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T Kurozumi

Publications and source records attributed to T Kurozumi.

At least 19 recordsLinked to original sources
PubMed2006

Occlusal interference during mastication can cause pathological tooth mobility.

BACKGROUND AND OBJECTIVE: Despite little evidence regarding the relationship between tooth mobility and nonworking contact, the evaluation of occlusion is performed mainly by the detection of premature and/or nonworking contacts during tapping movements and lateral excursion. The hypothesis of this study is that occlusal contact during mastication is potentially traumatic to periodontal tissue. It clarifies the relationship between chewing patterns and the status of periodontal tissue. MATERIAL AND METHODS: Subjects included 73 adults, 20-29 years of age (39 men and 34 women), with complete sets of teeth and no history of orthodontic treatment or periodontal disease. The closing chewing patterns of each subject were classified into three groups by the Masticatory Deviation Index, which depicts the deviation from the normal chewing patterns within 5 mm from the intercuspal position. Periotest was used to diagnose teeth mobility and the values were compared among the three groups. RESULTS: The present study indicates that the chewing movements which deviated from the normal chewing movements increased the mobility of specific types of teeth. CONCLUSION: The results of this study imply a relationship between chewing movements and tooth mobility and indicate that functional evaluation of occlusion is necessary for the examination of periodontal tissue. Occlusal evaluation with border and tapping movements might be insufficient, and functional occlusal evaluation during chewing movements can be clinically useful for using to evaluate periodontal tissue.

Adult↗
PubMed1995

[Treatment of advanced renal cell carcinoma with a combination of interferon alpha and gamma].

A total of 29 patients with advanced renal cell carcinoma entered a pilot study of combination therapy with interferon alpha (IFN-alpha) and interferon gamma (IFN-gamma). IFN-alpha (HLBI: 3 x 10(6) IU, BALL 1:5 x 10(6) IU, IFN-alpha-2a: 9 x 10(6) IU or IFN-alpha-2b: 6 x 10(6) IU) was given intramuscularly every day and IFN-gamma (IFN-gamma-1a: 3 x 10(6) JRU) was given intravenously by drip infusion 3 times a week (every 2-3 days). The treatment was continued for 3 months as the induction therapy, and then the tumor response was evaluated. Of the 22 evaluable patients, 4 achieved a partial response (PR), 10 showed no change (NC), and in 8 the disease had progressed (PD) during the therapy. Thus, the overall response rate was 18.2% [95% confidence interval (CI) 2.1-34.3%]. A favorable response tended to be obtained in patients with good performance status or small pulmonary metastases, or in those who had no prior therapy with IFN-alpha, who received this treatment immediately subsequent to radical nephrectomy, or who received IFN-gamma as much as possible according to this regimen. Toxicity was evaluated in 28 patients: fever, general fatigue, anorexia, leukocytopenia and impaired liver function were frequently noted, and 3 patients were withdrawn from the study because of such adverse effects. In patients who had a PR or NC, the same dosage of IFN-alpha was continued to be given intramuscularly 2-3 times a week (every 2-4 days) as the maintenance therapy.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1993

[Extracapsular tumor invasion in renal cell carcinoma: with special reference to limitation of surgical enucleation].

To elucidate the feasibility of surgical enucleation, the incidence of extracapsular tumor invasion in 30 cases of renal cell carcinoma with a diameter less than 5 cm was examined, based on the classification of extracapsular tumor invasion into three patterns, namely microinvasion, nodular invasion, and daughter tumors. Of the 30 cases of renal cell carcinoma, 22 cases (73%) revealed extracapsular tumor invasion. And the incidence of microinvasion, nodular invasion and daughter tumors was 7 cases (23%), 9 cases (30%) and 6 cases (20%), respectively. But the incidence of these three patterns of extracapsular tumor invasion correlated neither with the size of renal cell carcinoma nor with pT classification. There was a tendency for extracapsular tumor invasion to occur near the renal hilar site of the renal cell carcinoma, where the tumor vessels were rich, penetrated and twined around the tumor capsule, resulting in the disruption of the tumor capsule. These three patterns of invasion was located within 1 cm in distance from the tumor capsules in all cases. In conclusion, because of limited radicality achieved by tumor enucleation even in the case of pT1, partial nephrectomy was recommended in the presence of a normal contralateral kidney.

Carcinoma, Renal Cell↗
PubMed1993

[Preoperative embolization using absolute ethanol for renal cell carcinoma--including the questionnaire survey in Japan].

The usefulness of transvascular embolization before radical nephrectomy using absolute ethanol was studied in thirty-two cases with renal cell carcinoma, among them, 30 cases received radical nephrectomy one day after transvascular embolization. And a nation wide questionnaire survey regarding the embolization was also reported. These results were as follows: 1. The infarcted areas were very extensive and among 28 cases examined, 26 cases showed more than 75% of infarct in the whole area of the cortex. 2. Among 32 cases, 22 cases complained of no pain after the embolization using absolute ethanol only by the preventive epidural administration of analgesics. 3. The questionnaire survey showed that the embolization before radical nephrectomy was performed in 62% of the hospitals as a whole, including 81 hospitals (41%) in which the embolization was performed case by case. In the whole of hospitals, 21% performed the embolization principally by evaluating the significance of the embolization. On the other hand, 19% of the hospitals did not perform by the reason of no significance of the embolization on the treatment of renal cell carcinoma. As shown in this questionnaire survey, the significance of the embolization before radical nephrectomy was still debatable in our country. 4. In 62% of the hospitals where the embolization is carried out, as a whole, the period from embolization to the nephrectomy was 3-7 days. And in 42% of the hospitals as a whole absolute ethanol was principally used as an embolizing agent. In conclusion we believe that absolute ethanol was useful and should find further application as an embolizing agent before the radical nephrectomy.

Aged↗
PubMed1991

Prognostic factors and value of adjunctive nephrectomy in patients with stage IV renal cell carcinoma.

We reviewed 57 cases of Stage IV renal cell carcinoma to clarify the factors influencing prognosis and to evaluate the value of nephrectomy. Cumulative survival from the initial diagnosis was analyzed with respect to the patients' age, sex, side of primary tumor, initial performance status (PS), site of metastasis, and nephrectomy. Overall survival for the patients was 51 percent at one year, 22 percent at three years, and 11 percent at five years. Age, sex, and side of primary tumor had no influence on survival. Improved survival was correlated with good PS, metastases limited to single organ, and removal of the primary tumor. With regard to histopathologic features in nephrectomized patients, low grade and stage were correlated with longer survival. These factors should be considered in the analysis of results of future clinical trials of metastatic renal cell carcinoma.

Aged↗
PubMed1991

[The significance of bacillus Calmette-Guerin in the therapy of carcinoma in situ of the bladder].

We treated ten patients with carcinoma in situ of the bladder (primary type, 6 and secondary type, 4) by intravesical bacillus Calmette-Guerin therapy. All patients received 8 weekly instillation, and among them 3 patients were followed by additional instillation monthly for 7 months. Complete regression (negative biopsies and cytology study) was observed after 8 weekly instillation in all patients. To elucidate the mechanism of action of BCG on carcinoma in situ, the biopsied specimens after BCG instillation were examined light and electronmicroscopically. It was speculated that BCG might act on cancer cells in two ways: one was sloughing and denudation of the cancer cells by acute tuberculous cystitis, and the other was a role of the macrophages through immune reaction. In our study, the toxicity and complications seemed to be much severer than previously reported. Vesicoureteral reflux was observed in 6 patients. Decreased bladder capacity noted in all patients, among them radical cystectomy and colocystoplasty were performed in 2 patients under the diagnosis of bladder contracture. Although complete regression was observed in all patients after 8 weekly BCG instillation, the duration being free from cancer cells was variable. And we also discussed on the additional therapy in such patients in the literature.

Administration, Intravesical↗
PubMed1990

Dissecting aneurysm: a clinicopathologic and histopathologic study of 111 autopsied cases.

One hundred eleven autopsy cases of dissecting aneurysm were collected from western Japan. The ratio of males to females was 3:2 and the sixth and seventh decades of life were most frequently affected. All 11 cases of Marfan's syndrome were in patients under 40 years of age. DeBakey's type III dissections showed a male predilection and more severe atherosclerosis than in control cases. Many patients with types I and II dissections died of hemorrhage in the acute phase, while many patients with type III dissection died in the subacute or chronic phase, and half of the patients died of diseases other than hemorrhage. Hypertension was recognized in 73.7% of the 95 cases which showed no other obvious risk factors. Histologic examinations suggested that cystic medial necrosis was related to the pathogenesis of the disease in Marfan's syndrome, but was not so apparent in non-Marfan's syndrome. Laminar medial necrosis was found in many cases, but was considered to be a secondary ischemic change following dissection, as supported by other investigators. There were only a few cases in which dissection seemed to be directly caused by atherosclerosis.

Adolescent↗
PubMed1985

Carcinosarcoma of the prostate.

The present report describes a rare prostatic tumor occurring in a 78-year-old Japanese male. The histological features were those of carcinosarcoma involving an adenocarcinoma and a chondrosarcoma, with metastasis to the liver. The carcinomatous component stained positively for prostatic acid phosphatase (PAP) by an immunoperoxidase technique. The literature is reviewed.

Adenocarcinoma↗
PubMed1984

Permeation and deposition of fibrinogen and low-density lipoprotein in the aorta and cerebral artery of rabbits--immuno-electron microscopic study.

The localization of fibrinogen and low-density lipoprotein (LDL) in the arterial wall has been studied to determine whether they mediate the effects of hypertension and/or hypercholesteraemia on atherogenesis. In untreated control rabbits, fibrinogen was localized in the caveolae and vesicles of the endothelial cells and in the subendothelial spaces of the aorta. No fibrinogen was found in the subendothelial spaces of the cerebral artery. Hypertension or hypercholesteraemia was accompanied by enhanced insudation of fibrinogen into the subendothelial spaces of the aorta and cerebral artery, and fibrinogen deposition was most prominent in the hypercholesteraemic rabbits with induced renovascular hypertension. The insudation of fibrinogen appeared to occur by way of vesicular transport, and to some extent by junctional transport. In the untreated control rabbits, LDL was localized only in the caveolae and vesicles of endothelial cells in both aorta and cerebral artery. LDL was deposited in the subendothelial space of the aorta of hypercholesteraemic rabbits with or without hypertension, and in the cerebral artery of hypercholesteraemic rabbits with hypertension. These findings suggest that fibrinogen insudates into the intima of the aorta and cerebral artery both during hypertension and hypercholesteraemia, and that LDL insudation into the intima of the aorta in hypercholesteraemia is accentuated by hypertension. LDL insudated into the intima of the cerebral artery in the presence of hypercholesteraemia linked to hypertension. Thus, hypertension plays a significant role in the pathogenesis of cerebral atherosclerosis.

Animals↗
PubMed1983

Is isoniazid-hepatotoxicity induced by the metabolite, hydrazine?

The effects of rifampicin (RMP) on isoniazid (INH) metabolism in rabbits were examined from the viewpoint of extensive hepatitis. After the RMP pretreatment, no remarkable changes were observed in the plasma levels of INH as well as its metabolites, acetylisoniazid (AcINH), acetylhydrazine (AcHz) and diacetylhydrazine (DAcHz) with the exception of hydrazine (Hz). After an oral administration of INH or Hz hydrate, the stochastic examination showed that the AUC0-8hr values of Hz plasma levels in RMP pretreated groups were significantly less than those in the control rabbits. RMP treatment was also shown to induce rabbit liver cytochrome P-450 activity. Histological studies demonstrated that Hz causes more remarkable hepatic necrosis in rabbits pretreated with RMP than in the control rabbits. These observations could suggest that Hz is a key intermediate of INH-hepatitis through the transformation of some hepatotoxic species by microsomal oxidation that is facilitated by RMP.

Animals↗
PubMed1983

Monocrotaline-induced renal lesions.

Monocrotaline, an alkaloid obtained from Crotalaria spectabilis, provides an experimental model for studies of mesangiolysis as seen in Habu venom poisoning and hemolytic-uremic syndrome. Renal lesions induced in rats by a single intraperitoneal administration of monocrotaline were examined by light and electron microscopy. Two weeks after the injection glomerular capillaries showed focal endothelial cell detachment and adhesion of platelets to the basal lamina. At 3 weeks there was no endothelial denudation but the mesangium was severely edematous. Mesangiolysis occurred at 4 weeks, accompanied by dilatation or obliteration of capillaries and necrosis and hemorrhage in the mesangium. Insudation of plasma constituents facilitated by the endothelial injury appeared important in the pathogenesis of mesangiolysis. Fusion of capillaries seemed to lead to capillary aneurysmata and necrosis of the mesangium. These glomerular lesions induced by monocrotaline were similar to those of Habu venom poisoning or hemolytic-uremic syndrome.

Animals↗
PubMed1983

Effects of hypertension and hypercholesteremia on the permeability of fibrinogen and low density lipoprotein in the coronary artery of rabbits. Immunoelectron-microscopic study.

In an attempt to elucidate the effects of hypertension and/or hypercholesteremia on atherogenesis, with special reference to permeation and deposition of fibrinogen and low density lipoprotein (LDL) in the coronary artery, we studied electron-microscopically the localization of fibrinogen and LDL. In the untreated control rabbits, fibrinogen was localized in the caveolae and vesicles of the endothelial cells and in very small amounts in the subendothelial spaces of the coronary artery. Hypertension or hypercholesteremia was related to an enhanced insudation of fibrinogen into the subendothelial spaces of the coronary artery. The insudation of fibrinogen seemed to have occurred by way of vesicular transport and, to some extent, by junctional transport. LDL was localized only in the caveolae and vesicles of the endothelial cells of the coronary artery in the untreated control rabbits. LDL was deposited in the subendothelial space of the hypercholesteremic rabbits, with or without hypertension. Despite the lack of clear-cut and direct evidence, the insudation of LDL into the intima appeared to be enhanced by way of vesicular transport.

Animals↗
PubMed1983

Differential registration of two types of radionuclides on macroautoradiograms for studying coronary circulation: concise communication.

Double-radionuclide autoradiography proved to be feasible using combinations of Tc-99m and I-125, or Tc-99m and C-14. Because of the short half-life of Tc-99m (6 hr), we first registered Tc-99m on x-ray film. Given an adequate Tc-99m:I-125 activity ratio of 20:1, the exposure duration for Tc-99m was still too short for I-125 to blacken the x-ray film. The pure emission from C-14 is completely absorbed by a thin aluminum sheet--hence no problem there. After the decay of Tc-99m, therefore, it was entirely feasible to continue autoradiography with I-125 (T1/2 = 60.2 days) or C-14 (T1/2 = 5730 yr). Based on these conditions, we applied (a) tracer microspheres labeled with I-125 and Tc-99m to define the respective perfusion areas of the left anterior descending, septal, and left circumflex coronary arteries of the beating heart, and (b) Tc-99m pyrophosphate and C-14 antipyrine to demarcate respectively the localization of the infarct-avid substance and the regional blood flow. We verified the first procedure with postmortem angiography and the second with histochemistry.

Angiography↗