title: [Cervical discrepancies and closeness of marginal fit of full cast crowns in correlation with the luting agent used].
abstract: In an in-vitro study 75 extracted teeth were prepared with a chamfer and a 12 degree convergence angle. After corrective impression taking and preparation of the dies accurately fitting caps were made of "Stabilor G" alloy. The marginal defects were measured at 4 points on each tooth under the light-microscope before and after cementing with three different luting agents. Before cementation the mean values and standard deviation of the cervical discrepancies were 105 +/- 43 microns. The crowns fixed by means of zinc oxyphosphate cement (Harvard) exhibited marginal defects of 142 +/- 33 microns, those fixed with Fuji-Ionomer type I glass polyalkenoate cement had 159 +/- 20 microns, and the crowns cemented with Ketac-Cem had 127 +/- 6 microns. After exposing the specimens to thermal cycling, additional data on the sealing capacity of these cements could be obtained which showed zinc oxyphosphate cement to have the most favorable properties.
authors.forename: K H
authors.initials: KH
authors.lastname: Utz
authors.forename: M
authors.initials: M
authors.lastname: Grüner
authors.forename: R
authors.initials: R
authors.lastname: Vothknecht
mesh_terms: D002484:Cementation; D003442:Crowns; D003722:Dental Alloys; D003738:Dental Cements; D003763:Dental Leakage; D005899:Glass Ionomer Cements; D006801:Humans; D008277:Magnesium Oxide; D011076:Polycarboxylate Cement; D013499:Surface Properties; D015032:Zinc; D015034:Zinc Oxide
chemical_list: D003722:Dental Alloys; D003738:Dental Cements; D005899:Glass Ionomer Cements; D011076:Polycarboxylate Cement; D008277:Magnesium Oxide; C037885:Fuji-ionomer; C040235:Ketac-cem; D015032:Zinc; D015034:Zinc Oxide
vernacular_title: Zervikale Diskrepanzen und Randschlussdichte von Vollgusskronen in Abhängigkeit vom Befestigungszement.