An experimental study on particular physical properties of several interocclusal recording media. Part I: consistency prior to setting.
OBJECTIVE
To evaluate the consistency prior to the setting of 5 elastomeric interocclusal recording materials in comparison with a wax and a zinc oxide-eugenol paste. This property is related to the viscosity as well as to the working and setting times of these materials.


METHODS
Testing of consistency was performed following a modification of the method described in ADA Specification No. 19, for elastomeric impression materials. Each one of the tested materials was mixed for 20 seconds and was then loaded into a 0.5 mL syringe. The material was syringed onto a 10 x 10 x 0.5 cm glass plate. A second 575 g glass plate was placed on top of the unset interocclusal registration material. A total of 10 samples were tested for each material. The surface area covered by the materials was measured with the help of a scanner and the use of appropriate computer software.


RESULTS
One-way ANOVA revealed significant differences among the materials (F = 889.493, p < 0.0005). According to Tukey's honest significant difference test, all materials were significantly different (p < 0.05) from one another. All polyvinylsiloxanes occupied a smaller area than that of the polyether and of the zinc oxide-eugenol paste.


CONCLUSIONS
Zinc oxide-eugenol paste was the most fluid of all materials tested. Polyvinylsiloxanes displayed less flow properties than polyether.
Michalakis
Konstantinos X
KX
Division of Graduate and Postgraduate Prothodontics, Tufts University School of Dental Medicine, Boston, MA, USA. kmichalakis@the.forthnet.gr
Pissiotis
Argiris
A
Anastasiadou
Vassiliki
V
Kapari
Danai
D
D000704:Analysis of Variance; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003760:Dental Impression Materials / Q000737:chemistry*; D020724:Elastomers / Q000737:chemistry*; D004987:Ethers / Q000737:chemistry; D006801:Humans; D007574:Jaw Relation Record; D008422:Materials Testing; D011145:Polyvinyls / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014783:Viscosity; D014885:Waxes / Q000737:chemistry; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
D003760:Dental Impression Materials; D020724:Elastomers; D004987:Ethers; D011145:Polyvinyls; D012833:Siloxanes; D014885:Waxes; D015035:Zinc Oxide-Eugenol Cement; C034183:vinyl polysiloxane