Preface 



Mechanisms of Hard Tissue Destruction is based on a four-session 

 symposium organized by the Section on Dentistry of the American 

 Association for the Advancement of Science, held during the 129th 

 annual meeting of the AAAS in Philadelphia, Pennsylvania, on 

 December 29 and 30, 1962. 



The symposium was cosponsored by the AAAS Sections on Den- 

 tistry (Nd), Medicine (N), and Zoology (F) and by the Interna- 

 tional Association for Dental Research, North American Division, 

 the American College of Dentists, and the American Dental Associa- 

 tion. 



A multidisciplinary approach was chosen with a view to covering 

 a theme which could serve as a logical sequence — the other side of 

 the coin, as it were — to a previous AAAS symposium which dealt 

 with the formative aspects of hard tissue biology (Calcification in 

 Biological Systems, AAAS Publication No. 64, Washington, D. C, 

 1960). 



In the present volume the oral presentations have been supple- 

 mented by three additional manuscripts (chapters 5, 10, and 23), 

 making a total of twentv-six chapters by forty-eight authors and 

 coauthors, including fourteen from institutions outside the United 

 States. 



The international participation in this symposium was made pos- 

 sible in part by a conference grant from the National Institute of 

 Dental Research, negotiated together with Dean Lester W. Burket 

 and Dr. Ned B. Williams, University of Pennsylvania School of 

 Dentistry, the latter serving as 1962 AAAS Vice President and 

 Chairman of AAAS Section on Dentistry (Nd). 



Serving with me as co-chairmen of the individual symposium ses- 

 sions were Drs. Seymour J. Kreshover, National Institute of Dental 



iii 



