مجله تحقیق در علوم دندانپزشکی
سال هفتم شماره 2 (پیاپی 24، تابستان 1389)

The purpose of the present study was to compare the influence of primary and secondary closure of the surgical wound on postoperative pain and swelling after removal of impacted mandibular third molars.Materialsand This is randomized clinical trial study 10 patients with bilaterally impacted mandibular third molars were included in the present study. All the patients underwent surgical removal of the bilaterally impacted teeth at the same appointment. Primary closure (group I) was performed on one side and secondary closure (group II) was performed on the other side. All the patients were assessed for pain, trismus and swelling using the visual analog scale, and the data were collected and analyzed with the paired t test after 2 and 7 days.The swelling and pain in group I was greater than that in group II, with a statistically significant difference (P < 0.005). The trismus in group I was greater than that in group II, with a statistically significant difference after 7 days (P=0.03).Our results have shown that the patients in the secondary closure group experienced a significantly lesser amount of pain,trismus and swelling postoperatively compared the primary closure group.

Infraorbitalethmoid air cells are extensions of anterior ethmoid sinus into the floor of the orbit and superior aspect of the maxillary sinus. Such anatomical variations may result sinusitis, mucocele, retention cyst and headache. CT scan is commonly used for imaging infraorbitalethmoidcells. The aim of present study was: To determine the prevalence of infraorbitalethmoid cells on CT Image in patients over 6 years of age. Materialsand In this descriptive analytic study, 190 CT Cronal Images (91 women and 99 men) were examined for infraorbitalethmoid cells and their characteristics Other data such as age, sex, involved side, history or symptom of sinusitis, and sinus disorder were recordedusing a questionnaire Data analysis were done in spss statistical softwere by chi،squre test. Prevalance of infraorbitalethmoid (haller’s) cells on CT Image in patients older than 6 years were 11. 6% (12. 1% for men and 11% for women). There was no statistically significant difference between men and women. The most frequency related to patient who were between 41،50 years old (24. 1%) and the least frequent age was in patient under 20 years (0%). Unilateral involvements (9. 5%) were more than bilateral form (2. 1%) and there was statistically significant difference between right and left sides. two patients (9. 1%) with haller cells were multilocular, and 20 patients (90. 9%) with haller cells were unilocularview. There was a satistically significant difference in haller’s cell frequency between different shapes. ten patients (45. 5%) with haller cells had history or symptoms of sinusitis and 3 patients (13. 6%) with haller cells had retention cyst in CT Image. sixteen Patients (72. 7%) with haller cells had narrowing of Infandibuloum on CT Images. According to the result of this study and the prevalence of infraorbitalethmoid cells on CT Image, Identification of these cells can help the dental professional, to diagnoses orofacial pain with origin of sinus

Considering the number of dental graduates and the increasing trend of their concerns and goals of the educational program, a lack of information about This, and its related problems, the aim of this study was to evaluate student opinions on academic curriculum the following dental schools: Tehran University ofShahidBeheshti Islamic Azad university andShahedUniversity, from2001 to 2005. Materialsand This cross – sectional study was conducted on all graduated students. All students were asked to fill out questionarre, stating their opinion of their academic curriculum, the questionarre included topics and 10 variables which wear classified into 5 categories of completely, Moderately, slightlyand insufficiently adequate. Related variables, including school of dentistry and personal attributes were also taken into consideration and chi،2 statestical test was utilized for date analysis. Out of 1481 cases of dental graduated, study was conducted on 662 person Results of realization was 12. 3%, 27. 4%, 33. 6%, 14. 9%, 11. 8% for complete, high medium low very low respectively and there are 60. 3% of non realization and in this study. the most non realization was about Basic Sciences (71. 8%) and insufficiency of requirement (71. 6%) rate of realization was different in the universities and female and single graduated (that living with her family had more non realization) It seems non realization of curriculum and its related problems are worrisome and necessary performance for reduction of these problemsis recommended.

Salivary gland tumors are the uncommon neoplasms but are very important lesions in the head and neck area especially in adults. They divided into two benign and malignant groups these tumors usually do not have any sign and symptom until they become ulcerated. The aim of this study is to determine the frequency of salivary gland tumors in the archives of pathology department of Qazvin dental school and Ghods hospital of Qazvin university of medical science from 1999،2009 based on age, sex, location and histological types of the lesions. Materialsand

: This cross sectional study was conducted with pathology department of Qazvin dental school and head & neck surgery center of Qazvin University of medical sciences. All patients with salivary gland tumors who were admitted between 1999،2009 were assessed. The variable of age, sex, histological type of tumors and involvements were recorded and analyzed by spss and revealed as percent of prevalance.

out of 9761 records in the archives, 64 patient's including 32 males (50%) and 32 females (50%) with salivary gland tumors were evaluated. There were 67. 1% major salivary gland tumors and 32. 9%minor salivary gland tumors. Benign tumors (81. 2%) and malignant tumors (18. 8%) with the mean age 38. 6, 45. 83 years. Pleomorphic adenoma (70. 3 %) and mucoepidermorid carcinoma were the most benign and malignant salivary gland tumors. Parotid gland was the most area of involvement.

This study revealed that frequencies of salivary gland tumors were higher in age26،35 years, pleomorphic adenoma was the most prevatent benign and mucoepidermoid carcinoma was the most prevalent malignant salivary gland tumors. The prevalence of salivary gland tumors was higher in parotid followed by minorsalivary glands.

In regard to the prevalence of orthodontic treatments, the importance of relapse and complications followed by relapse are overlooked. This is further impacted by information gaps in Iranian Dental Journals and deficiencies in previous studies. In this study we have assessed the outcome of orthodontic treatment, relapse and related factors in patients in the Private orthodontic clinic inTehran in2009. Materialsand This study was performed using a cross sectional technique. The samples consisted of all patients with various kinds of malocclusions and the presence of pretreatment, post treatment dental casts with at least 4 years posttreatment. In these patients, we also prepared post retention dental casts. The indexes, including irregularity index, arch length, inter canine width, inter premolar width, and inter molar width in both upper and lower jaws were evaluated. The change in each index out of normal range indicated relapse. The role of related factors such as sex, patient’s age at the beginning of the treatment, type of treatment, duration of the treatment, the length of retention, the type of malocclusion, and family history were analyzed using ChiSquare test.This study was performed on 52 cases (26%) out of 200 cases which had complete records and positive response to recall. During the study period at least 500 patients were treated. The result of relapse was 61.5% without considering the irregularity index (42.3%).The most important relapse index was maxillary irregularity index (37%), followed by the mandibular irregularity index (17%) and, the least significant index was mandibular arch length (2%). Relapse was increased in patients with less than 24 months of treatment.(P<0.0001)Relapse was high regardless of irregularity index. Considering its complications, we suggest further studies to elucidate its etiology. This should be followed by preventive measures to decrease the rate of relapse.

Backgroundand PeriodontopathicbacteriasuchAggregatibacteractinomycetemcomitans (Aa), Porphyromonasgingivalis (Pg), Prevotellaintermedia (Pi) are considered to play a prime etiologic role in the initiation and development of the periodontitis, and the detection of periodontal pathogens before puberty may be helpful in identifying the children who need more effective oral health programs in order to minimize the risk of periodontal disease after puberty. The aim of the present study was to investigate the prevalence of periodontopathic microorganisms and periodontal status in children under 13ages. Materialsand This cross sectional study was performed onSixty systemically healthy children. All the subjects were enrolled with parent consent. Clinical examinations consisted of Plaque index (PI), Gingival index (GI) and Bone Level. Prior to any clinical measurements plaque samples were collected from sub and supra the gingival sites of the first permanent molars or the second primary molars in the absence of them, using a sterile curette. After that a sterile swab was used to obtain the samples from the buccal mucosa and the dorsum of the tongue. The samples were cultured, afterpooling, for the presence of the bacteria, using API،ZYM system. prevalance of periodontal idisease and related bacteria was evaluated and their correlation wastested by chi،square. Out of 60 studies children, 40% contaminated with periodontopathogenBacteria, 38/3% of subjects were positive for the presence of Aa, 30% of case had mild to moderate gingival inflammation there is a significant relation between increasing age over 6 years and the prevalence of this bacteria. According to the results of this study, there is a high prevalence of Aa colonization in children under 13 in studied population, and this is significantly associated with the ages of the subjects.

Posts are used as retention mechanism in repairing fractured or missing crowns of teeth. Nowadays composite fiber postes have eliminated most disadvantages of prefabricated metal and casting posts. the purpose of this study is to compare the amount of fracture resistance in three fiber posts (carbon fiber, quartzfiber, glass fiber) while shearing force (perpendicular to long axis) is applied. Materialsand This invitro, experimental study was performed on 30 maxillary lncisors with the same size without fracture, dentin caries or any root problems they were in three groups randomly. (Carbonfiber, quartzfiber, glassfiber) After root canal treatment and post space preparation with specified drill, samples were carried under universal test machine (prinston) to evaluate the amount of fracture resistance Data was analyzed with Kruskall،wallis Test under spss13. There was significant difference in fracture resistance in all three groups. (P=0. 001). Also, the carbon fiber posts had the maximum & the glass fiber posts had the minimum amount of fracture resistance. since the carbon fiber posts have the maximum fracture resistance in comparison with other groups, their application in anterior teeth is preferred.

There has been numerous different reports regarding the level of fluoride in drinking water of various parts of the country. the effect of water Felouridation on dental caries and flourosis is unclear. this study was done with the aim to evaluate the levels of fluoride in drinking water sources of the following cities in 2008: Neka, Jouybar and Savadkooh Thisdescriptire study was carried out on 395 residential districts including 236960 people. An updated list of all residential areas was obtaihed from the corresponding community Health center. A water sample of looce was obtained from each designated area and each sample was transferred to Islamic Azad University Laboratories for evaluation of fluoride levels (CI=95%). the amount offluoride in water Resources of Savad،kuh was equal to 0. 067±0. 01, Neka: 0. 185±0. 04 andJoibar 0. 27±0. 13. Flouride levels were low in all the areas. More research is suggested to determinethe effectof water fluoridation on dental caries and flourosis.

Metastatic tumors in the oral cavity account for about 1% of oral malignant tumors. They are mostly located in the mandible, predominantly in the molar region.All dentists and specialists must recognize oral metastatic lesions because they can be the first sign of an undiscovered malignancy, and also they can be easily mistaken with several different benign lesions. The aim of this study is to introduce a patient with metastatic follicular carcinoma of thyroid glandin the palate.Case Report:A 71 years old female was referred to a private office with chief complaint of halitosis. A tumoral mass was found in the hard palate on clinical examination. Destruction of floor of maxillary sinus and nasal fossa, destruction of lateral wall of nasal fossa and tumor bulging in soft tissue of palate were seen on the CT scan. After seeing the pathology slides and conversation with the patient, previous medical history of thyroid surgery in The UK about 12 years ago was found.Folow upof patient revealed, she died 4months later by extensive lung metastasis.