scholarly journals The effect of glycerin on the surface hardness and roughness of nanofill composite

2019 ◽  
Vol 8 (2) ◽  
pp. 104
Author(s):  
Diana Zakiyah ◽  
Ruslan Effendy ◽  
Edhie Arif Prasetyo
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Surface Hardness ◽  
Test Results ◽  
Inhibition Layer ◽  
Chain Reaction ◽  
Oxygen Inhibition ◽  
Significant Difference ◽  
Group A ◽  
Group B

Background: Present research studied the surface hardness and roughness dependence on polymerization. Polymerization of composites occurs through chain reaction that is induced by free radicals. Oxygen in the air decreases the excitability of the photo initiator, causing polymerization interference. Oxygen inhibition layer (OIL) is formed on the surface. OIL can be reduced by curing the composite through by application of glycerin to the surface. Purpose: To determine the effect of glycerin on the surface hardness and roughness of nanofill composite. Material and Methods: 64 specimens of composite (Z350 XT, 3M) were prepared using a disc-shaped acrylic. The groups were divided into group A surface hardness (N=32) and group B surface roughness (N=32). Group A1, the specimen was coated with glycerin and light cured for 20 s and group A2, the specimen was exposed to air and light cured for 20 s. Group B1 was coated with glycerin and light cured for 20 s and Group B2 was exposed to air and light cured for 20 s. The specimens were stored in distilled water for 24 h at 370. Measuring with Vickers and surface roughness tester and. Data were statistically analyzed using Mean-whitney U Test. Results: There were statiscally significant difference between the surface hardness and roughness of nanofill composite coated with glycerin and without glycerin (p<0,05) Conclusion: The surface hardness of nanofill composite resin coated with glycerin is higher than composite without glycerin and the surface roughness of nanofill composite resin coated with glycerin is lower than composite without glycerin

scholarly journals Comparison of microleakage of an alkasite restorative material, a composite resin and a resin-modified glass ionomer

2021 ◽  
Vol 20 ◽  
pp. e213981
Author(s):  
Fariba Motevasselian ◽  
Hamid Kermanshah ◽  
Ebrahim Rasoulkhani ◽  
Mutlu Özcan
Keyword(s):  
Composite Resin ◽  
Composite Resins ◽  
Glass Ionomer ◽  
Etch And Rinse ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Group A ◽  
Nanohybrid Composite ◽  
Group B ◽  
Group D

Aim: To compare the microleakage of Cention N, a subgroup of composite resins with a resin-modified glass ionomer (RMGI) and a composite resin. Methods: Class V cavities were prepared on the buccal and lingual surfaces of 46 extracted human molars. The teeth were randomly assigned to four groups. Group A: Tetric N-Bond etch-and-rinse adhesive and Tetric N-Ceram nanohybrid composite resin, group B: Cention N without adhesive, group C: Cention N with adhesive, and group D: Fuji II LC RMGI. The teeth were thermocycled between 5°-55°C (×10,000). The teeth were coated with two layers of nail vanish except for 1 mm around the restoration margins, and immersed in 2% methylene blue (37°C, 24 h) before buccolingual sectioning to evaluate dye penetration under a stereomicroscope (×20). The data were analyzed by the Kruskal-Wallis and Wilcoxon tests (α=0.05). Results: Type of material and restoration margin had significant effects on the microleakage (p<0.05). Dentin margins showed a higher leakage score in all groups. Cention N and RMGI groups showed significant differences at the enamel margin (p=0.025, p=0.011), and for the latter group the scores were higher. No significant difference was found at the dentin margins between the materials except between Cention N with adhesive and RMGI (p=0.031). Conclusion: Microleakage was evident in all three restorative materials. Cention N groups showed similar microleakage scores to the composite resin and displayed lower microleakage scores compared with RMGI.

scholarly journals Comparison Of Diacerein-Ginger With Diacerein Alone In Treating Knee Osteoarthritis

2019 ◽  
Vol 09 (04) ◽  
pp. 308-311
Author(s):  
Mehtab Munir ◽  
Shahid Mustafa Memon ◽  
Sajid Abbas Jaffri ◽  
Khalid Mustafa Memon
Keyword(s):  
Knee Osteoarthritis ◽  
P Value ◽  
Womac Pain ◽  
Test Results ◽  
Knee Oa ◽  
Significant Difference ◽  
Group A ◽  
Insignificant Difference ◽  
Group B ◽  
Pain At Rest

Objective: To compare clinical efficacy of diacerein-ginger with diacerein alone in treating knee osteoarthritis. Duration and place of study: It was a randomized clinical trial conducted from 21st September 2018 to 31stMarch 2019, in medical OPD of a private hospital in Karachi. Methodology: 60 diagnosed patients of knee osteoarthritis were included in this study. Male and female patients 50 years of age, fulfilling the inclusion criteria and after written informed consent experienced a wash-out period of 72 hours. These patients were systematically randomized into 2 groups each having 30 members. Group A received capsule Diacerein 50mg + capsule Ginger 550 mg twice daily and group B received capsule Diacerein 50mg twice daily, for 12 weeks. Parameters checked at 0, 6 and 12 weeks were: Western Ontario and McMaster Universities Osteoarthritis (WOMAC) index, pain at rest and movement (Visual Analogue Scale). Comparison of the two groups was done by independent t-test. Results: Among 60 patients; 20 (33.33 %) were males and 40 (66.66%) were females. 4 patients in group A and 4 in B, dropped out during the study. Comparison of group A with group B in WOMAC and pain (at rest and movement) scores showed insignificant difference at day 0 before prescription of the drugs. However comparison showed highly significant difference (P-value < 0.001) between the two groups in WOMAC, pain at rest and movement scores at the end of 6th and 12th weeks of intervention. Conclusion: Diacerein-Ginger is clinically more efficacious for management of knee OA than Diacerein alone

scholarly journals Application Value of Coagulation Function Test in Prognosis of Patients with Cardiovascular and Cerebrovascular Diseases

2021 ◽  
Vol 9 (4) ◽  
pp. 89
Author(s):  
Jing Luo
Keyword(s):  
Cerebrovascular Diseases ◽  
Good Prognosis ◽  
Control Group ◽  
Study Group ◽  
Test Results ◽  
Coagulation Function ◽  
Significant Difference ◽  
Function Test ◽  
Group A ◽  
Group B

<p><span lang="EN-US">Objective: to explore the application value of coagulation function test in the prognosis of patients with cardiovascular and cerebrovascular diseases. Methods: from December 2018 to December 2019, 100 patients with cardiovascular and cerebrovascular diseases were randomly selected as the study group. According to the follow-up results of patients, they were divided into study group A (good prognosis, n = 64) and study group B (disability or death, n = 36) 100 subjects served as the control group. The test results of coagulation function of the two groups were analyzed retrospectively. The test results of the study group before and after treatment were compared with those of the control group, and the test results of the study group A and study group B after treatment were compared. Results: the coagulation function of the study group after treatment was significantly improved compared with that before treatment (P &lt; 0.05), and there was a significant difference between the two groups before treatment (P &lt; 0.05), and there was no difference after treatment (P &gt; 0.05); after treatment, the coagulation function of study group A and study B was significantly different (P &lt; 0.05). Conclusion: coagulation function test has a certain application value for the prognosis of patients with cardiovascular and cerebrovascular diseases, and can be used as an index to judge the patient’s condition and treatment effect, which has good application value in clinical practice.</span></p>

Analysis of Roughness and Surface Hardness of a Dental Composite Using Atomic Force Microscopy and Microhardness Testing

2011 ◽  
Vol 17 (3) ◽  
pp. 446-451 ◽  
Author(s):  
Marcos Aurélio Bomfim da Silva ◽  
Aline Barbirato Fardin ◽  
Renata Carvalho Cabral de Vasconcellos ◽  
Lucineide de Melo Santos ◽  
Josealdo Tonholo ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Artificial Saliva ◽  
Soft Drink ◽  
Surface Hardness ◽  
Dental Composite ◽  
Force Microscopy ◽  
Atomic Force ◽  
Group A ◽  
Group B ◽  
Group D

AbstractThe objective of this study was to evaluate the influence of a cola soft drink (CSD) and coffee on the microhardness and surface roughness of composite resin. Fifty cavities were prepared on the vestibular surface of bovine incisors and restored with nanoparticulate resin. The teeth were divided into five groups (n= 10): group A (control), immersion in artificial saliva (AS) for 14 days; group B, immersion in coffee for 15 min (3×/day) for 7 days followed by immersion in AS for another 7 days; group C, immersion in CSD for 15 min (3×/day) for 7 days followed by immersion in AS for another 7 days; group D, immersion in AS for 7 days, immersion in coffee for 15 min (3×/day) for 7 days; group E, immersion in AS for 7 days, immersion in CSD for 15 min (3×/day) for 7 days. After the immersion periods the specimens were analyzed for their microhardness and surface roughness. The data were subjected to analysis of variance (ANOVA) followed byt-test with 5% significance. Group A presented the highest average microhardness and lowest surface roughness, so it was possible to conclude that the consumption of CSD and coffee alters the microhardness and surface roughness of new restorations.

scholarly journals The difference between porcelain and composite resin shear bond strength in the administration of 4% and 19.81% silane

2019 ◽  
Vol 52 (1) ◽  
pp. 27
Author(s):  
Ira Widjiastuti ◽  
Dwina Rahmawati Junaedi ◽  
Ruslan Effendy
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Resin Composite ◽  
Repair Process ◽  
Direct Repair ◽  
Significant Difference ◽  
Group A ◽  
The Difference ◽  
Group B

Background: Damage to porcelain restorations such as fractures requires a repair that can be performed either directly or indirectly. Direct repair involves directly performing restoration of fractured porcelain with a composite resin application. This technique has more advantages than indirect repair because it requires no laboratory work and can be completed during a single visit. Silane, on the other hand, has been widely used and is reported to increase porcelain and composite resin attachments during the direct repair process. Purpose: This study aimed to determine the differences in shear bond strength between porcelain and composite resin during the administering of 4% and 19.81% silane. Methods: 27 porcelain samples were divided into three groups, namely: Group A - 4% silane, Group B - 19.81% silane and Group C - no silane, prior to the application of composite resin. Each sample was tested for shear bond strength by means of Autograph and fracture analysis performed through stereomicroscope and scanning electron microscope tests. Data analysis was subsequently performed using an ANOVA test. Results: There was a significant difference between the three groups with p=0.000 (p<0.005). The lowest bond strength was found in the group without silane, while the highest was in the group with 4% silane (p<0.005). Conclusion: The use of 4% silane can produce the highest shear bond strength of porcelain and resin composite.

scholarly journals Efficacy of casein phosphopeptide varnish reducing dental hypersensitivity: A randomized clinical trial

2020 ◽  
Vol 3 (1) ◽  
pp. 7-11
Author(s):  
Rakhi A. Bapna ◽  
◽  
Neema Shetty ◽  
Aditi Mathur ◽  
Ashish Bali ◽  
...  
Keyword(s):  
Dentin Hypersensitivity ◽  
Test Results ◽  
Variable Intensity ◽  
Intergroup Comparison ◽  
Significant Difference ◽  
Group A ◽  
Chemical Stimuli ◽  
Casein Phosphopeptide ◽  
Group B ◽  
Dentinal Hypersensitivity

Introduction: Dentin hypersensitivity (DH) is the most common concern faced by most dentists in their day-to-day clinical practice. It is characterized by short-term, acute pain of variable intensity, which occurs in response to thermal, tactile, osmotic or chemical stimuli that cannot be attributed to any other type of defect or dental decay. Casein phosphopeptide varnish is a newer material used to treat dentinal hypersensitivity as it reduces demineralization and promotes remineralization. The aim of this study is to evaluate the efficacy of casein phosphopeptide based varnish (MI Varnish®) vs sodium fluoride-based varnish (Fluoritop SR® varnish) in treating dentinal hypersensitivity. Materials and methods: 40 subjects with a chief complaint of DH were divided into two equal groups, Group A (MI varnish®) and Group B (Fluoritop SR® varnish). Scaling and root planing was done and sensitivity was assessed using Visual analog scale (VAS) at baseline. On the 14th day, sensitivity was reassessed using VAS. The data obtained were subjected to statistical analysis using students‘t’ test. Results: On intragroup comparison, VAS scale showed a statistically significant difference for both the groups. On intergroup comparison, no statistical difference was found between both groups. (p = 0.139) Conclusions: From the above results, it can be concluded that MI varnish® and Fluoritop SR® varnish are equally efficacious in reducing dentinal hypersensitivity.

scholarly journals Changes in boar semen with a high and low level of morphologically abnormal spermatozoa

2011 ◽  
Vol 50 (No. 7) ◽  
pp. 289-299 ◽  
Author(s):  
J. Čeřovský ◽  
S. Frydrychová ◽  
A. Lustyková ◽  
M. Rozkot
Keyword(s):  
Performance Test ◽  
Sperm Quality ◽  
Sperm Concentration ◽  
Test Results ◽  
Semen Volume ◽  
Significant Difference ◽  
Group A ◽  
Boar Semen ◽  
Group B ◽  
Selection Of

The aim of the paper was to find out the level of changes in the sperm quality in two groups of boars in the insemination (A and B) with diametrically different contents of morphologically abnormal spermatozoa (AS) with an interval of 25 weeks between semen collection I and collection II. In the group A there were 22 boars with the AS content up to 10%, in the group B 16 of boars with the AS content above 40% in collection I. Both groups were comparable concerning the parameters of the performance test results and in quantitative parameters of the semen from collection I. They differed significantly in the AS content (P &lt; 0.01) and in the age (P &lt; 0.05). In collection II in both groups the semen volume increased significantly (A &ndash; P &lt; 0.01; B &ndash; P &lt; 0.05), in the group A the number of spermatozoa per ejaculate and per day also increased (P &lt; 0.01). In the group B there was an insignificant clear decrease in the sperm concentration (P &gt; 0.05). In comparison with the group B the group A can be characterized as a group with significantly higher dynamics in the sperm production per ejaculate. An opposite trend was noted in the total AS content. In the group A there was a significant increase (P &lt; 0.001) and in the group B a significant decrease (P &lt; 0.001) in collection II. In the group A there was a deterioration of the AS content in 7 boars (31.8%), in the group B an improvement in 7 boars (43.7%). Particular monitored AS forms are given. A significant difference in the total AS content between both groups was in favour of the group A (P&lt; 0.001). While no boars from the group A exceeded the limit in the AS content for the applicability of semen for insemination (in theCzech &nbsp; Republic25%), in the group B they remained above this limit without applicability possibility. The detected variations and prevailing stability in the AS occurrence in boars kept in the same conditions lead us to a consideration of hereditary characteristics of the spermatogenesis factor, of considerable persistence of the level of monitored characteristics and to a consideration of applicability of the phenotype AS presentation to selection of boars for artificial insemination. &nbsp; &nbsp;

scholarly journals The Effect of Different Fiber Concentrations on the Surface Roughness of Provisional Crown and Fixed Partial Denture Resin

2008 ◽  
Vol 02 (03) ◽  
pp. 185-190 ◽  
Author(s):  
Mustafa Zortuk ◽  
Kerem Kılıc ◽  
Gulay Uzun ◽  
Ahmet Ozturk ◽  
Bulent Kesim
Keyword(s):  
Surface Roughness ◽  
Glass Fibers ◽  
Acrylic Resin ◽  
The Other ◽  
Partial Denture ◽  
Fixed Partial Denture ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
Group D

ABSTRACTObjectives: The aim of this study was to investigate surface roughness in provisional crown acrylics, after polishing, reinforced with different concentrations of glass fibers.Methods: A total of 48 disk-shaped specimens were prepared using autopolymerizing acrylic resin. These specimens were divided into four groups according to the level of glass fiber added: Group A (no fiber), Group B (0.5%), Group C (1%) and Group D (2%). After polishing the specimens, an average surface roughness (Ra) value was calculated using a profilometer from four randomly selected points on the surface.Results: A significant difference was determined among the surface roughness values of provisional crown resins to which different concentrations of fiber had been added (P<.001).Tukey�s test was then used to perform paired comparisons of the data between the different groups, and a significant difference was found between Group A (no fiber) and the other groups, between Group B (0.5%) and Group D (2%) and between Group C (1%) and Group D. On the other hand, there was no significant difference between Group B and Group C.Conclusions: The reinforcement of provisional crown and fixed partial denture resin with glass fibers increases surface roughness. (Eur J Dent 2008;2:185-190)

scholarly journals THE COMPARISON OF TWO TYPES COMPOSITE RESIN PACKABLE NANOHYBRID WITH TOTAL ETCH BONDING IN CLASS V RESTORATION MICROLEAKAGE

2021 ◽  
Vol 1 (2) ◽  
pp. 63-67
Author(s):  
Sari Dewiyani ◽  
Denissa Zahra S.
Keyword(s):  
Composite Resin ◽  
Resin Composite ◽  
Laboratory Method ◽  
Composite Resins ◽  
Test Method ◽  
Edge Density ◽  
Class V ◽  
Significant Difference ◽  
Group A ◽  
Group B

At dental clinic, there are some obstacles which occasionally may occur. A dentist runs out of the same brand of the composite resin and bonding material during tooth restoration, so they would have to be paired with material of the diffrent brand. Certain things that may occur during tooth restoration is polymerization shrinkage which forms a gap that could reducing edge density. This research is using packable nanohybrid type A composite resin and packable nanohybrid type B resin composite with total etch bonding on Class V restoration with the thin cervical section of enamel. Aim: This research is to explain the differences between two types of packable nanohybrid composite resins with total etch bonding in Class V microleakage. Methods: This research will use an experimental laboratory method with 32 maxillary premolars that have been prepared in Class V, which divided into 2 groups, group A and group B. Methylene blue will be used for the measurements, whereas the microscope will be used for the observation. Furthermore, data analysis would be conducted using the Mann Whitney U Test Method. Results: The research showed that there was a significant difference between group A and group B, which is p <0.05. Conclusion: According to this research, it can be seen that group B showed less leakage compared to group A.

scholarly journals Efficacy of the Rotary Instrument XP-Endo Finisher in the Removal of Calcium Hydroxide Intracanal Medicament in Combination with Different Irrigation Techniques: A Microtomographic Study

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2222
Author(s):  
Jameela Denna ◽  
Lubna A Shafie ◽  
Loai Alsofi ◽  
Mey Al-Habib ◽  
Emad AlShwaimi
Keyword(s):  
Test Results ◽  
Human Teeth ◽  
Passive Ultrasonic Irrigation ◽  
Root Canals ◽  
Significant Difference ◽  
Group A ◽  
Ultrasonic Irrigation ◽  
Group B ◽  
Post Hoc ◽  
Rotary Instrument

Objectives: This study aims to evaluate the efficacy of the rotary instrument XP-endo Finisher for the removal of Ca(OH)2 aided by different irrigation regimens. Methods: Sixteen double-rooted upper premolar human teeth were selected for the study. Thirty-two canals were prepared using a ProTaper Next rotary system up to X3. Then, the canals were filled with Ca(OH)2. The volume of Ca(OH)2 inside the canals was measured by microcomputed tomography (micro-CT). After that, the teeth were randomly allocated into two experimental groups, i.e., A and B (n = 16 canals). In group A, Ca(OH)2 was removed using the master apical file (X3). In group B, Ca(OH)2 was removed using a XP-endo finisher. In half of both groups (n = 8), syringe irrigation (SI) was used, while passive ultrasonic irrigation (PUI) was used for the other half. After removal, the remaining volume of Ca(OH)2 was measured. All data were statistically analyzed using two-way ANOVA with Tukey’s post hoc test. Results: The percentages of remaining Ca(OH)2 in the apical thirds of all canals were significantly higher as compared with the middle and coronal thirds in all groups (p < 0.05). There was no significant difference between different files and techniques (p > 0.05). Clinical Significance: This study presents a new method for the removal of Ca(OH)2 from root canals.

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