The aim of this study was to evaluate flexural strength, elastic modulus and dynamic mechanical analysis (DMA) of heat-polymerized polymethyl methacrylate resin, polyamide resin and glass fiber-reinforced polyamide resin. Materials and MethodsThree groups were determined according to denture base materials as polymethyl methacrylate resin (H), polyamide resin (P) and glass fiber reinforced polyamide resin (R). Sixteen specimens for each denture base material were prepared with dimensions of 64x10x3.3 mm for three-point bending test. Two specimens for each denture base material were prepared with dimensions of 30x10x3 mm for DMA. Polymethyl methacrylate and polyamide specimens were prepared according to the manufacturer's recommendations. The silane was applied to glass fibers (4.5 mm length) 2% by weight of the polyamide resin, they were placed in polyamide resin cartilages and injected to the mold. The thermal aging procedure was applied to half of specimens of each material (n=8). Flexural strength and elastic modulus of the specimens were determined by three-point bending test at a speed of 5 mm/ min. DMA was performed to 1 specimen from each group to evaluate viscoelastic properties. Data were analyzed with one-way ANOVA, Tukey and Paired t tests. ResultsA statistically significant difference was found in flexural strength and elastic modulus values of denture base materials (p=0.00). The highest flexural strength and elastic modulus values were observed in polymethyl methacrylate group. There was no significant difference between polyamide and glass-fiber reinforced polyamide groups (p=0.497). No significant difference was determined in all threedenture base materials before and after aging procedure. ConclusionThe reinforcement with glass-fibers did not affect the flexural strength and elastic modulus of polyamide resin.
Objective: The aim of this study was to evaluate and compare the microtensile bond strengths of four current adhesive materials that contain different monomers at deep and superficial dentin. Material and Methods: Forty non-carious human third molars (n = 5) were used in the study. Specimens were divided into two main groups according to dentin thickness as superficial and deep dentin. Groups were further divided into four subgroups in terms of the adhesive systems used: Nova Compo B Plus (NCBP), Nova Compo B (NCB), Futurabond M (FB) and Clearfil S3 Bond Plus (CS3). All specimens were bonded to resin composite and stored in 37 °C water for 9-months. Teeth were sectioned into 3 x 3 mm x 1mm thick beams. Microtensile bond strength test was carried out by using a universal testing device (1 mm/min). After fracture, failure types were observed using an optical microscope and the fractured dentin surfaces were observed by a scanning electron microscopy (SEM). One-way ANOVA and Tukey tests were used to compare the adhesive system in each dentin group. An unpaired T-test was used to compare the dentin thickness in each adhesive material. Results: As compared to deep dentin, superficial dentin showed higher µTBS values in groups NCBP, FB and CS, as opposed to group NCB. Only NCB revealed higher bond strength at deep dentin layers when compared to superficial dentin. In the superficial dentin group, NCBP showed the highest bond strength value, while NCB showed the lowest bond strength. In the deep dentin group, while NCB showed the highest bond strength value, NCBP revealed the lowest bond strength value after 9-months storage. While 4-META and 10-MDP monomer combination (NCBP) resulted in the highest bond strength value among the adhesive systems in the superficial dentin group, the monomer combination (NCB) resulted in the highest bond strength in deep dentin group. Conclusions: Microtensile bond strength performance are affected by both the type of monomer in the adhesive combination and the depth of the dentin. KEYWORDS Adhesive system; dentin thickness; hydrophobic monomer; microtensile bond strength; scanning electron microscopy.
Kaybedilen dişlerin protetik rehabilitasyonu için dental implantların kullanımı, günümüz diş hekimliğinde oldıukça sık kullanılan bir tedavi seçeneğidir. Ancak, bu tedavi protokolü uygulanırken oklüzyon prensiplerine dikkat edilmediğinde komplikasyonlar ve hatta implant kayıpları görülebilmektedir. İmplant destekli protezlerin başarısızlığında rol alan ana nedenlerden biri olan aşırı oklüzal kuvvetler, krestal kemik kaybıyla birlikte implant çevresinde anaerobik sulkus derinliğini arttırarak peri-implantitise neden olabilmektedir. Mekanik prensiplere uygun bir oklüzyon elde edilmesi, kuvvetlerin ağırlıklı olarak implant gövdesinin uzun ekseni boyunca yönlendirilmesi anlamına gelmektedir. Bu derlemede, oklüzal kuvvetlerin, dental implantları ve etrafındaki kemiği nasıl etkileyebileceği açıklanacak ve oluşabilecek komplikasyonlar hakkında bilgi verilerek, implant üstü protezlerin okluzal uyumlamaları hakkında klinik önerilerde bulunulacaktır.
There are often bonding problems between acrylic resins and silicone. PEEK (polyetheretherketone), which is a high-performance polymer, has great potential for the implant, and fixed or removable prosthodontics. The aim of this study was to evaluate the effect of different surface treatments on PEEK to be bonded to maxillofacial silicone elastomers. A total of 48 specimens were fabricated from either PEEK or PMMA (Polymethylmethacrylate) (n = 8). PMMA specimens acted as a positive control group. PEEK specimens were divided into five study groups as surface treatments as control PEEK, silica-coating, plasma etching, grinding, or nano-second fiber laser. Surface topographies were evaluated by scanning electron microscopy (SEM). A platinum-primer was used on top of all specimens including control groups prior to silicone polymerization. The peel bond strength of the specimens to a platinum-type silicone elastomer was tested at a cross-head speed of 5 mm/min. The data were statistically analyzed (α = 0.05). The control PEEK group showed the highest bond strength (p < 0.05) among the groups. No statistical difference was found between control PEEK, grinding, or plasma etching groups (p > 0.05). The lowest bond strength was seen in the laser group, which was not statistically different from silica-coating (p > 0.05), and statistically different from control PEEK, grinding, or plasma groups (p < 0.05). Positive control PMMA specimens had statistically lower bond strength than either control PEEK or plasma etching groups (p < 0.05). All specimens exhibited adhesive failure after a peel test. The study results indicate that PEEK could serve as a potential alternative substructure for implant-retained silicone prostheses.
Bu çalışmanın amacı, dört farklı yüzey bitirme metodunun ve yaşlandırma işleminin dental hibrit seramik materyalde yüzey pürüzlülüğü ve renk stabilitesi üzerine etkisinin değerlendirilmesidir. Gereç ve Yöntem: Hibrit seramik bloklar 12x14x1 mm boyutlarında hazırlandı ve örnekler yüzey bitirme metotlarına göre; teknisyen kitiyle polisaj (ET), klinik kitiyle polisaj (EC), kumlanan yüzeye sealant ajanı uygulama (ES) ve asitlenen yüzeye sealant ajanı uygulama (EA) olmak üzere 4 alt gruba ayrıldı (n=10). Renk parametreleri ve yüzey pürüzlülük değerleri ölçüldü. Tüm örneklere yaşlandırma işlemi uygulandı. Renk ve yüzey pürüzlülük değerleri tekrar ölçüldü. Renk değişim (ΔE) değerleri hesaplandı ve verilerin analizi Kruskal Wallis, Bonferroni Dunn ve Wilcoxon signed ranks testleri kullanılarak yapıldı. Her gruptan 2 örnekte Taramalı Elektron Mikroskobuyla (SEM) yüzey analizi yapıldı. Bulgular: Farklı yüzey bitirme işlemi uygulanan grupların ΔE değerleri arasında istatistiksel olarak anlamlı fark gözlenmedi. Yaşlandırma işlemi öncesi ve sonrasında, EA grubu en düşük yüzey pürüzlülük değerlerini gösterdi. Yaşlandırma işlemi sonrasında ES grubunun yüzey pürüzlülük değerleri yükseldi. Sonuç: Hibrit seramik materyalin renk stabilitesi yüzey bitirme metodundan etkilenmedi ve en düşük yüzey pürüzlülük değerleri asitlenmiş yüzeye sealant ajanı uygulanan grupta görüldü.
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