Abstract:

A variety of thermoplastic materials, including “ThermoSens”, a nylon-based denture base material, can be used in the fabrication of removable partial dentures. Assessing the mechanical properties of these materials is crucial, as they directly impact the function and longevity of the dentures. Thermoplastic polyamides, known as nylons, represent an excellent alternative that can be used for treatment of partially edentulous patients with removable dentures.
Aim. The aim of this study was to evaluate the impact of ten distinct cleaning methods on the flexural strength of “ThermoSens”, using a classical three-point bending test.
Materials and methods. The study involved 50 standardized “ThermoSens” test specimens divided into ten groups, subjected to varied cleaning protocols including Corega and Protefix tablets, soft toothbrush with toothpaste or soap, and no cleaning (control). Cleaning frequency and duration differed across groups, with all specimens stored in artificial saliva at 37°C for 24 hours. The flexural strength test was carried out using a stand type MultiTest 2,5i (Mecmesin, UK), calculating the force required to break the test bodies, following standard testing specifics. Statistical analysis was performed using ANOVA (p=0.018) to assess differences between groups.
Results. The results indicate that cleaning methods affect “ThermoSens” flexural strength, with Groups 5 and 6 (using Protefix tablets) showing a statistically significant difference with the control group.
Conclusion. All cleaning methods lead to an increase in the flexural strength of the thermoplastic material, though further research is needed to refine cleaning protocols.

Keywords: denture base material, nylon, flexural strength, polyamide, “ThermoSens”, denture cleansers, disinfection