PURPOSE: This study was to investigate how the crestal module design could affect the level of marginal bone stress around dental implant. MATERIALS AND METHODS: A submerged implant of 4.1 mm in diameter and 10 mm in length was selected as baseline model (Dentis Co., Daegu,Korea).A total of 5 experimental implants of different crestal modules were designed (Type I model : with microthread at the cervical 3 mm, Type II model : the same thread pattern as Type I but with a trans-gingival module, Type III model: the same thread pattern as the control model but with a trans-gingival module, Type IV model: one piece system with concave transgingival part, Type V model: equipped with beveled platform). Stress analysis was conducted with the use of axisy mmetric finite element modeling scheme. A force of 100 N was applied at 30 degrees from the implant axis. RESULTS: Stress analysis has shown no stress concentration around the marginal bone for the control model. As compared to the control model, the stress levels of 0.2 mm areas away from the recorded implant were slightly lower in Type I and Type IV models, but higher in Type II, Type III and Type V models. As compared to 15.09 MPa around for the control model, the stress levels were 14.78 MPa, 18.39 MPa, 21.11 MPa, 14.63 MPa, 17.88 MPa in the cases of Type I, II, III, IV and V models. CONCLUSION: From these results, the conclusion was drawn that the microthread and the concavity with either crestal or trans-gingival modules maybe used in standard size dental implants to reduce marginal bone stress.
Axis, Cervical Vertebra ; Dental Implants ; Implants, Experimental

Salmonella infected aneurysm of aorta is one of the local complications by systemic salmonellosis. We have experienced a case of the rupture of infected abdominal aortic aneurysm in 47-year old man. He was admitted because of 39degrees C fever, abdominal pain, back pain of 7 day's duration. Diabetes mellitus had been diagnosed previously, but not managed. Abdominal CT scans showed aneurysmal dilatation with periaortic air bubbles and severe atherosclerotic change of abdominal aorta from renal hilum to the iliac bifurcation level. Blood cluture yielded Salmonella group B strains. He was treated with intravenous ceftriaxone, metronidazole, ciprofloxacin. On the seventh hospital day, the patient showed sign of shock with blood pressure 80/60 mmHg and comatous conciousness. Abdominal CT scans revealed the rupture of infected aneurysm of abdominal aorta just superior to the iliac artery bifurcation. The patient had not underwent surgery, then he was expired.
Abdominal Pain ; Aneurysm ; Aneurysm, Infected* ; Aorta ; Aorta, Abdominal* ; Aortic Aneurysm, Abdominal ; Back Pain ; Blood Pressure ; Ceftriaxone ; Ciprofloxacin ; Diabetes Mellitus ; Dilatation ; Fever ; Humans ; Iliac Artery ; Metronidazole ; Middle Aged ; Rupture ; Salmonella ; Salmonella Infections* ; Shock ; Tomography, X-Ray Computed

Salmonella infected aneurysm of aorta is one of the local complications by systemic salmonellosis. We have experienced a case of the rupture of infected abdominal aortic aneurysm in 47-year old man. He was admitted because of 39degrees C fever, abdominal pain, back pain of 7 day's duration. Diabetes mellitus had been diagnosed previously, but not managed. Abdominal CT scans showed aneurysmal dilatation with periaortic air bubbles and severe atherosclerotic change of abdominal aorta from renal hilum to the iliac bifurcation level. Blood cluture yielded Salmonella group B strains. He was treated with intravenous ceftriaxone, metronidazole, ciprofloxacin. On the seventh hospital day, the patient showed sign of shock with blood pressure 80/60 mmHg and comatous conciousness. Abdominal CT scans revealed the rupture of infected aneurysm of abdominal aorta just superior to the iliac artery bifurcation. The patient had not underwent surgery, then he was expired.
Abdominal Pain ; Aneurysm ; Aneurysm, Infected* ; Aorta ; Aorta, Abdominal* ; Aortic Aneurysm, Abdominal ; Back Pain ; Blood Pressure ; Ceftriaxone ; Ciprofloxacin ; Diabetes Mellitus ; Dilatation ; Fever ; Humans ; Iliac Artery ; Metronidazole ; Middle Aged ; Rupture ; Salmonella ; Salmonella Infections* ; Shock ; Tomography, X-Ray Computed

BACKGROUND: Cervical tuberculous lymphadenopathy is a very common disease with a similar incidence to pulmonary tuberculosis. Dendritic cells play a role of initial antigen presentation of this illness. Nevertheless, the precise role of these antigen-presenting cells according to the clinical features in unclear. The aim of this study was to determine the clinical implication of dendritic cell infiltration in the cervical lymph nodes. METHODS: A review of the clinical characteristics was carried out retrospectively based on the clinical records and radiography. Immunohistochemical staining was performed on the available histology specimens of 72 cases using the S-100b polyclonal antibody for dendritic cells. The number of dendritic cells with tuberculous granuloma were determined. A x2 test, unpaired T test and multiple logistic regression analysis were performed. RESULTS: Thirty percent of subjects had previous or concurrent pulmonary TB. Twenty one percent of cases showed a positive reaction on the AFB stain. Within a granuloma, the number of infiltrated dendritic cells was 113.0+/-7.0. The incidence of fever and cough decreased with increasing infiltration of dendritic cells Multivariate regression analysis showed that the infiltration of dendritic cells could significantly contribute to fever. CONCLUSION: Overall, dendritic cells can control a Mycobacterium tuberculosis infection and modulate the immune response, as well as resolve the clinical manifestations of TB lymphadenopathy.
Antigen Presentation ; Antigen-Presenting Cells ; Cough ; Dendritic Cells* ; Fever ; Granuloma ; Incidence ; Logistic Models ; Lymph Nodes ; Lymphatic Diseases ; Mycobacterium tuberculosis ; Radiography ; Retrospective Studies ; Tuberculosis ; Tuberculosis, Lymph Node* ; Tuberculosis, Pulmonary