Evaluation of disinfected casts poured in gypsum with gum arabic and calcium hydroxide additives

Abdelaziz, Khalid M.; Attia, Ahmed; Combe, E.C.

doi:10.1016/j.prosdent.2004.04.004

Cited by 8 publications

(16 citation statements)

References 15 publications

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“…These findings were probably due to different solubility rates of hemihydrate that alters the crystal growth and the amount of outward thrust. The results of the present study disagree with those of Breault et al 22 and Abdelaziz et al, 14 who…”

contrasting

confidence: 99%

“…It may be because of the reason that these materials, i.e., sodium hypochlorite and iodophor, altered the characteristics of expansion and, as a result of that, led to the contraction of the material during setting. 21 The results of this study are in accordance with the study done by Abdelaziz et al, 14 who reported a significant change in dimensional accuracy of type III and type IV dental stone after incorporation of sodium hypochlorite and iodophor as water substitutes in dental stone. Initially, expansion occurs during the setting of gypsum because dihydrate crystals show thrusting action.…”

supporting

confidence: 90%

“…Ivanovski et al 13 concluded that glutaraldehyde evaporates from the mixed material, leading to incomplete solubility of some of the hemihydrate particles. 17 The results of this study are in accordance with those of Mahler, 18 Abdelaziz et al, 14 Roy et al, 12 Ivanovski et al, 13 Mensfield et al, 19 and Sabouhi et al, 20 who stated a decrease in surface hardness of die stone after incorporation of disinfectants.…”

supporting

confidence: 88%

“…Ivonovski et al 13 "reported a reduction in compressive strength after the incorporation of sodium hypochlorite as disinfecting agent." Abdelaziz et al 14 also reported a reduction in compressive and tensile strengths of types III and V dental stone after the incorporation of sodium hypochlorite. It is assumed that sodium ions from the sodium hypochlorite interfere with calcium compounds in the gypsum structure and affect its strength.…”

mentioning

confidence: 95%

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Effect of Incorporation of Disinfectants on Surface Hardness and Dimensional Accuracy of Die Stone: An in vitro Study

Bakshi¹,

Dang²

2017

International Journal of Prosthodontics and Restorative Dentistry

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Aim: To evaluate surface hardness and dimensional accuracy of type IV dental stone after incorporation of disinfectants. Materials and methods:A total of 100 specimens, 50 (40 mm × 10 mm) disk shaped and 50 frustum cone shaped, were fabricated from type IV dental stone after incorporation of various disinfectants, namely glutaraldehyde (2%), iodophor (1.76%), chlorhexidine (2%), and sodium hypochlorite (1%), for evaluation of surface hardness and dimensional accuracy. Surface hardness was tested after 1-and 24-hour time interval using Rockwell hardness testing machine. Dimensional accuracy was measured using traveling microscope. Data obtained were compiled and analyzed statistically by using analysis of variance and post hoc test. Results:Results showed significant decrease in surface hardness of samples incorporated with disinfectants at 1 hour as compared with control (distilled water). Surface hardness of all the samples increased with time and was almost equal to control group at 24-hour interval, with iodophor showing the maximum value in comparison with the other disinfectants used. When dimensional accuracy of all the groups was compared, iodophor and sodium hypochlorite were found to cause negative alterations. Conclusion:Within the limitations of this in vitro study, it was concluded that incorporation of disinfectants in die stone during mixing did not affect the hardness value at 24-hour interval. Dimensional accuracy was altered by iodophor and sodium hypochlorite, but remained unaffected by chlorhexidine and glutaraldehyde. Keywords

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confidence: 99%

supporting

confidence: 90%

supporting

confidence: 88%

mentioning

confidence: 95%

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Effect of Incorporation of Disinfectants on Surface Hardness and Dimensional Accuracy of Die Stone: An in vitro Study

Bakshi¹,

Dang²

2017

International Journal of Prosthodontics and Restorative Dentistry

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“…However, in other cases, tensile strength is of more importance, 15 e.g., when teeth fracture from a gypsum cast, they do so by failing in tension, especially during removal of stone casts with long and narrow tooth preparations, from elastomeric impressions. 16 The oral environment harbors a large number of microorganisms in the saliva and blood that may contain infectious microbes. While the majority of these organisms pose no significant risk to dental professionals, a number of them cause infectious diseases that may be incurable, such as those caused by the hepatitis C and human immunodeficiency virus viruses.…”

Section: Discussionmentioning

confidence: 99%

Comparative Evaluation of Tensile Strength in Die Stone Incorporated with Sodium and Calcium Hypochlorite as Disinfectants: An in vitro Study

Pramodh

Naik

Mahesh

et al. 2017

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to evaluate the tensile strength of die stone incorporated with sodium and calcium hypochlorite as disinfectants. Materials and methods:Two commercially available type IV die stone (Kalrock: Kalabhai Karson Pvt., Ltd and Pearlstone: Asian Chemicals) and two commercially available disinfectant solutions (sodium hypochlorite and calcium hypochlorite: Beachem Laboratory Chemical Private Limited, Chennai and Leo Chem Private Limited, Bengaluru) were used in this study, and the tensile strength was measured using Lloyd's Universal Testing Machine. Results:The results show that incorporating the disinfecting solutions decreases the tensile strength of both products. The effect of decreasing tensile strength on type IV gypsum product is seen more in calcium hypochlorite when compared with sodium hypochlorite disinfecting solution, and the tensile strength of Kalrock specimens is higher than Pearlstone specimens after disinfecting with sodium hypochlorite and calcium hypochlorite solution. The statistical results also show significant results in all the groups when compared with the control group. Conclusion:The incorporation of sodium and calcium hypochlorite disinfecting solutions is not an encouraging method for both die materials as it reduces the tensile strength of type IV gypsum product. Tensile strength of Kalstone ® die material is superior than Pearlstone ® die material after mixing with sodium hypochlorite and calcium hypochlorite. Control and Prevention, disinfecting the whole cast without or minimal changes in physical and mechanical properties was the motto of the study. The tensile strength in type IV gypsum product plays a most important role in retrieval of cast from impression, especially in narrow tooth preparation. This study reveals that incorporating method of disinfecting solutions is not recommended as it reduces the tensile strength.

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Comparison of the Effect of Addition of Cyanoacrylate, Epoxy Resin, and Gum Arabic on Surface Hardness of Die Stone

Tripathi

Gupta

Bagchi

et al. 2015

Journal of Prosthodontics

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Observations from this study showed that the addition of gum arabic increases resistance to abrasion in type IV gypsum. Cyanoacrylates are good adhesives as well, but a major drawback is that they have very low resistance to chemical action with water and physical actions such as sunlight. Epoxy resins are powerful adhesives, but they attain their full efficiency when cured with heat. Cyanoacrylate and epoxy resin displayed poor physical bonding, primarily because of inhomogeneity.

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Evaluation of disinfected casts poured in gypsum with gum arabic and calcium hydroxide additives

Cited by 8 publications

References 15 publications

Effect of Incorporation of Disinfectants on Surface Hardness and Dimensional Accuracy of Die Stone: An in vitro Study

Effect of Incorporation of Disinfectants on Surface Hardness and Dimensional Accuracy of Die Stone: An in vitro Study

Comparative Evaluation of Tensile Strength in Die Stone Incorporated with Sodium and Calcium Hypochlorite as Disinfectants: An in vitro Study

Comparison of the Effect of Addition of Cyanoacrylate, Epoxy Resin, and Gum Arabic on Surface Hardness of Die Stone

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