The three-dimensional effects of adjustment and cementation on crown seating.
This study investigated the three-dimensional nature of crown fit and the effects of adjustment and luting. Standardized preparations were made on extracted premolars and impressions and dies made. Complete-coverage castings were fabricated using base metal alloy. The castings were placed on their respective teeth and measurements made. The castings were then adjusted using a silicone disclosing medium and remeasured. They were then assigned to one of five luting agent groups and cemented. A relative term describing tilting was defined. Casting adjustment decreased tilting and cementation increased tilting. Resin cements tilted castings significantly more than did zinc phosphate, glass-ionomer, or polycarboxylate cements.
Department of Restorative Dentistry, School of Dentistry, University of Southern California, Los Angeles.
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D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D002484:Cementation; D003188:Composite Resins; D003442:Crowns; D003738:Dental Cements; D003763:Dental Leakage / Q000517:prevention & control; D017267:Dental Prosthesis Design / Q000379:methods*; D006801:Humans; D008277:Magnesium Oxide; D008689:Methacrylates; D015588:Observer Variation; D010710:Phosphates; D011076:Polycarboxylate Cement; D019279:Resin Cements; D015034:Zinc Oxide; D015036:Zinc Phosphate Cement
D003188:Composite Resins; D003738:Dental Cements; D008689:Methacrylates; D010710:Phosphates; D011076:Polycarboxylate Cement; D019279:Resin Cements; C074811:Tenure adhesive; C031374:zinc polyacrylate; D008277:Magnesium Oxide; D017438:Bisphenol A-Glycidyl Methacrylate; C008691:NPG-GMA; D015036:Zinc Phosphate Cement; C040235:Ketac-cem; C049160:Den-Mat; C052304:Panavia EX; D015034:Zinc Oxide