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

Mixing of certain types of dental materials may produce pulpal injury due to a series of chemical reactions giving way to an exothermic reaction. Three different dental cements; zinc phosphate, polycarboxilate and glass ionomer cements which may increase the intrapulpal temperature were investigated in the present study. The cements were mixed according to the manufacturers' instructions in one group, the liquid and powder ratios were increased by one portion in the other two groups. The intrapulpal temperature changed between 1.32-4.54 degrees C among the three test groups. The intrapulpal temperature rise was markedly influenced when the amount of powder and liquid ratios were changed.

In this research, 483 cases of intra osseous cyst treated in the Maxillofacial Surgery department of A.U. Dental Faculty has been examined. Out of these cases 15 have been non-odontogenic jaw cysts with and without epithelium. In this group 5 were nasopalatinal, 2 were median mandibular, 2 were median palatinal, 1 was globulomaxillary, 4 were solitary and 1 was a bone cyst. Non odontogenic cases have been elevated according to the differing classifications.

Rapidly increasing gold prices hastened the widespread use of non-precious alloys for ceramo-metal restorations. Especially base-metal alloys has been considerably improved and has shown much progress after a long period of study and use. Among these alloys, nickel-chromium and cobalt-chromium alloys are quite popular in our country, like in Europe and in U.S.A. Their physical properties are superior than noble-metal alloys which are used for ceramo-metal restorations. However, some questions arise in the dental literature about their corrosion resistance, biocompatibility and porcelain bonding properties. This article reviews the constituents, physical properties, porcelain bonding, biocompatibility and corrosion resistance of nickel-chromium and cobalt-chromium alloys.

AIDS is a disease that has a high percent of mortality, and its etiology is unknown. Its contamination is by blood and sperms, as a result of this, AIDS forms a dangerous for all people dealing with health and for dentists. In this report; AIDS's importance about dentistry and prevention of disease is told.

Intramuscular hemangiomas are distinct neoplasms originating within normal skeletal muscle. They represent less than I % of all hemangiomas and occur most frequently in the trunk of extremities, perhaps because of the larger muscle volume in these areas. They occasionally occur in the head and neck area and we present an unusual localisation of intramuscular hemangioma; M. Massetericus.

Plastic teeth are preferred as functional portions with acrylic denture base material. The resin teeth have become the integral part of the denture by their chemical bonding with the base. But several factors effect the bonding: faulty boil-out procedures, residual wax on ridge-laps of the teeth, careless application of tin-foil substitutes to the teeth. On the other hand, grinding the glossy ridge-lap surface, painting the teeth with monomer or a solvent, preparing retention grooves on the ridge-lap portion of the teeth effectively lock the teeth to the denture base. The purpose of this research was to evaluate the bond strengths of the acrylic resin teeth and denture base material with retention grooves on the ridge-lap portion of the teeth. As a result of this study, bond strength between resin teeth and the denture base material is increased by the mechanical retention applied on the ridge-lap portion of the teeth.

Tumor immunology has been studied in animal experiments. The studies of Prehn and Main in the year 1957, have been pioneer studies. The early diagnosis of cancer, the prognosis, proflaksia and treatment has been studied in several immunological experiments and is still being studied. In the investigations being made before the Second World War mostly the Conditions after the immunological answer has been studied from the beginning where the antigen enters the body and which organs and tissues the antigen enters, which cells do recognise and how the immunological answers is formed. By solving the secrets of the immunological system, oto-immunological, allergic diseases and cancer would be able to be treated easier it is possible that much more better results will be able to be reached with organ transformation.

The surgical treatment should be preferred for cleft palate patients in childhood. However, a prosthesis is favorable for some adult patients. The construction of prostheses are rather complicated for patients who require pharyngeal speech aid in addition to anterior prosthesis. Sound prosthodontic rules are valid in designing a speech aid prostheses. Often stability and retention increase is required for these prostheses. Furthermore, the velar and the pharyngeal sections should not interfere with the muscular activity of pharynx and/or tongue movements during speech and deglutition. This article describes the prosthodontic habilitation of congenital cleft palate patients by means of pharyngeal speech aid prosthesis.

In this article a moulding technique for porcelain work that can be used especially in full-mouth and multiple unit restorations, is presented. Through this technique, condensation of porcelain can be achieved properly and the firing shrinkage can be hold in a minimum level. The occlusal form can be controlled in the mouth by a provisional acrilic bridge. A multiple pieced acrilic mould is prepared from the impression taken on the provisional acrilic bridge and is used for building up the full-mouth restoration. It is concluded that this technique can be an alternative which enables us to achieve accurate occlusal form and well condensed porcelain structure.

Thermal behaviour of metal and porcelain against heat is an important factor in metal-porcelain bonding. For this reason thermal compatibility and the thermal expansion of metal and porcelain are some of the important subjects to be studied carefully. In this study, by means of dilatometric measurements, we determined the thermal expansion coefficients of metal alloy (Ivotect P) and porcelain (ITS-HTE, Ivoclar) which we use in routine practice. As a result we found that the porcelain has a nonlinear expansion as oppose to metal alloy and also the firing conditions affect the thermal expansion. In addition we observed that the thermal expansion coefficient of metal alloy had changed very little in repeated castings.