Dimensional Stability of a Preliminary Vinyl Polysiloxane Impression Material

Abstract

Oral rehabilitation success depends upon the accuracy and dimensional stability of the impressions. The purpose of this study is to evaluate the dimensional changes of a first impression type VPS (Vinyl Polysiloxane) (Imprint™ 4 Preliminary Penta™ Super Quick, 3M ESPE™, St Paul, MN, USA). 10 samples were obtained from this silicone with an automatic mixing machine (Pentamix 2, 3M ESPE™, Seefeld, Germany) according to International Organization for Standardization (ISO) 4823:2000 and stored in the IPQ (Portuguese Institute for Quality) for one week. The measurements were performed by laser interferometry, according to the Michelson technique. The dimensional stability was calculated according to the formula specified in ISO (International Organization for Standardization) 4823:2000. A statistical analysis via a one-way repeated measures ANOVA was performed. The material shrinkage was 0.29 ± 0.15% after setting, 0.32 ± 0.21% at 24 h and 0.30 ± 0.23% after 1 week. No significant shrinkage of the silicone under investigation was found over time. This material can be stored for a week without the risk of clinically significant dimensional changes.

Cholangiopancreatography in cats: a post‐mortem comparison of MRI with fluoroscopy, corrosion casting and histopathology

“…to have a rather low material shrinkage. 44 The injection of contrast medium for FRCP before the casting is likely to have irritated the ducts as suggested previously for corrosion casting preparation 35 but the possible interaction between the contrast medium and VPS remains unknown.…”

“…Corrosion casting is subject to several flaws, and factors such as shrinkage of cast material, injection pressure, and contents (e.g., clots) remaining in the ductal structures have been reported to be involved 33 . However, VPS has been reported to have a rather low material shrinkage 44 . The injection of contrast medium for FRCP before the casting is likely to have irritated the ducts as suggested previously for corrosion casting preparation 35 but the possible interaction between the contrast medium and VPS remains unknown.…”

Conventional Dental Impressions vs. Impressions Reinforced with Rigid Mouthguards

“…Thus, an ideal impression material would require properties that include good dimensional stability over time, reproducibility, elasticity, short setting time, enough working time, etc. [8][9][10][11][12]. The dimensional stability (i.e., their capacity to maintain their shape for a long period of time) is somewhat in contradiction to elasticity, but the latter is essential after the setting of the materials, making it possible to remove impressions from the oral cavity without suffering deformations [12].…”

“…The dimensional stability (i.e., their capacity to maintain their shape for a long period of time) is somewhat in contradiction to elasticity, but the latter is essential after the setting of the materials, making it possible to remove impressions from the oral cavity without suffering deformations [12]. When using such materials, one must also consider the fact that the best accuracy of the materials is after they polymerized; later on, it decreases in a variable way, depending on the material [9][10][11].…”

In Vitro Microscopic Evaluation of Metal- And Zirconium-Oxide-Based Crowns’ Marginal Fit

“…Clinical success and longevity of restorations are determined by the mechanical, biological, and esthetic requirements. Further, a good impression also helps in the success of the prosthetic restoration [4]. Silicone elastomeric polymers are widely used in dentistry, and among them, polyvinyl siloxane is considered the first line of impression material for making prosthetic crowns and veneers due to its high accuracy and dimensional stability [5,6].…”