The effect of disinfectants on the properties of dental gypsum, part 2: Surface properties

Abdelaziz, Khalid M.; Combe, E.C.; Hodges, James S.

doi:10.1111/j.1532-849x.2002.00234.x

Cited by 18 publications

(7 citation statements)

References 13 publications

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“…Sufficient quality ensures a satisfactory function [22], which in the domain of dental models, represents the fit of the denture, particularly with saw-cut models [23]. The electric profile method with mechanical contact has been shown to be effective for the quantitative evaluation of surface qualities [9,24,25,26].…”

Section: Discussionmentioning

confidence: 99%

Surface Quality of 3D-Printed Models as a Function of Various Printing Parameters

et al. 2019

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Although 3D-printing is common in dentistry, the technique does not produce the required quality for all target applications. Resin type, printing resolution, positioning, alignment, target structure, and the type and number of support structures may influence the surface roughness of printed objects, and this study investigates the effects of these variables. A stereolithographic data record was generated from a master model. Twelve printing processes were executed with a stereolithography Desktop 3D Printer, including models aligned across and parallel to the printer front as well as solid and hollow models. Three layer thicknesses were used, and in half of all processes, the models were inclined at 15°. For comparison, eight gypsum models and milled polyurethane models were manufactured. The mean roughness index of each model was determined with a perthometer. Surface roughness values were approximately 0.65 µm (master), 0.87–4.44 µm (printed), 2.32–2.57 µm (milled), 1.72–1.86 µm (cast plaster/alginate casting), and 0.98–1.03 µm (cast plaster/polyether casting). The layer height and type and number of support structures influenced the surface roughness of printed models (p ≤ 0.05), but positioning, structure, and alignment did not.

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Section: Discussionmentioning

confidence: 99%

Surface Quality of 3D-Printed Models as a Function of Various Printing Parameters

et al. 2019

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“…As an essential auxiliary material, dental gypsum has been used for simulating oral cavity models. Put a certain amount of dental gypsum powder and water in a small rubber bowl to knead the gypsum slurry and then cast the slurry into the oral mold to prepare dental restoration, such as an inlay, a crown, a bridge, a partial denture, and a complete denture [2][3][4]. The manufacture of denture model is the basis of denture processing, and the dimensional stability of gypsum is fundamental to achieving a precise fit between dental structure and restorative material [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Additives on the Hydration and Gelation Properties of Composite Dental Gypsum

Xie

Evelina

et al. 2021

Gels

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Dental mold gypsum materials require fine powder, appropriate liquidity, fast curing, and easy-to-perform clinical operations. They require low linear expansion coefficient and high strength, reflecting the master model and facilitating demolding. In this article, the suitable accelerators and reinforcing agents were selected as additives to modify dental gypsum. The main experimental methods used were to compare the trends of linear expansion coefficients of several commercially available dental gypsum products over 72 h and to observe the cross-sectional microstructure of cured bodies before and after dental gypsum modification using scanning electron microscopy. By adjusting the application of additives, the linear expansion coefficient of dental gypsum decreased from 0.26% to 0.06%, while the flexural strength increased from 6.7 MPa to 7.4 MPa at 2 h. Formulated samples showed good stability and gelation properties with linear expansion completed within 12 h. It is indicated that the performance of dental gypsum materials can be improved by adding additives and nanomaterials, which provided a good reference for clinical preparation of high-precision dental prosthesis.

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“…These materials include impressions, casts, dental prostheses and appliances, which are often heavily contaminated with microorganisms from saliva and blood. 1 The American Dental Association (ADA) and the Center for Disease Control recommend that the dental impressions and gypsum casts be disinfected before use. 2 Dental stone casts are potentially subject to crosscontamination in prosthodontics because of frequent times exposed to the transfer of infectious agents from blood and saliva to the casts through impressions, record bases and occlusion rims and trial dentures.…”

Section: Introductionmentioning

confidence: 99%

“…A critical study by Stern et al has demonstrated that disinfecting the definitive cast at least seven times from the time of fabrication through insertion of complete or removable partial prostheses is crucial. 3 Two major methods have been proposed to disinfect dental casts, including (1) immersing or spraying the casts with disinfecting solutions, and (2) introducing disinfecting chemicals into gypsum at the time of mixing or using die stone containing disinfectant. 4,5 The immersion of dry casts like gypsum in water or aqueous solutions may be accompanied with the dissolution of sufficient amount of cast material causing a measurable reduction in the dimension of the cast.…”

Section: Introductionmentioning

confidence: 99%

“…In dentistry, in particular, the need for disinfecting procedures is crucial because of either direct or indirect contact of handle materials with patients’ oral tissues and personnel in dental laboratories. These materials include impressions, casts, dental prostheses and appliances, which are often heavily contaminated with microorganisms from saliva and blood 1. The American Dental Association (ADA) and the Center for Disease Control recommend that the dental impressions and gypsum casts be disinfected before use 2…”

Section: Introductionmentioning

confidence: 99%

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Influence of chemical disinfection on mechanical and structural properties of type III and IV dental stones

Moslehifard¹,

Nasirpouri²,

Mahboub³

et al. 2012

Advances in Applied Ceramics

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We report on the effect of chemical disinfection in aqueous 1% virkon, 0?525% hypochlorite and slurry solutions on the mechanical and structural properties of type III and IV dental stones. For both dental stones, compressive strength and diametral tensile strength decrease with the application of all types of disinfectants. Virkon disinfectant decreases the mechanical strength with the lowest magnitude. The X-ray diffraction patterns of samples show the existence of dihydrate and hemihydrates microcrystals along with traces of CaSO 4 .xH 2 O (x50?02-0?48) in as prepared samples, but do reveal that hemihydrate phase is removed after spraying disinfectants. Fractography of the dental stones clearly indicates that the separation between the microcrystals is widened by the disinfection process as a consequence of the possible dissolution of last precipitated gypsum phases. The mechanical properties of the dental stones are effectively decreased after disinfection to different levels.

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The effect of disinfectants on the properties of dental gypsum, part 2: Surface properties

Cited by 18 publications

References 13 publications

Surface Quality of 3D-Printed Models as a Function of Various Printing Parameters

Surface Quality of 3D-Printed Models as a Function of Various Printing Parameters

The Effect of Different Additives on the Hydration and Gelation Properties of Composite Dental Gypsum

Influence of chemical disinfection on mechanical and structural properties of type III and IV dental stones

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