There are a lot of elements affecting the success of implant prosthesis. The quality of surgical procedure is considered as one of the key factors. To avoid the excess heat generation is an important element of successful osseointegration and it can be achieved by using a gentle surgical technique with a sharp instrument in bone drilling. This study was performed to measure and analyze comparatively the heat transmitted to surrounding bone at a distance of 0.5mm from the periphery of the drill hole in each drilling stage. The results were as follows. In standard system, the temperature of surrounding bone tissue ranged from 29.2degrees Cto 48.3degrees C with irrigation and from 34.6degrees C to 84.3degrees C without irrigation. And in wide system, the temperature of surrounding bone tissue ranged from 29.5degrees C to 52.5degrees C with irrigation and from 34.8degrees C to 87.8degrees C without irrigation. And the temperature ranges exceeded the threshold without irrigation, while showing less than the threshold by the cooling effect of irrigation. In comparing standard system with wide system, although there was no significant difference, 4.3mm pilot and 4.3mm twist drill of wide system showed high value and wide system showed slightly high elevation of temperature in all depth in fixture installation In the finite element analysis, the calculated value by the Fourier's cooling law were applied to the bone drilling surface. And through analysis using different irrigation temperatures at 28degrees C, 15degrees C and 5degrees C, and according to the time. The result was that the cooling water at least below 15degrees C was required to maintain the temperature of surrounding bone less than threshold in bone drilling, the cooling water below 5degrees C was required to gain more sufficient cooling effect, and cooling over 5 seconds was needed after bone drilling for sufficient effect.
Bone and Bones ; Dental Implants* ; Finite Element Analysis ; Hot Temperature* ; Jurisprudence ; Osseointegration ; Prostheses and Implants ; Water

No abstract available.
Hypertension, Renovascular*

No abstract available.
Child ; Femoral Fractures ; Humans

BACKGROUND: Massive hemoptysis is one of the major medical emergency with high risk of mortality. Though the best predictor of mortality associated with hemoptysis appears to be the amount of bleeding within the first 24 hours, catastrophic hemorrhage could be occurred to the patients who were apparently in a stable condition with scanty hemoptysis at the time of admission. We evaluated APACHE III score system to find if it could be a prognostic index that can predict the mortality of the patients with hemoptysis. METHODS: We identified all the patients who had admitted with hemoptysis in the Medical Intensive Care Unit of Asan Medical Center between May 25, 1989, and July 31, 1995. A retrospective analysis was done in 66 patients with hemoptysis on APA- CHE III score. RESULTS: The overall mortality rate was 17.4% (12/69). In univariate analysis of possible prognostic factors, independent predictors of mortality were age(P=0.016), amount of hemoptysis(P=0.012), AaDO2 (P=0.017), requirement of transfusion(P=0.036), mechanical ventilatory care(P<0.05) and APACHE III score(P=0.02), In multivariate analysis with sex, age, amount of hemoptysis, AaDO2, requirement of transfusion and APACHE III score, APACHE III score was the only independent predictor of mortality(P=0.015, odd ratio=19.3, 95% confidence interval, 3.4 to 249.7) CONCLUSION: APACHE IU score may be a clinically significantly important independent predictor of outcome in the patients with hemoptysis. In addition, invasive procedure, such as bronchial artery embolizaticn or operation, could be considered in advance in the patients with more than 30 points of APACHE III.
APACHE* ; Bronchial Arteries ; Chungcheongnam-do ; Emergencies ; Hemoptysis* ; Hemorrhage ; Humans ; Intensive Care Units* ; Critical Care* ; Mortality ; Multivariate Analysis ; Prognosis ; Retrospective Studies

BACKGROUND: Surgical site infection (SSI) is a potentially morbid and costly complication of surgery. While gastrointestinal surgery is relatively common in Korea, few studies have evaluated SSI in the context of gastric surgery. Thus, we performed a prospective cohort study to determine the incidence and risk factors of SSI in Korean patients undergoing gastric surgery. MATERIALS AND METHODS: A prospective cohort study of 2,091 patients who underwent gastric surgery was performed in 10 hospitals with more than 500 beds (nine tertiary hospitals and one secondary hospital). Patients were recruited from an SSI surveillance program between June 1, 2010, and August 31, 2011 and followed up for 1 month after the operation. The criteria used to define SSI and a patient's risk index category were established according to the Centers for Disease Control and Prevention and the National Nosocomial Infection Surveillance System. We collected demographic data and potential perioperative risk factors including type and duration of the operation and physical status score in patients who developed SSIs based on a previous study protocol. RESULTS: A total of 71 SSIs (3.3%) were identified, with hospital rates varying from 0.0 - 15.7%. The results of multivariate analyses indicated that prolonged operation time (P = 0.002), use of a razor for preoperative hair removal (P = 0.010), and absence of laminar flow in the operating room (P = 0.024) were independent risk factors for SSI after gastric surgery. CONCLUSIONS: Longer operation times, razor use, and absence of laminar flow in operating rooms were independently associated with significant increased SSI risk after gastric surgery.
Centers for Disease Control and Prevention (U.S.) ; Cohort Studies* ; Cross Infection ; Hair Removal ; Humans ; Incidence* ; Korea ; Multivariate Analysis ; Operating Rooms ; Prospective Studies* ; Risk Factors* ; Tertiary Care Centers