Person: ÖZKAN, YASEMİN
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ÖZKAN
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YASEMİN
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Publication Metadata only The effect of different attachment systems with implant-retained overdentures on maximum bite force and EMG(WILEY, 2012) ÖZKAN, YASEMİN; Ucankale, Mert; Akoglu, Burcin; Ozkan, Yasar; Ozkan, Yasemin KulakObjective: To compare the effect of different attachment systems with implant-retained overdentures on maximum bite force and muscle activity using electromyography (EMG). Background: Denture retention and stability is of considerable interest in prosthetic dentistry. Materials and methods: Thirty-five patients were examined: 15 edentulous patients treated with mandibular implant-retained overdentures (MIRO) and maxillary dentures (MCD) (two implant-ball attachment) (BC); 10 edentulous patients treated with MIRO and MCD (four implants-bar attachments) (BRC); 10 patients with edentulous mandibular treated with MIRO and maxillary fixed partial dentures (MFPD) (two implant-ball attachments) (BF). Before implant placement all patients received new dentures. After using these dentures for 3 months the maximum bite force and electrical activity of masseter muscle were measured. Two or four implants were then inserted into the intraforaminal region. After osseointegration periods, patients were treated with MIRO which duplicated their dentures and after three months the measurements were repeated. The data were collected and statistically analysed. Results: Muscle activity and chewing ability increased in the second period of measurements. Also chewing time was significantly decreased at the first measurements. The highest muscle activity was observed in the group of patients treated with group BF. Conclusion: The EMG values of the masseter muscle significantly increased when an implant attachments was used in the overdenture.Publication Metadata only Fracture Resistance of Manually and CAD/CAM Manufactured Ceramic Onlays(WILEY-BLACKWELL, 2013) EVREN, BUKET; Yildiz, Coskun; Vanlioglu, Burcin Akoglu; Evren, Buket; Uludamar, Altay; Kulak-Ozkan, YaseminPurposeThis in vitro study aimed to evaluate fracture resistance in lithium disilicate onlays fabricated with IPS e.max Press and IPS e.max CAD systems and luted with different adhesive cements. Material and MethodsFifty maxillary first molars were prepared using a mesio-occluso-disto-lingual onlay cavity model. Ten onlays from each group were cemented using etch-and-rinse adhesives and high-viscosity composite resin cement, and 10 were cemented with self-adhesive, dual-curing universal resin cement. Fracture resistance was measured. ResultsSignificant differences were observed between resin cements (p < 0.05) and between materials (p < 0.05), but the interaction of these variables did not produce a significant difference. The fracture resistance of pressable ceramics was significantly higher than that of CAD/CAM onlays (p < 0.05), and Syntac Variolink was significantly higher than that of Multilink Sprint (p < 0.05). ConclusionAll groups showed clinically acceptable fracture strength results. According to the study, both the onlay fabrication system and adhesive cements can be a viable treatment option.Publication Metadata only Evaluation of the efficacy of different treatment modalities for painful temporomandibular disorders(CHURCHILL LIVINGSTONE, 2020) EVREN, BUKET; Abbasgholizadeh, Z. S.; Evren, B.; Ozkan, Y.The purpose of this study was to clinically evaluate the efficacies of three treatment methods and to compare their outcomes in patients with painful disc displacement. The study group comprised 45 patients with unilateral temporomandibular disorders who fell into Axis I group II (with limited mouth opening) of the Research Diagnostic Criteria for Temporomandibular Disorders. Magnetic resonance imaging was used for definitive diagnosis. The patients were divided randomly into three groups according to the treatment method: splint therapy, splint therapy with ultrasound-guided arthrocentesis, and splint therapy with low-level laser therapy. Patients were followed up after treatment for 6 months. The groups were compared in terms of pain and functional jaw movements (unassisted mouth opening without pain, maximum unassisted mouth opening, and contralateral movements). At the end of treatment, functional jaw movements were significantly increased while pain values were significantly decreased in all groups (P < 0.05). Group 2 had a quicker improvement in terms of mouth opening scores at the end of the first month, and unassisted mouth opening without pain was found to be more than 35 millimetres in all groups at the end of 6 months. All treatment modalities showed effective results on pain and functional jaw movements in the treatment of temporomandibular disorders.Publication Open Access Flexural properties of leucite and lithium disilicate ceramic materials after repeated firingst(ELSEVIER TAIWAN, 2014-06) GÖZNELİ, RİFAT; Gozneli, Rifat; Kazazoglu, Ender; Ozkan, YaseminBackground/purpose: Pressable all-ceramic materials are widely used in dentistry. Determining the effect of repeated firing on flexural strength will help to improve these materials so that they can remain resistant to fracture in restorative work. The aim of this study was to determine the change in the flexural strength of pressable all-ceramic materials after repeated firings, which may be unavoidable when color and shape corrections are necessary for use in dental restorations. Materials and methods: Forty disc specimens (15.5 mm x 2.1 mm) were prepared for each of four pressable ceramic materials (Empress 2, Finesse, Cergo, and Evopress) according to the manufacturers' instructions. Each group of specimens was tested for biaxial flexural strength (piston on three balls test) after the first (n = 10), third (n = 10), fifth (n = 10), and seventh (n = 10) firing periods. The data were analyzed using one-way analysis of variance. The Tukey multiple comparison test was then used to compare the strength of the different materials, and the Newman-Keuls multiple comparison test was used to compare the strength at each firing interval measured (alpha = 0.05). Results: The strengths of all of the pressable ceramic materials were decreased by repeated firings, especially after the seventh firing period, the only case in which the decrease was statistically significant. The flexural strength of the leucite-reinforced ceramic (Cergo) after the seventh firing was significantly lower than after the first firing (P = 0.04). The other materials were not significantly affected by repeated firings (P > 0.05). Conclusion: The number of firings does not appear to significantly affect the flexural strength of pressable all-ceramic materials. Copyright (C) 2013, Association for Dental Sciences of the Republic of China. Published by Elsevier Taiwan LLC. All rights reserved.Publication Metadata only Evaluating the additional effects of arthrocentesis on the condylar pathways of temporomandibular joint in patients with internal derangement treated with stabilizing splint(CHURCHILL LIVINGSTONE, 2014) GÖZNELİ, RİFAT; Yucel, Mehmet Ali; Gozneli, Rifat; Alkumru, Hasan Necdet; Kulak-Ozkan, YaseminObjectives: The purpose of this investigation is to find out the differences in the condylar pathways of the temporomandibular joint (TMJ) in patients treated with stabilizing splint and arthrocentesis accompanied by stabilizing splint in 6 months period. Study design: Forty patients who were assigned a clinical diagnosis of internal derangement of the TMJ were included in this study. Full arch stabilizing splints were made for all patients. Patients were divided into two groups; group A (patients who underwent arthrocentesis), group B (patients who did not underwent arthrocentesis). Computerized axiography was performed for each group before therapy (T-0), on the 3rd month (T-1), after arthrocentesis (T-A) (for group A) and on 6th month (T-2). Curve parameters were recorded in three-dimension; X axis (posteroanterior), Y axis (mediolateral), Z axis (superoinferior). Also the distance from the starting point of the movement on sagittal plane (S) was calculated. Results: There was a significant increase in the value of Z (p = 0.014) and S (p = 0.038) in mediotrusion movement in group A. Also, there was a significant increase in the value of Z (p = 0.007) in protrusion/retrusion movement, value of Z (p = 0.019) and S value (p = 0.002) in mediotrusion movement and value of Y in open/close movement in group B. Conclusions: No positive effects on condylar pathways of an additional arthrocentesis to splint therapy alone in patients with internal derangement were found in this study. (C) 2013 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Stud attachments used in tooth-supported overdenture(Springer Nature, 2023-11-01) ÖZKAN, YASEMİN; GÖZNELİ, RİFAT; Özkan Y., Gözneli R.Stud attachments are the most popular and most accessible type of attachments to be used primarily for overdenture among other attachments and available on the market for several decades. Stud attachments are placed directly on the tooth/root or attached (indirectly) to the cast copings for improving both retention and stability. They are straightforward to use and provide reasonable retention and stability for implant overdentures. Also, they are low in profile to reduce leverage upon the retaining abutments, are comfortable for the patient to maintain hygiene, allow independent physiologic movement of abutments, and are easy to repair. Stud attachments may be extraradicular or intraradicular and they may also be classified as resilient and rigid attachments. The resilient attachments permit some vertical and rotational movements on soft tissue for protecting the underlying abutments or implants against overload. Also, the resilient attachments permit vertical movement during mastication, reducing stress transfer to the abutments (stress-breaking function) and transmitting the forces to the residual ridge acting as stress transmitters. However, the resilient attachments usually require space and might cause posterior mandibular resorption with the vertical movement of the denture. On the other hand, the non-resilient (rigid) type does not permit any movement of the overdenture during the function.Publication Metadata only Retrospective Analysis of Lithium Disilicate Laminate Veneers Applied by Experienced Dentists: 10-Year Results(QUINTESSENCE PUBLISHING CO INC, 2019) ÖZKAN, YASEMİN; Asian, Yilmaz Umut; Uludamar, Altay; Ozkan, YaseminPurpose: To report on the 10-year clinical treatment outcomes for a strictly applied clinical protocol for pressable lithium disilicate glass-ceramic laminate veneers (LDLVs) placed by two experienced dentists. Materials and Methods: A 10-year follow-up assessment of 364 LDLVs placed in 41 patients was undertaken with the clinical criteria color/esthetic match of the porcelain surface, chipping and fracture occurrence, marginal discoloration, and integrity, assessed using the modified United States Public Health Service scoring system. Results: After 10 years, the survival rate was 97.4%. Complications occurred in 1.64% of the restorations (fractures and debonding in 0.55% and 1.09%, respectively). Conclusion: A strict, repeatable protocol for placing veneers with experienced dentists yielded good results.Publication Open Access Two-body wear of occlusal splint materials against different antagonists(BMC, 2020-12) ÖZKAN, YASEMİN; Yildiz Domanic, Kubra; Aslan, Yilmaz Umut; Ozkan, YaseminBackground This study aimed to demonstrate that the material of the occlusal splint can be chosen according to the needs of individual patients and contribute to the knowledge of the wear rate of these materials. Methods In this study, four occlusal splint materials (Sr Ivocap Heat Cured, Valplast, SR Ivocap Elastomer and Eclipse) and three antagonists (natural tooth enamel, inCoris TZI and IPS e.max Press ceramic materials) were used. Each wear test was performed using a chewing simulator (n = 16; test load: 50 N; number of cycles: 10,000, 20,000 and 30,000; continuous rinsing with water at 30 degrees C for the wet condition). The Shapiro Wilk test was used for normal distribution suitability. Antagonist on average wear quantities both main effects and interactions of material, cycle and condition factors were investigated by Univariate variance analysis. Multiple comparisons were examined using the Games-Howell test. Results There was a statistically significant effect of the difference in materials on the amount of wear (p < 0.001). Furthermore, there was a statistically significant difference among the mean values of all materials (p > 0.001). The highest mean value was obtained with Eclipse (0,318 mu m(3)), and the lowest mean value was obtained with Valplast (0,134 mu m(3)). Conclusion Our study found differences in the in vitro wear rate among various occlusal splint materials.Publication Metadata only COMPARISON OF DIFFERENT TREATMENT METHODS FOR LOCALIZED AND GENERALIZED SIMPLE DENTURE STOMATITIS(BLACKWELL SCIENCE LTD, 1995) KADİR, TANJU; ARIKAN, A; KULAK, Y; KADIR, TThe purpose of this study was to compare the treatment effects of fluconazole, fluconazole plus chlorhexidine and the fitting of new dentures upon the treatment of denture stomatitis and 15 subjects with clinical evidence of localized simple denture stomatitis were investigated clinically and mycologically. Patients with clinical evidence of generalized simple denture stomatitis were divided into three treatment groups. The first group was given 50 mg of fluconazole tablets daily for 2 weeks. The second group were instructed to apply chlorhexidine solution to the inner surface of the denture twice a day in addition to fluconazole treatment for 2 weeks. New dentures were constructed for the third group. Patients with clinical evidence of localized simple denture stomatitis were fitted new dentures without antifungal therapy. Palatal swabs were taken from each subject before, immediately after, and 2 weeks after the end of treatment, and the samples were examined mycologically in order to identify yeast colonies. It was found that for generalized simple denture stomatitis, treatment with fluconazole plus chlorhexidine resulted in better improvement of palatal inflammation than that by either fluconazole or the fitting of new dentures without medication, Whereas fitting new dentures did not reduce inflammation in patients with generalized simple denture stomatitis, the beneficial effects of prosthetic treatment were seen in patients with localized simple denture stomatitis.Publication Metadata only The effect of thermocycling on peel strength of six soft lining materials(BLACKWELL PUBLISHING LTD, 2002) ÖZKAN, YASEMİN; Sertgoz, A; Kulak, Y; Gedik, H; Taskonak, BThe bond strength of two heat-cured and four cold-cured soft lining materials was compared using a peeling test method before and after thermocycling. Tested soft lining materials were Molloplast B, Mollosil, Ufigel P, Ufigel C, Permaquick and Permaflex. Six specimens, 6.5 x 2 x 0.3 cm, for each group were prepared according to the manufacturers' instructions. Control groups were stored in a humidor for 24 h, whereas the others were thermocycled in a water bath between the 5 and 55 degreesC for 5000 cycles. Peel strength of samples were measured using an Instron Universal testing machine at a cross-head speed of 5 mm min(-1) . The types of failure were observed using an electron microscope. The highest peel bond strength values were calculated for Permaflex and Permaquick before and after thermocycling, respectively. Molloplast B, Mollosil, Ufigel P and Permaquick demonstrated an increase in peel strength after thermocycling, with Permaquick lining material having statistically significant increase. However, decrease in peel strength was observed for Ufigel C and Permaflex after thermocycling. Failure mode within the control groups was cohesive for Molloplast B, Permaquick and Permaflex, whereas adhesive for Ufigel P and Ufigel C. Mollosil demonstrated a mixed mode of failure for both thermocycled and control groups.