نشریه تحقیقات دندانپزشکی
سال چهارم شماره 1 (پیاپی 7، بهار 1394)

The use of internet makes it possible to access the newest scientific information. Hence, this study aimed at investigating university studentschr('39') use of internet in the dentistey school of Yazd in 2014.

This descriptive cross-sectional study was conducted on 384 students of Shahid Sadoughi Dentisty School in Yazd via census method in 2014. In addition, to collect the required data, a researcher-made questionnaire was applied. Which its reliabitilty and validity were confirmed. ANOVA, T-test, and Pearson correlation coefficient, were applied to statisticeally analyze the collected data.

A total of 167 men(43.5%) and 217women(56.5%)with a mean age of 25.88±5.9 years participated in this study. The lowest rate of daily internet use was 0.5 hour, and the maximum rate was 8 hours (2.67±2.54). The maximum rate of weekly internet use ranged from 1 to7 days with a mean of 5.39±1.7days. The study results demonstrated that the mean of  internet use was 39.28±08/8 out of 70 and mean of internet use skill score was  13.37±3.53 out of 25. Moreover, there was a significant difference (P=0.014) regarding the education level of the family head. A significant difference was also reported in terms of the internet use based on age(P=0.001), economic status(P=0.001),entry quotas(P=0.03), and the location of internet use(P=0.002). The low internet speed was expressed as the most important problem by 20.1% of students.

It is recommended to enhance the studentschr('39')skills by taking necessary steps such as attending related classes regularly. In addition, technical problems such as low speed shoud be solved

Almost 40% of cancer patients undergo the radiation therapy during their treatment. Therefore, the present study aimed to evaluate the knowledge of patients referring to Shahid Ramazanzade radiotherapy center concerning oral side effects of head and neck radiation therapy in 2014.

In this descriptive cross-sectional study, 180 patients who referred to Shahid Ramazanzade radiotherapy center, were selected by a simple random sampling method. The study data were gathered via a researcher-made questionnaire that its and reliability and validity have been confirmed. This questionnaire included 10 questions related to the patient’s knowledge with the maximum and minimume scores of “0” and “2” respectively. Scores of 0-6.99, 7-13.99, 14-20, respectively, demonstrated a poor, moderate and good levels of knowledge. The study data were analyzed using SPSS software (ver 17),  using ANOVA and T-test.

One hundred-eighty 21-88 years old patients with the mean age of 51.42±3.44 and age range of 21-88 attended in this study, of whome 110 (61.10%) were men and 70 (38.89%) were women. The knowledge mean score was 9.24±3.94  out of 20. Moreover, a significant statistical relationship was observed between the knowledge score of patients with their age (P=0.005) and education (P=0.0001), whereas no significant relationship was detected between the knowledge score and  gender of patients (P=0.502).

The findings of the present study revealed a moderate level of patients’ knowledge regarding the effects of radiotherapy on oral cavity. As a matter of fact, the knowledge level of patients was held to be lower in older patients, and patients with higher level of education gained a higher knowledge score.

Remaining of previous filling materials on the root canal walls can be stated as one of the reasons for retreatment failure. Chemical solvents are used for better  removal of the remaining materials. The present study aimed to compare the effectiveness of two solvents including Carvene and Chloroform in retreatment of root canals filled with Gutta-percha.

In this experimental in vitro study, 50 extracted human anterior teeth were prepared using step back technique and filled with Gutta-percha and AH26 using lateral condensation method. The teeth were divided into two groups of 25 and were retreated with Carvene and Chloroform. Bucco-lingual sections were prepared, the degree of remnant materials was evaluated by stereomicroscope and digital images were obtained. The amounts of Gutta-percha and sealer debris remnants on the one-third of the apical, middle and coronal areas of root canal were seperately calculated by Matlab software. The obtained data were analyzed using SPSS software (ver 16) applying t-test.

As the study results indicated, no statistically significant difference (P>0.05) was observed in regard with amount of the remained material between the two groups in one-third of the apical, middle and coronal. The mean of retreatment time for Chloroform and Carvene was 8.3 and 4 minutes respectively, which the difference was held to be statistically significant (P=0.000).

Although the chemical solvents (Chloroform and Carvene) were demonstrated to be similar in removing the Gutta-percha and sealer, Chloroform performed this action in a shorter period of time.

Today, dentistry is specially extended, which is due to the specialization of different branches of dentistry and students’ tendency toward specialty courses; ergo, the current study was designed to investigate the tendency of and Fisher exact test<span style="font-family:;" dir="RTL" new="" b="" roman";"="" "times="" roman";="" nazanin";="" 12pt;="" 11.0pt;="" lang="AR-SA">.

The majority of students (76.2%) were interested in continuing their specialized education. The students mentioned that obtaining higher clinical skills and knowledge, higher social opportunities, and more and better job opportunities were the most important factors in their tendency toward continuing specialized education. Inclination to work after graduation and tiredness of education were the most important factors of disinterests in continuing specialized education. Specialty fields which seemed most interesting to the students involved: Orthodontics (3.77%), Operative dentistry (4.34%), Endodontics (4.37%).

The findings of the present study revealed that the majority of dentistry students are interested in higher education to obtain higher clinical skills and knowledge as well as better social opportunities; and orthodontics was the first choice for most of them.

The incidence of hypodontia is frequently observed in the dental patients. Considering that a comparison of the prevalence of malocclusion in various racial and ethnic groups can lead us towards the etiology of malocclusion  and  guid us to appropriate prophylactic therapies, the current study aimed to investigate the relationship between hypodontia frequency and various malocclusions.

This retrospective study was conducted on 405 orthodontic patients with mean age of 15.8 and age range of 15-25 selected based on their diagnostic records who suffered from class I, II, and III skeletal malocclusions . Cephalometric Wits index and ANB angle criteria were used in order to divide the patients into class I (ANB>1-4 degrees), class II (ANB>4 degrees), and class III (ANB≤1 degree) malocclusion. To investigate the dental missing, panoramic radiographs and patientschr('39') records wereutilized. The gleaned data were submitted in to SPSS 17 and analyzed using T-test, ANOVA, and Chi-square tests.

In the present study, out of 405 patients, 251 (62%) patients were females and 154 (38%) were males. The prevalence rate of hypodontia in orthodontic patients was 14.56% with inclusion of the third molar and 5.16% with exclusion of the third molar tooth. The frequency of various types of hypodontia in class I malocclusion was significantly greater than other types of malocclusion (P (P.V =0.02)<span style="font-family:;" dir="RTL" roman";"="" new="" "times="" roman";="" nazanin";="" b="" 11.0pt;="" 14pt;="" lang="AR-SA">.

The academic status of the students is regarded as an important issue in the educational activities. Therefore, this study aimed to determine the effective factors on the academic achievement of dentistry students at Shahid Sadoughi University of Medical Sciences of Yazd.

This descriptive cross-Sectional study was carried out on 200 students from Shahid Sadoughi Dentistry School of Yazd in 2014 using the census method. All students with a GPA equal to or over 15 were considered as successful students and those with an average less than 14 were identified as unsuccessful students in regard with academic achievement. The study data were collected using a valid and reliable questionnaire, which were then analyzed using the SPSS software (ver 17) via Chi-Square test.

The results showed, a significant difference was observed between the two groups of students in terms of individual characteristics (such as gender, student status, place of residence, employment, smoking, family income, mother’s education level) and academic characteristics (such as time gap between high school graduation and entering the college, high school GPA, student ranking in Concourse exam, number of educational units completed and the educational failures)(P<0.05), while no significant difference was detected between the two groups in age, marital status, education as well as parents’ occupation (P>0.05).

The findings of the present study revealed that   successful and unsuccessful students are significantly different  in regard with individual and academic features. Moreover, the role of such factors as psycho-social factors are recommended to be evaluated in the future studies.

To investigate the relationship between radiolucent periapical lesions and bone mineral density in post-menopausal women that was referred to the Yazd Khatam-Al-Anbiya clinic in 2014.

In this Cross-sectional study was conducted. Fifty postmenopausal women with a mean age of 57.9±5.00 years and the average age of menopause is 49.6±2.49 years, the average  of bone density of -2.4±0.8 were used for this study. Bone mineral density was measured using dual-energy X-ray absorptiometry in three groups: healthy bone, osteopenic and osteoporotic. Periapicalradiolucencies were diagnosed on the basis of examination of digital panoramic radiographs and data collected by the software SPSS 17 and statistical test ANOVA and chi-squared tests, and t-test, and Fisher Exact test analysis.

The results showed a not significant relationship between bone mineral density and the ratio of the radiolucent periapical lesions to the total number of teeth (P-value=0.131). Also the relationship between the number of periapical radiolucent lesions with menopause age (P-value=0.428) and duration of menopause (P-value= 0.362) and bone mineral density with menopause age (P-value=0.916) was not significant. But the relationship between bone mineral density and duration of menopause was significant (P-value = 0.004).

The result of this study, cannot use the number of apical radiolucent lesions in panoramic radiography, as bone density index.

Diabetes is considered as one of the most common chronic diseases which this prevalence and incidence is increasing, particularly in the developing countries. Considering the high prevalence of diabetes in Yazd, its important role in oral complications and effect of dental treatment plans, community awareness to minimize the risk of complications plays an important role. Hence, this study aimed to evaluate the knowledge of patients referring to shahid sadoughi Dentistry school regarding diabetes and itchr('39')s complications.

In this cross-sectional study, 210 patients referring to the Dentistry school of shahid sadoughi were evaluated in 2011. In order to collect the study data, a questionnaire was applied, and then the collected data were analyzed by T-test, ANOVA by SPSS software (version 16).

The study participants consisted of males (35.7%) and females (64.3%) with an average age of 29.92±11.43. Based on the study results, the mean score of awareness was 8.44±5.25 out of 18 with a confidence level of 95%, and the mean score of attitude was 46.09±5.16 out of 100 with a confidence level of 95%.

This study findings demonstrated that level of knowledge and attitude of the patients referring to the Dentistry school of shahid sadoughi was reported to be low in regard with diabetes and its compilations. Accordingly, some strategies are needed in order to be considered to increase awareness of the signs and symptoms of diabetes at the Dentistry School.