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Published on: March 8, 2019
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A Newly Formulated Vinyl Polysiloxane Impression Material with Improved Mechanical Properties.
Long Ling1, Theresa Lai1, Raj Malyala1
1R&D, Glidewell Dental, Irvine, CA 92612, USA.
Summary
A new vinyl polysiloxane (VPS) impression material shows superior tear strength and elongation, with adequate tensile strength. This experimental VPS material is suitable for dental impressions and fabricating restorations.
Area of Science:
- Dental Materials Science
- Polymer Science
- Biomaterials Engineering
Background:
- Accurate dental impressions are crucial for successful restoration fabrication.
- Vinyl polysiloxane (VPS) materials are widely used due to their dimensional stability and accuracy.
- Evaluating the mechanical properties of new VPS materials is essential for clinical application.
Purpose of the Study:
- To evaluate the mechanical properties of a novel vinyl polysiloxane (VPS) impression material.
- To compare the tear strength, tensile strength, and elongation at break of the experimental VPS material against established commercial brands.
Main Methods:
- Mechanical properties (tear strength, tensile strength, elongation at break) were tested on eight VPS impression materials.
- Specimen preparation and testing followed ASTM-D624 and ISO 37 standards.
- Testing was performed using a Shimadzu universal testing machine at a crosshead speed of 500 mm/min, with data analyzed by one-way ANOVA.
Main Results:
- The experimental VPS material exhibited significantly higher tear strength and elongation at break for both light body (LB) and heavy body (HB) formulations compared to other materials.
- Tensile strength of the experimental material was comparable to most, but lower than Imprint 3 and Start VPS for LB, and higher than others (except Start VPS) for HB.
- Correlations between tear strength and tensile strength varied (none for LB, weak-moderate for HB), as did the relationship between elongation at break and tensile strength (moderate inverse for LB, very weak for HB).
Conclusions:
- The experimental VPS impression material demonstrated superior tear strength and elongation at break, alongside adequate tensile strength, compared to commercial alternatives.
- These robust mechanical properties suggest the experimental material can yield accurate impressions, vital for clinical success.
- The new experimental VPS material is deemed suitable for use in dental impressions for the fabrication of restorations.
Keywords:
ElongationVPS impression materialmechanical propertiestear strengthtensile strengthvinyl polysiloxane (VPS)More Related Videos
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