Dental Journal of Iwate Medical University

We evaluate the effect of the light intensity and powder/liquid ratio on bleaching efficiency of the Hi-lite vital bleaching system using a hematoporphyrin stained model. Hi-Lite paste was mixed in the powder/liquid ratios that should be 1:2 and 1:3, and placed onto the filter paper stained with 0.1% hematoporhyrin alcohol solution. The specimen was left for 3 minutes. Visible light (irradiances of 300 or 600mW/cm²) was applied to the paste for 3 minutes. The control specimen was left for 3 minutes without light irradiation. The color difference (ΔE) values between the stained paper and bleached paper were calculated. The higher light intensity, the increased liquid ratio, and the interaction between the higher light intensity and the increased liquid ratio increased the bleaching efficiency of the Hi-Lite.

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The presence of fungi was histologically detected in marginal periodontitic and dental carious lesions in two cases. Two teeth with dental caries and marginal periodontitis were extracted and fixed with formalin. These teeth were decalcified and prepared for histological examinations. Grocott stain disclosed the brown pseudohyphae of Candida albicans with plaques in carious lesions and on the surface of dental roots with periodontitis. These morphological findings showed that C. albicans was present in not only marginal periodontitis but also in dental caries lesion in some conditions.

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The central diabetes insipidus is a disease which causes the parasecretion of antidiuretic hormone through the degeneration of hypothalamus and the posterior-lobe-of-hypophysis system, and makes polyuria, the polyposia, and dipsesis the cardinal symptoms. For this reason, a critical complication may be caused to into the trap from the edema because of the water intoxication by oliguria, a generalized seizure, and the electrolyte imbalance by polyuria. We experienced the general anesthesia management of a patient who has central diabetes insipidus. A 25-year-old male patient (height 168cm, weight 50kg), diagnosed with a left side fracture of the mandible, was scheduled for open reduction pexia under general anesthesia. Anesthesia was induced with propofol and maintained with N_2O, O_2 and sevoflurane. During the operation the patient was kept on controlled ventilation monitoring by percutaneous SpO_2, arterial blood gas analysis, etc., and furthermore, had the central venous pressure meosured as one of the indexes of body fluid management. But the oliguria trend was accepted during the operation. So self-sustaing administration of the prostagrandin E1 and the furosemide of the diuretic of a loop system was prescribed for the patient, because the oliguria has not improved although management through a transfusion load was tried. It is important to take great care of the management of a patient with diabetes insipidus with regard to fluid balance, urine volume and electrolytes management.

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