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Updated: Feb 22, 2026

Measuring the Complete-arch Distortion of an Optical Dental Impression
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[Three-dimensional accuracy of plaster casts obtained using three impression materials].

Li Sun1, Hong-bo Li, Bing-feng Chu

  • 1Department of Stomatology, General Hospital of PLA, Beijing 100853, China. sunli112@sina.com

Nan Fang Yi Ke Da Xue Xue Bao = Journal of Southern Medical University
|February 18, 2010
PubMed
Summary
This summary is machine-generated.

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Impregum-Penta polyether rubber and silicone materials offer accurate dental arch reproductions, unlike alginate impression materials. These findings are crucial for precise dental modeling and error analysis in the cervix and gingival regions.

Area of Science:

  • Dental materials science
  • Biomedical engineering
  • 3D imaging technology

Background:

  • Accurate dental impressions are critical for fabricating prosthetics and restorations.
  • Evaluating the dimensional stability of various impression materials is essential for clinical success.
  • Simian dental arches provide a standardized model for material testing.

Purpose of the Study:

  • To assess the accuracy of three dental impression materials (alginate, C-silicone, Impregum-Penta polyether rubber) in replicating simian dental arches.
  • To quantify discrepancies in cast volumes produced by each material using a 3D optical digitizer.
  • To identify areas of maximal deviation in the replicated dental models.

Main Methods:

  • Two simian dental arches served as master models.

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  • Impressions were taken using alginate, C-silicone, and Impregum-Penta polyether rubber.
  • Five stone casts were created for each material and master model.
  • Master models and casts were digitized using a 3D optical scanner.
  • Superimposition of digital models allowed for volume comparison and discrepancy analysis.

    • Main Results:

    • Plaster cast volumes showed discrepancies of -5.84% (alginate), -3.21% (silicone), and -0.63% (Impregum-Penta) compared to master models.
    • Alginate material exhibited statistically significant volume reduction (P<0.05).
    • Silicone and Impregum-Penta polyether rubber showed no significant discrepancies.
    • Maximal deviations were consistently observed in the cervical and gingival areas.

    Conclusions:

    • All tested impression materials resulted in smaller cast volumes than the master models.
    • Impregum-Penta polyether rubber provided the most accurate dental model reproduction, followed by silicone materials.
    • Alginate impression materials were found to be inaccurate for precise dental arch replication.
    • The cervical and gingival regions are critical areas prone to errors in impression materials.