scholarly journals Assessment of Sodium Thiosulfate Neutralizing Effect on Micro-hardness of Dentin Treated With Sodium Hypochlorite

2020 ◽  
Author(s):  
Safoora Sahebi ◽  
fereshteh Sobhnamayan ◽  
Mohammadhasan Naseri ◽  
Fariborz Moazami
Keyword(s):  
Sodium Hypochlorite ◽  
Normal Saline ◽  
Sodium Thiosulfate ◽  
Hardness Test ◽  
Control Group ◽  
P Value ◽  
Pairwise Comparisons ◽  
Micro Hardness ◽  
Neutralizing Agent ◽  
Vickers Micro Hardness

Abstract Background The aim of this study is to evaluate the ability of sodium thiosulfate (STS) to reverse the adverse effect of sodium hypochlorite (NaOCl) on dentin microhardness. Methods Fifty single-rooted teeth were decoronated and longitudinally sectioned. The samples were divided into a control and four sample groups (n = 20): Normal saline for 15 min as the control group, G1: 2.5% NaOCl for 15 min without an incubation period, G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min irrigated with normal saline followed by 5% Na2S2O3 for 10 min, G4: Normal saline for 15 min followed by 5% Na2S2O3 for 10 min. All groups except G1 were incubated for 1 week. The microhardness measurements were determined using the Vickers micro-hardness test. Data were analyzed using the Kruskal-Wallis test for pairwise comparisons. A p-value < 0.05 was considered significant. Results All groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for 1 week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with Na2S2O3 (G3) resulted in a significant decrease in microhardness compared with the Na2S2O3 group (G4) (p < 0.05). Conclusions Sodium thiosulfate as a neutralizing agent could not prevent the microhardness downturn caused by sodium hypochlorite

scholarly journals Assessment of sodium thiosulfate neutralizing effect on micro-hardness of dentin treated with sodium hypochlorite

2020 ◽  
Author(s):  
Safoora Sahebi ◽  
fereshteh Sobhnamayan ◽  
Fariborz Moazami ◽  
Mohammadhasan Naseri
Keyword(s):  
Adverse Effect ◽  
Sodium Hypochlorite ◽  
Normal Saline ◽  
Sodium Thiosulfate ◽  
Measured Data ◽  
Control Group ◽  
P Value ◽  
Pairwise Comparisons ◽  
Micro Hardness ◽  
Neutralizing Agent

Abstract Background: This study aims to evaluate the ability of sodium thiosulfate (STS) to neutralize the adverse effect of sodium hypochlorite (NaOCl) on dentin micro-hardness.Methods: Fifty single-rooted teeth were longitudinally sectioned. The samples divided into a control and four sample groups (n = 20). All the samples were immersed in different solutions as follows, Control: Normal saline for 15 min, G1and G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min, followed by 5% STS for 10 min, G4: Normal saline for 15 min followed by 5% STS for 10 min. All groups except G1 incubated for one week before the test. The micro-hardness of samples was measured. Data were analyzed using the Kruskal-Wallis test for pairwise comparisons. A p-value < 0.05 was considered significant. Results: All groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for one week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with STS (G3) resulted in a significant decrease in micro-hardness compared with the STS group (G4) (p < 0.05).Conclusions: STS as a neutralizing agent could not prevent the dentin micro-hardness downturn caused by NaOCl.

scholarly journals Assessment of sodium thiosulfate neutralizing effect on micro-hardness of dentin treated with sodium hypochlorite

2020 ◽  
Author(s):  
Safoora Sahebi ◽  
Fereshteh Sobhnamayan ◽  
Fariborz Moazami ◽  
Mohammadhasan Naseri
Keyword(s):  
Adverse Effect ◽  
Sodium Hypochlorite ◽  
Normal Saline ◽  
Sodium Thiosulfate ◽  
Measured Data ◽  
Control Group ◽  
P Value ◽  
Pairwise Comparisons ◽  
Micro Hardness ◽  
Neutralizing Agent

Abstract Background: This study aims to evaluate the ability of sodium thiosulfate (STS) to neutralize the adverse effect of sodium hypochlorite (NaOCl) on dentin micro-hardness.Methods: Fifty single-rooted teeth were longitudinally sectioned. The samples divided into a control and four sample groups (n = 20). All the samples were immersed in different solutions as follows, Control: Normal saline for 15 min, G1and G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min, followed by 5% STS for 10 min, G4: Normal saline for 15 min followed by 5% STS for 10 min. All groups except G1 incubated for one week before the test. The micro-hardness of samples was measured. Data were analyzed using the Kruskal-Wallis test for pairwise comparisons. A p-value < 0.05 was considered significant.Results: All groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for one week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with STS (G3) resulted in a significant decrease in micro-hardness compared with the STS group (G4) (p < 0.05). Conclusions: STS as a neutralizing agent could not prevent the dentin micro-hardness downturn caused by NaOCl.

scholarly journals Assessment of sodium thiosulfate neutralizing effect on micro-hardness of dentin treated with sodium hypochlorite

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Safoora Sahebi ◽  
Fereshteh Sobhnamayan ◽  
Fariborz Moazami ◽  
Mohammadhasan Naseri
Keyword(s):  
Adverse Effect ◽  
Sodium Hypochlorite ◽  
Normal Saline ◽  
Sodium Thiosulfate ◽  
Measured Data ◽  
Control Group ◽  
Pairwise Comparisons ◽  
Micro Hardness ◽  
Neutralizing Agent

Abstract Background This study aims to evaluate the ability of sodium thiosulfate (STS) to neutralize the adverse effect of sodium hypochlorite (NaOCl) on dentin micro-hardness. Methods Fifty single-rooted teeth were longitudinally sectioned. The samples divided into a control and four sample groups (n = 20). All the samples were immersed in different solutions as follows, Control: Normal saline for 15 min, G1and G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min, followed by 5% STS for 10 min, G4: Normal saline for 15 min followed by 5% STS for 10 min. All groups except G1 incubated for one week before the test. The micro-hardness of samples was measured. Data were analyzed using the Kruskal–Wallis test for pairwise comparisons. A p value < 0.05 was considered significant. Results All groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for one week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with STS (G3) resulted in a significant decrease in micro-hardness compared with the STS group (G4) (p < 0.05). Conclusions STS as a neutralizing agent could not prevent the dentin micro-hardness downturn caused by NaOCl.

Evaluation of the Resistance of Individual Si Die to Cracking

1998 ◽  
Author(s):  
R. Berriche ◽  
R.K. Lowry ◽  
M.I. Rosenfield
Keyword(s):  
Thermal Cycling ◽  
Hardness Test ◽  
Mechanical Stresses ◽  
Test Method ◽  
Processing Conditions ◽  
Micro Hardness ◽  
Test Methodology ◽  
Vickers Micro Hardness

Abstract The present work investigated the use of the Vickers micro-hardness test method to determine the resistance of individual die to cracking. The results are used as an indicator of resistance to failure under the thermal and mechanical stresses of packaging and subsequent thermal cycling. Indentation measurements on die back surfaces are used to determine how changes in wafer backside processing conditions affect cracks that form around impressions produced at different loads. Test methodology and results obtained at different processing conditions are discussed.

scholarly journals Effect of Application Time of Two Different Disinfectants on the Surface Roughness of an Elastomeric Impression Material

2020 ◽  
Author(s):  
Tahir Karaman ◽  
Faruk Oztekin ◽  
Samet Tekin
Keyword(s):  
Surface Roughness ◽  
Sodium Hypochlorite ◽  
Quaternary Ammonium ◽  
Rank Test ◽  
Control Group ◽  
P Value ◽  
Sodium Hypochlorite Solution ◽  
Application Time ◽  
Impression Material ◽  
Significant Difference

Introduction: Pathogens, such as cytomegalovirus, hepatitis B virus, hepatitis C virus, herpes simplex virus types 1 and 2, and human immunodeficiency virus are transmitted, threatening the health of dental laboratory workers, especially as a result of saliva and blood contact of patients. To prevent cross-infection, impression materials should be disinfected at the end of the impression process in the mouth. Aim: To study the effect of application time of sodium hypochlorite and quaternary ammonium-based disinfectant solution on the surface roughness of an elastomeric impression material. Materials and Methods: In this in-vitro study done during March 2020, 10 disc-shaped samples were used in each group, with a total of 110 samples obtained from a light body elastomeric impression material with dimensions of 15×3 mm. The samples were kept in a sodium hypochlorite solution (Wizard; Rehber Kimya, Istanbul, Turkey) at concentrations of 1% and 5% for 1, 5, 10, and 30 minutes and in a quaternary ammonium-based disinfectant (Zeta 7 Solution, Zhermack SpA, Italy) for 10 and 30 minutes. Surface roughness measurements were taken with a profilometer device. The data obtained were statistically analysed by Kolmogorov-Smirnov test and Wilcoxon signed rank test for dependent/paired groups for the continuous data. The significance level was set to α=0.05. Results: A statistically significant difference was found between the control group and the 1% sodium hypochlorite (30 min p-value 0.037), and 5% sodium hypochlorite (30 min p-value 0.017). The statistical evaluation of the surface roughness of the samples with different concentrations of sodium hypochlorite and the same times was done and found statistically significant at 30 mins, p-value 0.021. Conclusion: The prolonged application of the sodium hypochlorite disinfectant at 1% and 5% concentrations caused a significant increase in the light body elastomeric impression material’s surface roughness

scholarly journals The effect of Curcuminvs. Curcumin combined Antibiotic Ointmentson the Healing of skin wound

2021 ◽  
Vol 14 (3) ◽  
pp. 1587-1593
Author(s):  
Emad K. Abbas ◽  
Hussein H. Echrish ◽  
Sabaa A. Mohammed
Keyword(s):  
Wound Healing ◽  
Normal Saline ◽  
Biological Effects ◽  
Skin Wound ◽  
Control Group ◽  
P Value ◽  
Average Weight ◽  
Wide Range ◽  
Significant Difference ◽  
Animal House

Background:Turmeric is typically used as a spicy food preservative and colorant. It has been proved that curcumin has a wide range of biological effects including anti-inflammatory, anti-viral, anti-fungal, and curcumin activity that can improve antibiotic activity on the wounds. Objectives: To evaluate the effects of Curcumin with and without antibiotics on skin wound treatment. Materials and Methods: The protocol was approved by the animal house in medical college / Basra university. This study used nine male rabbits aged about 6 months and an average weight of (1.083 g). Each group consists of 3 rabbits: control group (normal saline) A, topical curcumin in group B, topical curcumin, and tetracycline ointment in group C. Regular treatments were given to rabbits in therapeutic groups. Result: The lowest Mean ± SDof swelling of suturing area was noted in both groups that treated by curcumin alone (9.07 ± 0.97 vs 15±1 mm, p value = 0.002) and that treated with curcumine and antibiotic (9.1±0.9vs 15±1 mm, p value = 0.002) versus the control group ( that treated by normal saline) and the lowest Mean ± SD of elevation of suture line was noted in both group that treated by curcumin alone (2.63 ± 0.06 vs 4.07±0.21 mm, p value >0.001) and that treated with curcumin and antibiotic (2.7 ± 0.2 vs 4.07±0.21 mm, p value =0.001) versus control group. There is no significant statistical difference between the Mean ± SD neither of swelling of suture area nor of elevation of suture lines of groups that treated by curcumin alone and group that treated with curcumin and antibiotic [(9.07 ± 0.97 vs 9.1 ±0.9, p value=0.97),(2.63±0.06 vs 2.7 ± 0.2, p value=0.61) respectively]. The histopathological evaluation is consistent with morphological changes as at day 3 of wound healing in both groups that treated by curcumine with and without antibiotic, there is formation a thin layer of keratin and absence of features that indicate delay wound healing such as hemorrhage, inflammatory cell infiltrate of (Neutrophils, macrophages and lymphocytes) and debris, which are detected in control group. Furthermore, at day 7 of control group, there is decrease of inflammation, presence of gap between the two edgesof the wound but no keratin formation. No clear histopathological difference in wound healing between tested groups that treated by curcumin with and without antibiotic. Conclusion: There issignificant clinical and histological evidences that the curcumin not only prevent delay of wound healing but it is also enhanced wound healing. No significant difference in using curcumin alone or combine it with local antibiotic.

scholarly journals The effect of antioxidants against electromagnetic field on enamel microhardness in rats

2019 ◽  
Vol 9 (3) ◽  
pp. 133-137
Author(s):  
Ahmet Aras ◽  
Mehmet Sinan Doğan ◽  
Mehmet Cihan Yavaş
Keyword(s):  
Electromagnetic Field ◽  
Field Intensity ◽  
Hardness Test ◽  
Control Group ◽  
Albino Rats ◽  
Homogeneity Test ◽  
Micro Hardness ◽  
Dental Tissues ◽  
Antioxidant Agents ◽  
Significant Difference

Aim: In current studies, it is reported that exposure to electromagnetic field (EMF) is related to numerous illnesses. Important parts of our bodies, oral and dental tissues can also be influenced by the EMF. In this study, it was aimed to determine possible negative impacts of EMFs on dental enamel hardness and to test the efficiency of the antioxidant agents against possible adverse effects. Methodology: In this study, 4-month-old 32 Winster strain Albino rats were used, each weighing 250-300 gr in average. In total, 40 teeth were used from these 32 rats. These teeth were classified into four groups. Group 1 was determined as the control group, and Group 2,3, and 4 were exposed to EMF measured as 2.48 μT magnetic field intensity and 80.3 V / m electric field intensity for 52 days. Ganodermalucidum (20 mg/kg/ day) was applied to the Group 3 together with the EMF. Melatonin (10 mg/kg/ day) was applied to the Group 4 together with the EMF. The teeth pulled out after the euthanasia were embedded into acrylic blocks and micro-hardness test was applied. The normality of the variables was analyzed through the Shapiro-Wilk test. After the homogeneity test, one-way analysis of variance (ANOVA) was used to compare surface micro-hardness (p<0.05). Results: As a result of the conducted statistical analyses, there was statistically no significant difference among the groups concerning micro-hardness (P>0.05). Conclusions: It was determined in our study that 52-day exposure to 2.48 μT EMF did not cause any micro-hardness change in the tooth enamels of the rats. It was also observed that the used antioxidant agents did not cause any significant difference.    How to cite this article: Aras A,  Doğan MS, Yavaş MC. The effect of antioxidants against electromagnetic field on enamel microhardness in rats. Int Dent Res 2019;9(3):133-7.   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Effectiveness of periurethral cleaning solution to bacteria colonization count at periurethral area prior to urinary catheterization.

2016 ◽  
Vol 1 (1) ◽  
pp. 66
Author(s):  
Kristina Lisum ◽  
Ni Luh Widani
Keyword(s):  
Patient Safety ◽  
Normal Saline ◽  
Povidone Iodine ◽  
Control Group ◽  
P Value ◽  
Regression Result ◽  
Post Intervention ◽  
Cleaning Solution ◽  
Quasi Experimental ◽  
Reducing Bacteria

<div align='justify> Introduction :Patient safety is an important element that must be notice when providing care to patients, including nurse. The incidence of catheterized patient increasingly 25 % from total patients that hospitalized can lead urinary tract infection.  The purpose of this study was to compare the effectiveness of cleaning periurethral with povidone iodine 10 %, povidone iodine 2 % and normal saline to bacteria colonization prior to catetherization. Methods : This study used quasi-experimental, pre and post intervention design with control group.  Result : Periurethral swabs were obtained from a total 60 patients ( povidone iodine 10 % as control group , 20;  povidone iodine 2 %, 20; normal saline, 20).  Through paired t-test ,there  was significant decreased  (p value : .00; p < .05) in bacteria colonization count  using povidone iodine 2% and normal saline ; using  povidone iodine  10 %  , there was no significant decreased (p value : .55; p >.05) in bacteria colonization count. While, a simple linear regression result that povidone iodine 2% is the most effective solution on reducing bacteria colonization in periurethral area rather than other solution. In addition, recommendation needed to test bacteria colonization in urine culture using those periuretral cleaning solutions. Keyword: periurethral cleaning, patient safety, povidone iodine 2%, povidone iodine 10%, normal saline

Deproteinizing Agents as an Effective Enamel Bond Enhancer-An in Vitro Study

2017 ◽  
Vol 41 (4) ◽  
pp. 280-283 ◽  
Author(s):  
Pallavi Hasija ◽  
Vinod Sachdev ◽  
Shivani Mathur ◽  
Rishi Rath
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acid Etching ◽  
Control Group ◽  
P Value ◽  
Group 4 ◽  
Significant Difference ◽  
Group 1

Objective: The aim of this study was to compare the effect of different deproteinizing agents on shear bond strength of composite to primary teeth enamel. Study Design: Forty sound primary molars divided in 4 groups of 10 teeth each. In control group 1, enamel was etched for 60 seconds with 37% phosphoric acid and rinsed with water. Group 2: after acid etching deproteinizing agent 5 % sodium hypochlorite was applied for 60 seconds and rinsed. Group 3: after acid etching deproteinizing agent papain gel was applied for 60 seconds and rinsed. Group 4: after acid etching deproteinizing agent bromelain gel applied for 60 seconds and rinsed. Following this, bonding agent was applied to treated enamel surface and composite resin disc were build. Samples were then tested for shear bond strength using Universal Testing Machine. Results: Mean SBS was highest for group 4 and lowest for group 1. No statistically significant difference (p value &gt;0.05) was found between all the four groups. Conclusion: Among deproteinizing agents, deproteinization when carried out with bromelain gel and sodium hypochlorite showed effective bond strength as compared to papain.

scholarly journals Evaluation the Effect of different Cooling Cycles on the Hardness Surface of the Conventional Feldspathic Zirconia

2021 ◽  
Vol 3 (3) ◽  
pp. 96-101
Author(s):  
Shahad Hazim Ali ◽  
Lateef Essa Alwan ◽  
Abdul Kareem J. Al-Azzawi
Keyword(s):  
Room Temperature ◽  
Cooling System ◽  
Surface Hardness ◽  
Hardness Test ◽  
Control Group ◽  
P Value ◽  
Residual Tensile Stress ◽  
Slow Cooling ◽  
Fast Cooling ◽  
The Impact

Cooling rate is the main fact in success and life span of all ceramic restoration through its effect on mechanical properties and producing a residual tensile stress, crack propagation and failure restorations. The goals of this study is to assess the impact of diverse cooling cycles (slow cooling – fast cooling) on the surface hardness of the Zirconia (VM9). A total of 30 conventional Y-TZP Zirconia (Vita VM9) disks were fabricated according manufacturers recommendation. The samples were partition into three categories depending on the cooling system. Each group consisted of ten specimens in diameter (2mm×10mm). Control group: samples are unescorted by any change. Fast cooling group: these specimens were fast cooled after second firing (910C0 -600C0) with opening Oven muffle 25% withholding time for 5 minute and remove from the furnace to cool at room temperature. Slow cooling group: specimens were slow cooled after second firing (910C0 -400C0) with opening Oven muffle 25% withholding time for 5 minute and remove from the furnace to cool at room temperature. Each specimen was subjected to hardness test in load 9.8N at 15s using Digital microvickers Hardness tester, Scanning electron microscope. The statistical analysis revealed that, the highest vickers hardness mean value was for the control group (690.57 ± 69.9563) and for second group (618.12± 53.6164) and for third group (631.75±65.3858), The facts were statistically examined by applying ANOVA test (P- value) testes which revealed significant differences(p=0.038) (p<0.05) among groups. Conclusion: The impact of cooling cycle on the hardness surface measurements of the Zirconia (Vita VM9) between the three groups was significant. The slow cooling shows a higher value of (VH) Hardness and recommended for Zirconia than the fast cooling.

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