Analysis of the data confirmed the occurrence of asymptomatic infarcts due to vasospasm. These infarcts often developed in noneloquent areas representing perforator territory. MRI investigation of vasospastic lesions referable to intraparenchymal vessels such as perforators complements the study of extraparenchymal major vessel vasospasm in patients with SAH by computed tomographic angiography.

We studied maxillofacial fractures treated by departments of oral and maxillofacial surgery in Tokyo. A retrospective review of records and radiographs for patients admitted during the 5‐year period from 2000 to 2004 was conducted at five departments in Tokyo. Date, age, gender, cause of injury, fracture site, concomitant injury, domestic violence against women, and treatment were reviewed. 674 patients with maxillofacial fractures were admitted. Male‐to‐female ratio was 3.6 : 1. The most frequent age group was 21–25 years. Fractures of the mandible were most frequent (87%), followed by the maxilla (14%) and the zygomatic bone (12%). Thirty‐one percent of fractures were due to traffic accidents, 29% to accidental falls, 23% to violence and 14% to sports. The incidence of maxillofacial fractures caused by traffic accidents was lower, and that caused by falls and violence were higher than in other countries. Seventeen percent of the maxillofacial fracture patients had concomitant injuries. The incidence of domestic violence‐related maxillofacial fracture was 1.6% of all cases. These cases were mainly caused by a husband (55%) or a sexual partner (36%). Most patients (67%) were treated by open reduction surgery. However, condylar fracture alone was usually treated by closed reduction surgery.

In order to improve present iron ore agglomeration processes drastically and meet the demands of future trends in iron ore resources suitably, a new agglomeration process named the Hybrid Pelletized Sinter process was studied. On the basis of a prior experimental study and the semi-commercial plant trial, a No. 4 GasFlow Characteristics in Agglomeration ProcessIn an agglomerating plant using the grate system, the control of gas flow passing through the bed is extremely important because it directly affects the productivity and the yield. Recent studies on the sintering process indicate that in the raw material charging unit, avalanches caused by stickiness and repose angle of the quasi-particles occur periodically along the moving direction of the grate. The productive yield of the sinter is reduced by these avalanches.15) This is attributed to the fact that as permeability in the sintering bed changes locally, due to these avalanches, gas flow fluctuates along the bed depth.In order to prevent the avalanches, various charging devices are being studied.15,16) Bycontrast, the HPS process has the following superior characteristics, in comparison with sintering process: (1) The green pellets are more spherical comparedto the quasi-particles.( 2) Since the surface of the green pellets is covered C 1993 ISIJ ISIJ International, Vol. 33 (1993)

The outcomes here suggest that excessive mechanical stress, particularly compressive mechanical stress, may significantly affect morphological bone change findings in the TMJ.

Our results show that age is a significant factor influencing the occurrence of complications in the early stages after dental implant placement. Therefore, clinicians should consider this factor when developing their treatment strategies.

Various kinds of fatty acid esters of l-ascorbic acid were synthesized and their role as chain-breaking antioxidant was studied in the oxidation of methyl linoleate in homogeneous solution. Fatty acid esters of ascorbic acid at either 6- or both 5- and 6-positions were effective as antioxidant and suppressed the oxidation of methyl linoleate, whereas those having ester group at 2-position did not act as antioxidant. 5,6-Erythorbyl dipalmitate was also effective as an antioxidant. Ascorbic acid esters inhibited the oxidation cooperatively with α- and δ-tocopherols as observed for free ascorbic acid. The antioxidant activity was correlated with the reactivity toward galvinoxyl radical.

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