Ankara Universitesi Dis Hekimligi Fakultesi dergisi = The Journal of the Dental Faculty of Ankara University最新文献

Our research was carried out on lateral cephalometric films, maxillary casts and hand-wrist films of 40 patients whose maxillary permanent teeth including the first molars of both sides were existing. These patients, 10 girls and 10 boys at prepubertal stage, and 10 girls and 10 boys at postpubertal stage, neither had an orthodontic treatment nor an adenoidectomy or tonsillectomy operation before. During our studies, hypertrophic tonsils, adenoids and other conditions which would have hindered the nasal respiration had not been detected. Naso-oropharyngeal area and palatal vault depth were measured on the lateral cephalometric films. Again, on the study casts measurements including the volume and depth of the palatal vault, as well as the width of the arch and length of the arch were taken. Comparisons between age groups and sexes were made by evaluating these measurements statistically with paired t-test. Using correlation analysis the relations between these factors were also investigated. Consequently our findings were evaluated in the light of recent publications in the literature.

Carrageenan is a high molecular weight sulfated polygalactose extracted from the marine algae and several biological and immunological properties. Carrageenan granuloma induced subcutaneously in guinea pigs has been widely used in connective tissue studies. Carrageenan is also commonly used as an excellent phylogistic agent for inducing experimental edema. In the present investigation carrageenan granuloma produced on the dorsum of guinea was compared with the inflammatory reaction produced in the cheek. The histopathologic investigations showed that the inflammatory reaction occurred in the buccal tissues was more powerful and the healing manifestations appeared earlier and continued more rapidly in the cheek.

The aim of the present study was to examine if a new connective tissue attachment is established following citric acid and tetracycline HCI treatment of roots, surgically deprived of its attachment apparatus. The 2. and 3. premolars of three dogs were used. After elevation of mucoperiostal flaps alveolar bone was removed extending a level of 2/3 of the roots. Then, teeth were treated with %1 citric acid PH 1 and Tetracycline HCI (Aquas solution) for 3 minutes and 4 teeth were used as control. After the 21 days of healing period the groups were evaluated histopathologically. The results indicate that citric acid and tetracycline treatment increase the amount of new attachment, inhibit the down growth of the dento gingival epithelium, allowing more time for the repopulation of periodontal ligament cells on the root surfaces.

The calcified structures that form within the parenchymal tissues or the canal of the salivatory glands are called salivatory stones or sialolithiasis. They contain calcium phosphate, 74.3%; calcium carbonate 11.1%; soluble salt, 6.2%; organic elements, 2.2% and water. The stones are formed by the precipitation of calcified structures around a nucleus that is made of the foreign bodies in the gland, desquamated epithelial cells, degradation products of the bacteria or the bacteria itself. 83% of the salivatory stones is found in the submandibular gland, 10% of them belongs to the parotid and the sublingual gland comes up with 7%. Aside from the major salivatory glands, the minor ones also contain stones. The stones can be classified as anterior, posterior and intraglandular according to the position. The unilateral stones, usually, when reached to the considerable size, cause to partial or total obstruction of the canals. We examined the two cases that have stones localized within the canals of submandibular gland when we were unable to use the sialography technique because of the obstruction the ultrasoundography was our other choice we had direct measurements of the stones and the gland both. After the operation a chemical analysis showed that the stones include calcium and magnesium as cations and phosphate and carbonate as anions.

Stabilization and retention of most of the mandibular full dentures constitute a serious problem for patients and dentists. In order to achieve a satisfactory level of retention and stabilization, we should try to save even the last remaining teeth in the mouth and use them as abutments for overdentures. In this article an overdenture application in which a laboratory made semi-precision attachment is used, presented in three cases. This attachment is spherical shaped stud attachment and has a female part made of clasp wire. The attachment is cheaper and easier to fabricate and it provides sufficient retention and stabilization for the dentures.

Recently some reports claim that mercury released from amalgam fillings cause adverse effect to the patient. Mercurial toxicity is a risk for dental personnel but it is completely preventable by using proper mercury hygiene. From the side of the patients, amount of mercury released from amalgam fillings is far to cause any adverse effect. The claims don't have scientific support. Hypersensitivity reactions to amalgam fillings are exceedingly rare. There is no alternative to dental amalgam in the posterior region and routine use of composite as an amalgam substitute can not be endorsed. Besides, when considered improved corrosion resistance and marginal endurance with high-copper types, amalgam is an effective and useful material.

In post-core applications, addition to the cast designs restorations that are performed on fabrication posts with restorative materials are being used. To improve the physical properties of glass-ionomer cements that are popular today, glass-cermet cements have been introduced and those materials have been proposed to be an alternative restorative material in post-core applications. In this study, the compressive resistance of Ketac-Silver as a core material was investigated comparatively with amalgam and composite resins.

Mast cells are the normal components of the connective tissues and they are found particularly in perivascular areas. They have a primary role in hypersensitivity reactions and inflamatuar process. They are found in whole healthy and inflamed periodontal tissues. Number of mast cells increase in some connective tissue tumors. However the roles of mast cells in fibrous gingival hyperplasias and giant cell granulomas of gingiva, is not clear. In this study, the number of mast cells were counted in both lesion groups. Numbers of mast cells were found increased on gingival fibrous hyperplasias, comparing to normal connective tissues and giant cell granulomas.

Today with the development of new restorative materials, the esthetic problems of the anterior teeth because of hypoplazies, fluorizes, fractures shape, form or color irregularities can be treated with conservative preventive and esthetic techniques such as bleaching, surface coating, cosmetic contouring and composite laminate veneering. These procedures are usefull adjuncts and economic alternatives to more extensive procedures such as crown applications. In this study, the young patients who have esthetic and psychologic problems due to color, form, shape, surface texture abnormalities and fractures of their anterior teeth were treated with bleaching, composite laminate veneer and cosmetic contouring techniques.