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  • Küçük Resim
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    Clinical evaluation of complications in implant-supported dentures: A 4-year retrospective study
    (International Scientific Information, Inc., 2017) Ülkü, Sabiha Zelal; Kaya, Filiz Acun; Uysal, Ersin; Gülsün, Belgin
    Background: Implants that can be used in the prosthetic rehabilitation of full and partial edentulous patients are now frequently used due to advances in dentistry. Despite advanced methods of applications, failures and complications can still be seen. The aim of our study was to evaluate clinical prosthetic values and complications that occurred during 4-year follow-up in implant-supported restorations. Material/Methods: This retrospective study included 40 patients who received oral rehabilitation with an implant-supported prosthesis. A total of 162 implants were placed: 99 in the maxilla and 63 in the mandible. The prosthetic and surgical data were recorded. Data including prosthetic complications and implant loss were recorded and statistically analyzed using Cox proportional hazard regression analysis. Results: In total, 159 implants (98.14%) survived, 3 implants (1.86%) failed, and 100% of the protheses were successful. There were 62 dental implants used as abutments for removable dentures and 97 for fixed dentures. The most frequent prosthetic complications after placement of an implant-supported prosthesis were loss of retention, mucositis, abutment screw loosening, and fracture. Patient satisfaction after prosthesis use was also evaluated, showing that satisfaction was systematically increased. Conclusions: To minimize the frequency of complications, protocols must be established from diagnosis to the completion of treatment and follow-up of implant-supported prostheses, especially in terms of adequate technical steps and careful radiographic evaluation of the components.
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    Evaluation of the stress distribution in the cortical bone caused by variations in implant applications in patients with bruxism: A three-dimensional finite element analysis
    (Uluslararası Diş Araştırmaları Birliği, 2021) Kantaci, Yakup; Ülkü, Sabiha Zelal
    Aim: To evaluate the stress distribution in the cortical bone under parafunctional forces with different occlusal thicknesses, monolithic zirconia with different implant diameters, and number variations in implant-supported fixed prosthetic restorations applied in patients with bruxism. Methodology: The tomographic sections of the previously registered mandible were used to model the mandible. Modeled bone height is 30 mm, cortical bone thickness is 1.5 mm, and trabecular bone thickness is modeled as 13 mm. By placing two implants in the created bone model, a three-member main model (Group 1), the number of implants was increased, three implants supported the Group 2 models, the diameter of the implants was increased, and the Group 3 models were created. The created Group 1, 2, 3 models, the occlusal thickness was divided into subgroups with 1.0, 1.5, and 2.0 mm, respectively (Groups A, B, and C). The groups were applied in two directions: vertical and 30o oblique. Stress values under forces were analyzed by finite element stress analysis. Results: Under vertical loading, the maximum principal stress value in the cortical bone was found to be lowest in Group 2C, and the highest maximum principal stress value was found in Group 1A. The minimum principal stress value in the cortical bone was found to be the lowest in Group 3C, and the highest minimum principal stress value was found in Group 1A. Under oblique loading, the maximum principal stress value in the cortical bone was found to be the lowest in Group 3C and the highest maximum principal stress value was found in Group 1A. The minimum principal stress value in the cortical bone was found to be lowest in Group 3C, and the highest minimum principal stress value was found in Group1A. Conclusion: Stresses caused by oblique forces are more than vertical forces. Increasing the occlusal thickness of the implant fixed prosthesis material, implant diameter, and number reduce the minimum and maximum principal stress values in the cortical.
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    Histologic effects of bilateral adrenalectomy under the light microscopy on rat mandibular condyle
    (2009) Ülkü, Sabiha Zelal; Zengingül, Ali İhsan; Ketani, Aydın
    The aim of this study was to compare the histologic findings from the condyles of rats with the general system findings. 30 Sprague-Dawley adult rats were used. The rats were sacrified and their condyles and femurs were examined histologically. The rats weight were observed weekly, their femoral height and weight, femoral mineral elements, and their daily food and water consumes were recorded. The results were analysed statistically by using SPSS (10.0). During the histologic examination of femur, the osteogenesis and calcification of the femur layers of the male/female rats in the experimental group were found to be lower than those of the ones in the control group. In addition to that, during the histological examination of condyle the level of thickness of condyle layers, the number of cellular elements, the osteogenesis and calcification seemed to be decreased for the male/female rats in the experimental group than for those in the control group. The decrease was found to be more significant for the female rats than the male rats in experimental group and it is thought that this is related to the gonad hormones. These findings emphasize that a reduction of sex hormone levels, induced by adrenalectomy, significantly influences condylar histogenesis.
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    Öğe
    Osteogenesis imperfektalı hastalarda protetik rehabilitasyon: 2 olgu sunumu*
    (2011) Ülkü, Sabiha Zelal
    Osteogenesis imperfekta (OI) veya camsı kemik hastalığı, artmış kemik kırılganlığı ve düşük kemik kitle indeksi ile karakterize, nadir görülen bir bağ doku hastalığıdır. Kalıtımsal metabolik hastalıkların genetik ve fenotipik olarak heterojen bir grubudur. OI hastaları tipik olarak kemik doku kırılganlığı, dentinogenesis imperfekta, mavi sklera, işitme kaybı, eklem laksisitesi, aşırı terleme, kısa boy, kolay ekimoz gelişmesi, kardiopulmoner anomaliler gösterirler. Semptomların sıklık ve şiddetleri hastalarda çok değişik derecelerdedir. Bu makalede kliniğimize 18 ve 22 yaşlarında başvuran iki erkek kardeşte görülen OI bulgularını değerlendirildi ve 7 yıllık takip raporlarının sunulması amaçlandı.