JOURNAL OF ISLAMIC DENTAL ASSOCIATION OF IRAN (MAJALLAH-I-DANDANPIZISHKI)
Year:2003 | Volume:15 | Issue:2 (45)|Papers Count:9

Mineral trioxide aggregate (MT A) is one of new materials that were introduced for apicectomy at first but today it is used many purposes in endodontics. This study is done because of importance of economical purposes in dental materials.The purpose of this study is to intraosseous reaction of foreign MTA (proroot) and Iranian MTA (Root) on parietal bone in rat.Twenty rats were divided into two groups of experiments (10 Rat).After anesthesia, one vertical incision in the ear diraciton was made and after making two defects in two sides of parietal bone, root and proroot were placed in them. Animals were sacrificed in 30 and 60 days time. After histopathologic preparation, H&E and von kossa staining, samples were evaluated for inflammation and osteogenesis.Results showed that in 30 days period there was less inflammation than 60 days period but osteogenesis was almost the same. As a whole there was no statistical difference in variables between groups.Root is an intraosseous biocompatible material like Pro root.

Lower molar replacement is one of the challenges in the field of dental implantolotgy. The aim of this study was the survival rate of the prosthesis attached to two dental implants (ILS) Neo-Dent system replacing a lower molar.The selected patients were healthy, non-smoker, lack of psycological disorders, lack of high patient expectations, lack of bruxism and poor oral hygiene. All dental implants were placed as delayed or delayed immediate replacement (after 10 weeks of extraction). For each molar 2 dental implants were placed. After 2.5 months the abutments were screwed, impressions were taken and the splint crown was cemented.Thirty eight dental implants were placed replacing 19 molars in the 15 patients with the mean age 45 (minimum of 18 and maximum of 64). Ten patients were women and five were men.The mean vertical bone loss after one year of loading was 0.2 mm with the minimum of zero and the maximum of 0.5 mm. All prosthesis did pass our criteria of success.Replacing the lower molars with two-dent screw type implant (ILS) is a successful approach.

Aim of this is clinical comparison of the effect of 2 mouth washer, chlorhexidine gluconate 0.2% and Persica, on plaque control after periodontal surgery.Form of the research was splith mouth single blind clinical trial. 66 patient (35 Femal and 31 male) with slowly progressive periodontits were selected. They had almost symmetric 6-7mm pocket depth.Their mean of age was 32, they didn't have any systemic disease.Field of examination was canine to second molar and side of test (Control or experimental) was selected randomally.Type of surgery was modified widman flap and patients dismissed without any antibiotics. In experimental group, used Persica, Twice in a day, each time lOcc, for 30 seconds and in control group chlorhexidine glauconate 0.2%, one bothel door, for 30 seconds. After one week, surgical pack removed and patients washed their mouth and then plaque index recorded.Date collected and analysis were done, they showed plaque index decreaserd 1.91 in experimental and 0.97 in control group. There was significant difference (P<0.0005) between groups. Control group had better effect in plaque control, but it produced stain 6.6 times, more than experimental group.plaque control is very important in the healing results. This research, showed chlorhexidine 0.2% mouth washer has significant effect, on plaque control and it is better than Persica.

Marginal discrepancy, is one of the problems with cemented casting restorations. Determining (evaluating) the amount of this gap is complex." However, minimal dimensions for these gaps have not been determined. It has been reported that a clinical acceptable marginal gap can be from 25µ to 120 µ.Most researches believe that a 100µ marginal discrepancy is clinically acceptable but it should diminish to 25 µ (cement film thickness) as it is possible.

Gingivitis, is the common form of gingival disease that is closely related to lack of oral hygiene.The aim of this study was to evaluate the prevalence of gingivitis and the oral hygiene status of primary school children in Yazd.This survay was a descriptive and cross sectional study which had been performed among 405, 8-11 years old school children chosen from, primary, school in two educational districts in Yazd by clustering random sampling.Periodontal status was assessed according to the criteria of gingival index (loe & sillness 1963) and the oral hygiene was evaluated by using simplified oral hygiene index (Greene & vermillion 1964).Prevalence of gingivtis was 100% among examind children the oral hygiene status has been evaluated moderate and the mean of OHI-S was 1.47±0.44. The girls had better oral hygiene and gingival status than boys, (P<0.0003 and in general the oral hygiene has improved with age. This research showed a-direct relationship between oral hygiene and prevalence of gingivitis.According to our finding, there is a general ignorance to the oral hygiene among school age children. There fore systematic oral hygiene education program must be performed in Iranian schools.

Gingivitis is referred to inflammation of gum and its main cause is dental plaque. Therefore plaque control has important role in prevention and treatment of gingivitis. Mechanical and chemical are two major methods of plaque control. Tooth brushing is the most common mechanical method of plaque control.Tooth brushes with different sizes and different thickness of bristles are made.Since single headed toothbrush are unable to remove the plaque from interproximal and lineangles of the tooth surfaces, double headed tooth brushes with curved bristles are designed. The aim of this research was to compare efficacy of single and double headed tooth brushes in plaque removal.15 dental students were chosen and they and they were asked to brush their teeth by Bass method of tooth brushing. Then, subjects used single headed and double headed toothbrush for two ulternate weeks. Before each step, subjects were asked not to brush their teeth for 48 hours. Plaque index was measured before and after each step of tooth brushing with single and double headed toothbrush. Results showed that plaque removal was more efficient in palatal, lingual and interproximal surfaces using double headed toothbrush in comparision to single headed toothbrush. This difference was not observed in buccal surfaces.

Those complications caused by removable dentures contain a wide range of oral mucosal lesions. The prevention of such lesions is in the responsibility of both dentist and patients. A descriptive cross-sectional study on 60 patients with complications of dentures consists; (35%) of 60 patients was male and (65%) was female 88.33% of 60 patients had used Acrylic complete denture. 77 denture induced lesions was observed in 60 patients. (55%) had epulis fissuratum, (38.33%) had denture stomatitis (23.33%) had angular chelitis, (8.33%) papillary hyperplsia of palate and (3.33%) had flabby ridge (38.33%) for construction of his/her denture went to a dental technician and (41.44%) to a (dentist). In this study, as overall, epulis fissuratum, denture stomatitis and angular chelitis have the most frequency, and a higher incidence in female at fifth and sixth decade.

Lichen planus is a common chronic inflammatory epidermal and mucosal disease involving skin, mucosa and both sometimes, the cause of which is poorly understood. Due to the importance and it's prevalence, this strudy was carried out in order to assess the association of oral and dermal lesions in patient referring to dermatology clinic of Tehran Razi Hospital during summer of 2001.A total of 101 patients with dermal or oral lesions of lichen planus were selected among 6510 patients had referred to Tehran Razi Hospital - dermatology clinic in this descriptive study. The selected cases were subjected to further and exact clinical examination along with interview, while in doubtful samples, the conducted histopatologic tests obtained by biopsy were used for the evaluation. A questionnaire was completed for each patient after taking history and physical examination including history of systemic diseases, intervening drug usage, smoking habits, presence of oral and dermal lesions, time passed from the appearance of dermal and oral lesions and the treatment period, oral lesions signs and the patients complaint, the position, the way and rate of distribution, oral lesion history as well as existence of amalgam restoration beside the lesion.The study revealed the 17.89 percent association of oral and dermal lesions in the study population, wile dermal lesion were observed in 80 percent of patints and oral lesions in 2.1 percent. The incidence of lichen planus oral lesion was slightly higher in females in comparsion to males (21.3 percent in females and 18.8 percent in males). 15.8 percent of oral LP pa tients were smoker and just one had history of pipe or tobacco smoking. Patients with dermal lichen planus reported a time between 1-6 months passing from their appearance, while the cases with oral lichen planus were unaware of the beginning time of lesions. The most reported symptom of oral lichen planus in the study population was burn of the place while the buccal mucosa was the place with the most common site of involvement and reticular form was the form of highly prevalence.There was no significant statistical relationship between smoking and amalgam restoration as risk factors and oral lichen planus appearance as well as with systemic disease such as diseases of liver, connective tissue, hypertension, diabetes mellitus, bone marrow transplantation and the usage of interventional drugs.High incidence of dermal and oral lichen planus association revealed throughout the study calls the attention for complete systemic examinations of the patients. As this study was carried out in the dermatology clinic, it seem that other studies in the dental schools as well as throughout the public will be of necessity and importance to verify the results.

The purpose of this study was comparison of oral mucosal pigmentation between smokers (S) and nonsmokers (NS).For this purpose one cross - sectional descriptive study preformed on 299 patients that had re coursed to oral medicine department of Yazd dentistry faculty (from lun 2000 to Dec 2000). In this population 59 was smokers and reminder was Ns. This sample included 152 M and 147 F (13-70 years old). The relationship between of oral mucosal pigmentation and smoking (number of cigarette per day, duration and demographic data of patients and location of pigmentation has been assessed.Prevalence of oral pigmentation was 50.2% (M=59.2%, F=40.8%, S=86.4%, Ns= 14.2%) The most common site of pigmentation in both groups was anterolabial gingiva (S=94.1%, NS=74.7%) This study confirmed a significant relationship between oral pigmentation and smoking.