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[Consistency of zinc oxide-eugenol impression materials]
W L Gomes1, J F Santos, A Muench
1Faculdade de Odontología, Universidade de São Paulo.
Revista De Odontologia Da Universidade De Sao Paulo
|July 1, 1990
Summary
Three zinc oxide-eugenol impression pastes were evaluated for flow and setting time. Two pastes are suitable for non-compressive techniques, while one is better for compressive techniques due to faster setting.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
Background:
- Zinc oxide-eugenol pastes are commonly used in dentistry for impressions.
- Understanding their rheological properties is crucial for optimal clinical application.
Purpose of the Study:
- To investigate the consistency and flow characteristics of three zinc oxide-eugenol impression pastes.
- To determine the suitability of these materials for different impression techniques based on their performance.
Main Methods:
- Flow tests were conducted according to AMERICAN DENTAL ASSOCIATION (ADA) Specification No. 16.
- Setting time was determined by measuring the load application point for a standard disc diameter, with graphical data acquisition.
Main Results:
- Two zinc oxide-eugenol pastes (Equalizing and Horus) exhibited high initial flow, with the latter showing a quicker decrease.
- The third paste (Lysanda) demonstrated lower flow and a faster setting time.
- The Horus paste had a shorter working time compared to Equalizing.
Conclusions:
- Equalizing and Horus pastes are suitable for non-compressive impression techniques, though Horus has a reduced working time.
- Lysanda paste, with its lower flow and faster setting, is indicated for compressive impression techniques.