Fracture Strength of Dentin-bonded Crowns Luted with a Self-adhesive Resin-luting Material

*1651 Fracture Strength of Dentin-bonded Crowns Luted with a Self-adhesive Resin-luting Material*
F.J.T. BURKE¹, G.J. FLEMING¹, and B. WINDMUELLER², ¹ University of Birmingham, United Kingdom, ² 3M ESPE, Seefeld, Germany Objectives: This paper examined the fracture strength of dentine-bonded crowns luted with a novel, self-adhesive, encapsulated, resin-based luting materal¹ and compares this with the strength of crowns constructed in feldspathic porcelain luted, following etching and bonding, with a resin-based luting material ² . Methods: Twenty sound maxillary premolars, free from caries and cracks, and selected using strict criteria, were mounted in acrylic resin in stainless steel moulds. Teeth were prepared for full crowns similar to previous investigations, namely, 2mm occlusal reduction, 60 taper and minimal shoulder. Standardised crowns were constructed in feldspathic porcelain. Ten crowns were luted to the prepared teeth using RelyX Unicem ¹ (Group RU), ten using a dentine bonding agent after etching of the tooth surface with 37% phosphoric acid and luted using a conventional resin luting material ² (Mirage ABC/FLC:Group M). Compressive force was applied through a 4mm stainless steel bar applied to the occlusal surface of the restored specimens. Results: A mean fracturing force of 0.89 kN (SD 0.22) was recorded for the specimens of group RU and 0.76 kN (SD 0.27) for the specimens of group M. Comparison of the fracturing forces of the two groups using a Scheffe Test indicated that the force to fracture of dentine-bonded crowns of group RU was not significantly different to that of similar crowns in group M. The fracture mode of the crowns of group RU was less severe, than in 50% of the specimens of group M. Conclusion: In vitro fracture resistance of dentine-bonded crowns luted with a novel self-adhesive resin luting material was not significantly different to that of similar crowns luted, after etching and bonding, with a conventional resin cement. 1:RelyX Unicem: 3M ESPE, Seefeld, Germany. 2:Mirage ABC/FLC: Chameleon Dental Products, Kansas City, KN, USA. The support of 3M ESPE (Seefeld, Germany) is acknowledged.
Seq #207 - Ceramics: Surface Treatment, Surface Chemistry, and Bonding 11:00 AM-12:15 PM, Saturday, 15 March 2003 Henry B. Gonzalez Convention Center Exhibit Hall C
Back to the Dental Materials: III - Ceramics and Cements Program Back to the 32nd Annual Meeting and Exhibition of the AADR (March 12-15, 2003)
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