04 Dec 2023
30 Nov 2023
Determining the effect of the type of preparation system on the volume of coronally-regressed smear layer. The research sample consisted of 22 newly extracted teeth, single-rooted and with a single canal, their lengths have been standardized to be 16 mm from the apex, then randomly divided into 2 equal groups (11 teeth for each group) according to the preparation system adopted as follows: (Group I: Reciproc blue) (Group II: ProTaper Gold), the apex was sealed with red baseplate wax, and fixed with a mixture of acryl, sawdust and gypsum in a plastic mold until completely solidified. 1 ml of distilled water has been used for irrigation during preparation with the use of U File for Irrigation activation after each preparation and the entire product of the preparation process has been collected into the sample tubes. Spectrophotometer has been used to calculate the volume of the smear layer. Results were analyzed using Student (T) test for independent samples. The results showed that the two systems produced the same volume of smear layer during preparation. The results showed that the two systems produced the same volume of smear layer during preparation.
Creating long-lasting restorations severely damaged anterior primary teeth has been a challenging task for pediatric dentists. Many studies have been accomplished to determine how successful the mentioned treatment methods are, but the results of those studies verified between each other. This study aims to evaluate the fracture resistance three posts used in primary anterior teeth; which are short composite posts, metal ringed posts, and fiber-reinforced composite ringed posts. A total of forty five anterior teeth, with no fractures, no internal absorption and external absorption no more than third of the root, have been endodontically treated. They were randomly divided into three groups; Group A was restored using a short composite post, group B and C were treated using metal and glass fiber customized ringed posts in the same order. Fracture resistance has been evaluated using Testometric device and fracture mode was determined. The fracture forces were recorded. One-way ANOVA and was applied to compare means of recorded fracture forces. Significant differences were found among groups p=0.000. Post hoc test showed that the fiber ringed posts showed significantly higher fracture resistance than the other two groups. Chi-square test showed that in both ringed posts there were significant difference in fracture mode, but in composite posts there was not. Fiber ringed posts showed the highest fracture resistance than both metal and composite posts.
Bonding fiber-reinforced resin posts with resin cement is a potential factor in contributing to the failure of these posts. Several methods have been proposed to treat the post surface to increase bonding strength: our results have proven controversial. This study aimed at evaluating the effects of three methods for treating the surface of a fiber post on its bond strength with resin cement. Forty-eight glass fiber posts were utilized and divided into three 16-specimened groups based on the surface treatment the participants received: G1 treated via implementing etching with hydrogen peroxide 10% and silanization, G2 with hydrofluoric acid 10% and silanization, and G3 by ethyl alcohol 70% that was the control group. The posts were cemented with dual-cured resin cement and were stored in distilled water at 37° Celsius for 24h. Then, the samples were subjected to tensile test by the general mechanical testing device, the testometric device. The bond strength in each sample of posts was recorded in newtons (N). Our data were analyzed using both the ANOVA and Bonferroni tests. The statistical study revealed that the mean values of bond strength were 400.08 ± 87.37 N, 396.26 ± 91.44 N, 304.65 ± 86.26 N, in the three groups respectively. A statistically significant difference was detected in bond strengths between the two test groups: on the one hand, the experimental G1 and G2 treated through etching with hydrogen peroxide or with hydrofluoric acid; on the other hand, the control G3 treated using ethyl alcohol. The p-value noticed in our research reached < 0.005. Hydrogen peroxide and hydrofluoric acid were found to contribute to increasing bond strength of fiber-reinforced resin posts used in this study with resin cement.
Pregnant women are considered to be more susceptible to severe COVID-19 respiratory infections due to physiological and anatomical changes. In addition to its impact on cardiac and pulmonary physiology, pregnancy is also characterized by several changes in the immunological profile or biomarkers. Changes in levels of biomarkers such as C-reactive protein (CRP), lactate dehydrogenase (LDH), ferritin, and D-dimer have been considered as tools to monitor the severity of COVID-19 infection. This study was conducted to explore the specific role of CRP and D-dimer in COVID-19 pregnant patients. This research is an observational analytical study. The number of research samples was 40 samples consisting of 20 pregnant women with mild COVID-19 symptoms and 20 pregnant women with moderate-severe COVID-19 symptoms who were treated at the obstetric emergency care unit (IRDO) Prof. RSUP. Dr. RD Kandou Manado in August 2021. The data were then analyzed using SPSS 25 software for Windows. In the group of pregnant women with mild COVID-19 symptoms, the mean±SD value of CRP levels was 25.69±3.155 and D-Dimer levels were 2.6956±0.42413; while in the group of pregnant women with moderate to severe symptoms of COVID-19, the mean ± SD value of CRP levels was 42.57 ± 2.615 and D-Dimer levels were 12.3481 ± 1.86270. So from this study it was found that maternal CRP and D-Dimer levels were on average lower in pregnant women with mild COVID-19 symptoms than moderate-severe symptoms. There is a significant relationship between maternal serum CRP levels (p=0.001) and maternal serum D-Dimer levels (p=0.000) against Covid-19 pregnant women with mild and moderate-severe symptoms.
Myrtus communis is considered as one of the major medicinal plants Iraqi abundant widely in plant Kingdom. The current study was established to isolate the phenols from the leaves of this plant and extraction percentages were calculated. Qualitative tests were applied for cold aqueous, cold ethanolic and phenolic extracts for Myrtus communis. The concentrations of phenols which were represented by 50,100,125 and 150 gm/ml recorded inhibition zone diameters equal to 20,20,21 and 22 mm respectively against growth Escherichia coli while the same concentrations values showed inhibition zone diameters were 20,22,23 and 25 mm respectively against Staphylococcus aureus. The concentrations prepared from the phenols showed a very good biochemical and medicinal ability to inhibit the biological and chemical system of these pathogenic bacteria, so the phenolic compounds of Myrtus communis can be applied for treatment of infections and inflammatory caused by these pathogens instead of the synthetic drugs having multi-side effects.