Fiber post adhesion to radicular dentin: The use of acid etching prior to a one-step self-etching adhesive.
The aim of this study was to evaluate the bond strength of fiber posts luted with a one-step self-etching adhesive with the push-out test after phosphoric acid conditioning of the root dentin. Thirty-six single-rooted teeth were endodontically treated. Teeth were sectioned perpendicularly to the cementoenamel junction, and a 10-mm post space was prepared with a calibrated bur. Specimens were then divided into three groups according to the adhesive protocol: A, total-etch three steps; B, self-etch one step; and C, 32% phosphoric acid conditioning and self-etch one step. Fiber posts were luted with self-curing resin-based cement. Teeth were cut in 1-mm slices and pushed until failure with an Instron machine. Results were statistically analyzed with the ANOVA and Bonferroni tests (P < .05). Two additional specimens from each group were examined under the scanning electron microscope (SEM). The 32% phosphoric acid significantly influenced the push-out bond strength of fiber posts luted with self-etch adhesives (P < .05). SEM analysis showed a continuous hybrid layer with resin tags and lateral branches in groups A and C, while group B showed smear layer dissolution with poor infiltration of the tubules.
Department of Cariology and Operative Dentistry, University of Turin, Italy. nicola.scotti@unito.it
Nicola
N
Scotti
Riccardo
R
Rota
Marco
M
Scansetti
Giuseppe
G
Migliaretti
Damiano
D
Pasqualini
Elio
E
Berutti
D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D001840:Dental Bonding; D003786:Dental Pulp Cavity; D003799:Dental Stress Analysis; D003804:Dentin / Q000648:ultrastructure; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D005898:Glass; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D011176:Post and Core Technique; D019279:Resin Cements; D018709:Statistics, Nonparametric
D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D019279:Resin Cements; C009753:fiberglass; C100742:All-Bond 2