1. Surgeon Commander (D) Graeme Bryce Royal Navy, Consultant in Restorative Dentistry, Centre for Restorative Dentistry, Defence Primary Health Care (Dental), Evelyn Woods Road, Aldershot, GU11 2LS
2. Clinical Assistant Professor, University of Michigan School of Dentistry, 1011 N University, Ann Arbor, MI 48109, USA
3. Specialist in Endodontics, Periodontics, Prosthodontics and Restorative Dentistry, Oralon Specialist Dental Care, 2 The Circle, Queen Elizabeth Street, London SE1 2JE, UK