Showing 35 results for Hashemi
Sj. Porhashemi , J. Mahmodian ,
Volume 6, Issue 1 (9 1993)
Abstract
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AR-SA During the recent century, the prevalence of
dental caries has been changed widely. Therefore, following industrial
revolution of Europe in 19th century and industrialization of European
countries as well as population increase in the cities and changes in
nutritional diets of people, dental caries prevalence has rapidly increased.
Thus, by feeling danger and improving awareness, These countries decided to
prevent caries. This , lead to a considerable decrease in DMF indices. In
developing countries, the situation was reversed and although industrial
developments have happened, dental caries prevalence has been gradually
increased. In this article, the etiology of these transitions is discussed and
analyzed and practical solutions are mentioned.
H. Mahmodhashemi ,
Volume 10, Issue 2 (8 1997)
Abstract
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AR-SA Osteodistraction is a technique for increasing
the length of bone in order to form new bone by using natural bone healing mechanism of the body.
In general, Osteotomy surgery (
corticotomy) is done in the place which bone lengthening is needed. Then an
external fixator is installed that is
continuously lengthened and forms new bone at the same time. Distraction biology, Indications and contraindications
in maxillofacial region and different methods of it is discussed in current
article.
Sj. Pourhashemi , B. nabaei ,
Volume 12, Issue 1 (9 1999)
Abstract
The purpose of this survey was the determine of effectiveness of preventive precisures. 320 twelve years school student have chosen randomly. After determination of DMFT All of them divided to 4 groups. First group as control and the other groups were as oral hygiene education 6-fluoride therapy and sealant therapy group in a period of two years.Results of this study showed that fluoride therapy was more effective than the other procisures than oral hygiene instructions.
H. Mahmood Hashemi ,
Volume 12, Issue 2 (9 1999)
Abstract
The most important craniofacial dysostosis & syndromes are Crouzon, Apret, Pfeiffer.Carpenter Saether- Chotzen. The common characteristic is premature closure of cranial sutures, which result in Maxillofacial deformities. Perfect recognition and carefully evaluation are the most important points in their reconstruction surgery.Because the prevalence & surgical treatment of Crouzon syndrome is low, I present a case report include surgical treatment of a patient with crouzon which was a accomplished in Shariati Hospital.
Sj. Pourhashemi ,
Volume 13, Issue 2 (7 2000)
Abstract
Over 20 years, several analytical approaches have been designed to predict caries in children.Caries Risk Assessment is a recently developed technique concern to caries prediction.This procedure involves three stages as follows:1- Determination and assessment of the dental caries risk factors.2- Examination and evaluation of each individual child to be specifically diagnosed the level of 3- caries risk e.g. high, moderate and low risk.3- Recommendation of preventive programs according to risk assessment.Because children vary widely in their ability to develop cavities, a well-organized program holds great promise for promoting dental heath for pre-school children of varying caries risk. This article considered a series of principals that dentist can use in case planning, management and prevention programs according to risk assessment.
H. Mahmood Hashemi ,
Volume 14, Issue 1 (9 2001)
Abstract
Dry socket is one of the most common complications of teeth extractions. Etiology and pathogenesis of dry socket are not clearly known but many related predisposing factors have been discussed. According to this, a cross- sectional study was conduced at the department of oral and maxillofacial surgery (Tehran University of Medical Sciences, Oct. 97- Jul. 98). 4880 teeth were extracted which 25 of them recalled with dry socket. The relationship between the effective factors and dry sockets was evaluated. The effective factors were as follows: age, sex, site of extraction, and trauma during exctraction, infection, oral hygiene, smoking, and systemic diseases. Results showed that the incidence of dry socket was %0.5, and the number of cases observed in women was two times more than men. Also, mandibular third molars were involved more than any other areas.
S. Nokar , A. Monzavi , F. Hashemi ,
Volume 15, Issue 2 (8 2002)
Abstract
Retention, resistance and marginal integrity mostly depend on tooth preparation. An appropriate convergence angle fulfil this purpose, to high extent. In this study, a new method was used to measure the convergence angle of the teeth prepared for single crowns in Genera! practitioners" offices in Tehran. In order to do this. 325 dyes, prepared by General dentists in Tehran, were collected from 10 laboratories. All dyes wore trimmed at the area below the finishing line and then were scanned (Genius Color page- FIR 6) buccoiingualiy and mesiodistaily. Convergence angle of dyes were also measured with Adobe Photoshop (5.0) software. Data were analyzed by variance analysis test and 1- student bv the help of SPSS software. Results showed that the average convergence angle ranged from 16.18+8.34 to 35.1 8~10.38 which belonged to maxillary canine and mandibular molars, respectively, and the measured convergence angle is more than the ideal value of 10-16 degrees. Dyes of the madibular molars were ma"illar" convergent. These conclusions are helpful for professors, dentistry students and dentists, and arc an indicative of the practice quality of General practitioners in Tehran. Due to the fact that a convergence angle, more than the allowed limitation, endangers retention, resistance and marginal integrity of the restoration, paying attention to the principles of tooth preparation and proper application of instruments and dental cements, can progress fwed restorations quality.
V. Talebi , H. Mahmood Hashemi , H. Gahani Hashemi ,
Volume 16, Issue 2 (8 2003)
Abstract
Statement of Problem: One of the easiest and most practical methods to predict the size of permanent canines and premolars, is of Tanaka-Johnston, but their research has been only performed on white skin North Europeans and it should be noted that the size of teeth, in various races, differ from each other.
Purpose: The aim of this study was to determine the validity of Tanaka-Johnston method, in a sample population taken from Ghazvin city.
Materials and Methods: The numbers of 235 pairs of study casts, prepared before any kind of treatment, were selected. The size of lower permanent incisors and permanent canines and premolars of both arches were measured. To analyze the results, "regression analysis" and "t test" were used.
Results: Based on the findings obtained from this study, new prediction equations as Y=12.9+0.4(X) and Y=]0.6+0.5(X) were presented for maxilla and mandible, respectively. However, these equations did not differ from Tanaka-Johnston equations statistically.
Conclusion: Tanaka- Johnston equations can be acceptably applied for the sample population taken from Ghazvin city, if the predictions are not overestimated.
S.j Poorhashemi ,
Volume 17, Issue 3 (7 2004)
Abstract
Statement of Problem: The accomplishment of oral and dental health is one of the most important goals in preventive dentistry influenced by the people’s knowledge and attitudes. Health system personel are the group able to play the most important role in this field affecting the society under their control directly.
Purpose: The aim of this study was to evaluate the knowledge of health system personel, working in Ghom province, about oral and dental health.
Materials and Methods: In this descriptive cross-sectional study, knowledge and attitudes of all 187 personel working in the health system center of Ghom province were investigated through a questionnaire including 10 questions on knowledge and 10 other ones on the attitudes of subjects studied. Data were subjected to ANOVA, Tukey and correlation tests.
Results: The knowledge of females was higher, compared to males showing a statistically significant difference (P<0.05). There was a positive correlation between subjects’ knowledge and their level of education, age and work duration (P<0.05).
Conclusion: Generally, the level of knowledge and attitude of the personel working in health centers in Ghom province was acceptable but not an ideal one and the continuity of training and re-education courses seemed necessary.
M. Ghavam , Z. Sadat Hashemi ,
Volume 18, Issue 1 (30 2005)
Abstract
Statement of Problem: Bleaching materials are able to change the surface morphology as well as mineral and organic content of tooth structure. Considering that bleaching is done for aesthetic purpose, awareness of the possible effect of these materials on hard tissue is important, because it may affect the restorative treatments.
Purpose: The aim of this study was comparing the effect of two bleaching materials, Kimia and Ultradent both containing 35% H2O2, on tooth enamel by SEM.
Materials and Methods: Five intact central incisors were cut into three sections vertically and each part was randomly divided into three groups. Group 1 (control), without any bleaching. Group 2, bleached with Kimia 35% H2O2. Group 3, bleached with Ultradent 35% H2O2. Each tooth served as its own control. Then the samples were observed by SEM with 250 and 500 magnifications.
Results: In the control group some scratches and small white grains were observed which seems to be the result of mastication trauma and pumice powder. In the other groups, morphologic changes like increased surface roughness, deepening of cracks, rod exposure and presence of new cracks were observed. The two experimental materials did not differ in these regards.
Conclusion: It seems that both studied materials have limited destructive effects on tooth enamel which seems to be of no clinical importance.
H. Mahmood Hashemi ,
Volume 18, Issue 3 (11 2005)
Abstract
Background and Aim: The treatment of epulis fissuratum is surgery, but a new proposed modality is laser surgery. The aim of this study was the comparison between laser and blade surgery in the treatment of epulis fissuratum.
Materials and Methods: In this clinical trial, 12 patients with epulis fissuratum were selected. The lesions were divided into two parts. One part was resected by laser and the other by surgical blade randomly and single blinded. The time of surgery, bleeding, wound repairment as well as the depth of vestibule were measured. Data were analyzed using Wilcoxon sign test and Paired t test with P<0.05 as the limit of significance.
Results: The wound of laser surgery healed sooner and the depth of vestibule in laser side was deeper comparing with blade surgery. Also the time of surgery was less than blade.
Conclusion: Based on the results of this study, we suggest that laser surgery is a more useful technique for the treatment of epulis fissuratum.
Sm. Hasheminya , B. Bahreini ,
Volume 18, Issue 4 (5 2006)
Abstract
Background and Aim: Care must be taken during root canal therapy to prevent contamination of filling materials and avoid root canal contamination. Gutta-percha cones are now widely used to fill root canals. However they are not resistant to conventional sterilization processes in moist or dry heat. To keep the aseptic chain, gutta-percha cones require rapid chair side decontamination before use. Considering different methods for rapid decontamination of gutta-percha cones, use of chemical agents is the best. The purpose of this study was to compare the effectiveness of three different disinfectant solutions in rapid decontamination of gutta-percha cones in one minute
Materials and Methods: In this experimental study, 360 gutta-percha cones were placed in bacterial suspensions of Staphylococcus aurous, Escherichia coli and Bacillus subtilis spore for 30 minutes, and then immersed in disinfectant solutions (Micro-10, Deconex 53 Plus, 5.25% sodium hypocholorite) for 1 minute. After that, the cones were aseptically transferred to the test tubes containing sterile saline. This solution was diluted 10-fold and then cultured on in brain-heart-infusion agar and the number of colonies was estimated after 24 h incubation at 37ْC. A series of 5 previously sterilized cones was used as negative control to check the sterility of gutta-percha cones directly from the manufacturer's box. Another series of gutta-percha cones were considered as positive control group.
Results: No bacterial growth was seen in different test groups and negative control group.
Conclusion: Analysis of disinfectant effects of sodium hypochlorite, Micro10 and Deconex 53 plus showed that all of these solutions have bactericidal and sporocidal effect and are very efficient in surface disinfection of gutta–percha cones in one minute. Because of irritative effects and unpleasant odor of sodium hypochlorite, Deconex 53 plus and Micro10 can be used for rapid decontamination of gutta-percha cones.
H. Mahmood Hashemi ,
Volume 19, Issue 1 (3 2006)
Abstract
Background and Aim: Several factories produce dental cartridge in the world. In Iran, Daroupakhsh company is responsible for this task. The aim of this study was evaluate some properties of daroupakhsh cartridge and compare them with two imported ones: Ecocaine (made in Italy) and Septodont (made in France).
Materials and Methods: In this experimental study, 70 healthy patients from maxillofacial clinic of Shariaty hospital were selected. After obtaining informed consent, 0.1 cc of each carpule was injected to the patients' frontal region and the extent of anesthesia was measured at different time intervals. Also the quality of injections was evaluated by 11 surgeons. The dimensions of the three cartridges were also measured and compared together. Data were analyzed by repeated measure ANOVA and Friedman with p<0.05 as the limit of significance. Results: There was no significant difference in extent and duration of anesthesia among the studied cartridges. Surgeons were equally satisfied of all three kinds of cartridges. All of the cartridges were aspirable.
Conclusion: Based on the results of this study, the three studied cartridges had similar properties.
Sm. Hasheminia , S. Norouzynasab ,
Volume 20, Issue 2 (9 2007)
Abstract
Background and Aim: During root canal therapy, it is necessary to remove as many bacteria as possible from the root canal. The use of medicaments is recommended to reduce the microbial population prior to root filling. Calcium hydroxide pastes have been used because of their antibacterial effects and the ability of tissue dissolving. The aim of this study was to evaluate the effect of calcium hydroxide/glycerine mixture, calcium hydroxide/normal saline mixture and calcium hydroxide/distilled water mixture on root dentin microhardness in storage times of 7 and 14 days.
Materials and Methods: In this in vitro study, fifteen extracted maxillary canines and central incisors were selected. The crowns of the teeth were removed and the canals were prepared. Teeth were sectioned transversally to produce a total of 30 dentin discs from the middle third of the roots. Specimens were divided into three groups of 10 discs each. Dentin samples were subjected to calcium hydroxide/glycerine, calcium hydroxide/normal saline and calcium hydroxide/distilled water mixtures for 7 and 14 days. Dentin microhardness was measured by a Vickers indenter with a load of 200 g for 15 seconds. Data were analyzed using ANOVA, Paired t-test and LSD with p<0.05 as the level of significance.
Results: Statistical analysis showed that all three mixtures decreased dentin microhardness. After 7 days, reduction in dentin microhardness by calcium hydroxide/glycerine combination was significantly higher than calcium hydroxide/normal saline and calcium hydroxide/distilled water combinations. After 14 days, reduction in dentin microhardness by calcium hydroxide/distilled water combination was significantly higher than the other two groups.
Conclusion: Based on the results of this study, the use of calcium hydroxide combinations for intracanal dressing reduces dentin microhardness. After 7 days calcium hydroxide/glycerine combination and after 14 days calcium hydroxide/distilled water combination are the most effective combinations.
H. Mahmood Hashemi , P. Shokri ,
Volume 20, Issue 4 (5 2008)
Abstract
Background and Aim: Proximal segment movements following different methods of ramus osteotomy is one of the undesired consequences of orthognathic surgery. Theoretically, it seems that intraoral verticosagittal ramus osteotomy can minimize the movement of proximal segment. In this study, changes in intergonial distance and ramus flaring angles were evaluated and compared in transverse plane after mandibular set back by two osteotomy techniques.
Materials and Methods: In this randomized clinical trial 20 patients with mandibular prognathism without any asymmetry were selected and divided into two groups of 10 each.One group was treated by bilateral sagittal split ramus osteotomy and the other by intraoral verticosagittal ramus osteotomy technique. Intergonial width and inner ramal angle in transverse plane were measured on radiographs before and 1 and 12 weeks post surgery . Data were analyzed using covariance test with P<0.05 as the level of significance.
Results: Changes of intergonial distance and interramal angle in each group were significant after 1 and 12 weeks after surgery. No statistically significant difference was observed between the two studied groups.
Conclusion: According to the results of this study, there is no difference between bilateral sagittal split and intraoral verticosagittal ramus osteotomy techniques regarding mandibular width and ramus flaring changes.
J. Pourhashemi, F. Mohandes, Ar. Talaeipour,
Volume 21, Issue 1 (14 2008)
Abstract
Background and Aim: Diagnosis of occlusal caries in early stages is more difficult than other types, and needs practical proficiency and accuracy as well as application of advanced and modern equipments. The aim of this study was to evaluate the variations among dentists in diagnosis of occlusal caries.
Materials and Methods: In this descriptive cross-sectional study, 6 permanent first molar teeth of 8-10 years old children with occlusal caries of 1, 2 and 3 degrees were selected (Espelid method). Color photographs and bitewing radiographs of teeth were displayed on computer monitor and 157 general dentists were asked to determine the existence and depth of caries. Data were analyzed using SPSS software and chi-square test. P<0.05 was considered as the level of significance.
Results: 94% of dentists did not diagnose any lesion in grade I caries.3.8% reported enamel caries (correct diagnosis) and 1.9% reported dentin caries. In grade II caries, 15.7% of dentists could not diagnose any caries, 60.7% recognized the caries at the level of enamel (correct diagnosis), and 22.31% reported the dentin level, and 1.3% reported pulp exposures.7% of dentists could not diagnose any caries in grade III, while 27.2% recognized lesions at enamel and 58.9% at dentin level (correct diagnosis), 6.1% of dentists reported pulp exposures and 0.3% did not respond. Female dentists showed significantly higher correct diagnosis compared to males (p=0.013).
Conclusion: Based on the results of this study, despite considerable variations among general dentists in diagnosis of occlusal caries, the total accuracy was acceptable.
Hashemi Mahmood , ,
Volume 21, Issue 2 (12 2008)
Abstract
Background and Aim: Zygomatic fractures are common among oral and maxillofacial problems and ocular injuries are of great importance, the prevalence of ocular problems following zygomatic fractures in Iran is not clear so we performed this study to evaluate this problem in patients referring to Shariati Hospital.
Materials and Methods: In this descriptive, cross-sectional study, we evaluated the patients who referred to department of oral and maxillofacial surgery of Shariati hospital for ocular complains following zygomatic fractures. The evaluation was performed both clinically and historically.
Results: 115 patients were examined (87 males and 28 females) with the mean age of 26 for males and 32 for females. The prevalence of ocular injuries were as follows: subconjunctival ecchymosis: 23.07% for males and 21.05% for females. Displacement of palpebral fissure: 26.5% for males and 27.6% for females. Unequal papillary levels: 18.37% for males and 15.78% for females. Diplopia: 8.9% for males and 10.5% for females. Enophthalmos: 23.1% for males and 25% for females.
Conclusion: It is strongly recommended to refer patients with zygomatic fracture for an ophthalmologic consultation.
M. Hashemipour, Mr. Korki,
Volume 21, Issue 3 (8 2008)
Abstract
Background and Aim: Infective endocarditis is a rare disease resulted in mortality and morbidity in 10-80% of patients. The purpose of present study was to investigate the knowledge of guidelines on antibiotic prophylaxis for bacterial endocarditis in a group of Iranian dentists.
Materials and Methods: This was a descriptive study in which the population under study was 205 who were participated in the 47th international congress of dentistry (Tehran-Spring 2007) and they were chosen by census sampling methods. Nameless questionnaires were designed and were given to the dentists to complete. The t-test, χ² and spearman with the SPSS 13.5 program were used in the data analysis. P<0.05 was considered as the level of significance.
Results: Regarding to the prescribing of prophylactic antibiotic for patients with prosthetic cardiac valves, 94.6% of all answers were correct. Also, the most common procedures in which the prophylaxis antibiotic was distinguished to be necessary were periodontal surgery, scaling, dental extraction and using subgingival cord, respectively. More than half of the dentists (65.8%) had chosen amoxicillin as a prophylactic antibiotic. Mean knowledge score was 38.77±12.4.
Conclusion: Results of the present study showed that the knowledge of dentists about prescribing antibiotics for prevention of bacterial endocarditis is relatively low. It was also found that the level of knowledge decreases by passing time from graduation.
F. Ezoddini Ardekani, Z. Mohammadi, Z. Hashemian, M. Sadrbafghi, A. Hedayati, Mj. Rahmani Baghemalek,
Volume 22, Issue 1 (11 2009)
Abstract
Background and Aim: Dental pulp calcification may have the same pathogenesis as vascular calcifications. Pulp stones are calcified mass, which are commonly observed in usual dental radiographs. The purpose of this study was to evaluate the relationship between pulp stones and ischemic CVD.
Materials and Methods: This was a cross-sectional descriptive-analytic study on 20-25-year-old patients who had at least 8 intact teeth and were referred to Afshar hospital for cardiovascular examinations. Relationship between vascular stenosis and dental pulp stone was explored.
Results: Sixty one patients who had undergone angiography were studied. They included 32 male (52.5%) and 29 female (47.5%). 38 patients had at least one stenotic vessel (from one to three vessels) and the others (37.7%) showed normal angiographic findings. 73.8% (31 cases) of the patients with dental pulp stones suffered from coronary narrowing where as only 36.8% (7 cases) of the patients without dental pulp stones showed coronary vessels narrowing. Pulp stones were mostly seen in first and second Molar teeth.
Conclusion: According to the results, we can state that oral and maxillofacial radiology is helpful in screening of cardiovascular diseases.
H. Kermanshah, S. Hashemi Kamangar, S. Arami, A. Mirsalehian, M. Kamalinejad, M. Karimi, F. Jabalamoli,
Volume 22, Issue 2 (20 2009)
Abstract
Background and Aim: The microbial cause of dental caries has been proved among its multifactorial etiologies. The prevention and control of dental caries is very critical because of high prevalence and cost especially in high risk patient such as xerostomia. Based on the world attraction to traditional treatment and importance of drug extraction of natural materials and plants, in this in vitro study effect of hydroalcoholic extract of Salvia officinalis and Pimpinella anisum which were very useful in traditional treatment of mouth and teeth disease has been determined against cariogenic bacteria.
Materials and Methods: In this experimental study, hydroalcoholic extracts have been prepared from Salvia officinalis and Pimpinella anisum with maceration method. Their antibacterial activity against Streptococcus mutans, Lactobacillus rhamnosus and Actinomyces viscosus have been evaluated with broth macrodilution method. Data were analyzed with Mann-Whitney test.
Results: Minimum Inhibitory Concentration for Salvia officinalis and Pimpinella anisum for streptococcus mutans were respectively 6.25 and 12.5 µg/ml, for Lactobacillus rhamnosus were 1.56 and 12.5 µg/ml and for Actinomyces viscosus were 12.5 and 50 µg/ml.
Conclusion:Both extracts had growth inhibitory effect on all three bacteria. Salvia officinalis had significantly greater effect on inhibition of growth of all three bacteria. Both extracts had bactericidal effect in the range of concentration.
