[Comparison of two gastric cancer screening schemes in a high-risk population].

OBJECTIVE: To evaluate the effects of two gastric cancer screening schemes for early detection of gastric cancer in a high-risk population. METHODS: A cluster random sampling method was used to select local residents aged 40-69 years from Linqu County, Shandong Province. "Serum pepsinogen initial screening combined with further endoscopic examination (PG scheme)" and "direct endoscopic examination (endoscopy scheme)" were conducted. The associations between screening schemes and detection rates of gastric cancer, and early gastric cancer/high-grade intraepithelial neoplasia were evaluated by unconditional logistic regression analysis. RESULTS: Overall, 3654 and 2290 participants completed PG and endoscopy schemes, respectively. A total of 11 (0.30%) cases of gastric cancer and 10 (0.27%) cases of high-grade intraepithelial neoplasia were detected by PG scheme, of which 7 (0.19%) cases were early gastric cancer. While, 19 (0.83%) cases of gastric cancer and 10 (0.44%) cases of high-grade intraepithelial neoplasia were detected by endoscopy scheme, with 12 (0.52%) cases of early gastric cancer. Compared with the PG scheme, the endoscopy scheme had a significantly higher detection rates of gastric cancer (OR = 2.83, 95%CI 1.34-5.98), and early gastric cancer/high-grade intraepithelial neoplasia (OR = 2.12, 95%CI 1.12-4.02). CONCLUSIONS: The endoscopy scheme is more effective in the detection of gastric cancer in a high-risk population, particularly for early gastric cancer/high-grade intraepithelial neoplasia than the PG scheme.

[The effect of the metallic dental materials on magnetic resonance imaging].

OBJECTIVE: To explore the influence of conventional metal materials in oral cavity on brain magnetic resonance imaging (MRI). METHODS: Four kinds of metal materials (metal ligature wire, forging hard and slotless denture, casting nichrome denture, casting copper alloy denture) in oral cavity were scanned through MRI. FSE sequence T1 weighted imaging (FSE T1), EPI diffusion-weighted imaging (DWI) sequence of ordinary, Propeller DWI imaging were used. RESULTS: In FSE T1 sequence, metal ligature wire and forging hard and slotless denture produced serious false image, casting nichrome denture produced moderate false image, casting copper alloy denture produced only little false image. In EPI DWI sequence, obvious magnetic-sensitive false image were produced in the dissection tissue of the brain by metal ligature wire. While in Propeller DWI sequence, magnetic-sensitive false image were greatly reduced and satisfactory images were formed. CONCLUSION: Different metal materials in oral cavity have different influence on the MRI. The false images produced by different metal materials are closely related to the type of the material. Magnetic-sensitive false images can be eliminated by Propeller DWI technique.

[Effect of periodontitis on circulating C-reactive protein in type 2 diabetes patients].

OBJECTIVE: To investigate the effect of periodontal infection on circulating C-reactive protein (CRP) in type 2 diabetes patients. METHODS: 32 diabetes patients with advanced periodontitis participated in this study. They were compared to a group of 32 diabetes patients without periodontal disease, who were mathed with regard to age (+/- 3 years), gender and body mass index (+/- 1 kg/m2). The concentration of CRP on circulation was measured by ELISA. RESULTS: Significant difference was found in the level of CRP and the percentage of subjects with elevated CRP levels > or = 3 mg/L on circulation between the two groups(P < 0.05). CONCLUSION: Periodontal infection results in higher circulating CRP in type 2 diabetes patients. This elevated inflammatory factor may exacerbate insulin resistance and increase the risk for great vessels complications of diabetes mellitus.