Journal of Dental School
Year:2002 | Volume:20 | Issue:2|Papers Count:19

Aim: The purpose of this study was to evaluate the width of attached gingiva and the depth of gingivalsulces in permanent maxillary and mandibular teeth.Materials and Methods: this study was conducted on 230 male and female pupils, age ranged 12to 14years, in the ceity of Ghaem Shahr. Candidates were selected randomly and they divided into three groups. The width of attached gingiva was measured and recorded in provided forms. Data were then analyzed statistically.Result: this study showed that the width of attached gingiva was more in maxillary than mandibular teeth, in all three groups. However the pattern of attached gingiva width changes was similar in both jaws.There were no differences in the amount of attached gingival was greatest in maxillary lateral tooth and was least in lower premolar area.The amount of attached gingiva increased and sulcus depth decreased with age.Conclusion: The width of attached gingiva is in relationship with age and sex of the students and their parents level of education.

Background and Aim: This study was designed to assess the reasons for permanent tooth extractions in a sample of 1560 patients (863 male ,697 females) referred to the department of oral surgery in Kerman Dental School and7 other charity Dental clinics during the year 1999.Material and Methods: The method of study was descriptive and data collection was performed using a questionnaire associated with a clinical examination. A total of 156 patients (863 male and 697 female) were included in this investigation.Results: In total, 2030 extractions patients aged 9-76 years. Were recorded (55.3% in males and 44.7% in females). Mean of 1.3 extractions per patient was calculated in this population. Dental caries were found to be the most common cause for tooth extractions (27%) followed by, patient's request (3%), periodontal disease (19%), impaction (4.8%), occlusion problems (2.3%), orthodontic reasons (1.8%) and other reasons (19%). The most usual teeth to be extracted were the lower left first molar (125 teeth) and the least were the lower left canine, (10 teeth).Prosthodontic reason were the most usual reasons for tooth extractions among (38.5%), in patients aged 40 and above, while patient request were quite considerable, (32.3%).Conclusion: Dental caries, patient request, prosthetic reason and periodontal disease, were respectively the major reasons for extractions among both sexes.

Background: Drug induced gingival overgrowth (GO) was first described in 1939 in relation to anticonvulsive drugs. The introduction of cyclosporine (1983) and then in 1984 due to Since consumption of Ca channel blockers the problem has been reported frequently. Cyclosporine is the most effective drug known to prevent organ transplant.Aim: This study was designed to asses the prevalence of GO in cyclosporine consumers of renal transplant patients.Materials & Methods: In this study, 76 renal transplant patients were evaluated whow were referred to Bu-Ali Reference Laboratory (Tehran) to monitor the serum level of cyclosporine clinically. They were divided in to two groups (case & control) in terms of presence or absence of GO (no quantitative measurements of GO was described). Factors such as cyclosporine and creatinine serum level, daily dose of cyclosporine, duration of transplantation, age, sex, and concurrent consumption of Ca channel blockers were described retrospectively and compared between two groups.Results: GO was observed in 25% of patients while 75% had no sign of the problem. In general, GO sufferers were younger than the control group (8 years), the difference was also statistically significant (p=0.026). There was also a relationship between GO and simoltaneous usage of Ca channel blockers (p=0.04).Conclusion: There was no correlation between GO and factors like cyclosporine and creatinin serum levels, duration of transplantation, daily dose of cyclosporine and even sex.

Background: Odontogenic infections have a high prevalence requiring rapid diagnose is and treatment.Aims: This study was carried out to evaluate the knowledge, Attitude and Practice of dentists in relation to odontogenic infections at a group of private clinics in Tehran during the year 1999.Materials and Methods: This descriptive study was performed on 79 dentists taken in a systematic sampling method. The prepared questionnaire consisted of three parts, including knowledge, attitude and practice subjects.Dentists who answered only 1-3 of 8 questions correctly, were comprised as low score group, while those who answered 4-6 questions formed moderate and those who answered 7-8 questions were comprised as the high score group.Results: Findings of this investigation revealed that 74% of samples were placed at low grade, 33% at moderate grade and only 3% of them at high grade group for their knowledge assessment these data were at 59% for low score group, 37% for moderate and 4% for high score group when practice was measured.Conclusion: Developing training programs and extra education materials on odontogenic infections are useful in improving knowledge and practice of the general dental practitioners.

Background: There are many factors which contribute to the esthetic success of a dental restoration one of which is tooth selection.Aim: This study was designed to look at the relation between tooth and skin color.Materials and Methods: A group of 60 samples were included in this investigation with individuals as Judges. All of the cases and Judges were selected from dental students. The skin and the tooth color were devidedinto3 subgroups.Results: 30.5% of all samples had the subgroup I of tooth color and first subgroup of skin color.4.7%had subgroup 2 of tooth color and second subgroup of skin color. In the subgroup 3, there was no relationship between' tooth color and skin color. This study offers that the subgroup I of tooth color (The lightest colors) can be used in all 3 subgroups of skin color. There are many factors which contribute to the aesthetic success of a dental; restoration and one of the most important factors, is tooth selection. In this research we studied the relation between tooth color and skin color. This study wa completed with 60 samplesan6 Judges. All of them where, dentistry students. The skin and the tooth colors were divided in to 3 subgroups. 30.5% of all samples had the subgroup 1 of tooth color and first subgroup of skin color. 4.7% had subgroup 2 of tooth color and second subgroup of skin color.Conclusion There was no relationship between tooth color and skin color. The lightest colors can also be in all groups of skin color.

Aim: The purpose of this study was to determine the prevalence of soft tissue lesions among denture wearers and determine the relationship between this prevalence and age, sex, duration of wearing denture, denture teeth, occlusal balance.The studied lesions include inflammatory papillary hyperplasia, inflammatory fibrous hyperplasia, traumatic ulcer, denture stomatitis, angular cheillitis and flabby ridges.Materials and Methods: This study was a cross-sectional investigation with cluster random sampling. 350 denture wearers living in 5 different portions in the city of Hamedan were interviewed and clinically examined.Results: The total frequency of soft tissue lesions was 78.8% in all 350-denture wearers. The most frequent lesion was inflammatory fibrous hyperplasia (26.8%) and the lowest was angular cheillitis (2%).Conclusion: The result of this study indicated a correlation between non academic clinician, non occlusal balance, porcelain teeth, decreased and increased vertical dimension, overextention of flange, incorrect habits, poor denture hygiene and frequency of soft tissue lesions.

Background: Ameloblastoma an odontogenic tumor of ectodermal origin has been reported to arise, on rare occasions, in a primordial or dentigerous cyst of a young person. Numerous authors have suggested differing nomenclatures for these ameloblastomas and have sought to describe and classify the clinical and histopathologic features. These tumors have been characterized as a distinct variant exhibiting less aggressive behavior and a lower rate of recurrence than conventional ameloblastoma.Aims: This study was designed to look at the Human papilloma virus as a caurse for Ameloblastoma.Materials and Methods: Samples of Ameloblastoma tumors were traced from the filing system in path lab Beheshti Dental School. Using PCR technique a search was carried out to dated HPV in DNA of samples.Results: There was a clear relationship between the rates of HPV in Ameloblastoma cases.Conclusion: HPV could be a preparing factor for Ameloblastoma.

Background: There are still unclear points to indicate universally acceptable system for restoration of pulpless teeth.Aims: This study was performed to evaluate the effect of dentine bonded bases beneath amalgam on the fracture resistance of endodontically treated teeth.Materials and Methods: Seventy five sound maxillary premolar teeth were subjected to RCT associated with an MOD cavities preparation. Specimens were initially divided in to five groups as follows:a- Unrestored teeth as control group.b- Restored only with amalgam.c- Restored with composite resin with dentin bonding agent as base and these amalgam on top.d- Restored with compoglass as an adherent base and then amalgam.e- Restored with zinc phosphate cement as a non adherent base and amalgam.The thickness of the base was arranged in a way to allow a 2-3 mm thickness for amalgam. All restored specimens were subjected to an instron universal testing machine.Results: Fracture resistance of the first and second groups showed no significant differences, statistically.Conclusion: The use of dentin bonding agent (D.B.A) and composite resin as an adherent base beneath amalgam, increases the fracture resistance of endodontically treated teeth.

Background: Aphthous is considered as one of the most common diseases of the mouth and ulcer is characterized by the presence of single or multiple painful, recurring ulceration of the oral mucosa.Aim: The aim of this epidemiological evaluation was to determine the prevalence of aphthous lesions in Tehran province during the year 1996.Materials & Method: A group of 1440 individuals were selected through a systematic cluster random sampling manner. Cases were then divided into four age groups (7-12, 15-19, 35-44, 65-74) years.Results: Results indicated that the prevalence of aphthousis lesions in these age groups were 21.4%, 35.8%, 27.8%, 13.3% respectively.Conclusion: The presences of the affected patients are significantly higher in females than males. Environmental factors, such as economic conditions and smoking seemed to affect the prevalence of aphthous in all age groups.

Background: There are still differences and contradictions on the issue of impression techniques with and without any space for putty-wash impression materials.Aim: This study was designed to investigate the differences between two techniques of impression with and without specification.Materials and Methods: This quasi-experimental study was carried out using laboratory models. 10 impressions were taken for each technique and stone models were poured. Six dimensions of 20 models were measured and compared with laboratory model by the use oft-test analysis. The results are as follows:Results:These two technique has no statistical significant effect on die height. Impression technique without space in relation to impression technique with space causes die diameter reduction. Impression technique without space in relation to impression technique with Space causes increased distance between dies. Presence of undercut under the finishing line reinforces reduction in diameter in without space impression technique.Conclusion: Usage of impression technique with space in relation to impression technique without space is more preferable.

Aim: This study was carried out to assess caries Prevalence as well as the most effective factors in a group 0: school children aged 8 years in Tehran during 1999-2000.Materials and Methods: A total number of 1024 children were randomly selected. The level of Fluoride drinking water was assessed. In addition to the rate of dental caries, frequency of sugar consumption and fluoride supplements, Parents educational level, and Socio- economic status.Data was analysed using a Hest and a regression analysis.Results: Results indicate the mean fluoride level of drinking water to beat 0.3±0.13 PPM. The mean DMF5 was 1.5±1.5 and dmf score was 6.1±2.7.A decrease was seen in the rate of dental caries in children who had a higher level of parents education fathers occupation. Frequency of sugar consumption had a direct relationship with the rate of dental caries.Conclusion: A high prevalence of dental caries in this society was found in children mothers had lower Level education. being the most important factor involved.

Mucoepidermoid Carcinoma is a malignant salivary gland tumor and parotid is the most frequent site. This tumor is more common in females, between the ages of 20-70 years.It is also the most common malignant salivary gland tumor in children. Rarely, intrasseous type of tumor especially in the mandible has been reported. Although it has low malignant potential but it can metastasize to regional or distant lymph nodes.In recently reported case, the patient is a young man with a history of pain in and around the unerupted right third molar area in mandible. In microscopic findings, the tumor was a low-grade one and has been successfully treated by complete excision. Now after four years, furtunately there is no evidence of recurrence.

Background and Aim: Temporo mandibular joint is one of the most important joints of the human body. Some factors can affect the T.M.J and cause disfuntion leading to patient's discomfort. This survey was designed to assess the prevalence of signs and symptoms associated with different types of TMJ disorders.Materials and Methods: A group of 100 patients referred to Mashhad Dental School were selected whous are then examined for their TMJ disorders. Most of the patients were women, but no specific effort was made on certain sex selection.Results: Joint clicking was the most common complaint. The prevalence of internal derangements (disc displacement) was higher than masticatory muscle disorders.Conclusion: Prevalence of T.M.J disorders were found to be high with disc displacement being at highest.

Aim: The purpose of this study was to determine the prevalence of Ameloblastoma and its relationship to the age, sex, site of the tumor, modality of treatment and recurrence in a 10-year period.Materials and Methods: Patients who were referred to Taleghani Hospital, Tehran were selected for this investigation.Results: In total 50 lesions were detected. Most of the lesions were located in the mandible and multicystic type was the most frequent type. 2 cases were found to have had malignancy process. The rate of recurrence was 8% among all the reviewed cases.Conclusion: The type and extension of the lesions was different as well as the treatment which was varied from encleation to en-block resection.

Aim: The purpose of this study was to determine the prevalence of crossbite and the role of promary canines interferences as a predisposing factor.Materials and Methods: The sample group was 3-5 years old children from nursery schools in Tehran. 1355 children were randomly selected and examined.Results: The reresult showed that the prevalence of crossbite was %7.4 with confidence interval of %8.4-6.4 for %95.Among these children %4.4 had ant crossbite, %2.3 had unilateral post crossbite, %1.3 had bilateral post crossbite and %0.6 of total had both anterior and posterior crossbite. %66 of crossbite cases showed premature contact in primary canines.Conclusion:  Analysis of data with chi-square test showed that there is a significant relationship between unilateral posterior crossbite and primary canines interferences.