Impact of Different Bleaching Methods on Surface Roughness, Microhardness, and Tooth-Restoration Interface of Ormocer- and Methacrylate-based Restorative Systems
Year: 2025
Type: article
Abstract: Background: The current study assessed the impacts of various in-office bleaching materials (light-activated and chemically-activated) on surface roughness, microhardness, and tooth-restoration interface of two composites restorative systems (ormocer-based and methacrylate-based).Material and Methods: Sixty specimens were prepared for surface roughness and microhardness (2-mm-thickness, 10-mm-diameter) and classified according to restorative materials (n=30 for each group): group A (ormocer-based group) (Admira fusion, Voco, Cuxhaven, Germany) and group B (methacrylate-based group) (Tetric-N-Ceram, Ivoclar Vivadent, Schaan, Liechtenstein).Each group were subdivided into three subgroups (n=10) according to bleaching agent: subgroup 1 (control group, no bleaching), subgroup 2 (bleached with chemically-activated bleaching agent) (Opalescence Boost, Ultradent, USA), and subgroup 3 (bleached with light-activated bleaching agent) (Philips Zoom, Discus, USA).Eighteen maxillary central incisors teeth were subjected to a tooth-restoration interface evaluation (n=9 for each group) and (n=3 for each subgroup).All specimens were finished, polished, and bleached according to manufacturer's instruction.A three-dimensional optical profilometer (Wyko, Model NT 1100, Veeco, Tucson, USA) was used to measure surface roughness.The microhardness was assessed using Vickers tester (Model HVS-50, Laizhou Huayin Testing Instrument Co., Ltd.China) and a scanning electron microscope (SEM) (JEOL.JSM.6510LV,Japan) was used to evaluate tooth-restoration interface.The level of statistical significance was determined at p<0.05.Results: For both bleaching agents.There was statistically significant increase of surface roughness for both composite materials after bleaching, and vice versa for microhardness (p<0.05), and there was no significant difference between bleaching agents (p>0.05).A gap was formed after exposure to bleaching agents compared to control group for both restorative systems.
DOI: 10.4317/jced.62614
Authors: AI. Alkhuzaie, ME. Elawsya, NR. Elkholany
Institutions: Mansoura University, Mansoura National University
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4409021100