Libianko Sianturi, Syahrul Humaidi, Timbangen Sembiring, Erna Frida, Makmur Sirait
This study examines the effects of varying ultraviolet (UV) exposure times on the properties of UDMA/TEG-DMA composite resins, focusing on degree of conversion, surface morphology, water absorption, shrinkage, hardness, and flexural strength. Composite resin samples were exposed to UV light for 30, 60, 90, and 120 min. The degree of conversion was assessed using Fourier Transform Infrared Spectroscopy (FTIR). Surface morphology was analyzed via Scanning Electron Microscopy (SEM). Water absorption and shrinkage were measured following standard procedures, while mechanical properties, including hardness and flexural strength, were evaluated using a Vickers hardness tester and a 3-point bending test, respectively. The results indicate that a UV exposure time of 90 min optimizes the composite resin properties, achieving the highest degree of conversion at 77 %, optimal surface morphology, minimal water absorption and shrinkage, and superior mechanical properties, including maximum flexural strength and hardness. In contrast, both shorter and longer UV exposure times detrimentally affected these properties, with prolonged exposure causing thermal degradation and reduced performance. This research underscores the importance of precise UV curing time control to enhance the performance and durability of UDMA/TEG-DMA composite resins, providing valuable insights and practical guidelines for their application in dental and industrial fields. © 2024, Walailak University. All rights reserved.
Post Graduate Program (Physics), Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Jln Bioteknologi no 1, Medan, Indonesia; Department of Electrical Engineering, Faculty of Engineering, Universitas HKBP Nommensen, Medan, Indonesia; Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Medan, Medan, Indonesia
