PURPOSE: The purpose was to compare the marginal fidelity and the fracture resistance of the zirconia crowns according to the various coping designs with different thicknesses and cement types. Material and METHODS: Zirconia copings were designed and fabricated with various thicknesses using the CAD/CAM system (Everest, KaVo Dental GmbH, Biberach., Germany). Eighty zirconia copings were divided into 4 groups (Group I: even 0.3 mm thickness, Group II: 0.3 mm thickness on the buccal surface and the buccal half of occlusal surface and the 0.6 mm thickness on the lingual surface and the lingual half of occlusal surface, Group III: even 0.6 mm thickness, Group IV: 0.6 mm thickness on the buccal surface and the buccal half of occlusal surface and the 1.0 mm thickness on the lingual surface and the lingual half of occlusal surface) of 20. By using a putty index, zirconia crowns with the same size and contour were fabricated. Each group was divided into two subgroups by type of cement: Cavitec(R) (Kerr Co, USA) and Panavia-F(R) (Kuraray Medical Inc, Japan). After the cementation of the crowns with a static load compressor, the marginal fidelity of the zirconia crowns were measured at margins on the buccal, lingual, mesial and distal surfaces, using a microscope of microhardness tester (Matsuzawa, MXT-70, Japan, x100). The fracture resistance of each crown was measured using a universal testing machine (Z020, Zwick, Germany) at a crosshead speed of 1 mm/min. The results were analyzed statistically by the two-way ANOVA and oneway ANOVA and Duncan's multiple range test at alpha= .05. RESULTS: Group I and III showed the smallest marginal fidelity, while group II demonstrated the largest value in Cavitec(R) subgroup (P < .05). For fracture resistance, group III and IV were significantly higher than group I and II in Cavitec(R) subgroup (P < .05). The fracture resistances of Panavia-F(R) subgroup were not significantly different among the groups (P > .05). Panavia-F(R) subgroup showed significantly higher fracture resistance than Cavitec(R) subgroup in group I and II (P < .05). CONCLUSION: Within the limitation of this study, considering fracture resistance or marginal fidelity and esthetics, a functional ceramic substructure design of the coping with slim visible surface can be used for esthetic purposes, or a thick invisible surface to support the veneering ceramic can be used depending on the priority.
Cementation ; Ceramics ; Collodion ; Crowns ; Esthetics ; Japan ; Zirconium

Holostephanus metorchis (Digenea: Cyathocotylidae) is a patrrasite of birds, transmitted by freshwater fishes. H. metorchis adults were recovered from chicks experimentally infected with metacercariae collected from freshwater fishes, Pseudorasbora parva. The metacercariae were oval, surrounded with thick fibrous capsules. In adult flukes, the holdfast organ occupied the ventral concavity, and the anterior testis did not reach the level of the ventral sucker. Based on these morphological characteristics, these flukes were identified as H. metorchis.
Animals ; Chickens ; Cyprinidae/*parasitology ; Fish Diseases/*parasitology ; Fresh Water/parasitology ; Korea ; Trematoda/anatomy & histology/classification/cytology/*isolation & purification ; Trematode Infections/parasitology/*veterinary

Microphallus species occur primarily as intestinal parasites of birds and mammals, and metacercariae of a new species belonging to this genus have been discovered from the crab, Macrophthalmus dilatatus, in the Republic of Korea. The metacercaria of this fluke was round with 2 thick walls, and the excysted one had mature genital organs. The adult flukes recovered from experimentally infected chicks had numerous intrauterine eggs, well-developed pars prostatica, widely bifurcating ceca, and prominent uterine bulge. After observing internal structures, it was concluded that this species is different from any other known Microphallus spp. Based on the morphology of metacercariae and adult flukes, we describe this specimen as a new species, Microphallus koreana n. sp.
Animals ; Brachyura/*parasitology ; Chickens ; Rats ; Trematoda/*anatomy & histology/*classification/isolation & purification ; Trematode Infections/parasitology/transmission

Hypertrophic osteoarthropathy(HOA) is a systemic disorder primary affecting the bones, joints, and soft tissues and characterized by several(or all) of the followings ; 1) Clubbing of digits, 2) Persistent new bone formation particulary involving long bones of the distal extremites, 3) Symmetric arthritis-like changes in the joints and periarticular tissue, most commonly the ankles, knees, wrist, and elbows, 4) Increased thickness of the subcutaneous soft tissues in the distal one-third of the arms and legs, and 5) Neurovascular changes of the hands and feet, including chronic erythema, paresthesis, and increase sweating. Most of cases of HOA are secondary to intrathoracic neoplasms, while the remaining few cases are secondary to other disease in the chest or elsewhere. We experienced a case of HOA in association with lung abscess in 26-yr-old male and reported with a review of literatures.
Ankle ; Arm ; Elbow ; Erythema ; Foot ; Hand ; Humans ; Joints ; Knee ; Leg ; Lung Abscess* ; Lung* ; Male ; Osteoarthropathy, Primary Hypertrophic ; Osteoarthropathy, Secondary Hypertrophic* ; Osteogenesis ; Sweat ; Sweating ; Thorax ; Wrist

The diffuse nodular lung lesion has a diagnostic problem and should be made differential diagnosis. A chest X-ray of 62-year-old male patient with dyspnea showed small-sized scattered multinodular lesion on entire lung field. Bronchoalveolar lavage and transbronchial needle aspiration showed the non-specific findings, so open lung biopsy was done and revealed bronchioloalveolar cell carcinoma.
Biopsy ; Bronchoalveolar Lavage ; Diagnosis, Differential ; Dyspnea ; Humans ; Lung Diseases* ; Lung* ; Male ; Middle Aged ; Needles ; Thorax

Animals ; Anoxia ; Bone Development ; Bone Marrow Cells ; Bone Remodeling ; Bone Resorption ; Cell Proliferation ; Fracture Healing ; Mice ; Osteoclasts ; Oxygen ; Periodontium ; Tooth Movement

Hypereosinophilic syndrome (HES) is characterized by a sustained eosinophilia of 1,500/mm3 or more in the absence of any known causes or the signs and symptoms of organ involvement. We report a 64-year-old man with HES initially presenting with involvement of the liver and bone marrow. Despite controlling the eosinophilia by corticosteroid, he developed a cerebral infarction and later progressive interstitial pneumonia. Brain angiography revealed a severe stenosis of the proximal right internal carotid artery (ICA) and a complete obstruction of the intracranial ICA. An open lung biopsy revealed fibrosis and lymphoplasma cell infiltration without eosinophils, which were consistent with nonspecific interstitial pneumonia.
Angiography ; Biopsy ; Bone Marrow ; Brain ; Carotid Artery, Internal ; Cerebral Infarction ; Constriction, Pathologic ; Eosinophilia ; Eosinophils ; Fibrosis ; Humans ; Hypereosinophilic Syndrome* ; Liver ; Lung Diseases, Interstitial ; Lung* ; Middle Aged