“The occlusalward border of the zdeac consists of cuticular material in varying stages of disintegration.”
“Almost all adults (and many younger persons) have more or less subgingival calculus on from a few to many of their teeth.”
“Successful prevention and control of periodontoclasia, therefore, requires a clear knowledge and application of the information presented in this paper, and in addition information as to the relation of the inner border of bacterial film on the tooth, within the gingival crevice, to the zdeac, which was presented in a previous paper.”
"A Clean Tooth Does Not Decay, nor does periodontoclasia occur about a clean tooth." C. C. Bass, M.D.