Yalçin Ciftçi

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STATEMENT OF PROBLEM It is known that drying dental stones in a microwave oven can save time, but the strength of the material may be affected by different drying methods. PURPOSE This study evaluated the diametral tensile strength (DTS) of 5 type IV gypsum products at different time intervals using microwave and air-drying methods. MATERIAL AND METHOD(More)
In this study, the effect of various materials used in fabricating superstructures for implant-retained fixed partial dentures on stress distribution around implant tissues was investigated. Five different mathematical models consisting of 11,361 nodes and 54,598 elements were constructed to study porcelain, gold alloy, composite resin, reinforced composite(More)
The purpose of this study was to evaluate the changes in vertical and sagittal maxillomandibular relationship of the patients who had been wearing dentures for an extensive period. Fifteen edentulous patients (seven men and eight women; mean age 63.5 years) who had worn dentures for six to 16 years (mean 10 years) were selected for this study. New(More)
STATEMENT OF PROBLEM Microwave drying technique for investment materials is believed to be timesaving by accelerating the elimination of free water content. PURPOSE This study compared the diametral tensile strength of 4 investment materials used in removable partial denture framework fabrication. The investment materials were subjected to microwave and(More)
The aim of this study was to compare the microleakage behaviour of three restorative materials using the autoradiographic method. The study was accomplished in vitro using freshly extracted human molars and a Ca45 radioisotope and autoradiography. Twenty-seven molar teeth were divided into three experimental groups of seven specimens each. Class II cavities(More)
PURPOSE This study evaluated stress distribution in metal frameworks constructed on implants under masticatory forces using computer simulations. MATERIALS AND METHODS Three-dimensional finite element analysis was used to study four different veneering materials-metal framework combinations using Calcitek implants. The veneering materials used in the(More)
The role of water evaporation from the liquids of the cements were tested, and the effect of this loss on their strength was evaluated for 0, 10, 20 and 30 minute, intervals. After 30 minutes the evaporation of liquid from the cements was so high that they lost their luting consistency. The data suggests that the highest weight loss was with polycarboxylate(More)
PURPOSE The aim of this study was to evaluate the shear bond strength of four esthetic veneering materials on nickel-chromium (Ni-Cr) alloy. MATERIALS AND METHODS Forty square patterns (10 x 10 x 1.5 mm) were cast with Ni-Cr, divided equally into four groups, and received four treatments for veneering: conventional porcelain-fused-to-metal (PFM),(More)
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