Journal of Mashhad Dental School
Year:2010 | Volume:34 | Issue:3 (74)|Papers Count:11

Introduction: Peripheral exophytic lesions are one of the most prevalent oral lesions and the most important cause of patients's referral to oral medicine department. Determination of frequency of oral peripheral exophytic lesions and demographic findings and clinical presentation can help us for diagnosing, prevention and management of them, so a retrospective 4-year study was carried out by purpose of determining the frequency of different types of peripheral exophytic lesions in patients referred to oral medicine department of Mashhad Dental School.Materials & Methods: Descriptive and retrospective study was done on files of 166 patients with peripheral exophytic lesions referred to oral medicine department of Mashhad Dental school from 2004-2007. Demographic (Age, sex …), clinical (size, number, location) and histopathological data were recorded and described by SPSS software and descriptive statistical analysis and table and charts prepared.Result: In our study, peripheral exophytic lesions were more frequent among females (F/M: 3/2). The mean age of patients was 40-60 years (33.5%). Gingiva was the most common location for exophytic lesions in oral cavity (44.0%). Inflammatory hyperplasia lesions were the most prevalent peripheral exophytic lesions and SCC was also the most common tumor in oral cavity. Duration in most of lesions (71.3%) was between 1 to 12 month and the most important chief complaint of patients was swelling (76.8%).Conclusion: Although most of epidemiological patterns of oral exophytic lesions were similar to other researches, this research revealed recording of clinical observations in patients' files was essential for epidemiologic studies and carefulness in clinical and histopathologic examination is necessary and leads to correct diagnosis.

Introduction: Periodontal disease has been implicated as a risk factor for systemic diseases. There was a association between periodontal disease and serum albumin level in recent studies. The aim of this study was to evaluate the serum albumin concentration as a prognostic marker of the periodontal disease.Materials & Methods: In this cross-sectional study, 64 patients with chronic periodontitis, aged 20-50 years and 64 healthy control subjects with same age were selected. Dental and systemic stata were assessed for all subjects. Blood samples (2cc) were collected and COBASMIRA method was used to determine serum albumin level. The data were analyzed by One- Way ANOVA, Chi- square and t-tests.Results: The mean serum albumin concentration was 5.05±2.7 gr/dl in chronic periodontitis and 4.40±0.39gr/dl in control group and the difference was significant (P=0.000). Also there was a significant difference in albumin level between mild and moderate periodontitis (P=0.000).Conclusion: Mean concentration of serum albumin level in periodontitis (mild, moderate, sever) was higher than control group.

Introduction: Following extraction of teeth the alveolar ridge resorbs and may result in inadequate bone volume for dental implant placement. The aim of this study was to make a histologic and morphometric analysis of the effect of using Bio-oss (a bovine derived xenograft) and Cerasorb (a b tricalcium phosphate synthetic material) in preventing or reducing the alveolar bone resorption following tooth extraction in comparison with empty sockets as untreated control in a dog model. Materials & Methods: In this interventional animal study, 5 healthy adult dogs were used. The 2nd and 3rd mandibular premolars were extracted after reflecting a surgical flap. Following random allocation, the available sockets either served as the untreated control (n=13) or received either Bio-oss (n=10) or Cerasorb (n=10) as test groups. An alginate impression was taken before the application of materials to fabricate a stone cast to serve as an index to make morphometric measurements. The healing events were uncomplicated and six months after the surgical procedures,the dogs were sacrificed and after removing the soft tissues ,another impression was taken from the mandibular hard tissues and the tissue blocks were prepared for histologic examination. Morphometric maesurments aimed to measure the changes in vertical dimentions of the buccal and lingual bony plates as well as the horizontal reduction of the ridge at the crest. The data were analyzed by ANOVA and Kruskal-Wallis test. The histologic evaluation included the examination of the quality of the harvested bone as well as the inspection for the presence of remnants of unresorbed biomaterials. Results: The mean changes of buccal and lingual crests and mean ridge reduction were not significantly different between control and cases groups. Histologic examination revealed that in all three groups, the cortical bony plates were thinner and of lower density at the buccal side compared to the lingual side. No trace of inflammatory cell infiltration was observed in any groups. In general, the histologic appearance of the 3 types of specimens resembled to normal lamellar bone.Conclusion: The results of this study showed that the vertical and horizontal resorbion of alveolar ridge following the extraction were minimal at three groups even at the untreated control sites.

Introduction: Bolton analysis is a good indicator to evaluate tooth size discrepancies but the ethnic variation of these values should be considered. Thus, the aim of this study was to determine the tooth ratios in different sexes and malocclusion groups in Iranian population and to compare these ratios with the data from the Bolton study. Also the best predictors of anterior and overall Bolton discrepancies were determined in this study.Materials & Methods: In this cross-sectional study, a total of 715 dental casts (526 female, 189 male) were recruited from department of orthodontics of Shiraz dental school and private offices of orthodontists. The samples were divided into three groups based on Angle’s Malocclusion groups. Then the greatest mesiodistal widths of all teeth were measured with digital caliper with accuracy of 0.01 mm and the anterior and overall ratios were calculated. Finally, the data were analyzed by Pearson Correlation, independent t-test and Kruskal-Wallis test, through SPSS software.Results: The anterior ratio (78.74%) and the overall ratio (91.94%) showed no statistically significant differences according to sex and malocclusion groups in south Iranian population. The results revealed that the correlation coefficient of lateral ratio with anterior Bolton discrepancy was 0.544 and central ratio with anterior Bolton discrepancy was 0.536. Also the correlation coefficient of first premolar ratio with overall Bolton discrepancy was 0.440 and the second premolar ratio with overall Bolton discrepancy was 0.407. Conclusion: The anterior ratio for the whole population was statistically different from Bolton’s, but no statistically significant difference was found for the overall ratio. In Iranian population, the best predictor of anterior Bolton discrepancy was lateral tooth and the best predictor of overall Bolton discrepancy was first premolar.

Introduction: Recurrent aphthous ulcers (RAS) are one of the most common painful diseases affecting the oral mucosa. The psychological-emotional factors should be considered as predisposing factors. However, the association between psychiatric disorders and RAS has not been fully investigated in Iranian population. The purpose of this study was to determine the type and frequency of psychological disorders in patients with aphthous ulceration. Materials & Methods: Thirty five subjects of 50 patients suffering from RAS referred to oral medicine department of Mashhad dental school were enrolled for this study. Demographic data and medical history as well as the number and type of the recurrent ulcers were obtained. The records of SCL90 questionnaire and interviews were analyzed by psychiatrist. Data obtained by personality evaluation and also the frequency of psychopathologic disease according to age, sex and duration of ulcers were described in tables and charts. Results: 65.7% of 35 subjects were female; the average age range was 21-30 years. 74.3% of patients had psychiatric disorders and the others were normal. The most common psychiatric disorder was concurrent minor depression and anxiety. Psychiatric disorders were most common among women. Conclusion: The current study revealed that majority of patients with aphthous ulcers have some kinds of psychiatric disorders especially anxiety, depression and obsession compulsion. The results of this study proposed that all the medical staff should consider psychological disorders as etiologic factors for aphthous ulcers during their work up and treatment.

Introduction: Dental porcelains have an important role in fabrication of the most beautiful restorations. Biocompatibility and translucency in ceramics make them one of the most agreeable restorative materials. Introduction of inceram system has been considered as a great change in the field of restoration. Inceram is made by two ways including Sprint technique and Conventional Method. The purpose of this study was comparing internal marginal gap in Sprint and conventional Alumina methods for making Inceram copings.Materials & Methods: In this in vitro study, 60-die resin-base with 6-millimeter length and 5-millimeter diameter in the cervical area were fabricated. They were prepared with a 10-degree, convergence angle and 1-millimeter shoulder width with 90-degree shoulder angle. The specimens were then divided into two groups. Next, in one 30-item group, the cores were prepared via Sprint method and in the other group, via conventional method (Alumina). After the cores were set, they were cemented by Panavia and for measuring the rate of internal gap, the specimens were examined via optical microscope Olympus BH60 with 1-micron precision. The data were compared statistically by students t-tests (a=0.05). Results: Examining the mean internal gap between two groups, it was revealed that the mean internal gap in the Sprint group (181.6 microns) was greater than Alumina group (114.2 microns) and the difference was significant (P=0.015). Conclusion: Considering the limitations of this study, marginal adaptation in Sprint method was less than conventional method of core fabricating (Alumina).

Introduction: Since bleaching causes changes on dental tissue and affects adhesive bond strengths, it is useful to recognize bonding systems which provide higher bond strengths on the dentin after bleaching. Materials & Methods: Forty eight human sound premolars were selected and sectioned 5mm below the CEJ. In order to do the bleaching process, the access cavity preparation was done and after the excavation of pulp tissue, and placement of the hybrid glass ionomer base at the apex, the teeth were bleached using the 35% hydrogen peroxide for 4 times. The teeth were then embedded in a self-cured acrylic resin and polished to obtain a flat dentin surface. The teeth were assigned into 4 groups according to the adhesive system used (n=12): group 1: Single Bond (SB), group 2: Prime & Bond NT (P&B), group 3: Clearfil SE Bond (CSE) and group 4: Opti Bond (All in one) (OB). The adhesive systems were used according to the manufacturer’s instructions and a cylinder of composite resin Z100 was overlied. The teeth were thermocycled and the shear bond strength tests were performed in a universal testing machine with cross head speed of 1mm/min. Results: CSE had the highest bond strength (15.18 MPa) and SB had the lowest one (8.10 MPa). One Way ANOVA and independent sample t-test showed that the difference in bond strength values among the different types or generations of bondings was statistically significant except for the SB and P&B systems (P<0.05). Conclusion: Within the limitations of this study, it is concluded that two step “self-etch” adhesives (CSE) are preferred to use for the teeth undergoing “Non vital tooth bleaching” with 35% hydrogen peroxide than the one step “self-etch” adhesives (OB) or two step “etch & rinse” adhesives (SB, P&B).

Introduction: Since compared to the fluoride gel, the fluoride varnish has received an increasing dentists’ attention, due to some additional advantages including simple application especially in young children and less chair time, this study was done to compare the fluoride varnish and gel in terms of salivary concentration and longevity.Materials & Methods: This clinical trial, approved by Islamic Azad University Khorasgan University of Medical Sciences, was conducted with the participation of 10 randomly selected ten 12-14 year old volunteer boys. The salivary fluoride concentration was measured four times, before, after 30 minutes, seven and ten hours after fluoride therapy with gel and after a two-week interval with fluoride varnish, using fluoride ion selective electrode method. The data were statistically analyzed using Repeated Measure ANOVA, t and Paired-t tests.Results: Thirty minutes and seven hours after fluoride therapy with varnish, salivary fluoride concentrations were significantly higher than that of the base. However, after 10 hours, it reached to the base level. On the other hand, in the gel group, the salivary fluoride concentration was significantly higher than that of the base only after 30 minutes of treatment and after seven and ten hours it reached to the base level again. Comparing the two groups, the fluoride concentration of saliva was significantly higher in varnish group than in gel group after 30 minutes and 7 hours of treatment. Conclusion: Salivary fluoride concentration after fluoride therapy with the varnish is significantly higher than fluoride therapy with the gel not only in terms of the quantity but also in terms of the longevity.

Introduction: The reconstruction of facial defect in patients has a great influence in improving social status and life expectancy. On the other hand, repair and reconstruction of facial defect has always been among the most difficult prosthetic treatments. Among the problems of this procedure are improper and movable underlying tissues, lack of retention in large prostheses, improper contour or color and patient's dissatisfaction and unacceptance. Nowadays implants can decrease these problems and provide retention possible for prosthesis reconstruction on the movable tissues and will increase the patient's satisfaction. The objective of this study was presenting a case of implant supported auricular prosthesis. Result: Traumatic 10 year old male who had been lost his right ear patient who had been referred to the department of removable prosthesis in dental school of Mashhad university of medical sciences.Conclusion: After recons follow by considering of esthetic and complication related prosthesis the auricular prosthesis was success.