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Related Experiment Videos

Issues in handling impression materials.

R Giordano

    General Dentistry
    |May 15, 2002
    PubMed
    Summary
    This summary is machine-generated.

    Dental implant impressions demand high accuracy. Medium viscosity polyether and high viscosity addition silicone impression materials minimize distortion, ensuring precise master casts for better-fitting restorations.

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    Area of Science:

    • Dental Materials Science
    • Prosthodontics
    • Biomaterials Engineering

    Background:

    • Dental implant restorations require exceptional accuracy due to the rigid fixation of implants, unlike natural teeth with periodontal ligaments.
    • Inaccuracies in impression copings and master casts can lead to significant fit issues in implant-supported prostheses.
    • Traditional impression techniques face challenges with coping rotation and interabutment positional distortion.

    Purpose of the Study:

    • To evaluate the torque required to displace impression copings.
    • To assess the positional accuracy of various dental impression materials.
    • To identify optimal impression materials for accurate dental implant restorations.

    Main Methods:

    • Investigated the torque necessary to displace impression copings across eight material groups.

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  • Assessed the positional accuracy of impression materials on master casts.
  • Compared medium viscosity polyether, high viscosity addition silicone, and medium viscosity polysulfide materials.

    • Main Results:

    • Torque analysis eliminated certain materials, identifying medium viscosity polyether, high viscosity addition silicone, and medium viscosity polysulfide as potentially suitable.
    • Polyether and addition silicone impression materials demonstrated minimal distortion, producing the most accurate master casts.
    • Manufacturer's recommendations regarding catalyst-to-base ratios, working/setting times, and stone compatibility are crucial.

    Conclusions:

    • Medium viscosity polyether and high viscosity addition silicone are recommended for dental implant impressions due to their low distortion.
    • Adhering to manufacturer guidelines and employing best practices like rigid trays and prompt pouring minimizes fabrication errors.
    • Early error elimination in the impression process is critical for achieving well-fitting implant restorations and reducing final adjustments.