Person: TAĞTEKİN, DİLEK
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TAĞTEKİN
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DİLEK
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Publication Metadata only Caries detection with DIAGNOdent and ultrasound(MOSBY-ELSEVIER, 2008) TAĞTEKİN, DİLEK; Tagtekin, Dilek A.; Ozyoney, Guerol; Baseren, Messeret; Ando, Masatoshi; Hayran, Osman; Alpar, Reha; Gokalp, Saadet; Yanikoglu, Funda C.; Stookey, George K.Objective. The objective of this study was to evaluate the repeatability of 2 nondestructive caries detection methods, ultrasound (ULS) and DIAGNOdent, for the detection of approximal caries lesions, and to evaluate 2 tips provided for the DIAGNOdent. Study design. White/brown-spot lesions (n = 42) were captured by a digital camera, and measured by test methods and confocal laser scanning microscope (CLSM). Intra- and inter-observer reliability, accuracy, and Cohen's kappa and Spearman's rho statistics were used. Results. At DIAGNOdent, intra-observer agreements were 78.5%, 66.7% for A tip and 59.5%, 47.6% for B for 2 examiners, respectively. Accuracy of both tips was 50% for the first examiner; 45.3% for A and 47.6% for the B tip for the second examiner. All ULS measurements were accurate, reliable, and positively and significantly correlated between examiners. Conclusion. The A tip of the DIAGNOdent was found to be better than the B tip for the detection of enamel caries. All DIAGNOdent and ULS measurements were positive and significantly correlated for both examiners. Both methods demonstrated high repeatability and accuracy. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008; 106: 729-35)Publication Metadata only Accuracy of ultrasound measurement of progressive change in occlusal enamel thickness(MOSBY-ELSEVIER, 2005) TAĞTEKİN, DİLEK; Bozkurt, FO; Tagtekin, DA; Hayran, O; Stookey, GK; Yanikoglu, FCObjective. To evaluate the effectiveness of ultrasound on measuring the thickness of enamel in abrasion. Study design. Flat areas on occlusal surfaces of 20 premolar teeth were marked. Two initial ultrasonic measurements on marked areas were obtained by the first researcher. Then the tooth was measured in the axial direction with a compass. The cusp tips were abraded by an abrasive paper, then the second and third ultrasonic measurements were taken. The second researcher repeated the third ultrasonic measurement to evaluate the interobserver variation. All specimens were sectioned and the remaining enamel thickness was measured under polarized light microscope. Results. Pearson's correlation analysis showed a high level of intraobserver agreement for the ultrasonic measurements of the first researcher (r = .891, P < .000 initial; r = .690, P < .001 first abrasion; r = .885, P < .000 second abrasion). Third ultrasonic measurements of the first and second researchers were positively and significantly correlated with histological readings (r = .966, P < .000; r = .466, P = .039). Conclusions. The ultrasonic system used in this study was reliable in measuring enamel thickness.Publication Open Access Two-year Clinical Evaluation of IPS Empress II Ceramic Onlays/Inlays(OPERATIVE DENTISTRY INC, 2009-07-01) TAĞTEKİN, DİLEK; Tagtekin, D. A.; Ozyoney, G.; Yanikoglu, F.The stronger the ceramic material, the longer the restoration stays in the mouth. The current study evaluated the two-year clinical performance of a strong ceramic system, IPS Empress II, with increased strength on onlay/inlay restorations of molars. Teeth from 35 patients, including three premolars and 32 molars, were prepared for 28 onlay and seven inlay restorations with IPS Empress II ceramics. The restorations were cemented with a highly viscous, dual-curing luting composite cement (Bifix) and evaluated by two examiners using USPHS criteria at baseline (one week following insertion), six months, one year and two years. The baseline scores and recalls were assessed by Wilcoxon signed rank test. Statistically significant marginal discoloration at the Bravo level was found at the 12- and 24-month recalls (p=0.046). One debonding was statistically insignificant. No changes were observed with respect to anamnesis, such as any symptom from the TMJ or masticatory muscles. No restorations were replaced due to hypersensitivity or were missing at the two-year evaluation. Any wear on the restoration, antagonist tooth or any changes of proximal contacts were not observed. IPS Empress II Ceramics were found to be appropriate as onlay/inlay restorations for clinical use under the conditions of the current study.Publication Metadata only Selected characteristics of an Ormocer and a conventional hybrid resin composite(ELSEVIER SCI LTD, 2004) TAĞTEKİN, DİLEK; Tagtekin, DA; Yanikoglu, FC; Bozkurt, FO; Kologlu, B; Sur, HObjectives. The objective of this in vitro study was to evaluate surface roughness, hardness and wear resistance of an Ormocer (Admira), polymerized by a plasma arc system. A secondary objective was to investigate two placement technique bulk or incremental layers. Methods. Blocks from Admira and Amelogen (a microhybrid composite) were prepared in cylinders, 3 mm in diameter, and 2 and 5 mm in thickness (bulk or incrementally placed) and polymerized by a plasma arc and a conventional light system. Surface roughness measurements were taken by a Surface Profilometer on the top of the specimens. Vickers hardness measurements, with a load of 600 mN were taken on the top and bottom of 2 mm and top, intermediate and bottom of 5 mm thick specimens. For the wear test, specimes (8 mm in diameter and 2 mm in thickness) of Admira, Amelogen and amalgam were tested in a ball-on design, by circular movements of the antagonist (alumina ball; diameter 10 mm) under 10 N Load. For the statistical evaluation of the results of surface roughness, microhardness and wear test; a paired samples t-test and Kruskal-Wallis analysis of variance test, were performed. Results. Admira showed highest hardness values in all polymerization types at the top surface and this was statistically significant (p < 0.05). These highest hardness values were obtained with conventional polymerization (81.84 +/- 1.167 VHN). Meanwhile, the wear resistance of Admira was found to be higher than Amelogen (Wd(admira) = 0.024 +/- 0.00149 mm(3); Wd(amelogen) = 0.032 +/- 0.00075 mm(3)). However, Admira demonstrated the highest surface roughness value compared to Ametogen, with plasma arc 5 s (0.65 +/- 0.023 mum). Amelogen was found to have the lowest surface roughness value with conventional 40 s (0.45 +/- 0.012 mum). Significance. The results indicated that Ormocer, which was developed by Ormocer technology, demonstrated higher microhardness and wear resistance when compared to a hybrid composite; however, the polishability of Ormocer needs further investigation. Also the selection of visible tight activated composite resins exhibited higher surface microhardness values when polymerized with conventional rather than with plasma arc. (C) 2003 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Thickness measurement of worn molar cusps by ultrasound(KARGER, 2005) TAĞTEKİN, DİLEK; Tagtekin, DA; Ozturk, F; Lagerweij, M; Hayran, O; Stookey, GK; Yanikoglu, FCThis study aimed to evaluate the effectiveness of an ultrasonic system for in vitro measurement of cusp tips of human teeth. Each worn cusp of 12 molar teeth was measured with an industrial ultrasonic system. The teeth were sectioned and measured by polarized light microscopy. The ultrasonic measurements and histological readings were moderately correlated (r = 0.601, p < 0.01). The ultrasonic system used in this study seemed a promising method for measuring thickness of worn cusp tips of extracted human molar teeth. Copyright (C) 2005 S. Karger AG, Basel.