title: Effects of cement, cement space, marginal design, seating aid materials, and seating force on crown cementation.
abstract: An evaluation of the effects of a die spacer, the seating force, the marginal design, seating aid materials, and the cement type during cementation was conducted. Two stainless steel dies were used: one with a 1 mm shoulder and the other with a shoulder and a 65-degree bevel. Ten stone dies were produced from each metal die and half were painted with four layers of die spacer. The crowns were waxed on the dies and cast in a nonprecious alloy, and the seating of crowns was measured with a micrometer before and after cementation. Comparisons were made between zinc phosphate and glass ionomer cements under two seating forces of 5 and 30 lb using an orangewood stick or E-Z-bite seating aid. ANOVA and the Newman-Keuls test revealed that the use of a die spacer, a heavier force of 30 lb, and glass ionomer cement significantly improved crown seating. The beveled preparation led to superior crown seating when the heavier force or glass ionomer cement was used. The orangewood stick and bite device had a similar effect on crown seating.
authors.affiliation: Boston University, Henry M. Goldman School of Graduate Dentistry, Mass.
authors.forename: C J
authors.initials: CJ
authors.lastname: Wang
authors.forename: P L
authors.initials: PL
authors.lastname: Millstein
authors.forename: D
authors.initials: D
authors.lastname: Nathanson
mesh_terms: D002484:Cementation / Q000379:methods*; D002858:Chromium Alloys / Q000737:chemistry; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry; D003734:Dental Casting Investment / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry*; D003764:Dental Materials; D003799:Dental Stress Analysis; D003779:Denture Design / Q000295:instrumentation / Q000379:methods; D005069:Evaluation Studies as Topic; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D003734:Dental Casting Investment; D003738:Dental Cements; D003764:Dental Materials; D005899:Glass Ionomer Cements; C036884:Rexillium III; D015036:Zinc Phosphate Cement