A Bond Strength Study of Luted Castable Ceramic Restorations

Abstract

Accurate intra coronal castings can be produced using a castable ceramic-DICOR®-for which there is a need to identify a suitable luting cement. The aim of this investigation was to evaluate the bond strength of three glass-ionomer luting cements and one resin cement to treated and untreated DICOR®, enamel, and dentin surfaces. Forty "cerammed" DICOR® specimens were assigned to four groups: (1-3) grit-blasting and bonding to each of the three glass-ionomer cements; and (4) acid-etching, silane coating, and bonding to the resin cement. Seventy enamel specimens were assigned to seven groups: (1-3) no etching and bonding to each of the glass-ionomer cements; (4-7) acid-etching and bonding to the glass-ionomer cements and the resin cement. Seventy dentin specimens were assigned to seven groups: (1-4) bonding to each of the three glass-ionomer cements and the resin cement; (5-7) polyacrylic acid preconditioning and bonding to each of the three glass-ionomer cements. The mean resin cement bond strengths (MN/m²) to DICOR® (9.4) and to etched enamel (10.7) were significantly greater (p<0.01) than those of the glass-ionomer cements (DI-COR®, 0.8-1.2 ; enamel, 0.4-0.9). Preconditioning of enamel and dentin significantly increased (p<0.05) the bond strengths to the glass-ionomer cements. The mean bond strength of the resin cement to untreated dentin (4.3) was significantly higher (p<0.05) than the glass-ionomer bond strengths to untreated dentin (1. 0-1.7) and to preconditioned dentin (2.1-3.3). The high bond strengths achieved with the resin cement are encouraging. Selected surface treatment of DICOR®, enamel, and dentin prior to luting should be clinically useful.

Get full access to this article

View all access options for this article.

References

Bailey, L.F. and Bennett, R.J. (1988): DICOR® Surface Treatments for Enhanced Bonding , J Dent Res 67:925-931.

Coury, T.L. ; Miranda, F.J. ; Willer, R.D. ; and Probst, R.T. (1982): Adhesiveness of Glass-ionomer Cement to Enamel and Dentin: A Laboratory Study, Oper Dent 7:2-6.

Hobo, S. and Iwata, T. (1985): Castable Apatite Ceramics as a New Biocompatible Restorative Material. II. Fabrication of the Restoration, Quint Int 3:207-216.

Kemper, R. and Kilian, R. (1977): New Test System for Tensile Bond Strength Testing , IADR Prog & Abst 55:No. 308.

Khait, O.D. (1982): Controlling the Chemical Polishing Process, No. 3, translated from Steklo i Keramika, New York, NY: Plenum Publishing Corporation, pp. 133-137.

McInnes-Ledoux, P.M. ; Ledoux, W.R. ; and Weinberg, R. (1987): Bond Strength of Dentinal Bonding Agents to Chemomechanically Prepared Dentin, Dent Mater 3:331-336.

Negm, M.M. ; Beech, D.R. ; and Grant, A.A. (1982): An Evaluation of Mechanical and Adhesive Properties of Polycarboxylate and Glass Ionomer Cements, J Oral Rehabil 9 :161-167.

Rappold, A. ; McInnes-Ledoux, P.M. ; Zinck, J.H. ; Crowe, R.A. ; and Weinberg, R. (1987): Intra-coronal Cast Ceramic Restorations-an in vitro Investigation of Fit, J Dent Res 66:134, Abst. No. 218.