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Related Concept Videos

Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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Contact angle of unset elastomeric impression materials.

Timothy S Menees1, Rashmi Radhakrishnan2, Lance C Ramp3

  • 1Student, Department of Chemistry, University of Alabama at Birmingham, Birmingham, Ala.

The Journal of Prosthetic Dentistry
|July 19, 2015
PubMed
Summary

Newer hydrophilic elastomeric impression materials, including modified polyvinyl siloxane (PVS) and hybrid types, show improved wettability compared to traditional PVS. Saliva exhibits different wetting behavior than water on these unset materials.

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Area of Science:

  • Dental materials science
  • Surface chemistry
  • Biomaterials

Background:

  • Hydrophobic elastomeric impression materials pose challenges when saliva is present.
  • Development of hydrophilic materials aims to improve impression accuracy in moist oral environments.

Purpose of the Study:

  • To compare the contact angles of water and saliva on seven unset elastomeric impression materials.
  • To evaluate material wettability at various time points during the working time.

Main Methods:

  • Seven unset elastomeric impression materials (2 traditional PVS, 2 modified PVS, 1 polyether, 2 hybrid) were tested.
  • Contact angles of water and saliva were measured at five time points using a digital microscope.
  • Statistical analysis included generalized linear mixed models and ANOVA.

Main Results:

  • Modified PVS and one hybrid material demonstrated the lowest contact angles with water.
  • Traditional PVS and another hybrid material exhibited the highest contact angles with water.
  • Saliva showed lower contact angles on polyether, modified PVS, and one hybrid material compared to water.

Conclusions:

  • Modified PVS and certain hybrid materials offer superior hydrophilicity over traditional PVS materials.
  • Saliva's interaction with unset impression materials differs from water, resulting in lower contact angles on polyether-based materials.