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Related Experiment Videos

Relationship between critical convergence angle and surface defects in stone casts.

G Soh1, Y H Chong

  • 1Faculty of Dentistry, National University of Singapore 0511.

Quintessence International (Berlin, Germany : 1985)
|August 1, 1990
PubMed
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Surface defects on stone casts, like voids, can reduce restoration accuracy. This study found a link between critical convergence angle and void formation, with polyether materials showing better results than silicones for accurate dental casts.

Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Casting Technology

Background:

  • Surface defects on stone casts compromise the precision of dental restorations.
  • Understanding factors influencing void formation is crucial for improving cast accuracy.

Purpose of the Study:

  • To investigate the correlation between critical convergence angle and the occurrence of voids in stone casts.
  • To compare void formation in casts made from different impression materials.

Main Methods:

  • Evaluated three addition silicone, one condensation silicone, and one polyether impression material.
  • Recorded the critical convergence angle at which voids appeared on specimen tips.
  • Quantified voids at margins and line angles of tooth preparations.

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Main Results:

  • A significant positive correlation was observed between critical convergence angle and the number of voids.
  • Stone casts from polyether impressions exhibited significantly lower critical convergence angles.
  • Polyether-based casts presented fewer voids compared to silicone-based casts.

Conclusions:

  • Critical convergence angle is a key factor influencing void formation in stone casts.
  • Polyether impression materials yield stone casts with superior accuracy and fewer defects than silicone materials.