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Related Experiment Videos

Relationship between proximal cavity design and recurrent caries.

P F Otto1, J T Rule

  • 1Department of Pediatric Dentistry, Baltimore College of Dental Surgery, University of Maryland.

Journal of the American Dental Association (1939)
|June 1, 1988
PubMed
Summary

For Class II restorations, ensuring the gingival margin is clear of the adjacent tooth's contact area is crucial. Margins occlusal to this contact significantly increase the risk of recurrent decay over two years.

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Area of Science:

  • Restorative Dentistry
  • Dental Materials
  • Caries Research

Background:

  • Class II restorations are common dental procedures.
  • Gingival margin placement is a critical factor in restoration longevity.
  • Recurrent caries at the gingival margin remains a clinical challenge.

Purpose of the Study:

  • To investigate the relationship between the occlusal-gingival length of Class II restorations and the incidence of recurrent caries.
  • To determine if the position of the gingival margin relative to the adjacent tooth contact area impacts caries development.

Main Methods:

  • A total of 375 Class II restorations were analyzed.
  • Restorations were categorized into short, intermediate, and long groups based on occlusal-gingival length and radiographic assessment of the contact area.

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  • Recurrent caries at the gingival margin was monitored over a 2-year period.

    • Main Results:

    • Restorations with gingival margins positioned occlusal to the adjacent tooth contact area exhibited a significantly higher rate of recurrent caries.
    • This increased caries rate was observed at all measured time intervals during the 2-year study.
    • The occlusal-gingival length of the restoration was less critical than ensuring the gingival margin cleared the contact area.

    Conclusions:

    • Clearing the adjacent tooth contact area with the gingival margin of Class II restorations is paramount for preventing recurrent caries.
    • The absolute length of the restoration is secondary to proper margin placement relative to the contact zone.
    • Clinical guidelines should emphasize achieving a caries-resistant gingival margin by avoiding sub-contact placement.