1. Department of Conservative Dentistry with Endodontics, Medical University of Silesia, Faculty of Medical Science, Bytom, Poland
2. Faculty of Biomedical Engineering, Department of Biosensors and Biomedical Signal Processing, Silesian University of Technology, Zabrze, Poland
3. Pachonscy Dental Clinic, Strzebiń, Poland
4. Silesian University of Technology, Institute of Mathematics, Gliwice, Poland