Surface modification of glass fiber-reinforcedcompositeposts to enhance their bond strength to resin-matrix cements: an integrative review.

Abstract

Endodontically treated teeth usually can reveal an extensive loss of dental structure and require the use of intraradicular poststo provide adequate support and retention. Retention of the post depends on the surface treatment of the endodontic post itself andon the root canal dentin as well as on the type of resin-matrix cement. The mainaim of this study was to conduct an integrative review on the influence of different surface treatment methods of glass fiber-reinfored resin composite(GFRC) postson their push-out bond strength to resin-matrix cements in endodontically treated teeth rehabiliation. A literature search was performed on PubMed(via National Library of Medicine) regardingarticles published within the last 10years, using the following combination of search terms: "intracanal post" OR "endodontic post" OR "root canal post" OR "intraradicular post" OR "glass fiber" AND "resin cement" AND "adhesion" OR "bond strength" OR "shear bond strength" OR "push out". Results from the selected studies recorded the highest push-out bond strengtharound 22.5MPa) on GFRC posts to resin-matrix cements when the surfaces were pre-treated by grit-blasting with silicate followed by silane conditioning. However, high values of push-out bond strength (21.5MPa) were alsonoticed for GFRC posts after etching with hydrogen peroxide followed by silance conditioning. Thus, the highest values of bond strength of endodontic posts to the resin-matrix cements were recorded when a combined physico-chemical approach was assessed. Non-treated surfaces showed the lowest bond strength values between5 to and9MPa. Surface analyses of GFRCposts showed an increased roughness after grit-blasting or etching that promoted a mechanical interlocking of the adhesive and resin-matrix cements. The combined treatment of glass fiber-reinforced resincompositepost surfaces by physical and chemical methods can promote the increase in roughness and chemical functionalization of the surfaces prior to cementation., Thatresults in a high mechanical interlocking of the resin-matrix cements and astable retention of the teeth root intracanal posts. Combining chemical and physical modification methodsof surfaces can provide the most promising adhesion-enhancing pathways of GFRC posts to resin-matrix cements, that can decrease the risk of clinical failures by fracture and detachment of endodontic posts.