1. Department of Oral and Maxillo Facial Sciences, Sapienza University of Rome, Via Caserta 6, 00161 Rome, Italy
2. Operative Research Unit of Dentistry, Policlinico Universitario Campus Bio-Medico Foundation, Via Alvaro del Portillo 200, 00128 Rome, Italy
3. Department of Conservative Dentistry and Endodontics, Nair Hospital Dental College, Mumbai 400008, India