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2. Compressive strength of two modern all-ceramic crowns;Probster;Int J Prosthodont,1992
3. Flexural strength of infused ceramic, glass ceramic and feldspathic porcelain;Giordano;J Prosthet Dent,1995
4. A survey of crown and fixed partial dentures failures: length of service and reasons for replacement;Walton;J Prosthet Dent,1988