International Journal of Experimental Dental Science

Register      Login

VOLUME 2 , ISSUE 1 ( January-June, 2013 ) > List of Articles

RESEARCH ARTICLE

Impression Materials and Storage Time Influence on Cast Models Accuracy

Daniela Araújo Veloso Popoff, Fabiana Santos Gonçalves, Wallace de Freitas Oliveira, Luiza Anjos Soares, Hugo Lemes Carlo, Adérito Soares da Mota, Carlos Jose Soares

Citation Information : Popoff DA, Gonçalves FS, Oliveira WD, Soares LA, Carlo HL, Mota AS, Soares CJ. Impression Materials and Storage Time Influence on Cast Models Accuracy. Int J Experiment Dent Sci 2013; 2 (1):18-23.

DOI: 10.5005/jp-journals-10029-1033

Published Online: 00-06-2013

Copyright Statement:  Copyright © 2013; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Background

There are a great amount of materials and techniques to use during dental prosthesis production that may confuse the dentist at the time of choice. Material's choice should be done considering ideal chemicophysical and biological properties and high detail reproduction.

Aims

The present study aimed to test the influence of differents impression materials and storage times on the dimensional accuracy of casting models.

Materials and methods

Four elastomeric materials– polysulfide, polyether, condensation silicone and addition silicone–were used to reproduce a master model of human teeth which were prepared for metaloceramic fixed prosthodontics. Six reference points were established on each tooth in order to determine four intervals: MD–mesial-distal, BL–buccal-lingual and CO–cervical-occlusal distance from premolar, and INT– interpillar distance–from the distal surface of the premolar to the mesial surface of the molar. The impressions were stored for half, 2 and 12 hours and pondered with a type IV gypsum.

Results

Cast measurements data were subjected to ANOVA (4 × 3), Tukey's – α = 0.05, Kruskal-Wallis and Dunn's tests – α = 0.05. The interaction between materials and storage time presented statistically significant for VP and CO intervals. For each storage time, materials presented dimensional alteration statistically significant.

Conclusion

Impression materials accuracy was affected by the storage time. All materials presented different dimensional accuracy when evaluated in a same period of time. Polysulfide was the only material that presented stable behavior over the time.

How to cite this article

Gonçalves FS, de Freitas Oliveira W, Soares LA, Carlo HL, da Mota AS, Popoff DAV, Soares CJ. Impression Materials and Storage Time Influence on Cast Models Accuracy. Int J Experiment Dent Sci 2013;2(1):18-23.


PDF Share
  1. A review of contemporary impression materials and techniques. Dent Clin N Am 2004;48:445-70.
  2. Effect of storage time on the viscoelastic properties of elastomeric impression materials. J Prosthodont Res 2012;56:11-18.
  3. Dimensional stability of irreversible hydrocolloid impression materials as a function of pouring time: A systematic review. J Prosthet Dent 2011;106:126-33.
  4. Volatilization of components from and water absorption of polyether impressions. J Dent 2006;34:134-38.
  5. The dimensional accuracy of four impression techniques with the use of additiontype silicone impression materials. J Clin Dent 2007;18:29-33.
  6. Effect of immersion disinfection of alginate impressions in sodium hypochlorite solution on the dimensional changes of stone models. Dent Mater J 2012;31:280-86.
  7. Dimensional accuracy of a new polyether impression material. Quintessence Int 2006;37:47-51.
  8. Fracture resistance of teeth restored with indirect composite and ceramic MOD systems. Quintessence Int 2004; 35:281-86.
  9. Dimensional accuracy of dental casts: Influence of tray material, impression material and time. J Prosthodont 2002;11:98-108.
  10. Influence of prolonged setting time on permanent deformation of elastomeric impression materials. J Prosthet Dent 2010;103:288-94.
  11. Phillips’ science of dental materials (11th ed). St. Louis: Elsevier 2003:212-31.
  12. Dimensional stability of casts obtained with polyether and addition reaction silicone after disinfection with sodium hypochlorite and peracetic acid. Rev Bras Odontol 2012;1: 55-60.
  13. The dimensional stability of impression materials and its effect on in vitro tooth wear study. Dent Mater 2011;27:253-58.
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.