Bond strengths of an epoxy resin-based fiber post with four adhesive systems.
OBJECTIVE
To investigate the push-out bond strengths of one epoxy resin-based quartz-fiber post with four adhesive systems.


METHODS
Forty-four single-rooted, single-canal teeth were randomly divided into four groups (n = 11): One-step (One-Step + Duo-link; Bisco), Variolink II (Excite DSC + Variolink II; Ivoclar Vivadent), Panavia F (ED primer + Panavia F; Kuraray), and RelyX (RelyX Unicem; 3M ESPE). All teeth crowns were removed, and the roots were treated with root canal therapy. Four adhesive systems were employed for bonding of one type of quartz-fiber post, strictly according to the manufacturers' instructions. Ten roots in each group were transversely sectioned into cervical, middle, and apical third slices 2 mm thick, and the bond strengths were measured with the push-out test. The other root was processed for SEM analysis. Two-way ANOVA, one-way ANOVA, and Student-Newman-Keuls test were used for statistical analysis.


RESULTS
The push-out bond strengths were 7.15 +/- 3.43 MPa (RelyX), 12.48 +/- 9.33 MPa (One-step), 2.96 +/- 2.76 MPa (Panavia F), and 13.43 +/- 6.14 MPa (Variolink II). Two-way ANOVA showed statistically significant differences among adhesive systems (P < .05) and root regions (P < .05). The bond strengths of One-step and Variolink II groups were statistically higher than those of RelyX and Panavia F groups. The bond strengths of the cervical region of One-step and Panavia F groups were statistically significantly higher than those of the other two regions. The SEM images showed uniform and long resin tags in One-step and Variolink II groups, whereas few or no resin tags were visible in the other two groups.


CONCLUSIONS
The type of adhesive system and root region had a significant influence on the bond strengths of the adhesively luted fiber posts. Total-etching technique achieved better bond strength than did the self-etching technique.
Wang
ZhiGang
Z
Department of Stomatology, The People's Hospital of Henan Province, Zhengzhou, China.
Ji
YaLi
Y
Zhang
FuQiang
F
D000134:Acid Etching, Dental / Q000379:methods; D002484:Cementation / Q000379:methods; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004853:Epoxy Resins / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D019227:Tooth Apex / Q000648:ultrastructure
C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C431350:Duo-Link; C500742:ED Primer II; D004853:Epoxy Resins; C420130:Excite cement; D008689:Methacrylates; C438843:Panavia-Fluoro; C483701:Rely X Unicem; D019279:Resin Cements; D011791:Quartz; C103502:Variolink