The Effect of Different Exposure Times on Some Properties of Three Types Visible Light Cured Acrylic Resins
DOI:
https://doi.org/10.15218/edj.2018.05Keywords:
VLC, Cold-cured denture base materials, Dimensional changes, Indentation hardness, and Dimensional stabilityAbstract
Background and Objectives: Visible light cured (VLC) acrylic resin is one of the developed polymeric acrylic resins found to be suitable for many dental applications: Removable, fixed, maxillofacial prostheses. The objective of this study was to evaluate the effect of different exposure times on some mechanical properties of VLC acrylic resins and compare with cold cured acrylic resins.
Materials and methods: Three types of VLC of baseplate resin materials tested; VLC (Plaque, Promedica, and Dura Base LC) materials and a cold cured acrylic resin material (Paladent RR) considered as control group. The specimens of VLC subdivided to three groups each group cured by 3 different exposure times (4 minutes, 8 minutes and 12 minutes. Testing of dimensional changes, indentation hardness and dimensional stability (adaptation) performed for all specimens.
Results: Different curing times showed a considerable influence on dimensional changes and dimensional stability of the VLC acrylic resin. The VLC baseplate material (Plaque) exhibited lowest values of dimensional expansion and volumetric dimensional changes; and highest values of indentation hardness among other VLC materials (Promedica and Dura Base LC). Regarding the control group, the cold cure resin (Paladent RR); exhibit highest values of dimensional expansion, indentation hardness and moderate values of dimensional stability.
Conclusions: The results of the present study showed that, VLC materials had properties which enable the dentist to use them for various purposes in prosthodontics purposes.
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