Sentence:  Recently it has been shown that the bacterial flora of endodontic and <WSD>periodontal</WSD> abscesses differ in certain aspects. Thus, in an endodontic abscess, the number of spirochetes is between 0 and 10%, whereas in a <WSD>periodontal</WSD> abscess the spirochete count is about 40%. 
Meaning of the word marked with <WSD> tags:  of, or relating to periodontics