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Related Experiment Videos

The mandibular incisor: rethinking guidelines for post and core design

A H Gluskin1, R A Radke, S L Frost

  • 1Department of Endodontics, University of the Pacific School of Dentistry, San Francisco, CA 94115, USA.

Journal of Endodontics
|January 1, 1995
PubMed
Summary

Morphological dowels offer superior retention and reduced fracture risk in narrow lower incisors compared to standardized designs. Restoring endodontically treated teeth with intact crowns provides maximum fracture resistance.

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Area of Science:

  • Dental materials science
  • Restorative dentistry
  • Endodontics

Background:

  • Limited research exists on restoring endodontically treated teeth with minimal coronal and root dimensions.
  • Post and core restorations are crucial for restoring function and aesthetics in endodontically treated teeth.

Purpose of the Study:

  • To evaluate the retention and fracture resistance of mandibular incisors restored with different dowel designs.
  • To compare prefabricated round dowels with custom-molded morphological dowels.

Main Methods:

  • Fifty endodontically treated mandibular incisors were divided into four groups for dowel and core restoration.
  • One control group featured intact natural crowns restored with composite resin.
  • Tensile and transverse loads were applied using a universal testing machine to assess retention and fracture resistance.

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Main Results:

  • No significant difference in transverse load resistance was observed between morphological and standardized dowels.
  • Morphological dowels demonstrated significantly higher retention than standardized round dowels in narrow incisors (p=0.007).
  • Ferruled morphological post and core designs reduced the likelihood of catastrophic root or post fracture.

Conclusions:

  • Morphological dowels provide superior retention and potentially better fracture outcomes in narrow endodontically treated teeth.
  • Intact natural crowns remain the most effective means of preventing root fracture in endodontically treated teeth.