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Acknowledgement
I would like to express my deep and sincere gratitude to my supervisor, Professor Aune Raustia, D.D.S., Ph.D., Head of the Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Oulu. Her wide knowledge and her logical way of thinking have been of great value for me. Her understanding, encouraging and personal guidance have provided a good basis for the present thesis.
I am deeply grateful to my supervisor, Professor Kyösti Oikarinen, D.D.S., Ph.D., Head of the Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Oulu, for his detailed and constructive comments, and for his important support throughout this work.
I wish to express my warm and sincere thanks to Professor Min Hong, D.D.S., Ph.D., Head of the Department of Oral and Maxillofacial Surgery, General Military Hospital, Beijing, China, who introduced me to the field of oral maxillofacial surgery and Professor Kurt Schellhas, M.D., Director of Neuroimaging and Spinal Injection Procedures, Center for Diagnostic Imaging, Minnesota, USA, whose letters gave me important guidance during my first steps into MR imaging studies. Their ideals and concepts have had a remarkable influence on my entire career in the field of temporomandibular joint research.
I owe my most sincere gratitude to Professor Eric Fossion MD, LDS, and Professor Antoon De Laat, LDS, GHO, who gave me the opportunity to work with them in the Department of Oral and Maxillofacial Surgery at the Catholic University of Leuven in Belgium and gave me untiring help during my difficult moments.
I warmly thank Dr. Hannu Pernu, D.D.S., M.D., for his valuable advice and friendly help. His extensive discussions around my work and interesting explorations in operations have been very helpful for this study.
My warm thanks are due to Professor Juhani Pyhtinen, M.D., Ph.D., and Professor Changzu Fan, M.D., who directed me in magnetic resonance imaging studies. Their kind support and guidance have been of great value in this study.
My sincere thanks are due to the official referees, Docent Pentti Kemppainen, D.D.S., Ph.D., and Docent Osmo Tervonen, M.D., Ph.D., for their detailed review, constructive criticism and excellent advice during the preparation of this thesis.
I wish to thank Mr. Ahti Niinimaa, M.Sc., Ph.D., and Mr. Risto Bloigu, M.Sc., for their guidance in statistical analysis, and Dr. Petri Tiilikainen, D.D.S., for his essential assistance in reviewing the patient files of this study.
I am grateful to Docent Kimmo Lehtimäki, D.D.S., Ph.D., for attracting me to Finland and for interesting discussions on the operations of the temporomandibular joint.
I also wish to thank Mrs. Anna Vuolteenaho, M.A., for revising the English of my manuscript. Ms Liisa Kärki, Ms Seija Leskelä and Ms Taru Kaleva are thanked for their excellent photographic work, and Ms Sinikka Vuoti and Ms Eija Takkula for their sympathetic help in secretarial work.
During this work I have collaborated with many colleagues for whom I have great regard, and I wish to extend my warmest thanks to all those who have helped me with my work in the Department of Prosthetic Dentistry and Stomatognathic Physiology in Oulu, in the Department of Oral and Maxillofacial Surgery and in the Department of Diagnostic Radiology at the University of Oulu, at Tampere University Hospital, at Leuven University Hospital in Belgium, and at General Military Hospital in Beijing, China.
I owe my loving thanks to my wife Xiaoping Liang, my sons Zou yi Yang and Zichao Liang. They have lost a lot due to my research abroad. Without their encouragement and understanding it would have been impossible for me to finish this work. My special gratitude is due to my brother, my sisters and their families for their loving support. My loving thanks are due to Raili and Pentti Rantanen. They let me own a happy family in Finland.
The financial support of the University of Oulu is gratefully acknowledged.
Oulu, Finland, February 2002
Xiaojiang Yang