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Accuracy of two impression techniques with angulated implants.

Heather J Conrad1, Igor J Pesun, Ralph DeLong

  • 1Division of Prosthodontics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minn. 55455, USA. conr0094@umn.edu <conr0094@umn.edu>

The Journal of Prosthetic Dentistry
|July 10, 2007
PubMed
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This summary is machine-generated.

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Impression technique, implant angulation, and number do not significantly affect the accuracy of definitive dental casts. All tested combinations showed similar distortion magnitudes for implant restorations.

Area of Science:

  • Dental materials science
  • Prosthodontics
  • Biomaterials engineering

Background:

  • Accurate recording of dental implant positions is crucial for successful prosthetic restorations.
  • Angulated implants and impression techniques can compromise the accuracy of definitive casts.

Purpose of the Study:

  • To evaluate the combined effect of impression technique, implant angulation, and implant number on the accuracy of definitive dental casts.

Main Methods:

  • Fabricated definitive casts with 3 implants in a triangular pattern, varying angulations (0-15 degrees).
  • Created duplicate casts using open and closed tray impression techniques with addition silicone.
  • Measured implant angles using coordinate data and vector calculations; analyzed with repeated-measures ANOVA.

Related Experiment Videos

Main Results:

  • No significant difference in angle errors between open and closed tray impression techniques (P=.22).
  • Implant angulation and number influenced average angle errors, but without a clear pattern (P<.001).
  • The interaction of impression technique, angulation, and number did not affect duplicate cast accuracy (P=.19).

Conclusions:

  • Both open and closed tray impression techniques yield comparable accuracy for definitive dental casts.
  • No predictable pattern of angle errors was observed concerning implant angulation and number.
  • The degree of distortion was consistent across all tested combinations of impression technique, implant angulation, and number.