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Tooth structure loss apical to preparations for fixed partial dentures when using self-limiting burs

M H Ramp1, M S McCracken, R B Mazer

  • 1Department of Restorative Dentistry, School of Dentistry, University of Alabama at Birmingham 35294-0007, USA.

The Journal of Prosthetic Dentistry
|May 23, 1998
PubMed
Summary

Guide pins in dental preparation burs can cause significant tooth structure loss apical to the finish line. Cylindrical guide pins resulted in the most abrasion, highlighting potential risks in fixed partial denture preparation.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials

Background:

  • Guide pins are utilized in dental burs to control preparation depth for fixed partial dentures.
  • The impact of guide pins on tooth structure apical to the finish line remains under-documented.

Purpose of the Study:

  • To evaluate tooth structure loss within 1.0 mm apical to the finish line.
  • To compare preparation outcomes using straight cylinder and tapered cylinder self-limiting burs versus a conventional bur.

Main Methods:

  • An in vitro study involving 45 extracted human teeth randomly assigned to three groups.
  • Teeth were prepared using two types of diamond burs with guide pins and a conventional diamond bur (control).
  • Surface profiling before and after preparation, followed by statistical analysis (ANOVA, Tukey-Kramer HSD test).

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Main Results:

  • All preparation groups showed abrasion apical to the finish line.
  • The cylindrical guide pin group exhibited the most significant tooth structure loss.
  • No significant difference was found between the control and tapered cylinder self-limiting pin groups.

Conclusions:

  • Self-limiting burs with guide pins can lead to undesirable tooth structure loss.
  • Cylindrical guide pins pose a higher risk of abrasion compared to tapered designs and conventional burs.
  • Careful selection of burs is crucial to minimize iatrogenic damage during fixed partial denture preparation.