Effects of Third-generation LED LCU on Nanomechanical Properties of Orthodontic Adhesives

F. Bilgica, H. Altanb, Ö. Akinci Sözera, Z. Arslanogluc, E. Kaled and S. Özarslane aMustafa Kemal University, Faculty of Dentistry, Department of Orthodontics, Hatay, Turkey bGaziosmanpaşa University, Faculty of Dentistry, Department of Pediatric Dentistry, Tokat Turkey cPrivate Dentist, Hatay, Turkey dMustafa Kemal University, Faculty of Dentistry, Department of Prosthodontics, Hatay, Turkey eMustafa Kemal University, Faculty of Arts and Sciences, Department of Physics, Atom and Molecular Physical Education Department, Hatay, Turkey

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The aim of this study was to compare the hardness and elastic modulus of orthodontic adhesives cured with different light-curing units, based on light-emitting diodes. Standardized samples of orthodontic adhesives, Transbond™ XT, Opal® Bond™ and Light Bond™ were prepared in cylinder blocks and cured for three seconds with Valo Ortho LED (Ultradent Products, South Jordan, Utah) and Valo LED High-Power Mode. After grinding and polishing, specimens were stored in distilled water at 37°C for one day. Specimens were investigated using nanoindenter. Employment of Valo Ortho unit has resulted in significantly higher elastic modules for Transbond™ XT (p=0.041). The highest nanohardness and elastic modules were measured for Transbond™ XT cured with Valo Ortho (9.47 GPa; 81.85 GPa, respectively) and lowest for Opal® Bond™ for both Valo Ortho (0.44 GPa; 14.52 GPa, respectively) and Valo High-Power groups (0.44 GPa; 11.84 GPa, respectively).

DOI: 10.12693/APhysPolA.132.697 PACS numbers: 62.20.-x, 62.20.Qp