Shear Bond Strength of Self-etching Adhesive Systems with Different pH Values to Bleached and/or CPP-ACP-treated Enamel

Purpose: To compare shear bond strengths of three different self-etching adhesive systems of different pH values to enamel bleached with carbamide peroxide, treated with casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), or treated with CPP-ACP subsequent to bleaching with carbamide peroxide. Materials and Methods: Thirty-six human third molars were cut into 4 sections and randomly assigned to 4 groups (n = 36): group I: no treatment; group II: bleaching; group III: CPP-ACP; group IV: bleaching and CPP-ACP. After surface treatments, the samples of each group were further divided into three subgroups (n = 12) based on the adhesive used. The adhesives Clearfil SE Bond (CSE), AdhesE (ADE), and Adper SE Plus (ADP) were applied, and resin composite cylinders with a diameter of 2 mm and a height of 4 mm were bonded to the enamel. Then the specimens were subjected to shear bond strength testing. Two-way ANOVA and a post-hoc Tukey's test were used for statistical analysis (α = 0.05). Results: There were significant differences between the adhesive systems (p < 0.001) and surface treatments (p < 0.001), but no significant interactions were observed between these variables (p = 0.78). The CSE adhesive system showed the highest bond strength, and the bleaching procedure reduced bond strengths (p = 0.001). Furthermore, there were no significant differences in shear bond strength values between the control and CPP groups. However, the differences between other groups were statistically significant (p < 0.05). Conclusion: Bleaching reduced shear bond strength to enamel, but CPP-ACP application did not affect the bond strength to intact and previously bleached enamel. The bond strength of adhesives with different pH values to enamel was material dependant.     

Detection of vertical root fractures using digitally enhanced images: reverse‐contrast and colorization

Abstract – Root fracture diagnosis is a clinical difficulty that in most cases can only be detected through radiography. The objective of this study was to compare the diagnostic accuracy of two types of digitally enhanced images (reverse‐contrast and colorization) with original digital radiographies in detecting experimental root fractures. Two hundred extracted single‐rooted human teeth were endodontically instrumented and then divided in two groups, one control group and one test group, including fractured teeth. Vertical root fractures were experimentally made in the fractured group. The digital image of each tooth was taken, using the paralleling technique. There were three groups of images: (i) original, (ii) reverse contrast, and (iii) colorized. Three experienced dental specialists examined the images with no prior knowledge of the distribution of the root fractures. Two‐way analysis of variance was used to assess the differences in accuracy, sensitivity, and specificity of each technique in detecting root fractures. Cohen’s kappa coefficients were calculated to investigate the degree of interobserver agreement. The accuracy, sensitivity, and specificity of original images were 67.4%, 66.7%, and 68%, respectively; these amounts were 61.5%, 61%, and 65.5% in reverse contrast images and 66.4%, 70.7%, and 62% in colorized digital radiography. The original images had the best inter observer kappa coefficients (between 0.45 and 0.55). The results showed that the accuracy of original images is better than reverse contrast and colorized images. Use of reverse‐contrast and colorization digital images in root fracture detection should be regarded as an adjunct to other diagnostic methods not as a highly critical diagnostic aid.     

Prooxidant-Antioxidant Balance and Antioxidized LDL Antibody Level Values and Cardiac Function in Patients with Coronary Artery Disease

Objectives: We studied the association between the prooxidant-antioxidant balance (PAB), anti-malondialdehyde-modified low-density lipoprotein (oxidized LDL, ox-LDL) IgG antibody and indices of cardiac function (systolic and diastolic function) in patients with coronary artery disease (CAD). Methods: Fifty-five patients with established CAD were selected, and serum levels of anti-ox-LDL IgG and PAB values were measured and compared with 40 matched healthy controls. Systolic and diastolic functions were determined for all patients. Results: PAB values were significantly higher in patients than in controls (p < 0.001), whilst serum anti-ox-LDL concentrations were not statistically different between the 2 groups (p = 0.821). However, after adjustment for high-density lipoprotein cholesterol, the patients had higher anti-ox-LDL levels (p = 0.04). Total PAB values were inversely associated with ejection fraction (r = -0.326, p = 0.031), but this was not the case for anti-ox-LDL in either group (p > 0.05). Conclusion: Serum concentrations of a marker of oxidative stress (PAB values) are inversely associated with cardiac function. PAB is a relatively simple index that could be incorporated into risk assessment in CAD patients. Anti-ox-LDL IgG antibody concentration does not appear to reflect total oxidative stress as assessed by PAB.     

Protective effects of copper against aluminum toxicity on acetylcholinesterase and catecholamine contents of different regions of rat’s brain

The probable protective effects of copper on the acetylcholinesterase activity and the catecholamine levels in cerebellum, cortex and mid-brain of rat, which was intoxicated by aluminum, were studied during short and long terms. In this respect, male Wistar rats weighing 200–250 g were received daily intraperitoneal doses of aluminum, copper and also combined doses of both metals for 15 days (Al 10 mg kg^?1 BW and Cu 1 mg kg^?1 BW), 30 days (Al 5 mg kg^?1 BW and Cu 0.5 mg kg^?1 BW) and 60 days (Al 1 mg kg^?1 BW and Cu 0.1 mg kg^?1 BW), respectively. The results obtained from the short period of exposure (15 days) showed that aluminum produced significant (P < 0.05) decreases in the acetylcholinesterase activity by 24.14, 23.30 and 25.81 %. Similarly, the catecholamine levels were reduced by 10.69, 12.25 and 12.64 % in cerebellum, cortex and mid-brain, respectively. Treatment with copper increases both acetylcholinesterase activity and catecholamine contents of cerebellum, cortex and mid-brain. Simultaneous injection of copper and aluminum increased both acetylcholinesterase activity and catecholamine contents in all three parts of rat brain when compared to aluminum-treated group. Same results were also observed following 30 and 60 days of exposures. In overall, it has been found that copper may have a protective-like ability to hinder aluminum toxicity in the brain.     

Histopathological changes of gastric mucosa following oral administration of fumonisin B1 in mice

Fumonisin B1 is a common secondary metabolite produced by Fusarium moniliforme that occurs in corn and corn-based foods. This mycotoxin is toxic to many species of laboratory and domestic animals and is known to induce a variety of diseases such as hepatic cancer and renal and hepatic dysfunction. The structure of fumonisin B1 (FB1) resembles sphingolipids so it can inhibit synthesis of ceramide, an enzyme in the sphingolipid biosynthetic pathway. This inhibition leads to the disruption of sphingolipid metabolism and increased levels of sphinganine and sphingosine (sphingoid bases) in the serum of treated animals. It is believed that the toxicity effect of fumonisin B1 is the result of these sphingoid bases. In the present research, mice were treated with FB1 to determine its pathological effects on gastric gland and gastric mucosa in the treated mice. For this purpose, the mice were randomly assigned into two groups, namely, control (n?=?14) and treatment (n?=?15). The treatment group was fed with prepared food containing FB1 (150 mg/kg) for a period of 4 months. One day after the last treatment, all animals in both groups were euthanized and their stomach were sampled and prepared for microscopic analysis. Histopathological analysis revealed a significant decrease in parietal cell number and a significant increase in the number of inflammatory cells in gastric mucosa. Also, atrophy of gastric glands was observed. The study confirmed that FB1 poisoning can have toxicopathological effects such as gastric gland atrophy and gastritis on mice gastric tissue.     

Evaluation of the effect of static magnetic field in treatment of tendon injuries in dog

To assess the effect of magnetic field in experimental tendon injuries, ten clinically healthy adult indigenous dogs were divided into two equal groups (control and experimental). The left superficial digital flexor tendon was exposed and three windows of 6 mm thickness, 3 mm length, and 2 mm intervals were made under general anesthesia. In the experimental group, the dogs were subjected to a magnetic field of 6?×?800 G for 30 days. The tendon biopsy was collected from the site of operation on the postoperative day 30. Histomorphological changes indicated low rate of inflammatory cells, high rate of mature fibroblast, and increased normal collagen fibers, and these were better in the experimental group. The biomechanical test revealed that the tendons of the dogs in the experimental group were more resistant than tendons of the dogs in the control group. The result of this study indicated that magnetic field therapy reduced edema and local swelling, enhanced proliferation of fibroblasts, and regulated arrangement of collagen fibers, providing a good noninvasive physical therapy for tendinous injuries.     

Effect of pegylated interferon-α-2a treatment on mental health during recent hepatitis C virus infection

Background and Aim: Pegylated interferon (PEG‐IFN) treatment for hepatitis C virus (HCV) infection has neuropsychiatric side effects. Data on the effect of HCV treatment on mental health among injecting drug users (IDUs) are limited. We assessed mental health during treatment of recently acquired HCV, within a predominantly IDU population. Methods: Participants with HCV received PEG‐IFN‐α‐2a (180 µg/week) for 24 weeks; HCV/HIV received PEG‐IFN with ribavirin. Depression was assessed using the Mini‐International Neuropsychiatric Interview (MINI). Logistic regression was used to identify factors associated with depression at enrolment and during treatment. Also, the effect of depression prior to and during treatment on sustained virological response (SVR) was assessed. Results: Of 163 participants, 111 received treatment (HCV, n = 74; HCV/HIV, n = 37), with 76% ever reporting IDU. At enrolment, 16% had depression (n = 25). In adjusted analysis, depression at enrolment occurred less often in participants full‐/part‐time employed (adjusted odds ratio [AOR] 0.23; 95% confidence interval [CI]: 0.06, 0.82, P = 0.023) and more often in recent IDUs (AOR 3.04; 95% CI: 1.19, 7.72, P = 0.019). During treatment, 35% (n = 31) developed new‐onset depression. In adjusted analysis, poorer social functioning (higher score) was associated with new‐onset depression (score ≤ 9 vs score ≥ 17; OR 5.69; 95% CI: 1.61, 20.14, P = 0.007). SVR was similar among participants with and without depression at enrolment (60% vs 61%, P = 0.951) and in those with and without new‐onset depression (74% vs 63%, P = 0.293). Conclusions: Although depression at enrolment and during treatment was common among participants with recent HCV, neither influenced SVR. Participants with poor social functioning may be most at risk of developing depression during HCV therapy.