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Related Experiment Videos

Comparative accuracy of implant impression procedures.

D Assif1, A Fenton, G Zarb

  • 1Faculty of Dentistry, University of Toronto.

The International Journal of Periodontics & Restorative Dentistry
|January 1, 1992
PubMed
Summary

Splinting transfer copings with acrylic resin in dental impressions significantly improves stone cast accuracy. This method yielded more accurate casts than other tested procedures, enhancing implant restoration precision.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Accurate dental impressions are crucial for fabricating well-fitting implant-supported prostheses.
  • Previous studies highlight variability in impression techniques affecting cast accuracy.
  • Transfer coping management during impression procedures is a key factor in precision.

Purpose of the Study:

  • To evaluate and compare the accuracy of four different impression procedures for implant dentistry.
  • To determine the influence of splinting techniques and coping design on cast accuracy.
  • To provide evidence-based recommendations for optimal impression protocols in clinical practice.

Main Methods:

  • A laboratory model simulating clinical conditions was used to assess impression accuracy.

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  • Stone casts with brass implant analogs were fabricated and measured against a standard framework.
  • Accuracy was evaluated through manual, visual, and microscopic analysis of framework fit on casts.

    • Main Results:

    • Splinting transfer copings with acrylic resin resulted in all acceptable casts, outperforming other methods.
    • Impressions with undercuts retained in the material showed better accuracy when using impression material for orientation.
    • Removing and re-seating smooth transfer copings in the impression led to unacceptable cast accuracy in most cases.

    Conclusions:

    • Acrylic resin splinting of transfer copings is a superior method for achieving accurate stone casts in implant dentistry.
    • Proper management of transfer copings, particularly avoiding removal and re-seating of smooth copings, is vital for impression accuracy.
    • The findings support the use of specific impression techniques to enhance the predictability and success of implant prosthodontic restorations.