Effect of the surface treatment of plain carbon fiber posts on the retention of the composite core: an in vitro evaluation

Abstract

This study aims to evaluate the role of surface treatments performed on plain carbon fiber posts, in relation to serrated carbon fiber posts, in the retention of the composite core. Fifty carbon fiber posts received surface treatments in order to verify their influence on the retention of the core material. An acrylic resin mold was developed in order to precisely fit the post, leaving a machined space to accommodate a self-curing composite resin. After the surface treatment, a primer was applied on the coronal portion of all posts, which were then dried. They were fitted to the mold and received a 3 mm composite core. All specimens were thermocycled and then stored in distilled water for a week. Tension test was performed at a speed of 0.5 mm/min until there was lack of adhesion or fracture of the core. The conclusions were: a) the values of retention related to aluminum oxide spray (group A), depth cutter diamond burs (group C) and posts with machined coronal portion (group D) were comparable to those of serrated posts (group E), although no statistically significant difference between these groups was found; b) the mean values of core retention in group B (medium grit diamond burs) were statistically lower than those of other groups.

Microtensile bond strength of quartz fiber posts to different composite cores

“…The durability of a restoration with a composite core depends on the bond between the composite resin and the remaining tooth structure, and also on the bond between the composite core and the fiber post, which helps in stress distribution under functional loading. 8 A variation of composite resin materials, including packable (high elastic modulus), micro hybrid (intermediary elastic modulus) and flowable (low elastic modulus) composites are available for core build-up of endodontically treated teeth. Some laboratory and technical evidence supports the use of flowable composites for restorations reinforced with FRC posts.…”

Fibre-based post systems: a review

“…The majority of the literature took the form of investigations conducted in vitro. 5,6,[42][43][44][45][46] These studies examined a number of areas such as the physical properties of the posts and post/root relationship, 6,7,9,[12][13][14]20,22,23,[26][27][28][29][31][32][33]35,37,38,42 retention testing, 11,15,19,22,30,[32][33][34]36,43,44 scanning electron microscopy of the post/root interface, 14,16,17,22,38,40,46,47 microleakage, 10,24 and corrosion of metals with fibre-posts. 18 Other papers examined thermal stress, …”

“…Surface treatment of smooth carbon-fibre posts with aluminium oxide blasting and grooving with diamond burs has been shown to make core retention comparable with that of the serrated version. 34 Post retention in the root Within the prepared post space, cemented stainless steel posts have been shown to be more retentive than carbon-fibre posts 11,32 when cemented with either resin or zinc phosphate cement. Other workers have however, shown no difference in retention 15,22,44 where posts were cemented with a resin cement.…”

Indirect restoration in composite resin: a clinical report of self-adhesive cementation in deproteinized dentin

“…Over time, it was observed that the use of metal cores was no longer a viable option for many of these cases, due to the absence of adhesion, possibility of corrosion and high modulus of elasticity. 22,23 The prefabricated posts, on the other side, such as those of fiberglass used in the clinical case, were developed to replace in some situations the cast posts and also the prefabricated metal cores. The modulus of elasticity of the fiberglass posts is more similar to dentin, to the resin cement used to fix the post to the tooth and the composite resin to the filling, qualifying it for clinical use.…”