Fracture strength of full-contoured ceramic crowns and porcelain-veneered crowns of ceramic copings.
This is vitro study compared the fracture strength of Dicor ceramic crowns with a 1 mm axial wall thickness and a 2 mm occlusal thickness with Dicor copings veneered with Vitadur-N or Dicor-Plus porcelain to create similar contours. Tooth preparations for complete crowns were made on human molars with a 10-degree total convergence and a 1 mm shoulder. The artificial crowns were internally etched, given an application of silane, and cemented with a dual-cured resinous cement. After thermocycling, each sample was loaded to failure with a vertical load on the occlusal surface. There were no significant differences in fracture strength between full-contour Dicor crowns and crowns of copings veneered with either Vitadur-N or Dicor-Plus porcelain.
Ferro
K J
KJ
Department of Prosthodontics, University of Connecticut, School of Dental Medicine, Farmington.
Myers
M L
ML
Graser
G N
GN
D000704:Analysis of Variance; D001732:Bite Force; D002516:Ceramics / Q000737:chemistry; D003442:Crowns; D003776:Dental Porcelain; D003801:Dental Veneers; D006801:Humans; D008422:Materials Testing; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013718:Tensile Strength
C047475:Dicor ceramic; D003776:Dental Porcelain