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Related Experiment Video

Updated: Jul 14, 2026

Effects of Mechanical Methods Used in Peri-implantitis Treatment on Implant Surface Decontamination and Roughness
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Comparative analysis of 4 impression techniques for implants.

Leonardo Moreira Cabral1, Carlos Gramani Guedes

  • 1Faculdade de Ciências da Saúde, Departamento de Odontologia, Universidade de Brasília, Distrito Federal, Brazil.

Implant Dentistry
|June 15, 2007
PubMed
Summary

The direct impression technique using sectioned and welded acrylic resin splints demonstrated superior dimensional accuracy compared to other methods. This finding is crucial for precise dental implant restorations.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials

Background:

  • Accurate impressions are critical for fabricating well-fitting dental prostheses, especially for implant-supported restorations.
  • Various impression techniques exist, each with potential impacts on the final fit and accuracy of the restoration.
  • Evaluating the dimensional stability of these techniques is essential for clinical success.

Purpose of the Study:

  • To compare the dimensional accuracy of four different impression techniques for implant-supported restorations.
  • To identify the most accurate impression technique among those evaluated in an in vitro setting.

Main Methods:

  • A master metal framework with two implants served as the standard for comparison.
  • Sixty master casts were used to evaluate four impression techniques: indirect, direct unsplinted, direct splinted with acrylic resin, and direct splinted with sectioned and welded acrylic resin.

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  • Dimensional accuracy was measured using a profile projector to determine the distance between transfer copings.

    • Main Results:

    • The direct impression technique utilizing squared transfer copings with acrylic resin splints, which were sectioned and welded after setting, showed no significant difference in dimensional accuracy compared to the master metal framework.
    • This specific technique yielded results comparable to the gold standard.

    Conclusions:

    • The direct impression technique with sectioned and welded acrylic resin splints offers superior dimensional accuracy among the evaluated methods.
    • This technique is recommended for achieving precise impressions in implant dentistry.