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Accuracy of different impression techniques for internal-connection implants.

Yun-Jung Lee1, Seong-Joo Heo, Jai-Young Koak

  • 1Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea.

The International Journal of Oral & Maxillofacial Implants
|October 30, 2009
PubMed
Summary

Nonoctagonal pickup impression techniques provide more accurate casts for angulated conical internal-connection implants compared to transfer techniques. Splinting and coping shape did not significantly affect accuracy in pickup or transfer methods, respectively.

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Area of Science:

  • Dental prosthodontics
  • Implant dentistry
  • Materials science

Background:

  • Accurate impressions are crucial for fabricating well-fitting implant prostheses.
  • Angulated implants present unique challenges for impression accuracy.

Purpose of the Study:

  • To evaluate and compare the accuracy of four implant-level impression techniques for angulated conical internal-connection implants.
  • To determine the influence of splinting and coping design on impression accuracy.

Main Methods:

  • Four impression techniques were tested: octagonal/nonoctagonal transfer copings and nonoctagonal pickup copings (splinted/unsplinted).
  • Polyether impressions were made from master casts with angulated implant analogs.
  • Marginal gap measurements were taken using optical microscopy after framework seating.

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Main Results:

  • Nonoctagonal pickup impression techniques yielded significantly more accurate casts than transfer techniques (P < .05).
  • No significant difference in accuracy was found between splinted and unsplinted pickup techniques (P > .05).
  • No significant difference was found between octagonal and nonoctagonal transfer copings (P > .05).

Conclusions:

  • Nonoctagonal pickup impression techniques are superior for achieving accurate casts with angulated conical internal-connection implants.
  • The choice between splinted or unsplinted pickup techniques does not impact accuracy.
  • Coping shape (octagonal vs. nonoctagonal) does not influence the accuracy of transfer impression techniques.