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Related Experiment Videos

New telescopic crown design for removable partial dentures.

S Minagi1, N Natsuaki, G Nishigawa

  • 1Department of Removable Prosthodontics, Okayama University Dental School, Okayama, Japan. minagi@okayama-u.ac.jp

The Journal of Prosthetic Dentistry
|May 29, 1999
PubMed
Summary
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This study introduces a new telescopic crown system for dentures that simplifies fabrication and allows for adjustable retention. While retention decreases with use, it can be easily readjusted to initial levels, ensuring long-term function.

Area of Science:

  • Dental prosthetics
  • Biomaterials science
  • Removable partial dentures

Background:

  • Fabricating conventional telescopic crowns requires specialized skills for precise frictional retention (conus friction force).
  • Maintaining consistent retentive forces in telescopic crowns after prolonged clinical use presents a significant challenge.

Purpose of the Study:

  • To evaluate an innovative telescopic crown system for removable partial dentures that simplifies fabrication and allows for adjustable retentive forces.
  • To investigate the retention characteristics of these new telescopic crowns after repeated insertion and separation cycles.

Main Methods:

  • Ten telescopic crowns were fabricated and adjusted to an initial retentive force of approximately 9.8 N.
  • Crowns underwent 10,000 insertion/separation cycles, with retentive force measured every 1,000 cycles.

Related Experiment Videos

  • Retentive forces were readjusted to 9.8 N after the initial 10,000 cycles and subjected to a second set of 10,000 cycles.

    • Main Results:

    • Telescopic crown retention gradually decreased with an increasing number of insertion/separation cycles.
    • After 10,000 cycles, the mean retentive force dropped to over 2 N.
    • Following readjustment to 9.8 N, retention again diminished during the subsequent 10,000 cycles.

    Conclusions:

    • The reduction in retention is directly related to the number of insertion/separation cycles.
    • The novel telescopic crown system allows for easy readjustment of reduced retention.
    • Readjusted retentive forces were demonstrated to be equivalent to the initial retention levels.