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VOLUME 17 , ISSUE 2 ( February, 2016 ) > List of Articles


Assessment of a Synthetic Type IV Cast and a Resin Polyol Used in the Fabrication of Dental Models

Rudys Rodolfo de Jesus Tavarez, Stéphanye T Carvalhal, Mário GN Gomes, Adriana S Malheiros, Letícia M Gonçalves, Etevaldo M Filho

Citation Information : de Jesus Tavarez RR, Carvalhal ST, Gomes MG, Malheiros AS, Gonçalves LM, Filho EM. Assessment of a Synthetic Type IV Cast and a Resin Polyol Used in the Fabrication of Dental Models. J Contemp Dent Pract 2016; 17 (2):160-164.

DOI: 10.5005/jp-journals-10024-1820

Published Online: 01-07-2016

Copyright Statement:  Copyright © 2016; The Author(s).



To evaluate the dimensional changes, reproduction of details, and surface roughness of a type IV cast and a resin used to fabricate dental models.

Materials and methods

Two commercial brands of materials were evaluated: a type IV synthetic cast (Fuji Rock) and a polyol resin (Novox). Twenty samples were obtained from polyvinyl siloxane molds that reproduced the surface of a metal master model standardized according to the American National Standards Institute/American Dental Association specification no. 19. The materials were used according to the manufacturer's instructions and divided into two groups (n = 10). Each mold was photographed immediately after molding and 1 hour after molding. The obtained models were also photographed and measurements were obtained by using Image J software. The paired t-test was used to compare the molding materials and one-way analysis of variance (ANOVA) was used to compare the dimensional changes between the groups at a significance level of 5%.


Statistically significant differences were observed between the models fabricated with the polyol resin and type IV synthetic cast with regard to reproduction of surface details, surface roughness, and dimensional stability (p < 0.05), with the resin providing superior surface detail reproduction and greater dimensional accuracy.


The polyol resin exhibited superior behavior regarding detail reproduction, surface roughness, and dimensional change compared with the type IV synthetic cast.

How to cite this article

Carvalhal ST, Gomes MGN, Malheiros AS, Gonçalves LM, Bandeca MC, Filho EM, De Jesus Tavarez RR. Assessment of a Synthetic Type IV Cast and a Resin Polyol Used in the Fabrication of Dental Models. J Contemp Dent Pract 2016;17(2):160-164.

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