Surface Roughness And Hardness Of Microhybrid Resins: In-vitro Study

• Published in: International dental journal 2024-10, Vol.74, p.S299-S299
• Main Authors: Jaâfoura, Sabra, Amira, Kikly, Mariem, Fejjeri, Saida, Sahtout, Dorra, Kammoun
• Format: Article
• Language: English
• ISSN: 0020-6539
• DOI: 10.1016/j.identj.2024.07.286

The aim of this in-vitro study is to explore the effect of immersion for 28 days in different solutions on the surface roughness and microhardness of two microhybrid composite resins used for definitive coronary filling. Two materials were used, namely FiltekTM Z350 XT (3M ESPE) and Harvard Restore (Harvard Dental international GmbH). For each material, 30 disc-shaped samples (according to ISO standard 4049: 2019) were prepared. The samples were randomly divided into 6 subgroups (n=5) to be immersed in different solutions: Group A: artificial Saliva; Group B: Turkish coffee; Group C: lemonade; Group D: black tea; Group E: Coca Cola zero% (pH: 2.8); Group F: Green tea. The surface roughness of each sample was measured by a Taylor Hobson Surtronic S-116 conventional diamond stylus profilometer. Hardness and surface roughness were measured 28 days after immersion in different solutions. The statistical analysis was carried out using SPSS Statistics 21.0. A significant variation in surface roughness and hardness was found depending on the material (p=.022;.000 respectively). Surface hardness varied significantly depending on the immersion solution. A non-significant negative correlation was found between hardness and roughness; The Pearson coefficient being 17%. The Harvard Restore showed a better surface finish compared to the Filtek®Z350 in terms of surface roughness and hardness. Coca-cola zero showed behavior almost similar to artificial saliva. Knowing the composition of the restorative material is important to favor a composite with good polishability in order to maintain optimal longevity for clinical applications.