Liliana Porojan, Flavia Roxana Toma, Mihaela Ionela Gherban, Anamaria Matichescu, Roxana Diana Vasiliu
ABSTRACT
The aim of the study was to assess the surface characteristics of clear thermoplastic materials related to artificial ageing, based on quantitative criteria and to select the most relevant multiscale roughness parameter. Materials and methods: Three commercially available thermoplastic PETG materials were chosen for the study: Crystal (C), Duran (D), and Erkodur (E). They were subjected to artificial ageing by saliva immersion and hydrothermal ageing, in order to simulate 14 days of intraoral use. Topographic characterizations of the surfaces were generated and multiscale roughness parameters were measured. Statistical analyses were performed. Results: During artificial ageing, while micro-roughness decrease, nano-roughness increase. Statistical tests highlighted significant differences between the behaviour of the materials involved into the study. Conclusions: The surface characteristics of PETG clear thermoplastic materials are sensitive to artificial ageing. Nano-roughness parameters are responsible for the increased materials surface roughness.
DOI : 10.62610/RJOR.2025.1.17.53
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