Objective: Several all-ceramic systems use zirconium oxide substructures and recommend a variety of commonly used luting agents. The objective of this study was to determine the effect of varying cement type on the maximum load to fracture value of Proceraź zirconium oxide copings. Methods: Thirty resin dies were individually scanned using the Proceraź CAD system and 30 corresponding zirconium copings of 0.7mm thickness were fabricated. Copings were cemented to the dies with 3 cement types as per manufacture's instructions: group 1 with zinc phosphate cement (Alphadent, Dental Technologies. Linwood, IL.); group 2 with resin re-enforced glass ionomer cement (FujiCem, GC Corp. Tokyo, Japan.); and group 3 with resin cement (Panavia 21, Kuraray America, Inc. NY, NY.). Cemented copings were stored in 100% humidity for 24 hours prior to applying a controlled compressive force at a cross-head speed of 0.5mm/min until fracture occurred. Results: Mean and standard deviation maximum load to fracture values were as follows: zinc phosphate 607.149N ± 106.935N; resin 669.097N ± 98.977N; resin re-enforced glass ionomer 823.551 N ± 95.625N. Fisher's PLSD analysis revealed a statistically significant difference between the resin re-enforced cement versus both the resin and zinc phosphate cements (p-value <.0001). Conclusions: Bite forces on natural teeth have been reported to average 665N, 450N, and 220N for molar, premolar, and incisor teeth respectively. Based on the findings of this study, zirconium oxide copings cemented with resin re-enforced glass ionomer cement (FujiCem) would have acceptable load to fracture values for use in posterior as well as anterior applications.

Supported by NobelBiocare/University of Michigan Center for Excellence

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