Accuracy and dimensional stability of a combined hydrocolloid impression system.
The accuracy of a combined hydrocolloid impression system was studied as a function of time of pour. There was little change in dimension between posts for all time intervals studied. No statistically significant differences were noted among the observation periods until 3 hours. The results indicate that for the impression system studied, a 3-hour pouring time can be used for transport to a commercial dental laboratory, provided the impressions are stored in 100% relative humidity. The hydrocolloid impression system tested resulted in a stone cast of slightly deviating dimensions compared with the master model. Therefore laboratory procedures should compensate for cement thickness, taking into account the minimal changes in dimensions of the die.
Peters
M C
MC
Department of Cariology and Endodontology, TRIKON, Institute for Dental Clinical Research, University of Nijmegen, The Netherlands.
Tieleman
A
A
D000464:Alginates / Q000737:chemistry; D002133:Calcium Sulfate; D003102:Colloids / Q000737:chemistry*; D003760:Dental Impression Materials / Q000737:chemistry*; D006813:Humidity; D008422:Materials Testing; D003765:Models, Dental; D013499:Surface Properties; D013997:Time Factors
D000464:Alginates; D003102:Colloids; D003760:Dental Impression Materials; C050135:cavex; D002133:Calcium Sulfate