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

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

doi:10.1053/jpro.2002.129049

Cited by 14 publications

(19 citation statements)

References 11 publications

(10 reference statements)

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“…Several substances and methods have been studied and are now established disinfection procedures for moulds, casts and related materials. These techniques include dipping the mould in disinfectant solution 8,9,12 , applying disinfectant spray over the mould 13 , immersing the casts 9 , and incorporating the disinfectant substances during the handling of the plaster [14][15][16][17] . In the present study, the latter technique was chosen to eliminate a step in the process of obtaining the casts, with the intention of reducing clinical practice time.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies 4,9,[14][15][16][17] have evaluated the effect of disinfectant substances on the mechanical properties of plaster. However, the majority of these studies examined the properties of plaster casts obtained after disinfecting the moulds with spray or by immersion, not by incorporating the disinfectant into the plaster solution.…”

Section: Discussionmentioning

confidence: 99%

“…Several authors have used distilled water as a control during their experiments on dimensional changes in plaster casts 8,14,17 . In the current study, saline was used as the control substance.…”

Section: Discussionmentioning

confidence: 99%

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Incorporation of disinfectants for obtaining dental stone: microbiological and dimensional evaluation

Nascimento

Ribeiro

Gadê-Neto

et al. 2015

Rev. odontol. UNESP

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ResumoObjetivo: Avaliar alteração dimensional e ação antimicrobiana de substâncias desinfetantes incorporadas durante manipulação do gesso. Material e método: In vivo -Micro-organismos foram coletados com swabs dos moldes de 30 voluntários, inoculados em Ágar BHI e incubados a 37 °C por 24 horas. Os moldes foram vazados com gesso tipo IV, manipulados com soro fisiológico (G1), hipoclorito de sódio 1% (G2) e clorexidina 4% (G3) substituindo a água. Decorrida 1 hora de presa fez-se duas coletas com swabs nos modelos, incubação e leituras das placas após 24 horas. Empregaram-se os testes Kruskal-Wallis e Wilcoxon com níveis de confiança de 99% e 95% respectivamente. In vitro -Inocularam-se S. mutans (ATCC25175), S. sanguis (ATCC10556) e E. faecalis (ATCC29212) em Ágar Müeller Hinton, onde posicionaram-se anéis de aço preenchidos com as mesmas substâncias do estudo in vivo. Após deposição do gesso e incubação, os halos foram medidos com paquímetro digital e os dados submetidos à ANOVA e Tukey com nível de confiança de 95%. Alteração dimensional -Com matriz metálica e moldeira perfeitamente adaptada padronizou-se eixo de inserção e força empregada para moldagem e obtenção de 30 corpos de prova em gesso tipo IV, seguindo a mesma distribuição dos grupos do estudo in vivo. Os corpos de prova foram mensurados pelo software Image Pro Plus e os dados submetidos à ANOVA e Tukey com nível de confiança de 95%. Resultado: Os dados do estudo in vivo demonstraram diferença significativa entre molde e cada modelo (p<0,001). No teste Wilcoxon não houve diferença significante entre grupos de modelos. In vitro-G2 apresentou maiores halos de inibição em todos micro-organismos testados em relação ao G3, mas com relação à alteração dimensional, houve diferença significante entre soluções e padrão metálico, onde G3 provocou menor alteração do que G2. Conclusão: Clorexidina 4% apresentou-se como o desinfetante mais adequado.Descritores: Microbiologia; clorexidina; hipoclorito de sódio; modelos dentários. AbstractAim: To assess dimensional change and antimicrobial activity of disinfectants substances incorporated during the dental stone manipulation. Material and method: In vivo -microorganisms were collected in alginate molds of 30 volunteers inoculated on BHI agar and incubated at 37 °C for 24 hours. The molds were cast with type IV gypsum, manipulated with saline (G1), 1% sodium hypochlorite (G2) and 4% chlorhexidine (G3), replacing the water. After setting of plaster with 1 hour two collections on models were made. After 24 hours, the readings were performed. The Kruskal-Wallis and Wilcoxon tests with confidence interval of 99% and 95% respectively were used. In vitro -Müeller Hinton agar petri dishes were inoculated with S. mutans (ATCC25175), S. sanguis (ATCC10556) and E. faecalis (ATCC29212), over which were placed steel rings filled with the same substances of the in vivo study. After deposition of gypsum and incubation, halos were measured with a digital caliper and data were submitted to ANOVA and Tukey's test with confidence in...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Incorporation of disinfectants for obtaining dental stone: microbiological and dimensional evaluation

Nascimento

Ribeiro

Gadê-Neto

et al. 2015

Rev. odontol. UNESP

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“…[9] An alternative method of using chemical disinfectant solutions as mixing-water substitutes was suggested. Others[1011] used both gum arabic and calcium hydroxide additives to modify the hemihydrate powder before mixing with aqueous solutions of chemical disinfectants, and the results showed an improvement of strength and hardness of the resultant disinfected materials without affecting other surface properties.…”

Section: Discussionmentioning

confidence: 99%

The effect of repeated immersion of gypsum cast in sodium hypochlorite and glutaraldehyde on its physical properties: An in vitro study

Kumar

Reddy²,

Karthigeyan³

et al. 2012

J Pharm Bioall Sci

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Background:One method used to disinfect a dental cast is immersion in a disinfecting solution. Repeated immersion of a cast in disinfectant may affect its physical properties.Purpose:The purpose of this study was to evaluate the changes in dimensional accuracy and hardness of the dental casts as a result of repeated disinfection in 0.525% sodium hypochlorite and 2% glutaraldehyde solutions.Materials and Methods:Sixty specimens were made of type III dental stone. Twenty specimens were immersed in slurry, a supernatant solution of calcium sulfate in distilled water (control casts), 20 specimens in 0.525% sodium hypochlorite, and 20 specimens in 2% glutaraldehyde solutions for 30 min and air dried for 24 h. This process was repeated for 7 times for testing. Linear dimensional change and hardness were determined according to American National Standards Institute/American Dental Association (ANSI/ADA) standards. The data were analyzed using two-way analysis of variance.Results:For specimens prepared with type III stones, treatment was by immersion in slurry (group I – control casts), and by immersion in 0.525% sodium hypochlorite (group II – test group 1) and in 2% glutaraldehyde solution (group III – test group 2). The specimens treated with sodium hypochlorite and glutaraldehyde showed more linear dimensional change compared to the specimens treated in slurry. However, the difference between test casts and control casts was significant. But the difference between the two test groups was not significant. Both the test groups showed decrease in hardness of the specimens compared to that specimens in control group. But the difference between two test groups was not significant in hardness. However,the values remained close to ANSI/ADA standards.Conclusion:The results demonstrated that repeated immersion of type III dental stone specimens in slurry with distilled water, 0.525% sodium hypochlorite and 2% glutaraldehyde, along with drying in air, caused a significant increase in linear dimension and a significant decrease in hardness.

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“…2 Concerns regarding the transmission of infectious organisms have prompted a rise in the measures for infection control throughout the health-care field. 4 All the patients must be individually categorized under the category of potentially infectious group, and therefore, separate handling of the impression should be done with great care. 5 The rising profile of conditions, such as hepatitis B and human immunodeficiency virus has helped to increase awareness of the risk of transmission of infection within the dental environment.…”

Section: Introductionmentioning

confidence: 99%

Self-disinfecting Alginate vs Conventional Alginate: Effect on Surface Hardness of Gypsum Cast—An in vitro Study

Madhavan

George

Thummala³

et al. 2017

The Journal of Contemporary Dental Practice

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Introduction: For the construction of any dental prosthesis, accurate impressions are necessary. Hence, we undertook the present study to evaluate and compare the surface hardness of gypsum casts poured from impressions made using conventional alginate and self-disinfecting alginate. Materials and methods:A total of 30 impressions of stainless steel die were made, out of which 15 impressions were made with conventional alginate and 15 were made with selfdisinfecting alginate and poured using Type III dental stone. Thirty stone specimens were subjected for hardness testing. Data were analyzed using independent samples t-test to compare the mean surface hardness.Results: Difference in surface hardness was statistically insignificant (p > 0.05). Conclusion:Surface hardness of gypsum casts poured using impressions made from self-disinfecting alginate and conventional alginates were comparable.Clinical significance: Self-disinfecting alginates may be employed in clinical practice as safe and effective materials to overcome the infection control issues without compromising on the properties of the material.

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

Cited by 14 publications

References 11 publications

Incorporation of disinfectants for obtaining dental stone: microbiological and dimensional evaluation

Incorporation of disinfectants for obtaining dental stone: microbiological and dimensional evaluation

The effect of repeated immersion of gypsum cast in sodium hypochlorite and glutaraldehyde on its physical properties: An in vitro study

Self-disinfecting Alginate vs Conventional Alginate: Effect on Surface Hardness of Gypsum Cast—An in vitro Study

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