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Dimensional Stability of a Preliminary Vinyl Polysiloxane Impression Material
Francisco Martins1, José Reis2, Ignacio Barbero Navarro3
1Centro de Investigação Interdisciplinar Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal. fmartins@egasmoniz.edu.pt.
Dentistry Journal
|August 4, 2019
Summary
Vinyl Polysiloxane (VPS) dental impressions show excellent dimensional stability. This study found minimal shrinkage in Imprint™ 4 Preliminary material, ensuring accuracy for oral rehabilitation over one week.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Prosthodontics
Background:
- Accurate and dimensionally stable dental impressions are crucial for successful oral rehabilitation.
- Vinyl Polysiloxane (VPS) materials are widely used for dental impressions due to their favorable properties.
Purpose of the Study:
- To evaluate the dimensional changes and stability of a specific first-impression VPS material (Imprint™ 4 Preliminary Penta™ Super Quick).
- To determine if the material exhibits clinically significant shrinkage over a one-week storage period.
Main Methods:
- Ten samples of the VPS material were fabricated using an automatic mixing machine (Pentamix 2) following ISO 4823:2000 standards.
- Dimensional stability was measured using laser interferometry (Michelson technique) at initial setting, 24 hours, and 1 week.
- Statistical analysis included a one-way repeated measures ANOVA to assess changes over time.
Main Results:
- The material exhibited minimal shrinkage: 0.29 ± 0.15% after setting, 0.32 ± 0.21% at 24 hours, and 0.30 ± 0.23% after 1 week.
- No statistically significant dimensional changes were observed in the VPS material over the one-week storage period.
- The observed shrinkage values were below the threshold for clinical significance.
Conclusions:
- Imprint™ 4 Preliminary VPS material demonstrates excellent dimensional stability.
- This material can be stored for up to one week without compromising its accuracy for dental impressions.
- The findings support the use of this VPS material in clinical settings requiring precise impression taking for oral rehabilitation.
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