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Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study
Manisha M Kulkarni1, Ram U Thombare2
1Reader, Department of Prosthodontics, Yashwant Rao Chauhan Dental College , Ahmednagar, Maharashtra, India .
Journal of Clinical and Diagnostic Research : JCDR
|October 6, 2015
Summary
Immediate pouring of alginate impressions minimizes distortion, with Marieflex showing superior accuracy. Maintaining optimal temperature and humidity during storage is crucial for dimensional stability in dental prosthetics.
Area of Science:
- Dental Materials Science
- Prosthodontics
Background:
- Dentists require dimensionally stable impression materials for accurate prosthesis fabrication.
- A wide array of dental materials presents selection challenges.
Purpose of the Study:
- To evaluate the impact of pour time and temperature on the dimensional stability of three commercial alginate brands.
- To determine optimal conditions for preserving alginate impression accuracy.
Main Methods:
- Three alginate brands (Velplast, Marieflex, Zelgan) were tested.
- Dimensional accuracy was assessed by measuring master casts.
- Impressions were made with variations in pour time (immediate, 20, 40 minutes) and temperature (25°C, 30°C, 40°C).
Main Results:
- Least distortion occurred at 20 minutes post-pour across varying temperatures.
- Impressions stored at 30°C for 20 minutes exhibited higher accuracy than those stored at 40°C.
- All stored impressions demonstrated some degree of shrinkage.
Conclusions:
- Marieflex demonstrated superior dimensional accuracy compared to Velplast and Zelgan.
- Immediate pouring of alginate impressions is recommended to minimize distortion.
- Controlling temperature, humidity, water-powder ratio, and mixing water temperature is vital for maintaining impression accuracy.
