Onur ŞAHİN, Ayşegül KÖROĞLU, Doğu Ömür DEDE, Şeyda ADIGÜZEL, Baki HAZER

Farklı yöntemlerle polimerize edilen kopolimer akrilik rezinlerin mekanik özelliklerinin ve artık monomer içeriğinin değerlendirilmesi

Amaç: Bu çalışmanın amacı dört farklı monomer eklenerek kopolimerizasyon mekanizmasıyla polimerize olmuş protez kaide rezinlerinin bükülme dayanımı, elastik modulus, çarpma dayanımı ve artık monomer içeriğinin değerlendirilmesidir. Gereç ve Yöntemler: Bütil metakrilat (BMA), isobütil metakrilat (IBMA), 2-hidroksietil metakrilat (HEMA) ve metakril-polihedral silseskioksan (POSS-MA) hacimce %2, %5 ve %10 konsantrasyonlarında konvansiyonel ısı (HP) ve mikrodalga (MP) akrilik monomerlerine ilave edilmiştir. Universal test cihazı ve Charpy tip çarpma test cihazı ile örneklerin bükülme dayanımı, elastik modulusu ve çarpma dayanımı ölçülmüştür. Yüksek performanslı sıvı kromatografisi (HPLC) metoduyla artık monomer içerikleri belirlenmiştir. Bulgular: %10 IBMA ve %10 HEMA, HP rezinlerin bükülme dayanımını artırmıştır. MP rezin grubunun elastik modulusu için kontrol grubu ile %2 ve %5 IBMA, %5 ve %10 HEMA ve %5 POSS-MA grupları arasında anlamlı farklılıklar gözlenmiştir (P

Evaluation of the mechanical properties and residual monomer content of copolymer acrylic resins polymerized by different methods

Background: The aim of this study was to evaluate the effect of adding four different monomers on the flexural strength, elastic modulus, impact strength and residual monomer content of denture base resins polymerized by copolymerization mechanism.Methods: Butyl methacrylate (BMA), Isobutyl mathacrylate (IBMA), 2-hydroxyethyl methacrylate (HEMA) and methacryl-polyhedral silses quioxane (POSS-MA) were added to monomers of conventional heat (HP) and microwave polymerized (MP) polymethyl methacrylate (PMMA) resin at the concentrations of 2%, 5% and 10% per volume. The flexural strength, elastic modulus and impact strength of specimens were measured with an universal testing machine and Charpy-type impact tester. Residual monomer contents were determined by high performance liquid chromatography (HPLC) method. Results: 10% IBMA and 10% HEMA enhanced the flexural strength of HP resin. For the elastic modulus of MP resin, significant differences observed between the control group and 2 and 5% IBMA, 5 and 10% HEMA, and 5% POSS-MA groups (P

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