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Related Experiment Videos

Dimensional changes of ring-shaped pattern.

Masahiro Ohsawa1, Masahiro Kawaguchi, Yoshihiko Hayashi

  • 1Nagasaki University, Graduate School of Biomedical Science, Department of Developmental and Reconstructive Medicine, Division of Cariology, Sakamoto, Nagasaki-city, Nagasaki, Japan. ohsawa@net.nagasaki-u.ac.jp

Dental Materials Journal
|August 4, 2004
PubMed
Summary

Dental casting dimensional accuracy is affected by wax pattern inside diameter. Smaller inside diameters showed greater dimensional changes during investment setting and casting, impacting final gold alloy restorations.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Technology

Background:

  • Accurate reproduction of dental wax patterns is crucial for successful casting procedures.
  • Gypsum-bonded investments are commonly used in dental casting, but their setting expansion can influence dimensional accuracy.
  • The geometry of wax patterns, particularly the internal dimensions, may affect the dimensional stability of the investment mold.

Purpose of the Study:

  • To evaluate the influence of different inside diameters of ring-shaped wax patterns on dimensional changes during investment and casting.
  • To compare the dimensional accuracy of fusible alloy and gold alloy castings with their respective wax patterns.
  • To understand how internal dimensions affect setting expansion and final casting dimensions in dental precise casting.

Main Methods:

Related Experiment Videos

  • Ring-shaped wax patterns with identical outside diameters but varying inside diameters were invested using gypsum-bonded cristobalite investment.
  • Wax patterns were eliminated in an electric furnace, and fusible alloy castings were made at room temperature.
  • Gold alloy castings were fabricated using standard dental precise casting procedures.
  • Dimensional deviations were measured using inside diameter, ring width, and outside diameter, comparing castings to wax patterns.

Main Results:

  • Dimensional changes during setting expansion varied between wax patterns with small and large inside diameters.
  • The small inside diameter specimen exhibited significant dimensional changes at three measured portions, unlike the large inside diameter specimen.
  • Gold alloy castings showed comparable dimensions at the ring width and inside diameter, but differences were observed at the outside diameter.

Conclusions:

  • The inside diameter of wax patterns significantly influences dimensional changes during investment setting expansion.
  • Internal dimensions of wax patterns affect the dimensional accuracy of the final gold alloy casting.
  • Understanding these geometric influences is vital for optimizing dental casting procedures and achieving precise restorations.