The effects of a liquid dispersing agent and a microcrystalline additive on the physical properties of type IV gypsum

Zakaria, Ma'an Rasheed; Johnston, William M.; Reisbick, M.H.; Campagni, Wayne V.

doi:10.1016/0022-3913(88)90227-2

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…Based on these trials, additions of lignosulphonates, 1% potassium sulfate, calcium hydrogen phosphate, a liquid dispersing agent, and microcrystalline additives have been recommended. [17][18][19][20] In addition, the studies of Sanad et al 21 and Alsadi et al 22 showed that a mixture of gum arabic and calcium hydroxide reduces the amount of water necessary to mix gypsum products, resulting in improved strength properties.…”

mentioning

confidence: 99%

The effect of disinfectants on the properties of dental gypsum: 1. Mechanical properties

Abdelaziz¹,

Combe²,

Hodges³

2002

Journal of Prosthodontics Implant, Esthetic and Reconstructive Dentistry

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confidence: 99%

The effect of disinfectants on the properties of dental gypsum: 1. Mechanical properties

Abdelaziz¹,

Combe²,

Hodges³

2002

Journal of Prosthodontics Implant, Esthetic and Reconstructive Dentistry

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“…While For plaster tab water increases its water requirement ; this difference may be due to the difference in physical properties of dental stone and plaster or to the addition of chemical materials during manufacturing , that makes distilled water more easily dispense between gypsum particles and there by decrease their water requirement. (10,27) In this study an increase in the water powder ratio was noted Table (3) when mixed with de-ionized water. This can be explained by the fact that there are no ions in this type of water Table (1) so that it's more difficult for de-ionized water to dispense between gypsum particles and thereby increasing their water powder ratio.…”

Section: Discussionmentioning

confidence: 54%

“…(1)(2)(3) Water powder ratio is an important factor in the quality of gypsum materials, (4,5) many experimental attempts to improve mechanical properties of dental stone are oriented mainly towards the decrease of gauging water requirement. (6)(7)(8)(9)(10)(11) Accurate compassion of gypsum properties should be undertaken while all materials are mixed to the same consistency. (12) The principal difference among gypsum products is in the physical shape and nature of the calcium sulfate crystals makes it possible to obtain the same consistency with less excess water with dental stone and high stone than with model plaster.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Water Types on The Water Powder Ratio of Dental Gypsum Products

Taqa¹,

Mohammed²,

Alomari³

2012

RDENTJ

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‫األهداف‬ : ‫ل‬ ‫األسٌبى‬ ‫حجز‬ ‫لوبدة‬ ‫الوسحىق‬ ‫إلى‬ ‫الوبء‬ ‫ًسبت‬ ‫على‬ ‫الوٍبٍ‬ ‫هي‬ ‫هخخلفت‬ ‫أًىاع‬ ‫حأثٍز‬ ‫حمٍٍن‬ . ‫وطر‬ ‫المواد‬ ‫ائ‬ ‫العمل‬ ‫ق‬ : ‫الذراست‬ ‫هذٍ‬ ‫فً‬ ‫خوس‬ ‫اسخخذام‬ ‫حن‬ ‫ة‬ ‫الوٍبٍ‬ ‫هي‬ ‫هخخلفت‬ ‫أًىاع‬ ( ‫البئز‬ ‫هبء‬ ‫و‬ ‫غٍزاالٌىًً‬ ‫الوبء‬ ‫الحٌفٍت،‬ ‫،هبء‬ ‫المىام‬ ‫رلٍك‬ ‫هالط‬ ، ‫الومطز‬ ‫الوبء‬ ) ‫هزجهب‬ ‫حن‬ ‫الخً‬ ‫األسٌبى‬ ‫حجز‬ ‫هبدة‬ ‫هي‬ ‫ًىعٍي‬ ‫هع‬ (plaster and stone) . ‫النتائج‬ : ‫الوسحىق‬ ‫إلى‬ ‫الوبء‬ ‫ًسبت‬ ‫فً‬ ‫هعٌىي‬ ‫اخخالف‬ ‫وجىد‬ ‫الٌخبئج‬ ‫أظهزث‬ ‫الذراست‬ ‫فً‬ ‫الوسخخذهت‬ ‫الوٍبٍ‬ ‫هي‬ ‫الوخخلفت‬ ‫األًىاع‬ ‫هع‬ ‫هزجهب‬ ‫عٌذ‬ ‫األسٌبى‬ ‫حجز‬ ‫لوبدة‬ . ‫االستنتاجات‬ : ‫الخً‬ ‫الوبء‬ ‫كوٍت‬ ‫إى‬ ‫الٌخبئج‬ ‫بٌٍج‬ ‫الوزج‬ ‫فً‬ ‫الوسخخذم‬ ‫الوبء‬ ‫ًىع‬ ‫حسب‬ ‫حخخلف‬ ‫الجبس‬ ‫هبدة‬ ‫هشخمبث‬ ‫ححخبجهب‬ . ‫الجبس‬ ‫هشخمبث‬ ‫إلٍهب‬ ‫ححخبج‬ ‫هبء‬ ‫ًسبت‬ ‫الل‬ ‫الٌخبئج‬ ‫أظهزث‬ ‫كوب‬ ‫المىام‬ ‫رلٍك‬ ‫الوالط‬ ‫اسخخذام‬ ‫عٌذ‬ ‫هً‬ .ABSTRACT Aims: To evaluate the effect of different water types on the water powder ratio of dental gypsum products. Materials and Methods: In this study five types of water (distilled, tab, slurry, de-ionized and well water) were used to be mixed with two types of dental gypsum products (plaster and stone). Results: Results showed a statistically significant difference at p ≤ 0.05 in water powder ratio of gypsum products when mixed with different types of water that used in this study . Conclusions: Water requirement of gypsum product varies in respect to the type of water used to be mixed with. The most pronounce decrease in water requirement of dental gypsum products was achieved with slurry water. Key words: types of water, water powder ratio and gypsum product.Taqa AA. Mohammed NZ. Alomari AW. The Effect of Different Water Types on The Water Powder

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“…Type V gypsum has high setting expansion, therefore, it is indicated for material models that have high solidification contraction, such as basic metals, in order to offset this contraction 4 . Some studies [5][6][7][8] evaluated if the addition of certain substances to gypsum (calcium sulfate hemihydrate powder) or in water could change the setting expansion, surface hardness, setting time and compressive strength of gypsum specimens. Brukl et al 9 (1984) evaluated the effect of using different types of water in setting time and setting expansion of gypsum.…”

mentioning

confidence: 99%

Influence of different water types on the physical and mechanical properties of gypsum

Proença¹,

Suzuki²,

Costa³

et al. 2015

Braz. J. Oral Sci.

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Aim: To evaluate if gypsum mixed with different water types, with their different compositions influence the dimensional change, surface roughness and compressive strength of type IV and V gypsum specimens. Methods: Sixty specimens were fabricated from metal matrices and divided into six groups (n=10) according to the used type of gypsum and water: G1, G2 and G3 -type IV gypsum and tap, mineral and distilled water, respectively; G4, G5 and G6 -type V gypsum and tap, mineral and distilled water, respectively. Water/powder ratio followed the manufacturer's recommendations (19 mL/100 g) in all groups. The same specimens were used for all tests. A micrometer dial evaluated the dimensional change. The surface roughness of three random points was determined with a rugosimeter; a universal testing machine performed the compressive strength test. The data were subjected to analysis of variance (ANOVA). Results: There was no statistically significant difference (p>0.05) between the three types of water in the studied variables. There was statistically significant difference (p<0.05) between the gypsum mixes for the dimensional change variable. Conclusions: The different water types, with their different compositions, did not influence the analyzed physical and mechanical properties.

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The effects of a liquid dispersing agent and a microcrystalline additive on the physical properties of type IV gypsum

Cited by 14 publications

References 9 publications

The effect of disinfectants on the properties of dental gypsum: 1. Mechanical properties

The effect of disinfectants on the properties of dental gypsum: 1. Mechanical properties

The Effect of Different Water Types on The Water Powder Ratio of Dental Gypsum Products

Influence of different water types on the physical and mechanical properties of gypsum

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