Peters M C, Tieleman A
Department of Cariology and Endodontology, TRIKON, Institute for Dental Clinical Research, University of Nijmegen, The Netherlands.
J Prosthet Dent. 1992 Jun;67(6):873-8. doi: 10.1016/0022-3913(92)90605-a.
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.
