Can the Cure Time of Endodontic Sealers Affect Bond Strength to Root Dentin?

Abstract

The cure time of endodontic sealers may influence the bond strength of fiber posts to root dentin. Forty teeth were selected and endodontically filled using calcium hydroxide cement and then divided into 2 groups according to the time elapsed between endodontic filling and post luting (n = 20): Immediately -glass fiber post luting immediately after endodontic filling; and Delayed -post luting performed 7 days after endodontic filling. The roots were also subdivided according to resin cement used for post luting (RelyX ARC and RelyX Unicem). The specimens were stored at 37°C for 24 h and sectioned in six 1-mm-thick slices from cervical, middle and apical thirds. The slice specimens were submitted to a push-out test at a crosshead speed of 0.5 mm/min, and the bond strength values obtained (MPa) were submitted to two-way ANOVA in a split-plot arrangement and Tukey's test (α=0.05). For both RelyX ARC and Unicem, the bond strength was significantly higher when the posts were cemented 7 days after the endodontic treatment. RelyX Unicem showed significantly higher bond strength values than RelyX ARC for both cementation periods. It was concluded that post luting should be made after the complete setting of the root canal sealer. Self-adhesive resin cement should be preferred for fiber post luting.

A systematic review of factors associated with the retention of glass fiber posts

“…From the 34 studies included, 14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47 35 distinct data sets were extracted because one article had two different data sets. 23 BS values are presented in Table 1.…”

Restoration of Root Canal-Treated Teeth

“…Mechanical cleaning using hand instruments or fi les should be combined with a fi nal irrigation protocol that will be explained in detail in this chapter later on. (Demiryurek et al 2010 ;Vano et al 2012 ;Mesquita et al 2013 ). In studies of one working group, eugenol-based sealers reduced the retention of fi ber posts luted with resin cements compared to epoxy resin-based sealers .…”

Effects of two different sealer material on fiber post bond strength in root canal

“…1 Fiber post is considered as a promising alternative because its elasticity modulus is similar to those of dentin and the resulting stress distribution is uneven and more aesthetic. [7][8][9][10] Some researchers have reported that the factors affecting the fiber post bond strength is the shape and design of the post, the length and diameter of the post, the type of luting cement, cementation method and the type of sealer used in root canal obturation. 11 To support the bond of intracanal post, the cement is required to hold the post and the canal root wall.…”