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Titolo:
Effect of surface treatments on the wettability of vinyl polysiloxane impression materials
Autore:
Kess, RS; Combe, EC; Sparks, BS;
Indirizzi:
Univ Minnesota, Sch Dent, Dept Oral Sci, Minnesota Dent Res Ctr Biomat & Biomech, Minneapolis, MN 55455 USA Univ Minnesota Minneapolis MN USA 55455 iomech, Minneapolis, MN 55455 USA
Titolo Testata:
JOURNAL OF PROSTHETIC DENTISTRY
fascicolo: 1, volume: 84, anno: 2000,
pagine: 98 - 102
SICI:
0022-3913(200007)84:1<98:EOSTOT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Combe, EC Univ Minnesota, Sch Dent, Dept Oral Sci, Minnesota Dent Res Ctr Biomat & Biomech, 16-212 Moos Tower,515 Delaware St SE, Minneapolis, MN 55455 USA Univ Minnesota 16-212 Moos Tower,515 Delaware St SE Minneapolis MN USA 55455
Citazione:
R.S. Kess et al., "Effect of surface treatments on the wettability of vinyl polysiloxane impression materials", J PROS DENT, 84(1), 2000, pp. 98-102

Abstract

Statement of problem. A number of vinyl polysiloxane (VPS) impression materials are claimed to be hydrophilic, but it has been hypothesized that the degree of hydrophilisicty mas be altered by the exposure to saliva, disinfecting agents, and surfactants. Purpose. This study compared the effects of 6 treatment regimes on the hydrophilicity of 3 VPS materials. Material and methods. Three VPS materials (Dimension Garant L, Hydroflex, imprint II, referred to as G, H, and I, respectively) were each treated with: (1) nothing (control), (2) saliva, (3) saliva and NaOCl, (4) saliva and 2-propanol-based disinfectant, (5) saliva, NaOCl and surfactant, and (6) saliva, 2-propanol-based disinfectant, and surfactant. Advancing contact angles (theta(A)) were measured using a Cahn Dynamic contact angle analyzer andWinDCA software. Using saturated CaSO4 solutions, theta(A) was determined for the 3 materials in each of the 6 conditions. For each combination of VPS and treatment, 5 determinations were made using fresh samples and fresh solution each time. Considerable contact angle hysteresis was observed. Two-way ANOVA was performed, followed by post-hoc Boneferroni-Dunn tests. Results. For all outcome variables, the treatment effects were not the same for all materials (P<.001). However, for all materials, treatments that included surfactants were among the groups with the lowest BA values and thus had the best wettability. For example, materials G and I, as made, had high theta(A) values (109.7 and 115.2 degrees, respectively), but these values reduced to approximately 90 degrees after surfactant treatment. Material H had a theta(A) value of 87.1 degrees. Exposure of material H to saliva and/or a disinfectant raised this value, but a theta(A) close to the originalvalue was achieved by the use of a surfactant. Conclusion, Treatments affected the VPS materials in different ways but, after disinfectant treatment, the wetting of "hydrophilic" VPS materials wasimproved bf surfactant treatment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/12/20 alle ore 00:02:48