Although commercial soft lining materials are applied as functional impression materials or tissue conditioning materials except their original application, these materials are widely used to reduce the occlusal force against the residual ridge in short or long term period. In this study, we made an impact force test machine with 4 types of residual ridge form (0 degree, 30 degree, 45 degree, and 60 degree) and experimented the impact force test to 4 commercial soft lining materials (Visco-gel, Soft-liner, Evatouch S, and Evatouch H). Thickness of test pieces of each material was 1mm, 2mm, and 3mm. We evaluated the impact reduction rate of each material and discussed. The results were as follows ; 1. Impact reduction rates were increased significantly by increasing the thickness in all materials. 2. Impact reduction rates of the same thickness were almost same in all materials. 3. There was no influence to impact reduction rate by changing of residual ridge form. 4. Impact reduction rates of acrylic materials at 7 days after dipping water were almost same at 1 day after dipping water. 5. Impact reduction rates of silicone materials at 4 weeks after dipping water were almost same at 1 week after dipping water. These results suggested that there was no need to change the thickness of soft lining materials by type of materials or form of residual ridge, and 2mm of thickness was clinically the best lining method for any soft lining materials.

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Zinc (Zn) has been known to be an essential metal and is very important for growth and cell division. Zn is required for activities of more than 300 enzymes. In our previous studies, we used rats to study the effect of low intakes of zinc and calcium on the growth and development in tibia metaphysis. However we have no report on the enzyme for cofactor zinc in rats. Twenty, three-week-old male Wistar rats were divided into groups and randomly given a diet containing different levels of zinc (adequate Zn level 34.4ppm), high-Zn diet (Zn level 51.4ppm), low-Zn diet (14.7ppm), and Zn-deficiency (Zn level 3.7ppm) for 6 weeks. We examined the properties of the enzyme for cofactor zinc enzyme (alkaline phosphatase and Cu, Zn superoxide dismutase) in serum, liver and salivaly glands. 1. Serum concentrations of Zn did not show a significant difference among the four groups. 2. In the high-Zn and low Zn diet groups, alkaline phosphatase activity in serum and liver was increased in conparison to the control group, however, in submandibular glands and sublingual glands it was decreased as compared with the control group. 3. The Cu, Zn-superoxide dismutase activity in liver did not show a significant difference among the four groups. In the low-Zn and Zn deficiency diet groups, the type of Cu, Zn-Super oxide dismutase activity in submandibular glands was decreased as compared with the control group ; on the other hand, in the high-Zn, low-Zn and Zn deficiency diet groups, Cu, Zn-superoxide dismutase activity in sublingual glands and parotid glands was decreased as compared with the control group. These results suggested that the enzyme activities of alkaline phosphatase and type of Cu, Zn-superoxide dismutase were not dependent on the level of zinc present in the diet of each of the four groups, particularly under normal physiological zinc levels.

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The OSCE Trials at Kyushu Dental College for 86 and 94 of fifth year students were individually performed on March 15 and December 6, 2003. The first trial consisted of 5 stations (medical interview, instruction of tooth brushing, rubberdam dry field technique, alginate impression technique, tooth extraction). The second trial consisted of 7 stations (medical interview, dental X-ray film mount, filling of composite resin, root canal treatment, tooth preparation, explanation of the orthodontic appliance, check the vital sign). The average score was 79.4 point in the first and 80.4 point in the second trails, respectively. The average score in clinical skill was lower than that in the medical interview and explanation of the orthodontic appliance. Also, the average score in clinical skill was affected by place and the order of the examination.

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This is the life story of Dr. Masaomi Kuninaga, the founder of Kyushu Dental College, from birth until graduation from Takayama Dental College, the first dental college in Japan.

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It is important for the medical treatment of fracture of the mandible to perform suitable medical treatment promptly. We report a case of deep neck infection due to fracture of the mandible. The patient was a 67-year-old woman with swelling in the submandibular region. She was admitted on an emergency basis at her first visit because of the swelling of the front cervical region, severe pain on swallowing, fervescence, trismus, and general fatigue. Fracture of the mandible was recognized in a bilateral jaw joint region and right lower jaw in the figure panorama X ray at the time of the first medical examination of this department Computed tomography (CT) demonstrated a large neck ab s cess involving the front cervical region. Surgical incision and drainage of the space were performed in addition to antibiotic administration. However, symptoms rapidly exacerbated the following day. CT demonstrated a diffuse collection of submandibular space fluid. A second drainage of the left side neck space was performed. Although the improvement of an inflammatory view was achived, it continued. Fracture of the mandible and surgical drainage was surgically done under general anesthesia. Surgical drainage through a neck incision proved effective, and clinical symptoms rapidly resolved. In this patient, CT findings was useful remarkably in diagnosis and management of deep neck infection with regard to timing of surgical intervention.

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