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مرکز اطلاعات علمی SID1
اسکوپوس
دانشگاه غیر انتفاعی مهر اروند
ریسرچگیت
strs
Issue Info: 
  • Year: 

    2008
  • Volume: 

    26
  • Issue: 

    3 (77)
  • Pages: 

    239-246
Measures: 
  • Citations: 

    0
  • Views: 

    716
  • Downloads: 

    170
Abstract: 

Background and Aim: The prevalence of CI II malocclusion is high in the population. The functional appliances are used in the patient who has mandibular deficiency. The present study was aimed to compare the dentoskeletal changes of CLII/I Malocclusion who used inclined anterior bite plan and MODIFIED FRII.Materials & Methods: The material consisted of 30 patients, with CI IIII malocclusion, ANB>4o in late mixed dentition. Half of the patients (9 girls and 6 boys) were treated by inclined anterior bite plane and reminder (8 girls and 7 boys) by MODIFIED FRII appliance. Lateral cephalogroms were obtained and traced before and after treatment and certain angular and linear variables were measured. The pretreatment and post-treatment measurements were compared using Mann-whitney U test and Wilcoxon Test to evaluate the significancy of the results.Results: Significant changes mainly caused by mandibular growth, were observed after treatment by MODIFIED FRII and inclined anterior bite plane. This study indicated no statistical significant differences between two groups except Ar-B and AR-Pog.Conclusion: Considering the less bulky anterior inclined bite plane and its easier construction we can use this appliance instead of MODIFIED FRII.

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Issue Info: 
  • Year: 

    2018
  • Volume: 

    31
  • Issue: 

    1
  • Pages: 

    34-41
Measures: 
  • Citations: 

    0
  • Views: 

    366
  • Downloads: 

    171
Abstract: 

Background and Aims: In 1978 WHO (World health organization) formulated a histopathological definition for diagnosis of OLP (oral lichen planus). Previous studies showed that diagnosis of OLP with these criteria are not reproducible. In 2003 Van der Meij et al. represented new clinical and histopathologic definition for diagnosis of OLP known as MODIFIED WHO criteria. The purpose of this study was to evaluate the interobserver and intraobserver variability in the histopathological assessment of OLP based on the MODIFIED WHO criteria. Materials and Methods: Fifty five microscopic slides which OLP and OLL (Oral Lichenoid Lesion) were recognized in their clinical differential diagnosis were given to 6 pathologists in two phases with 3 months interval. Each reviewing pathologist was asked to apply the MODIFIED WHO definition of OLP and to categorize each case as either OLP, or compatible with OLP. Then, the interobserver and intraobserver variability were assessed by calculation of repeatability coefficient and Kappa statistics. Results: The results of this study demonstrated that interobserver variability based on MODIFIED WHO criteria was 0. 77 (strong), while the intraobserver variability varied from 0. 58 (moderate) to 0. 82 (strong). Conclusion: In the present study, the interobserver and intraobserver variability in the histopathologic assessment of OLP based on MODIFIED WHO criteria was stronger than previous studies which assessed WHO criteria. However, in order to propose the replacement of WHO criteria with MODIFIED WHO criteria, further studies with more cases and comparing the two methods is required.

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Author(s): 

MAHDAVI R. | TAVASOLI F.

Issue Info: 
  • Year: 

    2001
  • Volume: 

    3
  • Issue: 

    5-6
  • Pages: 

    15-20
Measures: 
  • Citations: 

    0
  • Views: 

    757
  • Downloads: 

    178
Abstract: 

Introduction: Several methods are used for the treatment of stress urinary incontinence (SUI); and their early results are relatively similar, but late outcomes are different. We represent our results by the MODIFIED Burch Procedures (Tanagho) in the treatment of SUI for a 12 year follow up perios.Methods: From 1988 to 2000, 52 females with SUI 65% of whom had a history of anterior colporhaphy were operated with MODIFIED Burch urethropexy. Then early and late results were evaluated in 31 of these cases.Results: Results indicated that urinary retention in 3 cases (10%), difficulty in voiding in the first week after operation in 4 cases (12%), complete response was 93.5% in, one year's follow-up, 89.4% in 3 year's follow-up and 75% in 5 and 15 year's follow-up were observed.Conclusion: MODIFIED Burch for the treatment of SUI is a very easy and safe technique and has clear advantages in patients with a history of anterior colporhaphy or patients with moderate cystocele.

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گارگاه ها آموزشی
Issue Info: 
  • Year: 

    2011
  • Volume: 

    7
  • Issue: 

    3
  • Pages: 

    288-293
Measures: 
  • Citations: 

    0
  • Views: 

    917
  • Downloads: 

    249
Abstract: 

Introduction: In most cases after periodontal surgery, the surgical area is covered with surgical packs. Recent studies suggest that use of periodontal packs after periodontal flap surgery is not necessary and some patients may be irritated by them. The aim of this study was to determine microbiological contamination of a periodontal pack (Coe-pak) by determining microbial colony counts of surgical sutures after MODIFIED Widman flap surgery.Materials and Methods: In this clinical trial, thirty-two patients needing periodontal surgeries at least in two quadrants of jaws were selected. In one quadrant, after surgery the surgical area was covered with periodontal pack randomly and the other quadrant was left without any dressing. After a week the sutures were removed and microbiological colony counts were determined. Finally microbial colony counts in the two groups were compared between the two groups by paired sample test using SPSS software (a=0.05).Results: The mean colony counts with and without periodontal pack were 10187±2900 and 9812±3042, respectively, with no statistically significant differences between the two groups (p value=0.602).Conclusion: The results of this research showed that sutures have microbial contamination with or without use of periodontal packs and these materials have no effect on microbial contamination.

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Author(s): 

TAHERI K. | LAFZI A.

Issue Info: 
  • Year: 

    2000
  • Volume: 

    18
  • Issue: 

    3
  • Pages: 

    285-291
Measures: 
  • Citations: 

    0
  • Views: 

    924
  • Downloads: 

    129
Abstract: 

This research was carried out on 48 patients aged from 12 to 67 who refered to Oral Surgery Department at Tabriz Dental school for their teeth extraction.Patients were divided into 4 groups as follow:Group A1: Patients with teeth on both sides of lower jaw to be extracted. One side, was adopted as Experimental while the other side was considered as control (Inferior alveolar nerve block anesthesia or mental nerve block anesthesia).Group A2 Patients with teeth on both sides of lower jaw to be extracted, with the difference that only on one side Mod I.O.A was adopted with no injection of any kind on the other side. Group B: Patients with teeth only on one side of the lower jaw to be extracted, in which Mod I.O.A was employed.Group C: Patients, in whom inferior alveolar nerve block anesthesia was failed and then Mod I.O.A was adopted for Extractions.To perform this technique, a manual terphinator was designed. Use of this device removes the need for incision of mucosa and the bone at the apex of the tooth. This is because, these tissues will be perforated. rated during the technique, with an access to spongeous bone.Results showed, the effect of the anesthetic solution in this technique is rapid, short and limited. In addition there is no relationship between the degree of anesthesia with age, sex or the kind of tooth to be extracted. In spite of the passage of the anesthetic solution from the midline, it's distribution through the bone differs among the different people.

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Author(s): 

MOHAMMADI M.

Issue Info: 
  • Year: 

    2004
  • Volume: 

    17
  • Issue: 

    2 (39)
  • Pages: 

    26-38
Measures: 
  • Citations: 

    1
  • Views: 

    1631
  • Downloads: 

    393
Abstract: 

Statement of Problem: There are different tooth brushing methods for removing dental plaque from tooth surfaces. The effectiveness of these methods, and the time needed for instruction, learning and using seem to be different. Also, it is possible that the effectiveness of each method reduces with time, based on its difficulty level and the reduction of the patient s attention in following the given instructions. Purpose: The aim of this research was to compare the effectiveness of six different accepted tooth brushing methods on total and specific teeth, as well as on special tooth surfaces. The research also compared the time needed for instruction, learning and using the methods. Materials and Methods: The study was designed as a single blind randomised controlled trial protocol to compare the six accepted tooth brushing methods: Roll, Bass, Charters' (C), MODIFIED Stillman (MS), and MODIFIED Bass in two ways (MB1-MB2). 15 volunteers were selected from the basic science level dental students at Tehran University of Medical Sciences. All the six methods were instructed to each volunteer, using a randomly selected sequence. Each participant should, therefore, pass six consequent courses, by the same sequences as follow: 1st Visit: After polishing the teeth, the participant was asked to abstain any kind of tooth cleaning. - 2nd visit (48-72 hours later): O'Leary Plaque Index (PI) was recorded and then the randomised selected method was instructed. Then, the participant brushed his/her teeth and PI was registered again. The time needed for instruction and using the method was registered too. The participant was then asked to use this newly learned tooth brushing method twice a day for 7±1 days. - 3rd visit (7±1 days later): PI was recorded. The teeth were polished. The participant was asked to abstain any kind of tooth cleaning for 48-72 hours, as washout period of the previous method and preparation period for the next method (2nd visit of the next course). The final stage was comparing the results, in which the effectiveness of each method was evaluated based on the mean percentage of plaque reduction after the first usage, and also the mean percentage of the plaque remained after using the method for 7±1 days. The time needed for instruction, learning and using the methods were also compared. The statistical analysis was done using the SPSS software and variance analysis (randomised block design). Results: Considering all the teeth and their total surfaces; after 1st usage, the methods of C and MB1 were statistically more effective than the other methods. But the difference between these two methods was not significant. Also after 7±1 days, the differences between all methods were not statistically significant. On the posterior teeth, after 1st usage and also after 7±1 days, the method of C was significantly more effective than the others, with the exception of MB1 for which their differences were not significant. Also MB1 was significantly more effective than the methods of Bass and Roll, but only after the 1st usage. On the anterior teeth, after 1st usage, method of C was statistically more effective than the methods of Bass, MB2 and MS. Also MB1 was significantly more effective than MB2 and MS. But after 7±1 days, the differences proved insignificant. Considering the specific surfaces of the teeth; on the proximal surfaces, after the 1st usage of the methods, the methods of C and MB1was significantly more effective than the others, except each other, which their difference was not significant. But after 7±1days the method of C was statistically more effective only than the methods of Bass, MB2 and MS, and the method of MB1was significantly more effective than MB2. On the buccal and lingual surfaces the differences were not statistically significant at both stage of evaluation. When statistically considering the time needed for instruction, learning and usage, the method of C needed more time than Bass and Roll methods. In the same way, MB1 needed more time than Roll method. The most time needed was related to MB2 which was more than the time needed for the methods of Bass, Roll and MS (P<0.001 and alfa=0.05).Conclusion: The tooth brushing methods of Charters’ and a kind of MODIFIED Bass method (in which Bass and Roll methods are used separately and consequently) were evaluated as the most effective methods.

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strs
Issue Info: 
  • Year: 

    2009
  • Volume: 

    26
  • Issue: 

    4
  • Pages: 

    515-521
Measures: 
  • Citations: 

    0
  • Views: 

    1199
  • Downloads: 

    247
Abstract: 

Background: Abdominal pain is one of the most Important and considerable issues in children. One of the most common causes of abdominal pain in children is acute appendicitis. The course of acute appendicitis in children is very faster than adults. Clinical manifestations in Pediatric patients are less typical and are not able to tell the exact history. In addition, no other signs or diagnostic tests can exactly detect the acute appendicitis in Pediatrics. Purpose of this study was the assessment of MAS in diagnosis is of acute appendicitis in Iranian Pediatrics patients.Methods: This prospective study was conducted in Loqman Hakim hospital in 1384-5 .Three hundred children aged from 4 to 12 years old with acute abdominal pain were assessed. All of information were taken from their data sheets and pathologic reports and scored in the form of 24 variables (age, sex ... ) The results were analyzed via statistic soft ware spss 12 and absolutes score of MAS was counted on the basis of clinical variables.Findings: Based on the MAS the patients were divided to 2 groups: the first group were the patients with score of <7 including 147 cases (49 percent). The second group were the patients the score of ³7 Including 153 cases, (51 percent). In overall, from 300 cases that operated with the suspicious of appendicitis, 269 cases (89.6%) in the pathologic assessment had acute appendicitis. from the patients with score of <7 (147 cases), 124 cases had diagnosis of acute appendicitis (84/35%) from the patients with score of ³7 (153 cases), 145 cases had diagnosis of acute appendicitis (94.77%) this outcomes showed no significant difference between these groups in the diagnosis of appendicitis based of this score.Conclusion: According to this analysis, sensitivity of this scoring system in the diagnosis of acute appendicitis was 53.9% and the specificity was 74.19% showing the MAS in diagnosis of acute appendicitis in Iranian pediatric patients is not soley effective and can't be an absolute clue and should be progressed in sensitivity and specificity.

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Author(s): 

HUANG L. | MEJIAB N.

Issue Info: 
  • Year: 

    2005
  • Volume: 

    29
  • Issue: 

    B6
  • Pages: 

    587-596
Measures: 
  • Citations: 

    0
  • Views: 

    61903
  • Downloads: 

    43600
Abstract: 

At McGill University, Canada, a successful Knelson technology for GRAVITY recoverable gold (GRG) has been used to process more than 200 representative gold ore samples all over the world since the early 1990s. In recent years, the applications of this technology have expanded to platinum group metals (PGM). The investigation of INCO Clarabelle Mill grinding circuit products shows that, like gold, PGM selectively enrich in some of the grinding products, such as ball mill discharge and cyclone underflow, and they are amenable to GRAVITY separation. The GRAVITY recoverable PGMs and Au were well characterized with a combination of regular Knelson and Variable Speed Knelson technology.

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Issue Info: 
  • Year: 

    2014
  • Volume: 

    40
  • Issue: 

    3
  • Pages: 

    23-33
Measures: 
  • Citations: 

    0
  • Views: 

    66919
  • Downloads: 

    20857
Abstract: 

Applying 2D algorithms for inverting the potential field data is more useful and efficient than their 3D counterparts, whenever the geologic situation permits. This is because the computation time is less and modeling the subsurface is easier. In this paper we present a 2D inversion algorithm for interpreting GRAVITY data by employing a set of constraints including minimum distance, smoothness, and compactness. Using different combination of these constraints provide either smooth images of the underground geological structures or models with sharp geological boundaries. We model the study area by a large number of infinitely long horizontal prisms with square cross-sections and unknown densities. The final density distribution is obtained by minimizing an objective function that is composed of the model objective function and equality constraints, which are combined using a Lagrangian multipliers. Each block's weight depends on depth, a priori information on density and the allowed density ranges for the specified area. A MATLAB code has been developed and tested on a synthetic model consists of vertical and dipping dikes. The algorithm is applied with different combinations of constraints and the practical aspects are discussed. Results indicate that when a combination of constraints is used, the geometry and density distribution of both structures can be reconstructed. The method is applied on Zereshlu Mining Camp in Zanjan - Iran, which is well known for the Manganese ores. Result represents a high density distribution with the horizontal extension of about 30 m, and the vertical extension shows a trend in the E - W direction with a depth interval between 7 to 22 m in the east and 15 to 35 m in the west.

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    3
  • Issue: 

    2
  • Pages: 

    1-11
Measures: 
  • Citations: 

    0
  • Views: 

    3235
  • Downloads: 

    301
Abstract: 

The aim of this paper is to study the theory of spline interpolation and smoothing problems on the surface of a triaxial ellipsoid for the Consecutive Iterated Helmholtz operator and a set of linearly independent evaluation functionals. Spline functions were introduced based on the minimization of a semi-norm in the context of a semi-Hilbert space whose domain was the surface of the ellipsoid. The semi-Hilbert space was decomposed into two different subspaces, a particular Hilbert space and the null space of the desired operator. Using surface Green’ s functions for the Consecutive Iterated Helmholtz operator, the reproducing kernel for the Hilbert subspace was constructed. Spline and smoothing functions were explicitly represented based on the reproducing kernel and the evaluation functionals. An approximation formula was derived to facilitate the potential use in Earth’ s GRAVITY field data interpolation and smoothing. An application of this technique was presented to show the interpolation of potential fields over Iran. Ellipsoidal and spherical splines were compared as well. It revealed the ellipsoidal splines to be more accurate than the spherical counterparts.

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