[Relationship between the gingival crevicular fluid occult blood test and periodontal inflammation].

OBJECTIVE: To seek a new non-traumative method applied to the diagnosis of gingival bleeding; Studies on the internal relationship between gingival bleeding and microbacteria. METHODS: 102 saliva samples were tested for salivary occult blood test(Sobt),1600 sites for gingival crevicular fluid occult blood test (GCFobt) by the test strips, clinical assessments including sulcus bleeding index(SBI) and probing depth(PD); 79,32 subgingival plaque samples for smearing and bacteria culture respectively. Studies on the relationship between GCFobt and clinical index and subgingival bacteria. RESULTS: The sensitivity of GCFobt as a predictor for gingival bleeding was 68.0% and the specificity was 80.5%, GCFobt could more correctly indicated the local gingival inflammation than Sobt. Significant correlation was found between GCFobt and SBI (P<0.001); The percentage of spirochetes, rods and cocci had significant differences between GCFobt negative and positive( P<0.001); Significant differences in the detection of black bacteria within the GCFobt 0 and 3( P<0.01), the same as fusobacteria within GCFobt 0 and 2,3(P<0.05). CONCLUSION: GCFobt is a rapid,convenient susceptible and non-traumative method for assessing gingival bleeding, can be used as an objective index for clinical periodontal examination.

[Analysis of pathogenic relations between dental caries and periodontitis].

OBJECTIVE: In order to search the cause of dental caries and periodontitis. METHODS: Selected 70 patients with severe chronic periodontitis (CP group) and 50 patients with caries sensitivity (CS group) in clinical adults of oral medicine (18 to 50-year-old) during 1 year. Parameters of oral hygiene, caries and periodontitis were recorded in the typical groups of CP and CS. RESULTS: The patients of CP group had rare caries, DFS in the groups of CP and CS was 1.46+/-2.60 and 17.32+/-7.55 respectively(p<0.001),while the patients of CS group had relative periodontal health indeed, CPTNI in CS and CP groups were 0.98+/-0.63 and 3.24+/-0.62 respectively (p<0.001), and the number of missing teeth was 1.90+/-3.34 and 1.10+/-1.85 respectively(p>0.05). 3 patients(only 2.4%)confirmed the parameters of caries sensitive as well as severe periodontitis. CONCLUSION: The correlating pathogenesis of caries and periodontitis seems to have antiagonism tendency. The ecological connection and bacterial interaction are worthy of further study.