The effect of dust-suppressant additives on the physical properties of an irreversible hydrocolloid

Veres, Eniko M.; Slabbert, J.C.G.; Becker, P J

doi:10.1016/0022-3913(90)90274-g

Cited by 3 publications

(6 citation statements)

References 7 publications

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“…Alginate impression materials are used most commonly in making diagnostic casts and working casts because of ease of use, low cost (1) and good patient acceptability (2). Many factors influence on the ultimate success of the prosthesis, such as setting characteristics (2–4), rheological properties after setting (5, 6), and compatibility with dental stones (1, 7–9). These materials are also available for use in combination with an agar hydrocolloid impression material, which is injected onto the preparation (10).…”

Section: Introductionmentioning

confidence: 99%

“…Most of the commercial alginate impression materials are supplied as powders which are mixed with water, whilst some materials are supplied as two pastes which are mixed together (2). Many studies have been reported on some of the properties of powder‐type materials (3, 5, 7–9). However, little information is available on the physical properties during and after setting and compatibility with dental stones, of a paste‐type alginate impression material.…”

Section: Introductionmentioning

confidence: 99%

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Physical properties and compatibility with dental stones of current alginate impression materials

Murata

Kawamura

Hamada

et al. 2004

J of Oral Rehabilitation

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This study examined physical properties and compatibility with dental stones of two types of alginate impression materials. Five powder-type alginate impression materials (Alginoplast EM, Aroma Fine, Algiace Z, Coe Alginate, Jeltrate Plus) and a paste-type alginate impression material (Tokuso AP-1) were used. The dynamic viscosity immediately after mixing was measured by means of a controlled-stress rheometer. The gelation times were determined according to Japanese Industrial Standards (JIS) T6505, and recovery from deformation, strain in compression and compressive strength were determined according to the International Organization for Standardization (ISO) specification 1563. Detail reproduction and surface roughness of type III dental stones (New Plastone, New Sunstone) and a type IV dental stone (Die Stone) were evaluated using a ruled test block as specified in the ISO specification 1563 and a profilometer, respectively. The alginate impression materials evaluated in this study were all in compliance with the ISO specification 1563 and JIS T6505. The alginate impression materials had similar mechanical properties after gelation, whilst a wide range of dynamic viscosity immediately after being mixed, gelation times and compatibility with dental stones were found among the materials. The paste-type material had a higher dynamic viscosity and a shorter gelation time than the powder-type materials. The best surface quality was obtained with the paste-type material/type III dental stone cast combinations. The materials should be selected in consideration of initial flow, setting characteristics and compatibility with dental stones. The results suggested that a paste-type material would better meet the requirements of an alginate impression material.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical properties and compatibility with dental stones of current alginate impression materials

Murata

Kawamura

Hamada

et al. 2004

J of Oral Rehabilitation

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“…A study comparing dental alginates' inorganic fraction and their mechanical and physical properties was not found in the literature. Differences among materials are not directly related to filler content 6,14 , but it seems to be very important to be considered 2,3,9 . The inorganic particles observed by SEM pictures are cell walls of algae from the division Chrysophyta, class Bacillariophycea.…”

Section: Discussionmentioning

confidence: 99%

“…Apparently, these particles would not be an etiologic factor in fibroses of the lungs. Additionally, the manufacturers attempted to produce "dust-free" alginates by incorporating additives (glycols) and suppressing the aerosol formation 6 . The findings of this investigation lead to questions about inorganic filler fraction of dental alginates' correlation to their mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

“…It is recommended to tumble the alginate powder in a closed container before use to establish uniform distribution of the material's ingredients. During this process, airborne particles form an aerosol that could be hazardous to dental professionals, causing pleural and peritoneal malignances 6,7 . Irrespective of composition, certain physical properties of impression materials are required to warrant clinical success.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of filler particle levels and sizes in dental alginates

et al. 2010

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The aim of this study was to determine the inorganic filler fractions and sizes of commercially alginates. The inorganic particles volumetric fractions of five alginates -Jeltrate(J), Jeltrate Plus(JP), Jeltrate Chromatic Ortho(JC), Hydrogum(H) and Ezact Krom(E) were accessed by weighing a previously determined mass of each material in water before and after burning samples at 450 °C for 3 hours. Unsettled materials were soaked in acetone and chloroform and sputter-coated with gold for SEM evaluation of fillers' morphology and size. The results for the volumetric inorganic particle content were (%): J -48.33, JP -48.33, JC -33.79, H -37.55 and E -40.55. The fillers presented a circular appearance with helical form and various perforations. Hydrogum fillers looked like cylindrical, perforated sticks. The mean values for fillers size were (μm): J -12.91, JP -13.67, 8.81 (length). The results of this study revealed differences in filler characteristics that could lead to different results when testing mechanical properties.

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