the effect of carbonated drinks with different low ph levels on surface roughness of nano-filled composite resin

Background and aim: nano-filled composite resins are popular due to their small filler size, which results in a smooth restoration surface, a vital physical property. the consumption of carbonated drinks is increasing. continuous exposure in a low ph environment causes composite resin’s surface roughness. a rough surface accumulates dental plaque, which causes various dental complications. material and methods: this research used 27 filtek z350xt nano-filled composite samples prepared using disc-shaped 8mm diameter and 2mm thickness. samples were divided into three groups: a control group of ph 7.0 distilled water, carbonated drink a of ph 2.4, and carbonated drink b of ph 2.9, immersed in 5ml vials for two hours per day for 15 days. the surface roughness of samples was measured before and after immersion on day 15 using a surface roughness tester. changes in surface roughness were analyzed using one way anova and post hoc test.results: surface roughness of samples immersed in the control group, carbonated drink a of ph 2.4 and carbonated drink b of ph 2.9 respectively to be 0.1333±0.07331μm: 0.8011±0.07897μm; 0.5311±0.08695μm. one-way anova showed a significant difference in the surface roughness of nano-filled composite resin samples. conclusions: based on the results, it can be concluded that after 15 days of immersion in carbonated drinks with low ph levels, the surface roughness of nano-filled composite resin significantly increased.