The questionnaires used in this study are useful for measuring patient satisfaction in the dental school hospital setting.
Quantitative analysis of the temporomandibular joint(TMJ)motion in patients with craniomandibular joint disorder was performed by means of magnetic resonance (MR) im aging. This study included. 134 patients(37 men and 97 women, mean age 34.0 years)having craniomandibular joint disorders diagnosed clinically and 16 healthy volunteers(14 men and 2 women, mean age 35.0 years). A 1.5 T superconductive MR unit(Signa Advantage, GE), 3-inch bilateral surface coils(as a receiver)and a body coil(as a transmitter)were used with the multiplanar gradient echo technique(MPGR). The obtained sagittal images were displayed in a closed loop cine fashion. The images were then digitized and transferred to a computer workstation (H 2050 G, Hitachi)for analysis of motion using original software. The results obtained were as follows: 1 ) Abnormalities of the disk position were identified in 82% of the patients. However, no malpositions of the disk were identified in 18% of the patients. 2) The cases with anterior disk displacement without reduction were associated with restriction of anterior translation of the condyle, and the motion of the opposite side was abnormal. 3) In the cases with disk displacement with reduction, the condylar paths were of the figure-of-eight shape. 4) The advantage of this analysis is that simultaneous evaluation of bilateral TMJ and accurate evaluation of condylar paths is possible.
Purpose To discuss the relationship between radiation bone injuries and a splitting of the cortical bone in the radiation field. Patients and methods Between January 1993 and September 1998, 53 patients with head and neck cancer received radiotherapy. The study cohort consisted of 23 patients who were followed with computed tomographic scans more than one year after radiotherapy. We evaluated clinical and computed tomographic features. Computed tomographic scanning was performed with a section thickness of 3 or 4 mm. Bone images were obtained with identical window width (4000 Haunsfield units) and window level (1000 Haunsfield units). Splitting of the cortical bone was defined as disappearance of bone density in the cortical bone, showing a linear shape running parallel to the surface of the cortex. Results Splitting appeared in 9 sites in 8 patients. All patients fulfilled UICC criteria for classifying oral cancer. Most of the patients received external irradiation with a total radiation dose of 50 or 60Gy. In all cases, splitting was found in the mandibular cortex at the site of muscle attachment, that was included in the radiation field. Appearance of bone changes in chronological order were periosteal reaction, splitting and bone necrosis. Conclusion We speculate that splitting results from injuries to bone structure cells cause d by blood flow disturbance after surgery and radiotherapy. It is suggested that such splitting can be a predictor of osteoradionecrosis.1. Wet-weight of the spleen showed a significant decrease one and three days after irradiation. Wet-weight of the liver did not show any significant change after irradiation.2. In spleen, the percentage of Thl-like cells showed a significant increase one and three days after irradiation, and one of the Th2-1ike cells showed a significant decrease one day after irradiation. The ratio of the Thl-like cells to Th2-1ike cells showed an extreme increase one and three days after irradiation. The absolute numbers of the Thl-like cells and the Th2-1ike cells showed a significant decrease one and three days after irradiation.In liver, the percentage of the Thl-like cells showed a significant increase one and three days after irradiation, and the percentage of the Th2-1ike cells did not show any significant change after irradiation. The ratio of the Thl-like cells to Th2-1ike cells showed a significant increase one day after irradiation.3. In spleen, the percentage of the Thl cells and Tcl cells showed a significant increase one and three days after irradiation, but neither of the absolute numbers showed any significant change after irradiation. These results indicated that the characteristic changes of Thl/Th2 balance shifted to a Thl-dominant status by irradiation, and the ability from irradiation therapy to the cell-mediated immunity were maintained.Purpose : Some simple bone cysts (SBC) have been reported as "atyical" or "unusual" because they showed marked bone expansion, radiopaque foci and so on. In this report, We examined whether such radiographic fea...
There have been many reports about the usefulness of CT in diagnosing cervical lymph node metastasis from oral cancer. With relatively high diagnostic accuracy, various diagnostic criteria have been used. This study evaluated CT images of cervical lymph node metastasis in patients with oral cancer using these criteria. Eighty-nine cases of various oral cancers (132 lymph node groups) were evaluated regarding cervical lymph node metastasis. In patients with nodes measuring over I cm in minimal axial diameter, 58.1% were metastatic (metastatic/total=47/74), while 17.2 % of patients with nodes measuring less than 1 cm in minimal axial diameter of lymph node were metastatic (10 / 58). As for other diagnostic criteria, in patients with spherical nodes, 38.7 % (metastatic/total=29/75), in patients showing ring enhancement, 70.4 % (19/27) and in patients with fusion, 75.0 % (3/4) were metastatic. In addition, in patients with spherical nodes measuring over 1 cm in minimal axial diameter, 59.5 % (22 / 37), in patients with nodes measuring over I cm in minimal axial diameter and showing ring enhancement, 78.3 % (18 / 23), in patients with spherical nodes showing ring enhancement, 60.0 % (9 / 15) and in patients with spherical nodes measuring over 1 cm in minimal axial diameter and showing ring enhancement, 64.3 % (9 / 14) were metastatic. In case of disappearance of fat layer (1 / 1), cancer infiltration of the surrounding tissue was seen. In conclusion, over 1 cm in minimal axial diameter, spherical node and ring enhancement were found to be appropriate diagnostic criteria. Furthermore, CT is essential in diagnosing cervical lymph node metastasis from oral cancer.Intravenous contrast enhancements were employed in eight cases at CT to evaluate the involvement of head and neck lesions at the neck artery and vein. Cases were branchial cyst, inflammation of the oral floor, a hemangioma, and five malignant tumors. A total of 100ml contrast enhancement media (240mg/ ml iodine) was injected using a automatic injector at a speed of 0.7~l.0ml/sec. A spiral CT (Somatom Plus, Siemens, Germany) was used in this study. Spiral scans with 3~5mm slice thichness and the table speed of 3~5mm/rotations were performed at data acquisition. Three scans were usually performed before, during, and just after enhancement. Images were reconstructed every one or two mm from the data during enhancement. The relations between the lesions and artery and vein were observed using cine-mode display. The results showed that 1) Involvement with malignant tumor: Two cases which were diagnosed as free from involvement with tumors at artery were correctly diagnosed in corresponding to clinical findings at surgery and follow-up examination. Other three cases were diagnosed as having tumors at the arteries. In case No.5, diagnosed as having tumor involvement, the external 6/ (61) carotid artery was shown at surgery to be free from infiltration. 2) Other diseases: CT images offer useful information about the vessels in cases of cyst or inflammation. High enhance...
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