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Showing 13 results for Yazdani

Gh. Jahanshahi , M . Yazdani , F. Asadian ,
Volume 16, Issue 3 (10 2003)

Statement of Problem: Candidal colonies make up a part of natural oral flora and are considered as predisposing factors for opportunistic infections. Since hemodialysis leads to body Immune suppression and make patients susceptible to opportunistic infections, it is useful to investigate the relationship between hemodialysis and such infections.
Purpose: The aim of the present research was to study the relationship between oral candidal colony count and duration of hemodialysis and also to investigate the probable necessity for prophylaxis against oral candidiasis. Factors such as oral temperature, age, sex, denture, smoking, drugs, candidal microscopic view and clinical signs of oral infections, were also studied in relation to candidal colonies.
Material and Methods: The smear of posterior part of tongue and oral fluids from 114 hemodialysis patients in Khorshid hospital, Isfahan University of medical Sciences were cultured. The number of oral candidal colonies and their microscopic view were studied in relation to the duration of hemodialysis and other factors. To analyze the data, Pearson and Spearman statistical tests were used.
Results: No statistical significant relationship was observed between oral candidal colony count and the duration of hemodialysis.
Conclusion: Due to the abundant predisposing factors for oral candidal infection, the probability of oral candidiasis cannot be predicted based on a single factor, namely duration of hemodialysis. As a result,according to this study, the prophylactic prescription of antifungal drugs are not suggested in hemodialysis patients. However, the results of the present study should not be over generalized and more studies are required.
Mt. Chiisazi , Kaviarri F., J. Yazdani ,
Volume 17, Issue 4 (7 2005)

Statement of Problem: In spite of the limitations of Radiography, diagnosing of periodontal diseases without having accurate radiographs is inadequate because it provides a visible image of the supporting bone to the clinician and works as a fixed measure of the supporting bone during the study.
Purpose: The aim of this study is to compare the precision of preiapical, bitewings and panoramic radiographs in determining the distance between the alveolar crest (AC) and cementoenamel junction (CEJ) of teeth.
Materials and Methods: Statistically this is a survey study in which 120 interproximal surfaces of teeth were measured during surgery by periodontal probing and recorded as the actual measurement. Then 40 sites underwent bitewing, 40 sites preapical and 40 others panoramic radiography and the distance of CEJ up to the alveolar crest of bone was measured on them by periodontal probe and recorded. Then each group was analyzed separately and the Pearson's correlation coefficient was examined for the data.
Results: The results of this study showed that when the thickness of the remaining bone in a millimeter limit
is important for (he surgeon, the bitewing radiography has a prime importance, but when bone loss is
moderate, the panoramic radiography showing %89 of the cases close to the actual measure, can be
acceptable. On the other hand, in anterior sites for determining the bone alteration, preiapical radiography
with a 0.93 correlation coefficient is superior to the panoramic radiography with a correlation coefficient of
0.72 and we suggest it for examining the changes of bone in these sites.
Conclusion: whenever the bone alteration is moderate or severe, it seems that, bitewing radiography is of
particular importance, but when the bone loss is little, panoramic radiography can be used and there is no need
to put the patient on unnecessary radiation.
A. Jafari, Mr. Khami, R. Yazdani, M Mohammadi,
Volume 22, Issue 4 (21 2010)

Background and Aims: The objective of the present study was to investigate knowledge and attitude of senior dental students towards HIV/AIDS. Its result could help in promotion of education.

Materials and Methods: This educational research was carried out in two state dental schools in Tehran. The senior dental students in Tehran and Shaheed Beheshti dental schools were asked to fill in a self-administered questionnaire regarding their age, gender, parents' job, knowledge and attitudes towards treatment of patients with HIV/AIDS in Autumn semester 2007. Fifty five dental students (83%) including 27% male and 73% female in Shaheed Beheshti and fifty five dental students (85%) including 34% male and 66% female in Tehran dental schools were participated. The score for knowledge and attitude of the students were calculated separately. The data were analyzed using Independent sample t-test.

Results: The mean percentage of knowledge and attitude scores were 76.5% (at rang 1-3) and 50% (at range 1-5), respectively. Nearly all of the students believed that all patients should be considered as HIV positive in dental practice, while 49% preferred to refer HIV positive patients. Knowledge and attitude of students were not significantly associated with the gender and knowing HIV positive person (P>0.05).

Conclusion: There is a need to improve knowledge and attitudes of dental students towards HIV/AIDS. It is suggested to emphasize on this subject in dental schools curriculum in Iran.

Mohamad Reza Khami, Ensieh Akhgari, Anahita Moscowchi, Reza Yazdani, Simin Zahra Mohebbi, Afsaneh Pakdaman, Samane Razeghi,
Volume 25, Issue 1 (7 2012)

Background and Aims: The aim of the present study was to investigate self-perceived need to learn practice management and self reported knowledge in this regard among dentists.

Materials and Methods: A group of five academic staff members of Community Oral Health Department (Tehran Dental School) and four dentists formed an expert panel to develop the content of the course. This group developed a list of topics related to principles of successful dental practice. To investigate the necessity of educating the topics and self-assessed knowledge of the topics, a questionnaire was designed and administered to 55 volunteer dentists. Forty six dentists completed the questionnaire. T-test and Chi-square test were used for statistical analyses.

Results: Totally more than two-third of the dentists believed that a huge need exists for education of all the topics. The corresponded figure for such topics as ergonomics and medical emergencies was about 90%. About 80% of the dentists felt that they had a vast knowledge of safety and infection control. On the other hand, 54.3% of them reported weak knowledge regarding professional rules and regulations. Self-reported educational need and knowledge of the dentists did not show significant association with their age, gender, and work experience

Conclusion: The dentists believed in the necessity of educating such topics and evaluated their knowledge as deficient in these areas. This shows the necessity of developing courses on these topics.

Reza Yazdani, Hamide Kalkou, Mohammadreza Khami ,
Volume 26, Issue 3 (8-2013)

  Background and Aims: Iatrogenic damage to adjacent tooth during proximal cavity preparation is one of the most common side effects in operative dentistry. The aim of this study was to determine prevalence of iatrogenic damages to adjacent tooth during the preparation of proximal Class II cavities among undergraduate students at dental faculty of Tehran University of Medical Sciences in 2010 .

  Materials and Methods: 106 posterior permanent teeth which had Class II decay with sound proximal surfaces of adjacent teeth were selected and restored by dental students awarding the aims of the present study. After finishing restoration, proximal surfaces were completely dried by air and evaluated with dental chair light. In doubtful cases, surfaces were evaluated with × 3 magnification. Damages were classified into 2 groups abrasion and groove. Data were analyzed using Fishers exact and Pearson chi square tests .

  Results: The frequency of adjacent surfaces damage were 57.5%, with 31.1% damages as abrasion and 26.4% as groove. Students who used matrix band and wedge in proximal area as preventive instruments showed 53.4% damages and other students showed 57.3% damages (P>0.05). A significantly higher number of females and students at restorative course level (3) used wedge and matrix band than males and students at restorative course level (4) for protecting adjacent teeth (P<0.05).

  Conclusion: According to the high percentage of iatrogenic damages on adjacent sound teeth in class II cavity preparation, teaching of preventive methods and using proper techniques is necessary for dental students as future dentists.

Simin Zahra Mohebbi, Reza Yazdani, Seyedeh Tahereh Mirmolaei, Zeinab Tartar, Atoosa Janeshin,
Volume 26, Issue 4 (1-2014)

  Background and Aims : As midwives are in frequent contact with pregnant mothers, they may play a key role in their oral health care (OHC). In this study, we aimed to evaluate the effect of an educational program on Tehran University of Medical Sciences midwifery students’ knowledge and preparedness on OHC in pregnant mothers. Materials and Methods: The midwifery third year students of central campus (n=29) were randomly selected as intervention group and their counterparts in Hemmat campus (n=33) as control. Students in both groups were asked to fill in a questionnaire included 8 demographic question and 18 OHC knowledge and one question on their preparedness to implement OHC. Then the educational intervention was implemented using lecture, demonstration of the correct methods of brushing and flossing on the models and role play method. The follow- up questionnaire was delivered 3 months later. Data were analyzed using Mann-Whitney test, T-test, Chi-Square test, ANOVA and Regression by SPSS software.

  Results: The mean OHC in pregnancy knowledge score in intervention and control group were 26.7 and 24.8 at baseline which were changed into 48.5 and 29.1, respectively (P<0.001). Among the students 52.6% in the intervention group and 36.4% in the control group reported very high preparedness to implement OHC in pregnancy. These figures were 68.2% and 41.7% in the post-test.

  Conclusion: The promising findings of this educational intervention comprising of both student and teacher-centered methods speak for possibility of improving these students knowledge and preparedness and implies on the necessity to incorporate the related course in midwifery education.

Mohamadreza Khami, Arezo Ebne Ahmadi, Mina Ahmadian, Samaneh Razeghi, Reza Yazdani,
Volume 27, Issue 3 (9-2014)


  Background and Aims: Tobacco kills 5 million people worldwide annually, according to the Health Ministry reaches this number is about 70,000 people a year in Iran. Dental professionals are in a unique position to promote smoking cessation due to the opportunity for regular interaction with their patients. The aim of this study was to investigate knowledge, attitudes, and skills of dental students at Tehran and Shahid Beheshti dental schools towards tobacco cessation counseling in dental office.

  Materials and Methods: In this cross-sectional study, the target group was dental students at Tehran and Shahid Beheshti dental schools, and the sampling method was census. A questionnaire on the knowledge, attitudes, and skills towards tobacco cessation counseling in dental practice was administered to the students (n=93). Data were analyzed using T-test.

  Results: The response rate was 100% (93 students participate in this program and all of them filled the questionnaire). The average score of knowledge at Tehran and Shahid Beheshti dental schools was 17.5 and 18.4, respectively (P=0.09), the average score of attitudes was 33.5 and 33.1, respectively (P=0.80). There were no significant differences between the two dental schools in these parts. The average score of skill was 11.9 and 16.6, respectively. The differences between the students of two dental schools in skill were significant (P=0.002).

  Conclusion: Although the attitude of dental students at Tehran and Shahid Beheshti schools towards tobacco cessation counseling seemed to be fair, some deficiencies existed in their knowledge and skill. Dental education programs should be implemented properly in this field.

Shamsolmoulouk Najafi, Reza Yazdani, Behzad Salari, Homa Forouhesh Tehrani, Mohammad Javad Kharrazi Fard,
Volume 29, Issue 2 (11-2016)

Background and Aims: The aim of this study was to investigate the effects of sodium bicarbonate against candida albicans, the main infectious factor of denture stomatitis, and to compare it with other common anti-candida medications.

Materials and Methods: Three concentrations of Candida albicans (105, 106, 107 CFU/mL) were prepared. Experimental substances were 5% sodium bicarbonate, nystatin, chlorhexidine, and sterile saline (as control). Each of them was added separately to the same amounts of Candida albicans of different concentrations, and sampled at the intervals of 1, 2, 3 and 4 min. Then, the samples were cultured and incubated. The number of formed colonies was counted for each plate. The data were analyzed, using ANOVA and Tukey test.

Results: Sodium bicarbonate showed a noticeable anti-candida effect on the concentrations of 105 and 106 CFU/mL, with almost similar anti-candida effect as nystatin and chlorehexidine(P=0.29, P=0.32). Nystatin was the most effective medication on the concentration of 107 CFU/mL of candida (P=0.03, P=0.01). Sodium bicarbonate and chlorhexidine were less effective in this concentration with no statistically significant difference (P=1.00).

Conclusion: Sodium bicarbonate showed a significant anti-candida effect at low and medium concentrations of Candida albicans, but nystatin was more effective in the higher concentrations.

Pooya Jannati, Mohammad Ebrahimi Saravi, Tahmineh Bamdadian, Farhad Sobouti, Sahar Cheperli, Jamshid Yazdani Charati, Nasrin Khaki, Sahba Amini, Abbas Mesgarani,
Volume 32, Issue 4 (1-2020)

Background and Aims: One of the most important challenges for dentists is providing a crown with appropriate marginal fit and gap. The 135-degree tooth preparation found to have some advantages such as technical ease and appropriate finish line record. Despite the advantages of 135-degree tooth preparation, scant research has been done in this area. Therefore, the aim of this study was to compare 135-degree and deep chamfer tooth preparation on the marginal fit and marginal gap of posterior metal-ceramic crowns.
Materials and Methods: Deep chamfer and 135-degree tooth preparation were performed on the two first mandibular molars with healthy coronal tissue and similar size. Impression was taken from each tooth and 30 crowns were made on each die. The sample plastered with fit checkers were pressed under the force of 40 N for 3 min in a universal testing machine. They were measured and recorded under a loop with 40x power in three points on each aspect. Data were analyzed by Wilcoxon and Kolmogorov-Smirnov tests using SPSS version 24.
Results: The mean marginal fit values in deep chamfer and 135-degree were 48.5417µm and 55.3333 µm, respectively with no statistically significant difference (P>0.05). While the mean marginal gap in deep chamfer (2.4833 µm) was significantly higher (P<0.05) than 135-degree (1.0083).
Conclusion: It can be concluded that the marginal gap by 135-degree’s tooth preparation was lower than that of deep chamfer in metal-ceramic crowns. However, no significant difference in the marginal fit between the deep chamfer and 135-degree tooth preparation was found.

Zahra Pooraskari, , Hossein Hessari, Reza Yazdani,
Volume 33, Issue 4 (1-2021)

Background and Aims: Pregnancy is a period with hormonal and psychological changes affecting women’s oral health. The aim of present review study was to evaluate, elaborate and categorize factors affecting oral health status of pregnant women.
Materials and Methods: A literature search with the following keywords: pregnancy, “pregnant women”, “pregnant mothers” and “expectant mothers” , AND dentistry, “dental health” and “oral health” in PubMed and Scopus was performed from 2009 to 2019. Search results included 1435 articles which 467 duplicate studies were excluded. Finally, 30 articles were included in the study. Oral health outcomes were categorized and significant relationships with determinants and risk factors were reported.
Results: Most studies (70%) were performed cross-sectionally. Among the studied outcomes, dental visit, periodontal disease and dental caries were the most common. The most studied independent variables were socioeconomic factors and demographic factors, followed by behavioral and enabling factors. The lowest frequency was related to the systemic factors. Mothers’ education and age were examined more than other variables and in about 40% of studies had significant association with outcomes. Dental counseling was assessed in only 3 studies and in all three studies, the relationship with outcome was significant.
Conclusion: Socioeconomic, demographic and enabling factors could affect the oral health of pregnant women.

Azin Shishesaz, Reza Yazdani,
Volume 33, Issue 4 (1-2021)

Background and Aims: Child’s oral health is believed to be related with maternal dental fear and anxiety. The purpose of the present study was to evaluate the relationship between the demographic status and maternal dental fear and anxiety and its effect on child’s dental caries.
Materials and Methods: This descriptive and analytical study conducted among 374 mothers which had attended to pediatric department of Tehran University of Medical Sciences for their child’s dental treatments in 2019 were evaluated in the present study. In addition to dental fear survey (DFS) and modified dental anxiety survey (MDAS) questionnaires, demographic information, age, marital status, family income, and educational level of the mother was recorded. Dental visit frequency and previous negative experience were also recorded. DMFT/dmft (decayed, missed, filled teeth) of the children was recorded according to WHO criteria. To assess the relationship between the variables, Pearson correlation and multiple linear regression were used using SPSS25 software.
Results: The mean age of the mothers was 35.66±15.75. There was no relationship between maternal dental fear and anxiety and children’s dental caries status (P=0.738). There was no relationship between the mothers’ age and dental fear, and anxiety (P=0.943). Previous negative experience and education were related to the dental fear and anxiety (P=0.02).
Conclusion: dmft of the children was not correlated with the maternal dental fear and anxiety. Higher education which was related with less dental fear and anxiety. Previous negative experience is one of the major factors influencing the maternal dental fear and anxiety.

Farzad Imamverdy, Reza Yazdani,
Volume 35, Issue 0 (5-2022)

Background and Aims: The most effective way to maintain and improve oral health is tooth brushing to physically remove dental plaque. In this regard, this study was conducted to compare the efficiency of the usual method of each person in comparison with different methods of brushing to remove dental plaque.
Materials and Methods: This study was conducted in 2020, as a randomized and open clinical trial with 72 non-dental male and female students of Tehran University of Medical Sciences. In this study, the usual method of tooth brushing with Modified Bass and Scrub Horizontal methods after training was evaluated in two random groups with plaque and gingival indices. Plaque index as a percentage and gingival index as a number (numbers between 0-1 mild inflammation, 1.1-2 moderate inflammation, 2-3 severe inflammation) were reported. The results were analyzed using SPSS25 software and paired t-test and variance equality test.
Results: The efficiency of the usual tooth brushing method in comparison with the two Modified Bass and Scrub Horizontal methods using two indicators of dental plaque and gingival indices was not statistically significant (P>0.05). Each method alone after tooth brushing significantly removed dental plaque (P<0.05).
Conclusion: The results of this study showed that the efficiency of the usual method of tooth brushing compared to trained methods in removing dental plaque and reducing gingivitis in short-term evaluation was not statistically significant.

Fatemeh Mokhtarifatemeh Mokhtari, Mohammad Mohammadhoseini, Nooshin Fakhari, Alireza Yazdani Rostam,
Volume 35, Issue 0 (5-2022)

Background and Aims: The aim of this study was to investigate the tooth discoloration caused by cold ceramic compared to MTA Angelus in contact with the washing solutions such as sodium hypochlorite (NaOCl) and normal saline.
Materials and Methods: 50 samples of extracted human maxillary anterior teeth were selected. After preparing the access cavity, they were divided into 4 experimental groups and 1 control group (10 in each group). The access cavities of teeth in groups 2 and 4 were rinsed with 5.25% sodium hypochlorite and those in groups 1 and 3 were rinsed with normal saline. Then, after drying, 3 mm thickness of cold ceramic (groups 1 and 2) and MTA Angelus (groups 3 and 4) were placed in the access cavities of the teeth. After setting of the materials, all specimens were restored with a resin modified glass ionomer. Based on the CIE Lab system, each sample’s total color change (∆E) was obtained before, one, and 90 days after application. Data were statistically analyzed using the Wilcoxon test.
Results: According to the results, there was no statistically significant difference in the average tooth discoloration between the groups filled with cold ceramic and in different time periods (P>0.05). While, in the groups filled with MTA Angelus, the difference in the average tooth discoloration in 90 days after application was significantly higher than one day (P<0.05).
Conclusion: The results of this study showed that compared to MTA Angelus, cold ceramic causes less tooth discoloration over time and therefore, it can be suggested as a more suitable alternative endodontic cement than MTA Angelus.

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