Journal of Mashhad Dental School
Year:2003 | Volume:26 | Issue:3-4|Papers Count:13

Introduction: The aim of this study was to evaluate the role of periodontal therapy on the improvement of metabolic control in diabetic patients.Materials and Methods: 10 diabetic patients with NIDDM (9 female and 1 male) with poor metabolic control (mean HbA1C = 11.1%), and mean age of 43.7 yrs. And mean diabetes duration of 7.4 yrs. All affected with moderare to severe chronic adult periodontitis were selected. The treatment included of scaling and root planning, extraction of hopeless teeth and periodontal flap surgery. The clinical measurements included of probing depth, clinical attachment level, plaque levels and bleeding on probing which were obtained at baseline as well as 18 weeks post treatment. Moreover, glycosylated hemoglobin (HbA1C) was measured at baseline and weeks 18 and 26. In addition, body mass index was measured at baseline and week 26.Results: Significant improvement was observed in clinical parameters between weeks 0 and 18, whereas no significant difference was observed in HbA1c of weeks 0, 18, and 26. However, a slight reduction in HbA1C was observed in week 26 as compared with week 0. Moreover, no significant correlation was observed between HbA1c and clinical parameters.Conclusion: Above findings indicate that surgical periodontal treatment is successful in diabetic patients, but no significant improvement in their diabetic metabolic control following periodontal therapy and other unknown factors might be involved. Further investigations with longer follow-up durations are warranted.

Introduction: Maxillofacial Fractures is an important problem of patients in the facial region . use of conventional Radiographic Techniques is very helpful in diagnosis and Treatment of this Fractures.The purpose of this study was to evaluate the radiographic findings of mandible and the middle third of the face fractures in Mashhad dental school patients.Materials and Methods: 46 patients with mandible and 1/3 mid face injures referred to Mashhad dental school were evaluated for one year. The data including age sex radiographic techniques clinical finding and fracture region were collected through a form.Results: 36 patients (%78.2) were male and 10 patients (%21.7) were female.The highest incidence was seen in the 3rd and 4th decades (%32.6) and the major cause of facial fractures was traffic accidents (%39.1).The most clinical sign observed was wound in the facial region (%52.2).The orthopantomogram was the most frequently used technique (%58.3) on the whole 72 fractures were observed among the patients condylar region was the most frequent region for fracture.Conclusion: in spite of high indication of C.T scan for fracture diagnosis, it is less recommended in Iran which may be due to high expenses. This study also revealed that the use of specific radiographic techniques was less frequent.

Introduction: Recurrent herpes simplex infection is usually benign and self-limiting disease, but in immunosupperssed patients it can be a chronic destructive process. The Aim of this study is to determine the role of Herpes simplex virus in formation of oral lesions in patients on cytotoxic therapy.Materials & Methods: In the present study, the incidence of oral herpes simplex virus infection was determined in 21 Patients with acute leukemia who hospitalized in hematology/oncology ward of Imam Reza hospital for chemotherapy.Results: Oral lesions occurred in 76 percent of all patients during the course of chemotherapy. HSV was the cause of 75 percent of all oral lesions.Conclusion: This study showed that herpes simplex infection should be ruled out as an important cause of oral lesion in all patients who are on cytotoxic therapy.

Introduction: One of the main purposes of osteotomy is improvement in function and stability after orthognathic surgery. Today with use rigid internal fixation, this function and stability reach to best reasons, but a few complications are appeared, the purpose of this study was to evaluate this situation. Materials and Methods: The study sample consisted of 52 patients who underwent lefort I osteotomy at oral and maxillofacial department between 1998 and 2000. All patients in the study were treated with internal fixation using 2.0 mm plates and screws. All patients were fallowed for 14 months after surgery. Results: 1) A total of 208 plates and screws were placed in 52 patients, 9 (6 female, 3 men) had at least a portion of hardware removed. 2) The percentage of titanium plates removed was greater than the other plates. 3) The reasons for removal include: Palpation by patient, sinusitis, pain - infection, temperature Sensitivity, pain of palption, pain, infection and unknown. Conclusion: Only a small number patient develop complication from plates or screws (16%) that required their removal. In each case after removal of plates and screws, all complication was disappeared.

Introduction: The diagnostic craniometric method has been suggested for determining occlusal vertical dimension. The purpose of this study is finding a more accurate method for determing vertical dimension of face. Materials & Methods: One Hundred men and 20 women participated in this study. This study established the proportion between ear-eye to chin-nose distance for determining reasonable occlusal vertical dimension.Result and Conclusion: The results revealed that in spite of acceptable. (pearsons product moment correlation coefficient) the ear-eye distance cannot be used to predict chin-nose distance with reasonable accuracy. However (together with the other methods) it can be helpful as a guide for determining occlusal vertical dimension.

Introduction: The aim of this study is to estimate the amount of Dental Fluorosis amongst 15-year-old high school students of Quchan and rural district of Titkanloo (30 kilometers west of Quchan).Materials and Methods: In this cross sectional study, 900,15 years old students (600 boys and girls in town, and 300 boys and girls in rural district of Titkanloo) were selected randomly and were examined for dental caries and fluorosis. Results: 1) The percentage prevalence of fluorosis in 15- year-old students of Quchan was 32% and in rural district of Titkanloo was 95.33%2) The percentage prevalence of fluorosis among the girls in Quchan was 33.67% and boys 30.34%, these figures were 97.34% and 93.34% for rural Titkanloo respectively.3)The high amount of fluorosis in Titkanloo is probably due to great amounts of fluorine in drinking water in Titkanloo (1.7ppm) in comparison with Quchan (0.7ppm)4)This study also showed that the prevalence of dental fluorosis in Quchan (32%) and Titkanloo (95.33%) is greater than Mashhad (5.6%), Birjand (3.9%) and Shahrood (4.5%).- The mean DMFT of 15-year-old students in Quchan was 2.98 The high prevalence of fluorosis in Quchan and Titkanloo maybe explained as follows:1)The concentration of Fluorine (F) in drinking water was 0.7 ppm in town and 1.7 ppm in Village.2)Quchan and Titkanloo are placed geographically in a plain smooth and flat and the edge of Atrak riverbed slows down ,Thus the concentration of F ions increases in the water. 3) The people of these regions use local products full of fluorine (such as vegetables, fruits, dairy products, corns, grains, cereals.

Introduction: Surgical and non surgical endodontic treatment of open apex teeth is very difficult and sometimes is impractical. The usage of a something such as Ca(OH)2 or Hydroxy apatite to produce a plug in apical area of open apex tooth is a proper treatment. The purpose of this study was to evaluate the repair of the lesion by the apical plug of hydroxy apatitte in cats open apex teeth radiographically.Materials & Methods: 84 canine teeth from 21 cats were selected in this study. After preparing the canals of 68 teeth from experimental group and producing open apex teeth and lesion in periapex, one visit apexification with 2-3mm apical plug of hydroxy appatite and vertical compaction filling was done.Results: Radiographic evaluation was done in 2 intervals of 3 and 6 months and after 3 months %31.3 of lesion became smaller and %43.8 of lesion showed complete repair and after months %36 of lesion became smaller and %44.4 happened complete repair.Conclusion: These finding suggest hydroxy appatitle for producing a good apical barrier, that osteoinductive property is praper for osteosynthesis and repairing the lesion

Introduction: The purpose of this study was the evaluation and comparison of histological responses of dental pulp toward three different materials inserted directly over exposed pulp of canines cats. Materials & Methods: In this study, thirty-two teeth were used as experimental and 2 teeth as control group (intact pulp). Similar cavities were prepared and their centers mechanically exposed. Exposure sites were capped with Dycal, Mineral Trioxide Aggregate (MTA) and Scotchbond Multi Purpose (MP), and filled by composite acid etch.In periods of 7 and 70 days, animals were sacrified and 5 micron sections prepared. The samples were evaluated under light microscope, and the data analyzed by Kruskal Wallis (ANOVA) with %95 significance level.Results: In 7 day samples, there were no significance differences in inflammation among the material tested (P=0.12). No dentine bridge was observed in 7 day groups. In 70 day samples, there was no inflammation in %16.7 of MTA groups. No significance differences were found between three groups for inflammation (P=0.69). Dentin bridges were observed in %50 of MTA, %40 of Dycal and %20 of Scotchbond samples. These differences weren’t significance (P=0.85). Conclusion: These findings support the use of MTA and Scotchbond MP as direct pulp capping materials.

Introduction: This study was evaluating the etched bridge to enamel bond strength by different types of chemical surface treatments with two adhesives.Materials and Method: 144 sound canines were selected. After cleaning and mounting with self cure acrylic resin in molds, rectangular plates with 9mm2 surface areas and 0.5 mm thickness and with one process in mid part of the each one, were created. Fitting surfaces of all samples, were sand blasted. The specimens were divided to four groups of 36 based on type of chemical solutions. A): 50% V nitric acid-25%V hydrochloric acid- 25% V methanol. B): 18% V hydrochloric acid. C): 50% V, phosphoric acid, 25%V hydrochloric acid, 25% V, methanol. D): 3% w sulfuric acid, 1%w potassium permangenate. Then each of groups was divided to two groups of 18 based on two types of adhesives. Scotch Bond Multipurpose (3M-CO) and One Coat Bond (Coltene). And finally were adhered by dual cure resin cement Duocement (Coltene). After 1000 thermal cycling, shear test was done by crosshead speed of 2mm/min.Statistical analysis were done by two way ANOVA with 95% significance level.Results:1- Two factors (acid and adhesive), had no interaction.2. Type of acid hadn’t significant effect on bond strength. So four types of acids were as the same in bond strength. 3. Type of adhesive had not significant effect on bond strength. Therefore, two types of adhesives were as the same in bond strength.Conclusion: For surface treatment of Maryland bridge retainers, acidic solution and adhesives (one component and multi steps) are the same. Therefore it is better that select simple method.

Introduction: Alveolar bone has special importance in prosthodontics. Resorbtion of residael ridge initiates from teeth extraction and continuing during life. In addition of senile phenomena, mineralization of bone skeletal and the forces that is made from the dentures to the basel seat is also another factors of bone resorbtion. The purpose of this study was evaluation of relationship between serum level of phesphorous, calcium and alkalin- photase, age, sex and duration of denture wearing and ridge resorbtion.Materials & Methods: Thirty complete denture patient including 15 men and 15 women with the average age of 54 years, were selected and O.P.G. radiography was done. Mental foramen was reference point for evaluating of residual ridge resorbtion. So by measuring the ridge resorbtion the subject divided in to two groups. The first with minimal and second with severe resorbtion. Serum level of phosphorous, calcium oral alkalin phosphatase was measured from two groups.Results: The factors were evaluated and compared. Finally no significant difference was found between residual ridge resorbtion and amount of calcium, phosphar us, and alkalin phosphatase in both groups.Conclusion: Comparison study of these two groups showed that:It wasn’t any significant relationship between sex, age and alveolar bone resorbtion but it was significant relationship between the resorbtion and duration of wearing the dentures.

Introduction: When bilateral submandibular and sublingual and submental spaces become involved with an infection it is known as Ludwigs angina. It is usually observed after tooth extraction. The infection is often caused by a hemolytic streptococcus it may be mixture of aerobic and anerobic.The patient has a typical open mouth. The floor of mouth is elevated tongue is protruded and breathing is difficult.Results: Treatment consists of massive antibiotic (Penicilin with metronidazol) and corticostroide and maintain an air way and surgery.

The aim of this paper is to introduce different uses of magnets in orthodontic treatments. Since 1980s rare-earth magnets are used in various tooth movements for example space closure and forced eruption and extrusion of impacted teeth.Some studies have shown that the use of magnets makes tooth movement faster and with less pain and discomfort. But yet the use of this appliance is not proved to be convenient due to its expense and large volume.