Bu çalışmanın amacı, vital pulpa tedavilerinde kullanılan Medcem Saf Portland siman, Medcem MTA ve NeoM-TA'nın farklı pediatrik restoratif materyallere makaslama bağ dayanımını karşılaştırmaktır. Gereç ve Yöntemler: Makaslama bağ dayanım testi için standart akrilik bloklar (4*2 mm) hazırlandı. Üretici firmaların talimatları doğrultusunda hazırlanan kalsiyum silikat içerikli biyomateryaller (Medcem MTA, Medcem Saf Portland siman, NeoMTA) akrilik bloklardaki boşluklara yerleştirildi ve sertleşmeleri için önerilen sürelerde bekletildi. Restoratif materyaller 4 grupta (kompomer, rezin modifiye cam iyonomer siman, yüksek viskoziteli cam iyonomer siman, Cention N) değerlendirildi. Biyomateryallerin üzerine (2*2mm çapında) silindirik kalıplar yardımıyla restoratif materyaller uygulandı. Veriler, tek yönlü ANOVA ve Tukey testleri kullanılarak analiz edildi. Bulgular: Medcem Saf Portland siman ile en yüksek makaslama bağ dayanımı gösteren restoratif materyal grubu yüksek viskoziteli cam iyonomer siman grubu olurken, bunu sırasıyla kompomer, Cention N ve rezin modifiye cam iyonomer siman grupları izledi. Medcem MTA ile kompomer grubu arasındaki makaslama bağ dayanımı en yüksek olup, bunu sırasıyla Cention N, rezin modifiye cam iyonomer siman ve yüksek viskoziteli cam iyonomer siman grupları izlemiştir. NeoMTA'da ise makaslama bağ dayanımı en yüksek Cention N grubu ile, en düşük yüksek viskoziteli cam iyonomer siman grubu ile belirlendi. Sonuç: Bu çalışmada kullanılan biyomateryaller ile pediatrik restoratif materyaller arasındaki makaslama bağ dayanımı umut vericidir ve vital pulpa tedavilerinde alternatif olarak düşünülebilir.

We investigated the oral stereognostic ability (OSA) of dentate individuals, conventional complete denture patients, and maxillary implant-supported denture patients with bar attachments. Stereognosis tests were carried out, and the relationship between OSA and patient satisfaction was assessed with a satisfaction survey: the Turkish version of the oral health impact profile-14 (OHIP-TR-14). To compare differences in oral sensory function among individuals with natural dentition, complete denture wearers, and maxillary implant-supported denture wearers, tactile awareness (thickness perception threshold) and pressure awareness (threshold of lateral loading) were assessed. According to the results, the oral perception level of natural dentate patients was higher than that of the complete denture group and maxillary implant-supported complete denture group at the end of the study. There was no statistically significant difference in OHIP-TR-14 scores between the maxillary implant-supported complete denture group and the complete denture group ( P < .05). The control group perceived the applied lateral and vertical forces statistically earlier than the other groups ( P < .001). There was no statistically significant difference between the complete denture and maxillary implant-supported denture groups in terms of the lateral pressure threshold or thickness tactile threshold ( P > .05). At the end of the study it was concluded that there was no correlation between oral perception levels and satisfaction in patients with complete dentures and patients with maxillary implant-supported complete dentures. The control group, compared with the complete denture and maxillary implant-supported complete denture groups, perceived the lateral and vertical forces statistically earlier than the other groups.

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In this study, physical and mechanical properties of pumice aggregate substituted with brick flour as mineral additive and light mortars were investigated. At the preparation of mortars, pumice (0-4mm) as a fine aggregate and CEM I 42.5R Portland Cement were used. Standard mortar mixing ratios were taken as fine aggregate/Cement/Water=3/1/0.5 and pumice aggregate is used as a fine aggregate. Brick flour, which is used as mineral additive, is substituted with 0%, 10%, 20% and 30% by weight of cement. The flow values of produced mortars were determined while they were in fresh form. Mortar samples were cured in standard cure pool for 28 days. Flexural and compressive strengths of the mortar samples which were cured for 7 days, were measured. Physical properties such as water absorption, porosity and unit volume weight of 28 days cured mortars were determined and flexural and compressive strengths were calculated. At the end of 28th day samples which were reached its final strength, were exposed to 200 ⁰C, 400 ⁰C, 600 ⁰C and 800 ⁰C heats in High Temperature Oven. With determining of flexural and compressive strengths after heating, strength loss between before and after heating was designated. It is observed that the flexural and compressive strengths were decreased with increasing the ratio of Brick Flour. At all temperatures, it is occurred that the ultrasound speed was decreased. With increasing of temperatures, ultrasound speed values were reduced.

Objective The most important factor affecting the long-term success of implant supported systems is biomechanics after prosthesis delivery. The aim of this study was to investigate the prosthetic restorations designed by using different substructure materials on the implants placed according to All-On-4 technique in atrophic mandible with different stress analysis methods and compare the methods each other. Materials and Methods For this purpose, a photo-elastic resin model, according to All-On-4 concept was prepared. After taking impression, fiber-reinforced resin, PEEK, zirconia and metal substructures were manufactured with Cad/Cam. Photo elastic stress analysis was performed. On the other hand 3D virtual models of the same substructures were formed with the .stl data of the CAD. Then finite element stres analysis was applied at the same circumstances. Results In the photoelastic and finite element stres analysis, rigid substructures such as metal and zirconia showed lower stres values than elastic materials such as PEEK and fiber. As a facility of the finite element analysis internal stresses of the substructures were evaluated. Lower stresses were observed in fiber and PEEK infrastructures with low elastic modulus. Conclusion İncreased modulus of elasticity of the infrastructure, reduced.stresses transmitted to the implants When the internal stresses of the materials were evaluated, lower stresses were seen in infrastructures such as fiber and PEEK with low elastic modulus .Photoelastic and finite element stress analyzes gave similar stress results to the implant and surrounding tissues. Therefore, the results supported each other.