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Related Concept Videos

Flow Table Test01:12

Flow Table Test

The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...

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Flow profile of regular and fast-setting elastomeric impression materials using a shark fin testing device.

Nathaniel C Lawson1, Deniz Cakir, Lance Ramp

  • 1Department of Prosthodontics, University of Alabama at Birmingham, Birmingham, AL 35295-0007, USA. nlawson@uab.edu

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Summary

Polyether impression materials exhibit superior flow compared to vinyl polysiloxane and hybrid types, making them ideal for detailed dental impressions. This enhanced flow is crucial for accurately capturing preparation margins in complex dental cases.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Clinical Dentistry

Background:

  • Accurate dental impressions require light-bodied materials with sustained flow to capture fine preparation margins.
  • Multiple dental preparations present a challenge for impression material flow and detail reproduction.

Purpose of the Study:

  • To compare the flow characteristics of five different dental impression materials over time.
  • To evaluate the flow of vinyl polysiloxane, polyether, and hybrid materials with fast and regular setting times.

Main Methods:

  • Flow was quantified using a standardized "shark fin" testing apparatus.
  • Impression materials were subjected to controlled drops, and flow was measured at 30-second intervals.
  • Data were analyzed using two-way ANOVA and Tukey's HSD post hoc tests.

Main Results:

  • Significant differences in flow were observed among the tested impression materials and across time intervals (p=0.05).
  • Polyether impression materials demonstrated significantly greater flow compared to vinyl polysiloxane and hybrid materials.

Conclusions:

  • Polyether impression materials possess a superior flow profile compared to vinyl polysiloxane and hybrid materials.
  • For impressions with deep subgingival margins or multiple preparations, polyether materials are recommended due to their enhanced flow properties.