Professor N M Girdler PhD BDS BSc FDSRCS FFDRCS Professor of Sedation Dentistry at the School of Dental Sciences, Newcastle University, Newcastle upon Tyne.Mr C M Hill MDSc FDSRCS LDSRCS BDS MSc Consultant in Oral and Maxillofacial Surgery at the University of Wales College of Medicine, Dental Hospital, Cardiff.Dr K E Wilson PhD BDS MSc DDPHRCS MFDSRCS Associate Specialist in Sedation Dentistry at Newcastle Dental Hospital, Newcastle upon Tyne.