Influence of resin cement and post configuration on bond strength to root dentine.

Abstract

AIM:

To evaluate the effect of luting agent and fibreglass post design on bond strength to root dentine at different depths within the canal.

METHODOLOGY:

Ninety single-rooted teeth were root filled and prepared to receive either a parallel-sided and serrated fibreglass post (Reforpost no. 2) or a tapered and smooth fibreglass post (Exato Cônico). The posts were cemented with the following resin cements: dual-cured resin cement (Rely X ARC), two self-adhesive resin cements (Rely X Unicem and MaxCem) and a self-cured resin cement (Cement-Post). The roots were cross-sectioned to obtain two 1-mm-thick discs for each cervical, middle and apical third of the prepared root portion. The posts were submitted to a micropush-out test at a speed of 0.5 mm min(-1), and the bond strength values (MPa) were submitted to anova in a split-plot arrangement and Tukey's test (P < 0.05).

RESULTS:

The RelyX Unicem demonstrated significantly higher bond strength values (P < 0.001) along the root dentine. The RelyX ARC and Cement-Post had similar bond strength values in the cervical third; however, the bond strength decreased significantly (P < 0.001) in an apical direction for the RelyX ARC. Significantly lower bond strength values (P < 0.001), irrespective of canal region, were found for MaxCem cement. The bond strength was similar for both post configurations irrespective of the resin cement and canal region.

CONCLUSIONS:

The retention of glass fibre posts remained unaffected by surface roughness but was influenced by resin cement type. The self-adhesive cement RelyX Unicem yielded a significantly greater (P < 0.001) bond strength value when cementing the fibreglass posts.

• Authors: C J Soares, J C Pereira, A D C M Valdivia, V R Novais, M S Meneses
• Journal: International endodontic journal (Int Endod J) Vol. 45 Issue 2 Pg. 136-45 (Feb 2012) ISSN: 1365-2591 [Electronic] England
• PMID: 21995296 (Publication Type: Comparative Study, Journal Article, Randomized Controlled Trial)
• Copyright: © 2011 International Endodontic Journal.

Chemical References

• Composite Resins
• Dental Materials
• Dentin-Bonding Agents
• Maxcem
• Polymethacrylic Acids
• Rely X Unicem
• RelyX ARC
• Resin Cements
• fiberglass
• Polyethylene Glycols
• Bisphenol A-Glycidyl Methacrylate

Topics

• Adhesiveness
• Bisphenol A-Glycidyl Methacrylate (chemistry)
• Composite Resins (chemistry)
• Dental Bonding
• Dental Materials (chemistry)
• Dental Prosthesis Design
• Dental Pulp Cavity (ultrastructure)
• Dental Stress Analysis (instrumentation)
• Dentin (ultrastructure)
• Dentin-Bonding Agents (chemistry)
• Glass (chemistry)
• Humans
• Materials Testing
• Microscopy, Electron, Scanning
• Polyethylene Glycols (chemistry)
• Polymethacrylic Acids (chemistry)
• Post and Core Technique (instrumentation)
• Resin Cements (chemistry)
• Root Canal Preparation (methods)
• Stress, Mechanical
• Surface Properties
• Tooth Apex (ultrastructure)