Flexural strength of In-Ceram alumina and In-Ceram zirconia core materials.
OBJECTIVE
The study compared the flexural strength of In-Ceram alumina and In-Ceram zirconia systems. The probability of failure of the two glass-infiltrated ceramic core materials was analyzed with and without lamination with Vitadur-alpha porcelain.


METHODS
Ten uniform beams of core materials as well as 10 beams of laminated core materials were fabricated for In-Ceram alumina and In-Ceram zirconia. The samples were subjected to three-point bending tests. Flexural strength for both ceramic core materials was determined with and without their porcelain laminations. The strength data were analyzed using the Weibull method. Modes of failure for both systems were determined using scanning electron micrography.


RESULTS
The strength of the In-Ceram zirconia system was significantly higher than In-Ceram alumina when comparing their core materials with and without porcelain lamination. The failure mode for both systems was predominantly transgranular fracture of alumina platelets.


CONCLUSIONS
In-Ceram zirconia demonstrated higher flexural strength than In-Ceram alumina.
Chong
Kok-Heng
KH
Department of Biologic and Materials Sciences, Division of Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109-1078, USA. kchong@umich.edu
Chai
John
J
Takahashi
Yutaka
Y
Wozniak
Wayne
W
D000537:Aluminum Oxide / Q000737:chemistry; D000704:Analysis of Variance; D002516:Ceramics / Q000737:chemistry; D019245:Compressive Strength; D003764:Dental Materials / Q000737:chemistry; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D003801:Dental Veneers; D004548:Elasticity; D005898:Glass; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D011176:Post and Core Technique; D011336:Probability; D015040:Zirconium / Q000737:chemistry
D003764:Dental Materials; C111324:vitadur alpha omega; D003776:Dental Porcelain; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide