Comparison of the Bond Strength of Fiber-Reinforced Composite (FRC) Posts to Radicular Dentin Using Different Adhesive Cement: an in-vitro study

Abstract

Introduction: Retention of fiber reinforced composite posts depends on the bond strength between post and cement, and cement and root dentin. The aim of this study is to evaluate the bond strength of one type of fiber post to radicular dentin with different adhesive cements. Materials and Methods: Crowns of 44 cariesfree, human premolar were removed 2 mm below the CEJ and the roots were endodontically treated, then prepared for post cementation. The samples were randomly divided into 4 groups, group 1: Breeze (self-adhesive), group 2: ED Primer II/Panavia F2 (self-etch), group 3: Prime & Bond NT dual-cure /All-Cem (etch & rinse), and group 4: GC Fuji Plus. After post cementation and composite filling of coronal portion(as manufacturers,s instruction) and thermocycling, each specimen was cut into 2 mm thickness from the middle third of the root and the push-out bond strength test was performed and failure modes were recorded. Data were analyzed employing ANOVA and post hoc tests (P value< 0.05). Results: Group 4 showed significantly the highest bond strength (12.88±3.44 MPa), while group 1 showed significantly l ower bond strength than the other groups (5.25±2.98MPa). Also a statistically significant difference was observed between groups 2 and 3 with group 4.(P value<0.021) Conclusion: Retention of fiber post was affected by cement type. The results also indicated that in GC Fuji Plus the chemical interactions between the cement and hydroxyapatite may be important for root dentin bonding. Breeze without any pretreatment procedure cannot obtain the acceptable bond strength.

Comparative Study of Bond Strength of Resin-Modified Glass Ionomer Cement and Flowable Composite with Glass Fiber Posts by Push-Out Test

“…The type of RC also affects retention, as Maryam et al found that the narrow canal held water due to surface tension, making it difficult for the bonding agent to replace it. As a result, even though the RCs were dried using paper points, the bond strength of the etch and rinse technique was lowered due to increased moisture content [27].…”

Push-Out Bond Strength of Resin-Modified Glass Ionomer Cement and Flowable Composite Luting Systems on Glass Fiber Post of Root Canal

“…The type of RC also affects retention, as Maryam et al found that the narrow channel held water due to surface tension, making it difficult for the bonding agent to replace it. As a result, even though the RCs were dried using paper points, the bond strength of the etching and rinse technique was lowered due to increased moisture content [22].…”

“…Several studies reported contradicting results when GIC was used as a bonding agent. This may be because of the usage of 40% citric acid and 3% NaOCl before cementation [22]. The reaction of RMGIC results in an enhanced adaptation to the RC, which may favor the friction resistance to dislodgment of the post.…”

“…The thin-slice push-out test allowed for a more uniform stress distribution along with the bonded interface. As a result, we adopted a push-out design with 4 mm sections in our work, similar to Bitter et al, Farina et al, and Kremeier et al [22]. Shear stress is created at the post-cement interface and the dentin-cement interface during push-out testing.…”