Journal of Marmara University Dental Faculty最新文献

Autoimmune processes are said to play an active role in aetiology of Behçet's disease (BD), which is also known as a multisystem disease. In the treatment of this autoimmune disease, cyclosporin A (CyA) is used. Gingival hyperplasia (GH) is one of the important side effects that have been observed in some of the patients. We aimed to evaluate the CyA-induced gingival hyperplasia in BD patients. There were 3 study groups, each having 5 patients. In the first group displaying GH, mast cells were located between epithelial cells and in the connective tissue. Mast cell granules were in crystalline form and electron-dense cored form. Fibroblasts and plasma cells were present in the connective tissue. The second group did not display GH and the mast cells were similar to those in the first group. The third group, was the control group, in which the mast cells were located between the epithelial cells and connective tissue. Mast cell granules were in electron-dense cored form. We concluded that the development of CyA-induced gingival hyperplasia is determined mainly by individual sensitivity to CyA, because although both test groups which received CyA showed an increased number and activity of fibroblasts, only one group of patients developed GH.

The purpose of this investigation was to evaluate the efficiency of the FR-3 appliance on functional Cl III malocclusion cases. A total of 45 functional Cl III cases were chosen from a general clinic intake of which 25 were treated with the FR-3 appliance and 20 were untreated and were taken as a control group. Patients that were treated with FR-3 had the following characteristics: Cl III with maxillary deficiency; functional anterior cross-bite; absence of anterior open-bite; patients in mixed dentition. The mean age in the treatment group was 8.4 years 8.8 years in the control group. The observation period was one year for both groups. The results were as follows: Sagittal forward growth stimulation was not observed in the maxilla. Mandibular growth was redirected in the vertical direction. The SNB angle decreased in that the mandible rotated downward and backward. The ANB angle increased. There was an increase in total and lower anterior facial height and reduction in the overbite. Another skeletal change observed was the increase in the cranial flexure angle. Improved dental results were a significant amount of overjet increase and a decrease in the IMPA. There was also a beneficial effect on the soft tissue profile.

Periodontal diseases encompass a wide range of disease manifestations and processes from the mildest inflammation of gingiva to the most advanced destructive periodontitis with loss of attachment, bone tissue and teeth. No entirely satisfactory identification and classification exist in periodontitis especially for high risk early onset periodontitis (EOP) cases, because of insufficient knowledge about the aetiological and host factors and their overlapping clinical and laboratory features. In this study, the dermatoglyphics, which is a genetic test method, suggesting the modes of inheritances of hereditary diseases, was performed on 36 EOP and 20 adult periodontitis (AP) patients and 20 periodontally healthy individuals. The diagnostic value of this genetic test method, which is the study of the quantitative and qualitative characteristics of patterns of ridged skin, and the role of heredity on periodontal diseases are discussed.

A histologic study was conducted in 5 diabetic and 5 non-diabetic albino rabbits to determine the effect of experimentally induced diabetes upon the number of gingival plasma cells and lymphocytes in the absence and presence of local factors, and IgG, IgM and IgA levels of the four groups were compared with each other. In conclusion, local factors were primarily responsible for the increase of the gingival plasma cells and lymphocytes. There was no statistically significant difference between the diabetic and non-diabetic group in the absence of local factors. Also, there was no marked difference between the serum IgG, IgA and IgM levels of all groups.

Lymphoepithelial cyst is thought to arise from the entrapment of salivary epithelium in lymphoid aggregates during embryogenesis. Such lesions are not common. It has been noted that there is a close association between the oral mucosal lymphoid tissue and the secretory ducts of minor salivary glands which is recognized as "Duct-associated lymphoid tissue" (DALT). A case of lymphoepithelial cyst with histologically documented close proximity between the excretory ducts of the minor salivary gland and lymphoid tissue in the cyst wall suggesting a DALT-like structure is presented.

The relationship between dental procedures and infective endocarditis is well known. Therefore, in order to prevent infective endocarditis, pre-operative antibiotic prophylaxis is recommended. However, a total agreement has not been achieved regarding which dental procedures and specific heart diseases require prophylaxis. The aim of the present study is to review the latest concepts dealing with heart diseases regarding the choice of appropriate antibiotic regimen, determination of patients at risk of infective endocarditis and dental procedures which require pre-operative prophylaxis. Our review revealed that there is still some disagreement regarding the above concepts. We believe that dentists, especially periodontists, can play a significant role in the prevention of infective endocarditis following dental procedures, by giving more attention to the subject and also by alerting the infectious diseases/microbiology departments and related medical staff.

Dental procedures performed in the oral cavity, which normally harbours an intensive microflora, can cause bacteraemia and death may result from progressive cardiac damage or uncontrollable septicemia. Different approaches to infective endocarditis related prophylaxis were found, from periodontology departments from different countries. It is our opinion of that, periodontology departments must alert related departments regarding the importance of specific bacteria involved in periodontal disease in the development of infective endocarditis following dental procedures.

Two different rapid palatal expansion appliances were compared, using lateral cephalograms, anterio-posterior cephalograms and diagnostic models. The Haas appliance was used on ten patients and the Hyrax appliance on another ten. A difference in the effect of the two appliances was found only for the increase in intermolar distance. This difference could be the result of the different appliance design.

The fit of a metal-ceramic casting deteriorates during the firing of a porcelain facing. Although many factors have been reported as the cause of these distortion phenomena, studies of marginal distortion associated with firing metal-ceramic restorations have yielded mixed results. The effect of firing cycles on distortion of a metal-ceramic coping was examined on 0.5 mm thick palladium-copper copings with shoulder marginal finish lines. It was found that the distortion produced in the first stage of firing was greater than at other stages. The marginal distortion seen on the porcelain veneered margin was not significantly different from the distortion on the non-veneered margin. These two results demonstrate that thermal contraction stresses due to porcelain contraction are probably not the primary cause of coping distortion. The internal surfaces of the copings were examined for contamination with porcelain particles and porcelain contamination was detected with an energy dispersive spectrometer analysis. The distortion produced during the porcelain veneering procedure was due to porcelain contamination on the internal surfaces of the copings. A convenient method is necessary to remove porcelain from the internal surfaces of completed restorations.

The purpose of this study was to evaluate pulp reactions to cavities treated with Scotchbond Dual Cure, Gluma and Tenure dentine bonding agents in four adult dogs, at intervals of 7, 30 and 90 days. The reactions were compared with the results from a control group in which the cavities were treated with zinc oxide/eugenol cement. The results indicated that Scotchbond Dual Cure dentine bonding agent caused less pulp reaction than Gluma and Tenure dentine bonding agents. However, long-term (90 days) specimens showed that none of these three bonding agents caused any severe reaction. The recovery of the pulp and a thick layer of reparative dentine formation were found quite significant.