Sebastian Wille1, Iris Hölken2, Galina Haidarschin3, Rainer Adelung4, Matthias Kern5. 1. Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Germany. Electronic address: swille@proth.uni-kiel.de. 2. Chair for Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Christian-Albrechts University at Kiel, Germany. Electronic address: ih@tf.uni-kiel.de. 3. Chair for Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Christian-Albrechts University at Kiel, Germany. Electronic address: galina.haidarschin@google.com. 4. Chair for Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Christian-Albrechts University at Kiel, Germany. Electronic address: ra@tf.uni-kiel.de. 5. Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Germany. Electronic address: mkern@proth.uni-kiel.de.
Abstract
OBJECTIVE: The aim of this study was to evaluate whether the mechanical properties of the modern dental composites can be improved by using tetrapodal ZnO particles as fillers in a Bis-GMA/TEGDMA matrix. Another aim was to test whether the mechanical properties of the composite are influenced by functionalization of the ZnO particles with lauric acid to achieve antibacterial activity. METHODS: Different filler materials and particle shapes (spherical zirconia, spherical zinc oxide, tetrapodal zinc oxide) were used to produce Bis-GMA/TEGDMA based composites with a filler content of 40wt.-% and 60wt.-%, respectively. In addition, functionalization with lauric acid was investigated. For the biaxial flexural strength testing 104 test disks (N=8) with a diameter of 15mm and a thickness of 1.5mm were produced. RESULTS: Functionalization with lauric acid resulted in a decrease in biaxial flexural strength for all filler materials. The biaxial flexural strength decreased when using a higher filler content with spherical particles but increased when using tetrapodal zinc oxide particles. SIGNIFICANCE: A higher durability of the composites using tetrapodal zinc oxide particles. An antibacterial functionalization with lauric acid cannot be recommended as the mechanical stability of the composite will be reduced.
OBJECTIVE: The aim of this study was to evaluate whether the mechanical properties of the modern dental composites can be improved by using tetrapodal ZnO particles as fillers in a Bis-GMA/TEGDMA matrix. Another aim was to test whether the mechanical properties of the composite are influenced by functionalization of the ZnO particles with lauric acid to achieve antibacterial activity. METHODS: Different filler materials and particle shapes (spherical zirconia, spherical zinc oxide, tetrapodal zinc oxide) were used to produce Bis-GMA/TEGDMA based composites with a filler content of 40wt.-% and 60wt.-%, respectively. In addition, functionalization with lauric acid was investigated. For the biaxial flexural strength testing 104 test disks (N=8) with a diameter of 15mm and a thickness of 1.5mm were produced. RESULTS: Functionalization with lauric acid resulted in a decrease in biaxial flexural strength for all filler materials. The biaxial flexural strength decreased when using a higher filler content with spherical particles but increased when using tetrapodal zinc oxide particles. SIGNIFICANCE: A higher durability of the composites using tetrapodal zinc oxide particles. An antibacterial functionalization with lauric acid cannot be recommended as the mechanical stability of the composite will be reduced.