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CC BY 4.0 · Eur J Dent
DOI: 10.1055/s-0045-1809313
Original Article

The Influence of Pressing Methods on the Change of Vertical Dimension of Occlusion in Full Dentures

Alexandre Luiz Carvalho de Oliveira
1   Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil
,
Kusai Baroudi 
2   Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman, United Arab Emirates
3   Centre of Medical and Bio-allied Health Sciences Research, Ajman, United Arab Emirates
4   School of Dentistry, University of Taubaté, Taubaté, SP, Brazil
,
Musab Hamed Saeed 
2   Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman, United Arab Emirates
3   Centre of Medical and Bio-allied Health Sciences Research, Ajman, United Arab Emirates
,
Francisco Carlos dos Santos Reis
5   Department of Implantology, School of Dentistry, University Santo Amaro, São Paulo, SP, Brazil
,
Milton Edson Miranda
1   Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil
,
Rafael Pino Vitti
5   Department of Implantology, School of Dentistry, University Santo Amaro, São Paulo, SP, Brazil
,
William Cunha Brandt
5   Department of Implantology, School of Dentistry, University Santo Amaro, São Paulo, SP, Brazil
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Abstract

Objective

The objective of this study was to evaluate the alteration of the vertical dimension of occlusion (VDO) of full dentures when different pressing methods are used during the laboratory procedure.

Materials and Methods

Sixty specimens were divided into four groups (n = 15). In all cases, as an antagonist model, a standard assembly with cast alloy teeth was used, all the top pressed models were mounted in semiadjustable articulator through a metal reassembly plate. The vertical distance evaluation was performed by vertical measurement, using a digital caliper. The groups were divided as follows: group 1 (the muffle was not opened, and the space propitiator was not used), group 2 (the muffle was opened and the space propitiator was not used), group 3 (the muffle was not opened and the space propitiator was used), and group 4 (the muffle was opened and the space propitiator was used). In the four groups inclusions were carried out with zero expansion gypsum, 1000 kgf press, Vipi STG muffle and Vipi thermopolymerizable resin. The four groups were polymerized by the microwave power system with 800 watts of power.

Statistical Analysis

Statistical analysis was performed using one-way analysis of variance and Tukey's post hoc test (α  = 0.05).

Results

Groups 3 and 4 presented the smallest change in the vertical occlusion dimension.

Discussion

Given the methodology applied in this study, the space propitiator was able to act significantly in reducing the change in VDO. There are many factors related to dimensional changes in the bases of full dentures. The dimensional changes and its relationship with the movements of artificial teeth have been observed. Some studies have shown that fixing or not fixing the artificial teeth before pressing does not prevent tooth displacement during subsequent polymerization and flasking stages.

Conclusion

The use of the space provider was effective in decreasing the vertical occlusion dimension, while the opening of the muffle for removal of the excess acrylic resin proved to be dispensable.

Keywords

vertical occlusion dimension - acrylic resin - microwave system technique

Data Availability Statement

Data is available under request.




Publication History

Article published online:
30 May 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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