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Pins for direct restorations

J Papa1, P R Wilson, M J Tyas

  • 1School of Dental Science, University of Melbourne, Australia.

Journal of Dentistry
|October 1, 1993
PubMed
Summary
This summary is machine-generated.

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Self-threading dentine pins aid complex restorations but risk tooth damage. Minimizing strain involves slight unscrewing, tap threads, and smaller pin sizes, while perforations depend on operator awareness.

Area of Science:

  • Dental materials science
  • Restorative dentistry

Background:

  • Self-threading dentine pins are crucial for retaining large, complex direct restorations.
  • However, their placement is associated with significant clinical challenges.

Purpose of the Study:

  • To identify and analyze common problems associated with self-threading dentine pin placement.
  • To explore methods for minimizing dentine strain, crazing, and perforations.

Main Methods:

  • Review of clinical complications and material properties related to dentine pin insertion.
  • Analysis of factors influencing pin channel shape and seating, including twist drill characteristics.
  • Evaluation of pin and twist drill standardization issues and manufacturer attempts at depth control.

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Main Results:

  • Dentine strain and crazing are common post-insertion issues.
  • Pulpal and lateral perforations are risks, preventable with operator awareness of tooth anatomy.
  • Minimizing strain can be achieved by slightly unscrewing the pin, using tap threads, and selecting the smallest possible pin.
  • Twist drill condition and form impact pin channel shape and seating.
  • Lack of standardization in pin and drill dimensions contributes to poor retention.

Conclusions:

  • Operator awareness and specific techniques can mitigate risks like perforations and strain.
  • Improved standardization and quality control in pin and drill manufacturing are essential for reliable performance.
  • Further research is needed to refine methods for limiting pin penetration depth.