Eric Whaites, MSc BDS(Hons) FDSRCS(Edin) FDSRCS(Eng) FRCR DDRRCR, Senior Lecturer and Honorary Consultant in Dental and Maxillofacial Radiology, Head of the Unit of Dental and Maxillofacial Radiological Imaging, King’s College London Dental Institute at Guy’s, King’s College and St Thomas’ Hospitals, London, UK and Nicholas Drage, BDS(Hons) FDSRCS(Eng) FDSRCPS(Glas) DDRRCR, Consultant and Honorary Senior Lecturer in Dental and Maxillofacial Radiology, University Dental Hospital, Cardiff and Vale University Health Board, Cardiff, UK