Influence of different flask systems on tooth displacement and framework misfit in mandibular fixed implant-supported complete dentures

Author(s)

Caetano, Conrado Reinoldes ^[1] ; Xediek Consani, Rafael Leonardo ^[1] ; Bacchi, Atais ^[1] ; Correr, Americo Bortolazzo ^[1] ; Fernandes dos Santos, Mateus Bertolini ^[1]

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Piracicaba, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF PROSTHODONTIC RESEARCH; v. 57, n. 3, p. 213-218, JUL 2013.
• Web of Science Citations: 1

Abstract

Purpose: To evaluate the influence of different metallic flask systems for acrylic resin denture processing on tooth displacement and framework misfit of mandibular fixed implant-supported complete dentures. Methods: Standard mandibular implant-supported complete dentures in five implants were waxed and randomly assigned to three groups: 01 conventional flask, G2 double flask, and 03 occlusion flask. Framework misfit in all the implants and the linear distances between teeth (I-I incisor-to-incisor; P-P premolar-to-premolar; M-M molar-to-molar; RI-RM right-incisor-to-right-molar; and LI-LM left-incisor-to-leftmolar) were measured before and after denture processing using an optical microscope. Dentures were processed by hot water curing cycle (9 h/ 74 C). Collected data were analyzed by paired Student's t-test and one-way ANOVA (a = 0.05). Results: All the measured distances presented changes in tooth displacement after denture processing. However, the M-M distance for G1 (p= 0.003) and the P-P (p= 0.042) and LI-LM (p= 0.044) distances for 03 showed statistically significant differences. Differences between the flask systems were not statistically significant. Statistically significant differences in the framework misfit due to denture processing were found for all the implants and groups, with the exception of right median implant for 02 and right distal implant for 03. A comparison of the flask systems found statistically significant differences in which 01 presented an increase in the misfit values and 02 and 03 a decrease. Conclusions: Different flask systems did not cause significant changes in tooth displacement. Frameworks misfit values were influenced by the different flask systems. The conventional flask presented an increase in the framework misfit, while the experimental flasks showed a decrease. C) 2013 Japan Prosthodontic Society. Published by Elsevier Ireland. All rights reserved. Keywords: Acrylic resin; Passive fit; Polymerization shrinkage; Denture processing; Implant-borne prosthesis (AU)

• FAPESP's process: 10/16334-7 - Influence of different flask types on teeth displacement of lower implant-retained complete dentures
• Grantee: Conrado Reinoldes Caetano
• Support Opportunities: Scholarships in Brazil - Scientific Initiation