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Related Experiment Videos

Runner bar modification for mandibular removable partial dentures.

D M Bohnenkamp1

  • 1Yokota Air Force Base, Japan.

The Journal of Prosthetic Dentistry
|January 1, 1989
PubMed
Summary

Acrylic resin denture base fractures in removable partial dentures can be prevented with a runner bar modification. This technique improves retention and rigidity, especially for mandibular anterior restorations, without affecting aesthetics or function.

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Area of Science:

  • Dental prosthetics
  • Materials science in dentistry
  • Removable partial dentures

Background:

  • Acrylic resin denture bases in mandibular removable prostheses are prone to fracture due to insufficient retention and support.
  • Restoring excessive crown length in the mandibular anterior region can exacerbate these issues.

Purpose of the Study:

  • To present a technique for enhancing the retention and rigidity of mandibular removable partial denture bases.
  • To address the problem of segment breakage in acrylic resin denture bases, particularly in the anterior region.

Main Methods:

  • A 14-gauge (1.7 mm) round wax runner bar was conformed to the anterior arch form during the removable partial denture wax-up.
  • Vertical wax struts were incorporated to connect the denture base retention elements to the runner bar.

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Main Results:

  • The runner bar modification technique was described for improving denture base stability.
  • The procedure aims to enhance retention and rigidity of the prosthesis.

Conclusions:

  • The runner bar modification offers a viable solution for preventing acrylic resin denture base fractures.
  • This technique improves prosthesis retention and rigidity without compromising esthetics and function, particularly in cases with extensive anterior restorations.