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Resin-based composites containing finer fillers best maintain glossiness after routine tooth brushing: Study
USA: A recent study published in the Journal of Esthetic and Restorative Dentistry has shed light on the isolated effect of filler particle size on surface properties of experimental resin composites before and after toothbrush abrasion.
The researchers showed a significant reduction in gloss of resin-based composites (RBCs) containing fillers with larger particle sizes. There was an increase in surface roughness after toothbrushing abrasion for all RBCs, except those containing the finest-sized fillers.
"The particle size of the filler is a crucial determinant of the gloss and surface roughness of RBCs, after polishing and toothbrushing," reported Mikihiro Kobayashi, Oregon Health & Science University, Portland, Oregon, USA, and colleagues.
The study was conducted to isolate the relationship between filler size and the surface properties of roughness and gloss before and after toothbrush abrasion for experimental resin-based composites containing uniform spherical fillers.
For this purpose, the researchers studied five experimental light-cured RBCs with different spherical filler sizes and three commercial RBCs. Using silicon carbide papers, forty specimens were polished. Gloss measurement was done after 0, 90, 180, and 360 min of simulated toothbrushing, and surface roughness was measured before and after 360 min of toothbrushing. The RBCs were compared using the two-way ANOVA/Tukey's multiple comparison tests, and the correlation between particle size and surface gloss or roughness was also determined.
The study led to the following findings:
- After polishing and toothbrushing, RBCs with smaller fillers exhibited significantly lower surface roughness and higher gloss, and RBCs with larger fillers exhibited lower gloss and higher surface roughness.
- There was a significant correlation between filler particle size and gloss and surface roughness, both before and after toothbrush abrasion.
"The gloss of resin-based composites is reduced by increased surface roughness caused by toothbrush abrasion," the researchers wrote. "Resin-based composites containing finer fillers best maintain glossiness after routine tooth brushing."
Reference:
Kobayashi, M., Koi, K., Wiskoski, S., Watanabe, H., Lewis, S., & Ferracane, J. L. (2023). Isolated effect of filler particle size on surface properties of experimental resin composites before and after toothbrush abrasion. Journal of Esthetic and Restorative Dentistry, 35(8), 1286-1292. https://doi.org/10.1111/jerd.13105
MSc. Biotechnology
Medha Baranwal joined Medical Dialogues as an Editor in 2018 for Speciality Medical Dialogues. She covers several medical specialties including Cardiac Sciences, Dentistry, Diabetes and Endo, Diagnostics, ENT, Gastroenterology, Neurosciences, and Radiology. She has completed her Bachelors in Biomedical Sciences from DU and then pursued Masters in Biotechnology from Amity University. She has a working experience of 5 years in the field of medical research writing, scientific writing, content writing, and content management. She can be contacted at  editorial@medicaldialogues.in. Contact no. 011-43720751
Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751