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Related Experiment Videos

Custom-cast post fabrication with a thermoplastic material

S F Rosenstiel1, M F Land, J A Holloway

  • 1Section of Restorative Dentistry, Prosthodontics and Endodontics, College of Dentistry, Ohio State University, Columbus, USA.

The Journal of Prosthetic Dentistry
|February 1, 1997
PubMed
Summary

Fabricating custom-cast posts using thermoplastic resin and a plastic rod improves pattern accuracy. This method reduces voids, prevents undercuts from locking, and avoids resin fracture during removal.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics

Background:

  • Fabricating custom-cast posts with traditional methods using autopolymerizing resin and plastic rods can lead to pattern defects.
  • Common issues include voids, pattern locking in undercuts, and resin fracture during removal, compromising post fabrication.

Purpose of the Study:

  • To introduce and describe a novel system for fabricating custom-cast posts using thermoplastic resin.
  • To address and overcome the limitations associated with conventional autopolymerizing resin techniques.

Main Methods:

  • The described system utilizes a plastic support rod and a thermoplastic resin.
  • Custom post patterns are created by trimming the rod, heating the thermoplastic resin, and seating it into a lubricated prepared canal.

Main Results:

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  • The thermoplastic resin exhibits excellent flow, significantly reducing the incidence of voids in the post pattern.
  • The resin's elasticity allows for easy removal from undercuts without locking or fracturing, ensuring pattern integrity.

Conclusions:

  • The thermoplastic resin system offers an improved method for custom-cast post fabrication.
  • This technique enhances pattern accuracy, simplifies the fabrication process, and minimizes common procedural complications.