Submitted: 09 Mar 2009
Accepted: 25 Feb 2013
ePublished: 25 Feb 2013
EndNote EndNote

(Enw Format - Win & Mac)

BibTeX BibTeX

(Bib Format - Win & Mac)

Bookends Bookends

(Ris Format - Mac only)

EasyBib EasyBib

(Ris Format - Win & Mac)

Medlars Medlars

(Txt Format - Win & Mac)

Mendeley Web Mendeley Web
Mendeley Mendeley

(Ris Format - Win & Mac)

Papers Papers

(Ris Format - Win & Mac)

ProCite ProCite

(Ris Format - Win & Mac)

Reference Manager Reference Manager

(Ris Format - Win only)

Refworks Refworks

(Refworks Format - Win & Mac)

Zotero Zotero

(Ris Format - Firefox Plugin)

J Iran Dent Assoc. 2009;20(4): 286-291.
  Abstract View: 19

Research

Die dimension variation in three impression taking methods

Zafar Mahdavy-Izady, Ezatollah Jalalian*, Morteza Neshandar, Azar Arazm-Sa, Ana Meyhami
*Corresponding Author: Email: Dr_E_Jalalian@yahoo.com

Abstract

Die dimension variation in three impression taking methods

Dr. Mahdavy-Izady Z.,1 Dr. Jalalian E.,2 Dr. Neshandar M.,3 Dr. Arazm-Sa A.4 Meyhami A.5

1 Assistant Professor, Prostodontics Department, Faculty of Dentistry, Islamic Azad University. Tehran, Iran. 2Associate Professor, Prostodontics Department, Faculty of Dentistry, Islamic Azad University. Tehran, Iran. 3 Member of Faculty, Prostodontics Department, Faculty of Dentistry, Islamic Azad University, Tehran, Iran. 4 Dentist. 5 Dental Student.

(Received 9 March, 2008 Accepted 19 Oct, 2008)

Abstract

Background and Aim: Dimensional stability of die plays very important role in fixed prosthodontic treatments. Different impression taking techniques may be the main source of die dimensional changes. However, in this regards, contradictory results have been reported in the literature. This study was designed to assess the dimensional accuracy of master casts prepared by means of three impression techniques using Speedex silicone impression material.

Materials and Methods: This quasi-experimental study was carried out using laboratory stainless steel master models that contained three complete crown abutment preparations. The one-step, two-step with and without relief methods were the three putty-wash impression techniques used in this investigation. Fifteen impressions were taken for each technique and velmix casting material was used to prepare stone models. Profile Projector and micrometer were used to measure the final die’s height, diameter and different dimensions in order to compare them with laboratory model. ANOVA and paired samples t-test were used for data analyses.

Results: The two step technique with spacer was the most accurate method with zero LC distance (distance between left and middle abutment). However, in the other two techniques, the mean difference was 0.22 (± 0.01), (P<0.05). Regarding the distances between abutments, there was no significant difference when comparing one-stage and two-stage technique without spacer. Although, the height of abutment was more accurate in two-stage technique without spacer than one-stage.

Conclusion: The two-step technique with spacer was the most accurate technique when using Speedex impression material.

Keywords: Dimensional accuracy - Impression technique - Impression material - Silicone.

Corresponding Author: Dr. Jalalian E., Associate Professor, Prostodontics Department, Faculty of Dentistry, Islamic Azad University, Tehran, Iran.

e.mail: Dr_E_Jalalian@Yahoo.Com

First Name
Last Name
Email Address
Comments
Security code


Abstract View: 20

Your browser does not support the canvas element.


PDF Download: 0

Your browser does not support the canvas element.