Effect of surface finish on the flexural strength of feldspathic and aluminous dental ceramics.
The effects of surface finish on flexural strength of a feldspathic porcelain, aluminous porcelain, and a computer aided design-computer aided machining porcelain (Vitabloc MKI) were examined. A total of 105 bars of the feldspathic ceramic were made, randomly divided into seven groups, and sintered according to manufacturer's recommendations. The groups consisted of as-fired, self-glazed, overglazed, ground, polished, ground/annealed, and polished/annealed. A total of 45 bars of the aluminous ceramic and Vitabloc MKI were made and randomly divided into three groups: as-fired, ground, and polished. Overglazing, grinding, and polishing all significantly increased (P < .05) the flexural strength (four-point-bend test) of the tested materials (15% to 30%).
Giordano
R
R
Department of Biomaterials, Goldman School of Graduate Dentistry, Boston University, Massachusetts 02118, USA.
Cima
M
M
Pober
R
R
D000537:Aluminum Oxide / Q000737:chemistry; D000704:Analysis of Variance; D017076:Computer-Aided Design; D003722:Dental Alloys / Q000737:chemistry; D003775:Dental Polishing; D003776:Dental Porcelain / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D013499:Surface Properties; D013674:Technology, Dental / Q000379:methods; D013718:Tensile Strength
D003722:Dental Alloys; C096477:Vitabloc MK1; D003776:Dental Porcelain; C058236:Vitadur N; C047040:Vita VMK 68; D000537:Aluminum Oxide