RESUMEN
Prostaglandins are known to be mediators of inflammation in many tissues. Their fluctuations in gingival crevicular fluid during experimentally induced periodontitis were investigated, together with the possible role of phospholipids, which were measured in normal gingiva and gingiva associated with the chronic periodontitis. Periodontitis was induced in 5 dogs in the lower premolar quadrant; the opposite quadrant was used as a control. A small amount of inter-radicular bone was removed and then a cotton-wrapped stainless steel ligature was placed around each of 3 premolar teeth below the gingival margin to provide an inflammatory irritant. Pocket depth was measured by periodontal probe; crevicular fluid was collected on absorbent paper points. PGs were analysed by HPLC and the results expressed as ng PG/microliter crevicular fluid. Measurements were taken in both quadrants at 1, 3 and 6 weeks after placement of the ligatures; PGI2, 6 keto-F1 alpha, F2 alpha, E2, E1 and D2 were detected in the crevicular fluid. At 1 week, there was no difference in PG levels between experimental and control sides. During week 3, PGI2 and PGE2 increased in the experimental crevicular fluid [214.1 +/- 49.3 (SEM) vs control 87.0 +/- 39.7; p less than 0.05 and 350.0 +/- 115 vs 162.0 +/- 14.7; p less than 0.05, respectively]. At week 6, only PGE2 was elevated in crevicular fluid (207.7 +/- 68.1 vs 99.2 +/- 45; p less than 0.025).(ABSTRACT TRUNCATED AT 250 WORDS)