title: Wear characteristics of polished and glazed lithium disilicate ceramics opposed to three ceramic materials.
abstract: This study compared the wear characteristics of a heat-pressed lithium disilicate ceramic material opposed to feldspathic porcelain, a lithium disilicate glass ceramic, and zirconia materials. Ceramic plate specimens were prepared from feldspathic porcelain (EX-3 nA1B), lithium disilicate glass ceramics (e.max CAD MO1/C14), and zirconia (Katana KT 10) and then ground or polished. Rounded rod specimens were fabricated from heat-pressed lithium disilicate glass ceramic (e.max press LT A3) and then glazed or polished. A sliding wear testing apparatus was used for wear testing. Wear of glazed rods was greater than that of polished rods when they were abraded with ground zirconia, ground porcelain, polished porcelain, or polished lithium disilicate ceramics. For both glazed and polished rods, wear was greater when the rods were abraded with ground plates. The findings indicate that application of a polished surface rather than a glazed surface is recommended for single restorations made of heat-pressed lithium disilicate material. In addition, care must be taken when polishing opposing materials, especially those used in occlusal contact areas. (J Oral Sci 58, 117-123, 2016).
authors.affiliation: Department of Fixed Prosthodontics, Nihon University School of Dentistry.
authors.forename: Osamu
authors.initials: O
authors.lastname: Saiki
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Koizumi
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Akazawa
authors.forename: Akihisa
authors.initials: A
authors.lastname: Kodaira
authors.forename: Kentaro
authors.initials: K
authors.lastname: Okamura
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D002516:Ceramics; D003775:Dental Polishing; D003776:Dental Porcelain / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: C493120:lithia disilicate; D003776:Dental Porcelain