1. Department Di.Chir.On.S., University of Palermo, 90127 Palermo, Italy
2. Unit of Oral Medicine and Dentistry for Fragile Patients, Department of Rehabilitation, Fragility, and Continuity of Care, University Hospital Palermo, 90127 Palermo, Italy
3. Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, 98147 Messina, Italy
4. Department of Information Engineering, University of Pisa, 56122 Pisa, Italy