Linear Dimensional Changes in Elastic Impression Materials

Abstract

Four classes of elastomeric impression materials (polysulfide, polyether, silicone, and agar-agar) were evaluated on the basis of linear dimensional stability as a function of time between taking and pouring an impression of mounted teeth. Four polysulfide materials produced dies which were larger than the teeth and generally increased in size with impression storage time. One silicone material produced dies slightly smaller than the teeth, and the dies from another silicone were dramatically smaller with increasing storage times. A polyether material produced slightly smaller dies for up to four hours' storage time, then increasingly larger dies up to 24 h. The dies from a reversible hydrocolloid were larger than the teeth for storage times up to 30 min, and then decreased rapidly at longer times.

Get full access to this article

View all access options for this article.

References

Reisbick, M.H. and Matyas, J. : The Accuracy of Highly Filled Elastomeric Impression Materials, J Prosthet Dent 33:67-72, Jan., 1975.

Bell, J.W. and Von Fraunhofer, J.A. : The Handling of Elastomeric Impression Materials: A Review, J of Dent 3:229-237, 1975.

Bell, J.W. ; Davies, E.H. ; and Von Fraunhofer, J.A. : The Dimensional Changes of Elastomeric Impression Materials Under Various Conditions of Humidity, J of Dent 4: 73-74, 1976.

Mansfield, M.A. and Wilson, H.J. : Elastomeric Impression Materials , Brit Dent J 139:267-273,1975.

Hembree, J.H. : Comparative Accuracy of Impression Materials Used for Indirect Technics, Tex Dent J 94:6-8, Sept., 1976.

Kaloyannides, T.M. : Mixtures of Elastomer Impression Materials of the Same Group. II. Permanent Deformation , J Dent Res 53:1491-1494, Nov.-Dec., 1974.

Jorgenson, K.D. : A New Method of Recording the Elastic Recovery of Dental Impression Materials, Scand J Dent Res 84: 175-182,1976.

Brown, D. : Factors Affecting the Dimensional Stability of Elastic Impression Materials , J of Dent 1:265-274, 1973.

Stackhouse, J.A. : A Comparison of Elastic Impression Materials , J Prosthet Dent 34:305-313, Sept., 1975.

10.

Lacey, A.M. ; Bellman, T. ; and Jendre-Sen , M.D. : Time-dependent Accuracy of Elastomeric Impression Materials, IADR Progr & Abst 57:No. 36, 1978.

11.

Hollenback, G.M. and Smith, D.D. : A Further Study of the Physical Properties of Elastic Impression Materials, South Calif Dent A J 33:32-36, 1965.

12.

Skinner, E.W. and Phillips, R.W. : The Science of Dental Materials , 7th ed., W. B. Saunders Co. , 1973.