Axelsson P, Nystrom B, Lindhe J.: The long-term effect of a plaque control program on tooth mortality, caries and periodontal disease in adults. Results after 30 years of maintenance. J Clin periodontol 31 :749-757. 2004.
American Association of Endodontists:Endodontics:Colleagues for Excellence-Cracking the Cracked Tooth Code; American Association of Endodontists,Chicago, 2008.