05 Feb 2023
31 Jan 2023
This research aimed to study the effect of the type of provisional compensation material and polishing material on the color stability of compensation provisional to determine which temporary compensation and polishing materials studied are best and have the greatest color stability. The research sample consisted of 40 provisional crowns designed for an upper premolar that was prepared to receive a full ceramic crown, where the sample was divided after obtaining it into two main groups according to the type of compensation used (Bis-acryl by direct method and PMMA by indirect method by CAD/CAM technology), then each group of the study sample was divided into two groups according to the type of polishing material used (aluminum oxide paste or diamond paste), then the colorimetric measurements of the research sample were carried out using a spectrophotometer (VITA Easyshade V, Germani) The crowns were then immersed in a solution of coffee and distilled water and stored in an incubator at (37+-1)C for 7 days. Then the colorimetric measurements were re-performed and the amount of color change ΔE was calculated for each of the research samples. The data were analyzed using one-sided analysis of variance (ANOVA) and two-way comparison test using the method of least significant differences (LSD). At the confidence level of 95%, there are statistically significant differences in color stability in the average amount of change ∆ E between Bis acryl crowns and PMMA crowns, there were no statistically significant differences between aluminum oxide and diamond in the chromatic stability of the studied temporary compensation. Within the limitations of this study, we conclude Samples that contain PMMA which manufactured by CAD/CAM method showed stability chromatically greater than samples that enter into the composition of Bis-acryl which manufactured by the direct method, and there was no difference between the effect of each of the two materials aluminum oxide And diamond in the chromatic stability of the temporary compensation material, and the type of temporary compensation material had the greatest effect In the color change ∆E of the studied sample compared to the type of polishing substance used.
Comparison of the corrosion rate of nickel-titanium and copper nickel-titanium archwires in artificial saliva and after its exposure to the oral environment. 48 distal ends of nickel-titanium archwires and 48 distal ends of copper nickel-titanium archwires were divided into two equal groups: the first was left unused, the second group was exposed to the oral environment of 12 volunteers for 3 weeks. Then, an electronic corrosion velocity locator, Model 1359 from ACM Instruments, was used to analyze the electrochemical corrosion velocity of the studied samples. The study showed that there is no significant difference in the velocity of electrochemical corrosion between the two types of archwires studied with respect to the round archwires; While there was a significant difference in the velocity of electrochemical corrosion between the two types in rectangular archwires, in the upper rectangular wires the corrosion of copper nickel-titanium archwires was greater than that of the nickel-titanium archwires, and in contrast to the lower rectangular wires where the corrosion velocity of the nickel-titanium archwires was greater and difference was significant in comparison to nickel titanium copper archwires. Both types of the studied archwires were affected by the oral environment, as they showed a decreasing in the velocity of electrochemical corrosion.
Dental biofilm considered as the primary etiology for periodontal diseases and its early colonizers are of great importance in the succession stages of biofilm formation such as Streptococcus oralis. Nowadays there is a need to find natural substances from plants with antibacterial activity as an alternative to Chlorohexidine. To determine in vitro antibacterial effects of alcoholic Commiphora Myrrha and Ziziphus spina-christi leaves extracts alone and in Combination against Streptococcus oralis. Supragingival dental plaque samples were taken from 15 subject with dental plaque induced gingivitis then morphological, microscopical examination, biochemical tests and Vitek 2 were used to confirm identification of Streptococcus oralis. The Commiphora Myrrha and Ziziphus spina-christi leaves extracted by using ethanol alcohol. The susceptibility of bacteria against the extracts, the minimum bactericidal concentration and the minimum inhibitory concentration were determined separately and in Combination compared with chlorhexidine gluconate 0.2% and deionized water. Commiphora Myrrha and Ziziphus spina-christi leaves ethanol extracts had considerable antibacterial effects against Streptococcus oralis with various degrees of growth inhibition zones. It was shown that Combination extracts was the most effective compared to Chlorohexidine then Myrrha and lastly Ziziphus leaves extracts. The minimum inhibitory concentrations of the extracts ranged from (0.2-0.6 g/ml). The minimum bactericidal concentration of alcoholic extracts ranged from (0.4- 0.8 g/ml). The antibacterial activity of Alcoholic combination extracts was the highest antibacterial activity with all concentration against Streptococcus oralis than Myrrha and Ziziphus leaves extracts were even higher than Chlorohexidine when used at higher concentration, so it can be used as an alternative to Chlorohexidine.
One of the largest obstacles for plastic surgeons is performing mastopexy on patients with small and medium-sized ptotic breasts since mastopexy has opposing effects on the breast surface and parenchyma in these individuals. These operations are intended to enhance projection, lessen breast ptosis, and make the patient look younger. To assess a group of patients having circumareolar breast augmentation mastopexy using implants and imaging techniques to treat ptosis in volume-depleted breasts in order to achieve a more youthful appearance, enhanced projection, and decreased ptosis of the breast. This prospective study using one stage breast augmentation with mastopexy technique via circumareolar approach, was carried out in 30 middle-aged female patients at Kasr al Ainy hospitals in Cairo and Beni-Suef university hospitals in Egypt who had second- and third-degree ptosis or hypomastia. Depending on whether or not they wanted to use breast implants to increase breast volume, the patients were split into two groups. Standard breast measures, early and late problems, patient satisfaction, and results were all recorded. Over a four-year period, a total of 30 patients (60 breasts) had one stage mastopexy with circumareolar technique. Preoperative testing showed that grade 3 ptosis and grade 2 ptosis, respectively, were present in 5 patients (16.66%) and 25 of 30 patients, respectively. Asymmetry in the breasts of six of our patients led to a difference in implant volume from side to side. Following surgery, according to age, implant design, NAC lift, and asymmetry, 25 of the patients (or 84%) who underwent follow-up showed good results, 3 (or 10%) showed good results, and 2 (or 6%) showed unsatisfactory results. Particularly in grade 2 ptosis where nipple elevation is 5 cm or less, circumareolar augmentation mastopexy is highly beneficial in generating an acceptable aesthetic breast form. However, grade 3 ptosis with NAC elevation larger than 5 cm is more likely to have NAC expansion.
Early diagnosis of acute coronary syndrome (ACS) is crucial, owing to the high mortality rate associated with it. Failure in diagnosis of ACS is a concern for both the patients and the clinicians. Ischemia modified albumin (IMA) has been proposed as a useful marker for the diagnosis of acute coronary syndrome (ACS) in the emergency department (ED). This study assessed the utility of IMA in early diagnosis of ACS in patients with acute chest pain, and evaluated its diagnostic performance compared to creatine kinase-MB (CK-MB) and electrocardiogram (ECG). The study included 127 patients presenting to the ED within three hours of acute chest pain. Depending on the final diagnosis, patients were classified into acute myocardial infarction group (n=45), unstable angina group (n=52) and non-ischemic chest pain group (NICP) (n=30). Ischemia modified albumin value was significantly higher in ACS patients compared to NICP. According to ROC curve, the optimal cutoff of IMA was 71.3 u/ml, which had a sensitivity and specificity of 86.5% and 76.7% respectively. The sensitivity of IMA assay (86.5%) was significantly higher compared to ECG (54.6%), and CK-MB (11.3%). IMA used together with CK-MB or ECG, increased their own sensitivity to reach 88.7% and 90.7% respectively. All three tests combined identified 95.9% of patients whose chest pain was attributable to ACS. Our findings revealed that IMA is a sensitive marker for early detection of ACS in patients presenting with symptoms of acute chest pain.