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Age changes in the viscoelasticity of a temporary soft lining material
N J Jepson1, J F McCabe, R Storer
1Department of Prosthodontics, Dental School, University of Newcastle upon Tyne, UK.
Journal of Dentistry
|August 1, 1993
Summary
This study monitored the viscoelastic properties of Coe Soft, a temporary soft lining material. Clinically, Coe Soft showed a rapid decrease in compliance over 8 weeks, which was not observed in laboratory tests.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials
Background:
- Temporary soft lining materials are crucial in dentistry for patient comfort and prosthesis stability.
- Understanding the long-term mechanical properties of these materials is essential for clinical efficacy.
- Coe Soft is a commonly used temporary soft lining material whose viscoelastic behavior requires thorough investigation.
Purpose of the Study:
- To evaluate the in vivo and in vitro viscoelastic property changes of a temporary soft lining material (Coe Soft) over time.
- To compare the material's degradation under clinical use versus various immersion conditions.
- To determine the relationship between compliance changes and material thickness over an 8-week period.
Main Methods:
- Viscoelastic properties were assessed using a force-distance probe.
- In vivo monitoring was conducted during 8 weeks of clinical use.
- In vitro studies involved immersion in water, saline, and artificial saliva for up to 96 weeks.
- Material thickness was measured to correlate with compliance changes.
Main Results:
- A significant, time-dependent reduction in compliance was observed for Coe Soft during 8 weeks of clinical use, with rapid changes in the first week.
- In vitro immersion in water, saline, and artificial saliva also led to significant compliance reductions within the first week.
- Prolonged in vitro immersion showed further compliance reduction only in artificial saliva (8 weeks) and distilled water (96 weeks).
- No significant changes in lining thickness were found in vivo, despite compliance reductions.
Conclusions:
- Coe Soft exhibits significant viscoelastic property changes, particularly a decrease in compliance, during clinical use.
- The in vivo degradation of compliance is more pronounced than that observed under various in vitro conditions.
- Material thickness does not appear to be the primary factor influencing the observed compliance changes in clinical settings.