Introduction: Usually osseointegration takes between three to six months after implant placement but patients are interested to have early loading. There are no definitive criteria for measuring bone mineral density (BMD), insertion torque (IT) (final torque force) and resonance FREQUENCY analysis (RFA) (primary implant stability) to determine exact loading time based on the relationship between the above-mentioned parameters. The aim of this study was to determine the relationship between IT, RFA and BMD in screw-type implants.Materials and Methods: This clinical trial was conducted on 18 patients who were candidates for ITI implant placement. Written consent was taken and jaw bone density was determined via a digital radiography technique before surgery. After implant placement, RFA and IT were measured. Fifty-five ITI implants of the total 62 implants placed were evaluated; the implants were 12 mm long with a diameter of 4.1 mm. Data was analyzed with Pearson’s test using SPSS.15 software (a=0.05).Results: There was a significant relationship between IT, RFA and BMD. Pearson’s test showed a correlation coefficient of 0.872 to 0.789 between the three parameters, indicating a strong relationship between them. The mean bone density was 1.468±0.042 g/cm2; the mean RFA was 66.01±2.2 ISQ and the mean IT was 34.62±3.33 N/cm2.Conclusion: Based on the results of the present study there is a significant relationship between, IT, RFA and BMD (p value=0.001).

Background: Tympanometry is one of the most important audio logical tests for the assessment of neonatal hearing screening programs. This test is usually done using a 226 Hertz probe tone; however, in infants less than 6 months of age, using this probe tone FREQUENCY is not reliable due to the different characteristics of the middle ear compared to adults. The purpose of this study was to assess the obtained tympanometric data in neonates 1 to 14 days with normal hearing using 226, 678, 800 and 1000 Hertz FREQUENCY probes tones.Materials and Methods: In this cross-sectional study, 30 neonates aged 1 to 14 days who were diagnosed as normal in hearing aspect with using otoacoustic emissions test, were assessed by tympanometry. Tympanometric tests were performed using 226, 678, 800 and 1000 Hertz FREQUENCY probe tones for both ears. For data analysis, the T-paired method has been used.Results: With using 226 Hertz FREQUENCY probe tone, incidence of unusual double peak tympanograms was observed in 65% of cases, which with increasing FREQUENCY of the probe tone, this percentage was decreased. There was also a statistically significant difference between the static admittance peak compensated in two 226 and 1000 Hertz FREQUENCY probes tones.Conclusion: In neonates with normal hearing and without any risk factors for hearing loss, the 1000-Hertz Tympanogram shows a better middle ear status than the 226-Hertz tympanogram.

Background: Systemic sclerosis is an autoimmune connective tissue disorder which is characterised by cutaneous and internal organ fibrosis. Raynaud’s phenomenon is the earliest feature and may precede the onset of the disease by months to years. The heart, lungs, gastrointestinal tract, kidneys and other organs may be involved. Our aim was to evaluate skin thickness and echogenicity in systemic sclerosis patients by ultrasound and compare it with the healthy age and sex matched controls.Method: Our study included 15 successively admitted patients (14 females and 1 male) with systemic sclerosis and 15 healthy age and sex matched controls. All the patients met the ACR criteria of diagnosis. The age range of the patients was 25-55 years. The disease duration ranged from 1-8 years. A complete history and physical examination was done for each patient. Skin thickness and echogenicity were measured by a 20MHz ultrasound probe at 6 different anatomical sites which was compared with that of the controls.Result: Skin thickness was more in systemic sclerosis patients (significant p value) as compared to controls, and echogenicity was inversely proportional to the skin thickness.Conclusion: Skin ultrasonography is a noninvasive method which can reflect the severity of skin involvement and periodic assessment of skin thickness and echogenicity can help to monitor the progression of the disease.

Background and Aim: HIGH FREQUENCY audiometry (HFA) provides a valuable tool and optimal index for distinguishing and monitoring many pathologies of the ear. The purpose of this study was to measure the reliability of HFA threshold in children.Materials and Methods: In this cross-sectional study, 100 normal-hearing children, of 7 to 13 years old, including 50 boys and 50 girls were examined with a Belton 2000 audiometer and Sennheiser HD 250 earphones in Pediatric Clinic of Audiology Department, Faculty of Rehabilitation of Tehran University of Medical Sciences.Results: The threshold differences between right and left ears in two test sessions, were not significantly different except for 14KHz. HFA threshold in two test sessions showed no significant difference in all frequencies between girls and boys but 16 and 20 KHz in right ear and 10 KHz in left ear.Conclusion: The test-retest thresholds for iudividual ears showed± 0-10 dB SPL for difference at least in 99.74 % of ears at all frequencies that is clinically reliable and acceptable.

Background: Acinetobacter is a gram-negative no fermentative coccobacilli with increasing prevalence in a variety of hospital-acquired infections. The aim of this study was todetermine the FREQUENCY of extended spectrum b-lactamase (ESBL) and metallo-b-lactamase (MBL) in Acinetobacter isolated from clinical specimens.Methods: 100 isolates of Acinetobacter were collected from different clinical samples including lood, wound, and liquid specimens of hospitalized patients of Imam Reza and Taleghani hospitals in Kermanshah. All isolates were identified by standard biochemical tests. ESBL and MBL producing strains were identified by phenotypic method of combined- disk ceftazidime/clavulanic acid and imipenem/EDTA.Results: Among 100 Acinetobacter isolates 58 (58%) were resistant to imipenem and 94 (94%) were resistant to ceftazidime. In total, 10% of isolates were ESBL-positive and 72% of them were positive for MBL. Conclusion: The result shows MBL producing Acinetobacter is more prevalent in Kermanshah compared to other cities. However the carbapenems is one the excellent treatments against infections caused by multidrug-resistant Acinetobacter, but HIGH prevalence of MBL and ESBL producing Acinetobacter dramatically reduces the existing therapeutic options and poses a potential threat to public health.

In today's world, capital markets have increased the possibility to generate profits through HIGH-FREQUENCY transactions due to the advancement of computer technology and the use of IT infrastructure. The main objective of this research is to examine and provide a model of paired trading algorithms that can generate HIGHer returns than coherent algorithms. In the background study, one of the limitations of the paired trading algorithm is the use of constant limits and rules that cannot model the dynamics of the system. This research based on the purpose is applied research and in terms of collecting data in the form of descriptive research with the approach of presenting a model. In order to test the model, using the data of 1395, intraday stock prices was used. The statistical population of this study was the top 50 Tehran Stock Exchange companies, using filtering the stocks to create a pair of shares decreased to 33, these shares was selected as sample. The results of the study were presented by implementing two algorithms of paired trading algorithms and paired trading algorithms statistical process fuzzy control. Finally, the results showed that the modified algorithm during the similar period of the investment could produce 57. 95% of the return, while the base model had 46. 17% returns on investment.