This study aims to investigate the preferred viscosity of irreversible hydrocolloid used in the preliminary impression for edentulism. Thirteen modalities of irreversible hydrocolloid were prepared by changing the W/P ratio. Discrimination test for the preferred viscosity was performed on 11 prosthodontists (10.4±5.3 years of prosthetic experience). The parameter of discrimination test (P%) was calculated as the ratio of the number of adequate tests to the total number of tests. The P% and apparent viscosity coefficient (η a) values measured by rheometer demonstrated good correlation (Y=-35.8X2 + 118.4X-22.8, r=0.86, p<0.01). Prosthodontists could judge the preferred viscosity based on their clinical experiences. On the preliminary impression for edentulism, the preferred viscosity demonstrated in vitro using a polyurethane maxilla model was 1.21×103 Pa·s.
|Number of pages||4|
|Journal||Dental materials journal|
|Publication status||Published - Sept 2004|
- Irreversible hydrocolloid
- Preliminary impression
ASJC Scopus subject areas
- Ceramics and Composites