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

In this article effect of light exposure time on hardness of visible light cured composites with different microfiller ratios were investigated. For this purpose specimens with heights 1, 2, 3 mm and 6 mm in diameter were prepared. During the preparation of the specimens, half of the specimens were cured with visible light for 40 seconds and the other half for 60 seconds. Surface hardness values were measured from the top and bottom of the specimens immediately after the light source was removed with Barcol Hardness tester. Surface hardness were also measured 24 hours and 7 days later. Results were statistically evaluated.

Neurilemmoma, neurofibroma and neuroma are benign neoplasms of nerve tissue. These arise from components of the peripheral nerves. They are extremely rare within the jaws. Schwannoma or neurilemmoma may occur along the route of any of the peripheral cranial or sympathetic nerves. The source of origin is thought to be the schwann cells. Its appearance in oral and paraoral regions is not rare. Treatment is surgical and the prognosis is excellent. It has no tendency toward recurrence. Our schwannoma case is found noteworthy because of its localisation and subsequent complications and is presented to your concern.

In our study, cases where teeth with excessive crown loss served as abutments, where examined in Kennedy Class II modification 1, that have tooth and tissue support on removable partial dentures which were constructed with the same design. Our study aims to examine, how vertically directed forces are transmitted to the supporting tissues by using photoelastic method. Teeth with case post and core appliances were used as abutments for removable partial dentures. Vertical loading procedure following the construction of removable partial dentures with the same design, revealed distribution of force over dentulous and edentulous ridge areas. When a comparison between endodontically treated and sound abutment teeth, was made, we had the conclusion that teeth with excessive crown loss can successfully serve as abutments for partial dentures, because the results of our finding exhibited no significant difference.

The long term effectiveness of modified Widman flap and subgingival curettage techniques were evaluated in 21 patients who have chronic periodontitis. Individual acrylic reference plates and a color coded WHO probe were used for attachment level measurements. Attachment level changes which were determined in 3 rd, 6th, and 9th months calculated as percentage gain or loss of initial attachment level and compared statistically. Initially shallow pockets showed loss of attachment in both techniques. There was significant attachment gain in initially moderate and deep pockets. Accordingly, attachment gain occurred at facial, interproximal and oral surfaces with both techniques. It can be concluded that if the effective plaque control would be maintained post operatively, subgingival curettage is the first choice of method in the treatment of periodontal pockets.

For the chemical control of bacterial plaque, various oral rinses have been suggested. Oral rinses which have been used widely in dentistry for the treatment of periodontal disease were tested in this study. We investigated the effects of 4 national and 1 foreign commercially available oral rinses. Our study was headed to compare these oral rinses with CHx solution which has been accepted as a "+" control material. At the end of this study CHx was found to be the only effective solution. From those of tested, only Heksoral, a national brand, oral rinse and a foreign originated Veadent had very limited anti plaque effects.

In this article, a rare case of large myxofibroma of the mandible has been presented. The odontogenic myxoma originated from the mesenchym ise benign and can be arised from dental papilla, dental follicle or the periodontal ligament. Myxoma is mostly located in maxilla or mandible and accompanied by an unerupted tooth and can be seen in the second or third decade of the life. It is painless and uncapsulated and the growth of tumor is slow. Since it is uncapsulated, recurrence is about 25%. Myxoma can be confused radiologically with benign or malign lesions of jaws which are radiolucent in nature. Curretting, cauterization and resection are methods of treatment and the prognosis is good.

The fatigue behaviour of acrylic sheet specimens containing reinforcers were investigated. Three different kinds of reinforcers namely, stainless steel, aluminum reinforcer and three flex wire were used as strengtheners in acrylic resin sheets. The tests were carried out on alternating bending fatigue testing machine specially designed to test sheet specimens. By applying static and dynamic bending moments of any desired magnitude within the permissible capacity likits of the machine the fatigue lives of the specimens were determined. Experimental results showed that stainless steel strengtheners had a significant positive effect on the fatigue behaviour of acrylic resin.

Fluor preparations are effective agents to remove dentinal hypersensitivity. In this study the effects of %4 NaF, Bifluoride 12 and diamine silver fluoride (Saphoride) on dentin surface is evaluated with SEM. Prepared dentin surface was covered with smear layer and different crystal forms were observed on the dentin surface.

Our investigation included 6 patients who had undergone extensive surgery for eradication of neoplasms of the maxillae. Their surgical defects were similar and they had natural teeth on the unresected side. Two types of obturators were constructed for each patient, one being hollow-bulb and the other buccal flange. The hollow-bulb obturators had closed nasal sections extending as far superiorly as possible into the anterior and lateral aspects of the defect. Buccal flange obturators were constructed without closed hollow sections. Our study was designed to compare these obturators electromyographically. When the results were evaluated statistically, it was concluded that buccal flange obturators were superior to hollow-bulb obturators in stabilization and function.

In our study, we constructed fixed-removable partial prosthesis, which are supported by teeth and tissue for patients who exhibited extensive tissue loss. In these prosthesis the localization of the precision attachments on the bar and the stress conducted to the abutment teeth by changing the number of splinted teeth and inclination of the bar were compared with photoelastic analyses and the results were evaluated. The photoelastic material used was Araldite/B and its catalyst was HT 901 fitalic anhydrate. The models constructed with these materials were examined in photoelastic polariscope and fringes occurred due to the force applied were photographed and analyzed.