title: Investigation of preferred viscosity of irreversible hydrocolloid on preliminary impression for edentulism.
abstract: 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 (eta 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 x 10(3) Pa x s.
authors.affiliation: Department of Occlusal and Oral Functional Rehabilitation, Okayama University Graduate School of Medicine and Dentistry, 2-5-1, Shikata-cho, Okayama 700-8525, Japan. ykmar@md.okayama-u.ac.jp
authors.forename: Yukinori
authors.initials: Y
authors.lastname: Maruo
authors.forename: Masao
authors.initials: M
authors.lastname: Irie
authors.forename: Goro
authors.initials: G
authors.lastname: Nishigawa
authors.forename: Morihiko
authors.initials: M
authors.lastname: Oka
authors.forename: Shogo
authors.initials: S
authors.lastname: Minagi
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Suzuki
mesh_terms: D000464:Alginates / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003760:Dental Impression Materials / Q000737:chemistry*; D007575:Jaw, Edentulous / Q000534:rehabilitation; D003765:Models, Dental; D014783:Viscosity
chemical_list: D000464:Alginates; D003760:Dental Impression Materials