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Post-and-core assemblies made with an accelerated pattern elimination technique

J H Bailey1, D J Sherrard

  • 1College of Dentistry, Ohio State University, Columbus.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|March 1, 1994
PubMed
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Accelerated pattern elimination significantly alters casting dimensions compared to conventional methods. Phosphate investments require specific setting times for optimal results in dental casting procedures.

Area of Science:

  • Materials Science
  • Dental Technology
  • Manufacturing Processes

Background:

  • Accelerated pattern elimination offers potential productivity gains in dental casting.
  • Phosphate-bonded investments are commonly used in dental laboratories.
  • Evaluating new techniques is crucial for improving efficiency and accuracy.

Purpose of the Study:

  • To evaluate the accelerated pattern elimination technique.
  • To assess its performance with three common phosphate-bonded investments.
  • To compare dimensional accuracy with conventional casting techniques.

Main Methods:

  • Determined exothermic setting times for investments using thermocouples.
  • Measured dimensional reproduction of standardized patterns and castings.

Related Experiment Videos

  • Compared accelerated technique (specific setting time + 15 min furnace) with conventional (1-hour bench time + furnace ramp).

    • Main Results:

    • Significant differences in exothermic setting times were observed across investments (P < .01).
    • Accelerated technique resulted in dimensional increases from 0.11% to 4.80%.
    • Conventional technique showed dimensional changes from -0.04% to 3.65%, with significant differences compared to the accelerated method (P < .01).

    Conclusions:

    • Phosphate investments necessitate specific recommended setting times before furnace introduction.
    • Carbon-containing investments exhibited the least dimensional change with both techniques.
    • The accelerated technique significantly impacts casting dimensions, requiring careful consideration of investment material and setting parameters.