Study on the features of carotid intinal medial thickness in pre-hypertension / 中国基层医药

Objective To study the features of carotid intinal medial thickness in the pre-hypertensive people. Methods Subjects were divided into three groups according to blood-pressure status using the JNC-7 criteria.We measured the carotid intinal medial thickness in carotid artery,the bifurcationg of internal and external carotid artery by means of echocardiography in 75 normotension(NTN) people,74 pre-hypertension(PHT) people and 77 hypertension(HIN) patients. Results IMT of pre-hypertension and hypertension was higher than normotension (P ＜0. 05). Conclusion PHT people had subclinical disease of carotid intinal medial thickening.

Effects of hyperbaric oxygen on subgingival obligately,facultatively anaerobes and black pigmented bacteroides in periodontics pocket / 实用口腔医学杂志

Objective: To investigate the effects of hyperbaric oxygen(HB0_2) on black pigmented bacteroides groups(BPB), obligately and facultatively anaerobes of periodontitis. Methods: 60 periodontitis cases were divided into 2 groups. The HB0_2 group(gingival scaling was done at the first visit)was exposed in 0.25 MPa pure oxygen 90 minutes each day, and treated 10 days continuously. The control group received gingival scaling at the first visit. The clinical indices of each group were measured. The microorganisms in periodontal pocket were incubated and analyzed. The number of subgingival anaerobes as well as the number of BPB,obligately and facultatively anaerobes were measured and counted by routine anaerobic culture. Results: Highly significant differences in Gingival Indices (GI), Probing Depth (PD), Attachment Loss (AL), and also significant differences in Plaque Index (PLI),and teeth mobility were seen between the HB0_2 group and the control group. There were significant difference of PLI, GI,PD,AL, teeth mobility in HB0_2 group pre-therapy and post-therapy. There were significant difference of subgingival anaerobes amounts, obligately and facultatively anaerobes sorts between pre-therapy and post-therapy. The positive rate of BPB of group HB0_2 post-therapy were reduced more than that of pre-therapy(P<0.01). Conclusion: HB0_2 has beneficial therapeutic effects on chronic and aggressive periodontitis. The mechanism of the HB0_2 therapy might inhibit the growth of subgingival obligately and facultatively anaerobes and BPB of human periodontitis, especially the obligately anaerobes and BPB in periodontal pockets.

Effects and mechanism of hyperbaric oxygen on prostaglandins in alveolar bone and gingival of experimental periodontitis in animal / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study the effects and the therapeutic mechanism of hyperbaric oxygen (HBO) on prostaglandin E(2) (PGE(2)) in alveolar bone and gingiva of experimental periodontitis in animal.</p><p><b>METHODS</b>Experimental periodontitis was produced by silk thread sutures combined with high content sugar diet. For HBO therapy, they were exposed to a pressure of 0.25 MPa (2.5ATA), breathing pure oxygen one session a day for 60 min. The treatment course was 2 weeks. The value of PGE(2) in gingiva and alveolar bone was analyzed by enzyme immunoassay (EIA).</p><p><b>RESULTS</b>The value of PGE(2) in gingiva of control group was 3.21 ng/g, and that of PGE(2) in alveolar bone was 3.22 ng/g. The contents of PGE(2) in gingiva (13.96 ng/g) and alveolar bone (13.32 ng/g) of periodontitis group increased markedly than control group (P < 0.01). The contents of PGE(2) in gingiva (5.21 ng/g) of HBO group were 62.7% which was lower than that of periodontitis group, and the value of PGE(2) in alveolar bone (4.05 ng/g) were 69.6% lower than that of periodontitis group. The difference of PGE(2) in gingiva or alveolar bone was significant for the HBO group and periodontitis group (P < 0.01).</p><p><b>CONCLUSIONS</b>The contents of PGE(2) in alveolar bone and gingiva increased markedly when experimental periodontitis has formed. The value of PGE(2) in alveolar bone and gingiva reduce markedly after HBO exposure, and the decreased rate of PGE(2) in alveolar bone is more evident than that of PGE(2) in gingiva after HBO therapy.</p>

The effects of periodontal scaling on microorganism in periodontal pocket and gingival crevicular fluid in patients with periodontitis / 实用口腔医学杂志

Objective:To study the effects of periodontal scaling on microorganism in periodontal pocket and gingival crevicular fluid in patients with periodontitis.Methods:60 cases of periodontitis were selected and divided into 2 groups randomly with 30 in each group.The patients in scaling group were treated by periodontal scaling, those in control group by gargle with chlohexidine.Before and after treatment the microorganism in pocket bottom of each patient was measured by Congo red negative dyeing.Gingival index(GI), probing depth(PD) and gingival crevicular fluid(GCF) were also measured, the relationship between periodontal scaling and clinical indices was analysed.Results:In scaling group the percentage of coccoid cells in pocket bottom increased more after scaling,that of bacillus,spirochetes decreased, PD,GCF value were all decreased (P0.05).Conclusion:Periodontal scaling can decrease the percentage of pathogenesis bacteria in periodontal pocket bottom and decrease PD,GI and GCF values.