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불화음용수 섭취에 따른 백서골의 미세특성 및 결정구조 비교분석
사공억,김지영,송재상,권용훈,송근배 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.1
The wide spread use of various vehicles for systemic or topical delivery of fluoride is undoubtedly responsible in large part for the remarkable decline in the prevalence of dental caries that is currently being experienced in many countries of the western world. But the effects of fluoride on bone health has been not completely confirmed still now. The aims of this study were to understand the micro-chemical and mechanical changes and the effects of the fluoride on rat femur after administration of various concentrations of fluoride. The three point bending test, surface micorhardness test, fluoride analysis, FT-Raman spectrophotometer and scanning electron microscopy were performed. The obtained results ware as follows; 1. Bone strength was increased significantly in the 5 and 25ppm group compared to control and 1ppm group. On the other hand, there was a significant decrease of stress at fracture in 75ppm group than 25ppm group(p<0.005). 2. Surface microhardness of the femur were also increase in the 1,5 and 25ppm groups than control and decreased at 75ppm group, but there were no significant differences in all the group(p<0.05). 3. With increasing the concentration of administrated fluoride, contents of fluoride in the ashed femur were increased. It was the highest in the 75ppm group than other groups(p<0.05). 4. The change of hydroxyapatite to fluorrapatite structure was not differentiated by FT-Raman analysis.
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사공억 慶北大學校 齒科大學 1997 慶北齒大論文集 Vol.14 No.-
(Abstract) Abjectives : The objectives of this study were to invertigate the effect of low and high fluoride on microhardness and compositions of the rat bone. Methods : Forty-eight Sprague-Dawley strain female rate were divided into four groups, and they were supplied with 0, 1, 10 and 10ppm fluoride containing water for three and six weeks. Animals were killed and femur, tibia and mandible were dissected, The slabs of each bone were embedded in unsturated polyster for testing the surface microhardness with Vicker's Microhardness Tester. The ashed bone powerders were digested in the Aicd igestion Bomb. Calcium, magnesium and ferric ion were determined using the ICP emission Spectrophotometer. Data analyis were conduct using the SAS packeage. Differences in each group were compared by one-way ANOVA and Duncan's multiple range test. Corresponding p-values were considered significant at values < 0.05. Results : There was no significant growth disturbance due to administraction of fluoride from 0 to 100ppm during 6 weeks of ecperiment. There were significant increases of suface microbardness at femur and mandible of 3 weeks group, but not at tibia. The surface microhardness of femur, tibia and mandible were increased with increased concentration of fluoride at 6 weeks group. The contents of calcium, magnesium and ferric ion in the femur and tibia were higher at low fluoride group than high fluoride groups, but there were no statistical difference between low and high fluoride groups with calcium and ferric ion in the mandible. Conclusion : All of the findings presented support the maximum(100ppm) administraction of fluoride for six weeks did not affect the weight change of rats. Within the range of doses used in this experiment, there were increases of suface microhardness of theree kinds of bones due to higher fluoride level, We suggested that 1ppm of fluoride could increase the surface microhardness and calcium content in the bone better than 10 and 100 ppm of fluoride.
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이용오,문선혜,사공억 啓明大學校 醫科大學 1991 계명의대학술지 Vol.10 No.4
The authors have made on the frequency studies on the impacted tooth of 419 cases in the 252 patients, 170 males & 82 females. The survey has been undertaken to classify the impacted tooth of korean through panoramic view by means of frequency of the impacted tooth, sexual difference, age, jaw, impacted site and number of the impacted teeth. The results were obtained as follows: Possesive ratio of the impacted teeth was 16.3% by patients and average number of impacted teeth was 1.66. The number of average the impacted teeth was higher in female than male. In the relation of the impacted teeth by jaw region, mandible was higher than that of maxilla. The occurrence of the impacted teeth was the most highest in the 21-25 years grade. Most prevalent impacting teeth was third molar and to the next mesiodense, upper canine. In the relation of the possesive number of the impacted teeth, one case is most prevalent and to the next two cases.
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이용오(Yong Oh Lee),문선혜(Seon Hye Moon),서헤경(Hye Kyung Suh),장희숙(Hee Suck Jang),사공억(Uck Sa Gong),박노부(No Bu Park) 대한구강악안면외과학회 1993 대한구강악안면외과학회지 Vol.19 No.1
Gingival fibromatosis which represents a fibrous hyperplasia of the gingival tissue is relatively uncommon benign oral condition. Characteristically, the firm enlarged gingival tissue often obscure the anatomic crowns of the teeth. They may deform palatal contours and subsequently crowd the tongue with a resultant interferance in speech and mastication as well as inability to maintain normal lip closure. Numerous examples not accompanied by ingestion of dilantin sodium, hypertrichosis, hereditary factors, cherubism, or ectodermal dysplasia have been generally labeled idiopathic . Although it has been stated that the treatment of choice is surgical removal of the enlarged tissues, there is a tendency for the condition to recur within a few years. The patient, 21-year-old female, was admitted to department of dentistry, Dong San Hospital, Keimyung University with the chief complaint of mastication difficulty and cosmetic problem-elephantiasis gingivae. She showed severe fibrous enlargement of maxillary and mandibular attached and nonattached gingivae. The gingival tissues generally were firm and dense, and the teeth were covered with dense, fibrous tissues, and this tissues may interfere with eruption. There was an operation history of excision of excessive gingival enlargement at five year old. She was diagnosed empty sella syndrom with partial hypopituitarism at endocrine tests. We got the good results in esthetics and functions by extraction of all teeth and surgical excision of the hyperplastic gingival tissue followed by complete dentures.
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