Abstract
BackgroundLongevity of post-retained restoration is highly depended on bonding stability of fiber post (FP) to root dentin. This study evaluated the effect of different antibacterial/adhesive approaches on bonding durability of FPs luted into root canal with a self-etch cement.Material and MethodsSeventy-two human maxillary central incisor roots were divided into six groups after endodontic treatment, based on the antibacterial/adhesive treatments as follows: 1)ED primer II (ED, control); 2) Clearfil Protect Bond (PB); 3) 2% chlorhexidine (CH) pretreatment + ED primer II (CH+ED); 4) CH-incorporated into ED primer II (CH in ED); 5) CH pretreatment + Clearfil SE Bond (CH+SE); and 6)CH-incorporated into SE primer (CH in SE). The FPs were then cemented using PanaviaF2.0. After micro-slicing the bonded root dentin, a push-out bond strength (PBS) test was performed immediately or after two years of water storage. Data were analyzed using ANOVA and post hoc Tukey tests (α=0.05).ResultsThe effects of antibacterial/adhesive approach, time and interaction between the main factors were significant (p=0.01). There was no significant difference between the immediate groups, except between the CH+ED group (the lowest PBS) and PB and CH in SE groups (the highest PBS) (p≤0.03). After aging, the same difference was observed (p≤0.02); the control group exhibited a significantly lower PBS compared to the other groups (p≤0.01), except for CH+ED. Aging significantly decreased PBS of all the groups (p≤0.01); the control group exhibited the highest reduction.ConclusionsCH incorporated into self-etch primers or in pretreatment step prior to two-step self-etch adhesive and antibacterial adhesive could improve bond stability of self-etch cemented fiber post. However, none of these was capable of inhibiting bond degradation over time. Key words:Push-out bond strength, Fiber post, Chlorhexidine.
Highlights
Numerous favorable properties of fiber posts (FP) have resulted in their widespread use for the restoration of endodontically treated teeth
Some studies reported bonding longevity of adhesive-cemented FPs following CH irrigation of post space in root canals with different results [6,7,8]. This approach introduces an additional step to complex fiber post adhesive cementation, increasing chair-time. This paves the way for benefiting from better efficacy of antibacterial activity of CH in 2% concentration than lower concentrations [9] in the root canal, it might limit the efficacy of MMP inhibitory activity of CH due to simultaneous demineralization and resin penetration of Self-etch adhesive (SE) cements into the smear layer-covered dentin
Hiraishi et al demonstrated that incorporation of 1% CH into ED Primer 2.0 exhibited significant antibacterial activity without any adverse effect on bond strength of Panavia F2.0 to dentin [10]
Summary
Numerous favorable properties of fiber posts (FP) have resulted in their widespread use for the restoration of endodontically treated teeth. This approach introduces an additional step to complex fiber post adhesive cementation, increasing chair-time This paves the way for benefiting from better efficacy of antibacterial activity of CH in 2% concentration than lower concentrations [9] in the root canal, it might limit the efficacy of MMP inhibitory activity of CH due to simultaneous demineralization and resin penetration of SE cements into the smear layer-covered dentin. On this basis, incorporating CH into acidic primers could be another approach to provision of positive effects of CH during adhesive cementation. The aim of this study was to test the null hypothesis that various adhesive/antibacterial approaches have no effects on bonding performance of an SE cement in root canal space immediately and at long term
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