded surface. The bonded caries-affected or normal dentin areas were isolated to create an hourglass configuration with a cross-sectional area of approximately 1 mm2. The specimens were subjected to tensile stress at a crosshead speed of 1.2 mm/min. The bonded interfaces to caries-affected and normal dentin were examined with an SEM.


RESULTS
Clearfil Liner Bond 2 and Clearfil Liner Bond 2V produced high bond strengths to normal dentin, but significantly lower bonds than to caries-affected dentin. (P < 0.05). For A.R.T. Bond, there was no statistically significant difference between types of dentin. All three bonding systems produced thin (+/- 0.5-1.5 microns) hybrid layers in normal dentin. When used on caries-affected dentin, all self-etching primer systems produced hybrid layers that were twice as thick as those produced in normal dentin.
Nakajima
M
M
Department of Operative Dentistry, Tokyo Medical and Denal University, Japan.
Ogata
M
M
Okuda
M
M
Tagami
J
J
Sano
H
H
Pashley
D H
DH
D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D003188:Composite Resins; D003442:Crowns; D001840:Dental Bonding; D003731:Dental Caries; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents; D006244:Hardness; D006801:Humans; D008298:Maleates; D008422:Materials Testing; D008689:Methacrylates; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013718:Tensile Strength
C088247:ART Bond; C112274:Clearfil Liner Bond 2; C084544:Clearfil Linerbond System; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008298:Maleates; D008689:Methacrylates; D019279:Resin Cements