1. Aristotle University of Thessaloniki Aggelon 4D Pefka 57010 Thessaloniki , Greece
2. Department of Endodontology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki , Greece
3. Department of Dentoalveolar Surgery, Implantology and Radiology, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki , Greece