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Working time of polymeric restorative materials.
Journal of Dental Research
|March 1, 1976
Summary
Rheologic methods can determine polymeric restorative material working times. Early viscosity changes significantly impact material mobility and adaptation during setting reactions.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Rheology
Background:
- Accurate determination of working times for dental restorative materials is crucial for clinical success.
- Understanding the setting reaction kinetics of polymers is essential for material performance.
Purpose of the Study:
- To investigate the validity of using rheologic methods to determine the working times of polymeric restorative materials.
- To assess the impact of setting reactions on material adaptation and mobility.
Main Methods:
- Polymeric restorative materials were subjected to rheologic analysis in a laboratory setting.
- Material adaptation to artificial cavities was measured at 30-second intervals during setting.
Main Results:
- Significant deterioration in material adaptation was observed during the working times.
- Early changes in viscosity during setting reactions were found to drastically affect material mobility.
Conclusions:
- Rheologic methods are a valid approach for determining the working times of polymeric restorative materials.
- Precise control over material handling is necessary due to the sensitivity of adaptation to early viscosity changes.