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Related Experiment Videos

An accuracy evaluation of four removable die systems

J G Serrano1, X Lepe, J D Townsend

  • 1Department of Restorative Dentistry, University of Washington, Seattle, USA.

The Journal of Prosthetic Dentistry
|November 14, 1998
PubMed
Summary

This study found that four removable die systems offer comparable 3D accuracy for implant dentistry models. While all systems are accurate, the Pindex system minimized horizontal movement, and the brass dowel system reduced occlusogingival discrepancies.

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Area of Science:

  • Dental materials science
  • Prosthodontics
  • Implant dentistry

Background:

  • Accurate working cast models are crucial for implant dentistry.
  • Die stone expansion and removable die errors can compromise prosthesis fit.
  • Existing removable die systems claim enhanced accuracy.

Purpose of the Study:

  • To evaluate the 3-dimensional accuracy of four removable die systems.
  • To compare the precision of systems utilizing 1 or 2 pins for repositioning.

Main Methods:

  • Four systems (Belle de St. Claire, Pindex, DVA, brass dowel) were tested.
  • Master models were cast using type IV die stone.
  • Dimensional accuracy was analyzed using microscopy and mathematical rotation.

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Main Results:

  • Significant differences in accuracy were observed among the systems (P = .005).
  • All systems achieved accuracy within 0.055 mm of the master model.
  • Pindex showed minimal linear expansion (y-dimension); brass dowel had minimal reseating discrepancy (z-dimension).

Conclusions:

  • All four removable die systems demonstrated similar dimensional accuracy.
  • Pindex exhibited the least horizontal movement.
  • The brass dowel system provided the least occlusogingival reseating discrepancy.