Abstract
The aim of this study was evaluate the influence of the substance used as root canal lubricant during relining and the cleaning protocol on the bond strength of relined posts to root dentin. Eighty single canal mandibular bovine incisors were used in the study. The root canals were endodontically treated and allocated into four groups (n = 20) according to the lubricant material and the root canal cleaning protocol: petroleum jelly/no cleaning; petroleum jelly/cleaning with paper points; hydrosoluble gel/no cleaning; hydrosoluble gel/water rinse and drying with paper points. All posts were relined with resin composite and luted to the root canals with regular resin cement. Specimens were cross-sectioned to obtain root slices producing 1.5 mm thick slices. The push-out test was performed at a crosshead speed of 0.5 mm/min until post dislodgement occurred. The failure mode was verified using a stereomicroscope. Data were analyzed by two-way ANOVA followed by Tukey post hoc test (push-out) with α = 0.05. A statistically significant difference was found considering the type of lubricant (p < 0.001). The hydrosoluble gel/water rinse group showed the highest mean bond strength value (11.0 ± 3.7 MPa). The most frequent pattern of failure was adhesive between the root canal walls and resin cement. The use of a hydrosoluble gel as lubricant substance seems to be adequate for the relining post technique.
Highlights
Glass fiber posts (GFP) were introduced in restorative dentistry as an alternative to cast metal posts, presenting good aesthetic results and better stress distribution around the dentin/resin and cement/post interface due to the similar elastic modulus of GFP and dentin [1,2,3,4,5]
It is not clear if the substance used as lubricant and the cleaning protocol of root canal walls used after this lubrication could influence the bond strength of relined posts to root dentin
Experimental Design This in vitro study has a factorial 2 × 2 design and assessed if lubricant material and the cleaning method could affect the bond strength of relined glass fiber posts. For this purpose, flared incisors received a relined glass fiber post and divided into four groups according to the factor lubricant and the factor root canal wall cleaning protocol
Summary
Glass fiber posts (GFP) were introduced in restorative dentistry as an alternative to cast metal posts, presenting good aesthetic results and better stress distribution around the dentin/resin and cement/post interface due to the similar elastic modulus of GFP and dentin [1,2,3,4,5]. Knabach et al Appl Adhes Sci (2016) 4:17 walls and reducing the thickness of the resin cement [12] This technique requires the canal lubrication to allow post removal from the canal to be light cured previously to cementation [13]. Previously to GFP cementation, the root canal should be cleaned to remove the substance used as lubricant, which could hypothetically jeopardize the adhesion of GFP to root canal dentin. It is not clear if the substance used as lubricant and the cleaning protocol of root canal walls used after this lubrication could influence the bond strength of relined posts to root dentin
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