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1 www 2014 • Vol. 80 jcda ca Journal of the Canadian Dental Association Director, Knowledge Networks Dr. John P. O’Keefe Managing Editor Sean McNamara CDA Mission Statement Project Manager, JCDA Oasis The Canadian Dental Association is the national voice for dentistry, dedicated to the advancement and leadership of a unified profession and to the promotion of optimal oral health, an essential component of general health. Writer/Editor Chiraz Guessaier, PhD Coordinator, Publications Rachel Galipeau CDA Board of Directors President Dr. Peter Doig President-Elect Dr. Gary MacDonald Vice-President Dr. Alastair Nicoll Tricia Abe Geneviève C. Gagnon Coordinator, Electronic Media Dr. James Armstrong Dr. Larry Levin Ray Heath Dr. Michael Brown Dr. Alexander Mutchmor Graphic Designer Dr. Paul Cameron Dr. Robert Sexton Janet Cadeau-Simpson Dr. Randall Croutze Dr. Mitch Taillon Dr. Richard Holden Dr. James Tennant JCDA Mission Statement JCDA is the authoritative written voice of the Canadian Dental Association, providing dialogue between the national association and the dental community. It is dedicated to publishing worthy scientific and clinical articles and informing dentists of issues significant to the profession. All statements of opinion and supposed fact are published on the authority of the author who submits them and do not neces­ arily express the views of s the Canadian Dental Association. The editor reserves the right to edit all copy submitted to JCDA. Publica­ ion of an advertisement t ­ does not necessarily imply that the Canadian Dental Association agrees with or supports the claims therein. Furthermore, CDA is not responsible for typographical errors, grammatical errors, misspelled words or syntax that is unclear, or for errors in translations. JCDA Contact: Rachel Galipeau [email protected] Call CDA for information and assistance toll-free (Canada) at: 1-800-267-6354; outside Canada: 613-523-1770 CDA fax: [phone] CDA email: [email protected] CDA website: www.cda-adc.ca © Canadian Dental Association 2014 The Journal of the Canadian Dental Associa­ion is published in both official t languages — except research and review articles, which are published in English only. Readers may request JCDA in the language of their choice. The Journal of the Canadian Dental Association is published by the Canadian Dental Association. Copyright 1982 by the Canadian Dental Association. Publications Mail Agreement No. 40064661. Return undeliverable Canadian jcda ca | 2014 | Vol. 80, No. 1 | ESSENTIAL DENTAL KNOWLEDGE Published by The Canadian Dental Association jcdaf ca addresses to: Canadian Dental Association at 1815 Alta Vista Drive, Ottawa, ON K1G 3Y6. Postage paid at Ottawa, Ont. Notice of change of address should be received before the 10th of the month to become effective the following issue. Member: American Associat­ on of Dental Editors. i ISSN 0709 8936 Printed in Canada •5•