title: Castable glass ceramic crowns and their reaction to endodontic therapy.
abstract: The purpose of this investigation was to determine how castable glass (Dicor) crowns would react to both cold testing and endodontic access intervention. Full crown preparations were made on six extracted maxillary teeth. The teeth were then forwarded to Dentsply International, York, Pa. Six castable glass crowns were fabricated to fit these teeth and returned to us. Subsequently the teeth were dried and the crowns were cemented. Scanning electron micrographs of the cemented crowns were made, and endodontic access openings were drilled. The teeth were also cold tested with standard methods. The teeth were then again subjected to scanning electron microscopy to determine any changes the crowns might have undergone. One crown cracked around the gingival collar as scanning electron microscopy was performed. The other crowns did not exhibit any problems such as cracking or crazing from either the access openings or the cold testing.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Case Western Reserve University, Cleveland, Ohio.
authors.forename: B D
authors.initials: BD
authors.lastname: Cohen
authors.forename: J A
authors.initials: JA
authors.lastname: Wallace
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003080:Cold Temperature; D003442:Crowns; D003737:Dental Cavity Preparation; D003776:Dental Porcelain / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011076:Polycarboxylate Cement / Q000737:chemistry; D012390:Root Canal Therapy; D013314:Stress, Mechanical; D013499:Surface Properties; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: C047475:Dicor ceramic; D011076:Polycarboxylate Cement; D003776:Dental Porcelain; D015036:Zinc Phosphate Cement