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Dimensional stability and weight changes of tissue conditioners.

H Murata1, M Kawamura, T Hamada

  • 1Department of Prosthetic Dentistry, Hiroshima University Faculty of Dentistry, Hiroshima, Japan. hmurata@hiroshima-u.ac.jp

Journal of Oral Rehabilitation
|December 12, 2001
PubMed
Summary

Tissue conditioners are crucial for accurate oral impressions. Most conditioners shrink and lose weight over time, except SR-Ivoseal which expands. Optimal impression time is 24 hours.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Tissue conditioners are vital for creating functional impressions of oral mucosa.
  • Dimensional stability is a key characteristic influencing the accuracy of these impressions.

Purpose of the Study:

  • To evaluate the linear dimensional changes and weight changes of six tissue conditioners over time.
  • To determine the relationship between dimensional changes, weight changes, water absorption, and solubility.
  • To identify the optimal time for obtaining functional impressions.

Main Methods:

  • Six tissue conditioners were tested: COE Comfort, FITT, GC Soft-Liner, Hydro-Cast, SR-Ivoseal, and Visco-Gel.
  • Linear dimensional changes and weight changes were measured using a travelling microscope at various time points up to 21 days.

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  • Water absorption and solubility were determined for each material.

    • Main Results:

    • Most materials (except SR-Ivoseal) exhibited shrinkage and weight loss in water, indicating higher solubility than absorption.
    • SR-Ivoseal showed expansion and weight gain.
    • A strong positive linear relationship (r=0.797–0.986, P < 0.05) was observed between dimensional and weight changes.
    • Dimensional stability varied significantly among the tested materials.

    Conclusions:

    • Water absorption and solubility significantly influence the dimensional stability of tissue conditioners.
    • The optimal period for achieving functional impressions with these materials is suggested to be 24 hours post-insertion.
    • Selection of appropriate tissue conditioners is critical due to observed variations in dimensional stability.