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Related Experiment Video

Updated: May 3, 2026

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

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Comparison of two impression techniques for auricular prosthesis: pilot study.

Kasim Mohamed1, U M Mani, M K Seenivasan

  • 1Department of Prosthodontics and Implantology, Faculty of Dental Sciences, Room 8, Sri Ramachandra University, Porur, Chennai, Tamilnadu, India, 600116. mohamedkasim9@yahoo.com.

Journal of Rehabilitation Research and Development
|January 25, 2014
PubMed
Summary
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The new triple-layer impression technique (TLIT) provides more accurate ear models for auricular prostheses compared to the conventional impression technique (CIT). TLIT is cost-effective and reduces chairside time for patient rehabilitation.

Area of Science:

  • Prosthodontics
  • Biomaterials
  • Medical Device Technology

Background:

  • Accurate fabrication of auricular prostheses is crucial for patient rehabilitation.
  • Conventional impression techniques may have limitations in capturing intricate ear anatomy.
  • Novel impression methods are needed to improve prosthetic fit and patient outcomes.

Purpose of the Study:

  • To compare the accuracy of the triple-layer impression technique (TLIT) against the conventional impression technique (CIT).
  • To evaluate the efficacy of TLIT in fabricating auricular prostheses.
  • To assess the clinical advantages of TLIT in terms of cost-effectiveness and chairside efficiency.

Main Methods:

  • Fifteen male subjects underwent ear impression using both TLIT and CIT with custom trays and alginate material.
Keywords:
accuracyauricular prosthesisconventional impression techniquedistortionear anthropometryear measurementear orientationsculptingtriple-layer impression techniqueunilateral

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  • Measurements of specific anatomical landmarks were taken on the ear and replicated on gypsum models.
  • Statistical analysis using the sign test was performed to compare measurement accuracy between techniques and actual dimensions.

    • Main Results:

    • Statistically significant differences (p < 0.01) were observed in measurements A-A1, B-B1, and C-C1 between TLIT and CIT when compared to actual ear dimensions.
    • TLIT demonstrated superior accuracy in model fabrication compared to CIT.
    • TLIT proved to be cost-effective, less technique-sensitive, and reduced chairside orientation time.

    Conclusions:

    • The triple-layer impression technique (TLIT) offers enhanced accuracy for auricular prosthesis fabrication compared to conventional methods.
    • TLIT presents a practical, efficient, and cost-effective alternative for clinicians, particularly for patients with unilateral auricular defects.
    • The findings support the adoption of TLIT for improved outcomes in auricular rehabilitation.