title: Effects of ion exchange on hardness and fracture toughness of dental ceramics.
abstract: Dental ceramics generally fail because of the growth of microscopic surface flaws that form during processing or finishing or that result from surface impact during service. The ion-exchange process has been shown to be effective in improving the flexural strength of most dental porcelains through the development of a compressive surface layer. The Vickers hardness and crack resistance of several commercial dental ceramics were determined by indentation techniques. The results of this investigation indicate that ion-exchange reinforcement can significantly improve the resistance of the ceramic surface to crack propagation with little effect on apparent surface hardness.
authors.affiliation: College of Dentistry, Ohio State University, Columbus.
authors.forename: R R
authors.initials: RR
authors.lastname: Seghi
authors.forename: I
authors.initials: I
authors.lastname: Denry
authors.forename: F
authors.initials: F
authors.lastname: Brajevic
mesh_terms: D000704:Analysis of Variance; D003776:Dental Porcelain / Q000737:chemistry*; D004548:Elasticity; D006244:Hardness; D006245:Hardness Tests; D007474:Ion Exchange; D008422:Materials Testing; D013718:Tensile Strength
chemical_list: D003776:Dental Porcelain