1. Consultant in Restorative Dentistry, Maxillo-Facial Unit, Morriston Hospital, Swansea SA6 6NL, UK
2. Consultant in Restorative Dentistry, Cardiff University Dental Hospital, Heath Park, Cardiff CF4 4XY, UK
3. Reader and Consultant, Maxillo-Facial Unit, Morriston Hospital, Swansea SA6 6NL, UK