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상악 유구치에서의 fourth canal 에 대한 연구
한강석,김창기,송광철,강덕일,정현구 朝鮮大學校 口腔生物學硏究所 2001 口腔生物學硏究 Vol.25 No.2
The main objective of endodontic therapy is the thorough mechanical and chemical clensing of the entire pulp cavity and its complete obturation with an inert filling material. However, the pulps of primary and permanent teeth respond differently to trauma, bacterial invasion, irritation and medication. The primary pulp responds more rapidly to the effects of dentinal caries than does the permanent pulp. so, pulp treatment of children, and purpose of pulp treatment in primary tooth is not only removal of inflamed pulp tissue, pain relief, but conservation of arch form. preservation of mastication, important to normal occlusal of relationship future permanent teeth. For successive pulp treatment in primary dentition, it is necessary to understand about pulp form of primery teeth, anatomy form of root canal, variation, root formation, and special problem relation to primary tooth resorption. But in pedodontics, now it is deficient to study of root canal and root form. Dentists have been treating maxillary first molars endodontically for years under the general assumption that these teeth have three root canals. Before an article written by Weine, virtually all dentist, thought of the mesiobuccal root (MBR) of the maxillary first molar as having only one canal. In upper primary molr, canal configuration of mesial root has the most variation same as upper molar. If not canal treatment is completely, most of all endodontic treatment should be failed. This study was to investigate the incidence of tourth canal of upper primary molar that extracted and case report.
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각종 치과레이저의 Streptococcus mutans에 대한 증식 기능억제 효과
한강석,국중기,유소영,김화숙,박종휘,박현동,이상훈 大韓小兒齒科學會 2003 大韓小兒齒科學會誌 Vol.30 No.3
레이저의 구강내 산 생성 세균인 S. mutans에 대한 증식 및 기능 억제효과를 평가하기 위하여 S. mutans KCTC 3065가 포함된 세균 pellet에 Er:YAG 레이저와 Nd:YAG 레이저를 비접촉식 방법으로, 조사세기 50mJ, 조사시간 5초, 그리고 pulse repetition rate를 각각 10Hz와 30Hz로 하여 조사하고 세균 군락수, 산 생성능, 불용성 세포외다당류의 합성량을 측정하여 다음과 같은 결과를 얻었다. 1. Chinese ink로 photosensitization을 시행한 후 Nd:YAG 레이저를 조사한 경우가 S. mutans의 증식을 가장 많이 억제하였으며 Er:YAG 레이저 조사도 증식을 억제하였다. Chinese ink를 사용하지 않고 ND:YAG 레이저를 단독으로 조사한 경우는 S. mutans의 증식을 억제하지 못하였다. 2. Chinese ink로 photosensitization을 시행한 후 Nd:YAG 레이저를 조사한 경우가 일정기간 동안 S. mutans의 산생성능을 가장 많이 억제하였으며 Er:YAG 레이저 조사도 산 생성능을 억제하였다. Chinese ink를 사용하지 않고 Nd:YAG 레이저를 단독으로 조사한 경우는 S. mutans의 산 생성능을 억제하지 못하였다. Er:YAG 레이저와 Chinese ink로 photosensitization을 시행한 후 Nd:YAG 레이저를 조사한 경우는 pulse repetition rate가 클수록 전반적으로 세균의 산생성능을 더 많이 억제하였다. 3. 레이저 조사는 S. mutans의 불용성 세포외다당류의 합성에 영향을 미치지 못하였다. 이상의 결과로 보아 Er:YAG 레이저와 Chinese ink로 photosensitization을 시행한 후의 Nd:YAG 레이저 조사는 일정시간 동안 S. mutans의 증식과 산 생성능을 억제시키므로써 치아우식증 예방효과를 얻을 수 있다고 사료되나 억제효과가 오래가지 않아 임상적으로 효과를 얻기 위해서는 자주 조사를 해주어야 한다는 문제점을 안고 있어 임상적으로 치아우식증 예방이란 단독 목적으로 사용하기에는 실용성이 크지 않다고 사료된다. This was performed to evaluate the inhibitory effect of laser on the growth of S. mutans. The bacterial pallets containing S. mutans KCTC 3065 were irradiated with Er:YAG laser and Nd:YAG laser by non-contact method at an intensity of 50mJ for 5 sec with the pulse repetition rates of 10Hz and 30Hz, respectively. The following results were obtained on colony count, acid producing ability, and the amount of insoluble extracellular polysaccharide synthesis. 1. The irradiation of Nd:YAG laser after photosensitization with Chinese ink inhibited the proliferation of S. mutans the most, and the irradiation of Er:YAG also inhibited the proliferation. However, the irradiation of Nd:YAG laser alone could not inhibited the proliferation of S. mutans. The pulse repetition rate did not affect significantly on the proliferation of bacteria in overall. 2. The irradiation of Nd:YAG laser after the photosensitization with Chinese ink inhibited the acid production of S. mutans the most for a certain period of time. Er:YAG laser also inhibited acid production. When Nd:YAG laser was used alone, the acid production of S. mutans was not been inhibited. The irradiation of Nd:YAG laser after photosensitization with Chinese ink inhibited the acid production ability of bacteria the most as the pulse repetition rate increased. 3. Laser irradiation did not inhibited the synthesis of insoluble extracellular polysaccharide of S. mutans. From these results, we conclude that the irradiatioin of Er:YAG laser and Nd:YAG laser after photosensitization with Chinese ink would inhibit the proliferation and acid production by S. mutans, which may prenent dental caries. However, this effect does not last long time so that the laser irradiation should be repeated frequently in order to obtain clinical effect; thus, this laser irradiation would not have a clinical usefulness in preventing dental caries when used solely.
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전기마취가 치아 및 치은조직의 동통억제에 미치는 영향에 관한 연구
이상호,한강석 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.1
The purpose of this study was to evaluate the effect of electronic anethesia on the pain threshold teeth and gingiva. The subjects for this study were 30 adolescents. The subjects were devided into three groups;the control group described by no electronic anethesia and the GroupⅠdescrived by experimental group measured immediately after electronic anesthesia and Group Ⅱ that measured 20 minutes after electronic stimulation is started. Electronic anesthesia using the 3M Dental Electronic Anesthesia System 8670 was done with external electrode pads that adhere to the skin surface. The following results were obtained ; 1. Pain threshold of gingiva in maxilla were 97.1g in control group, 143.1g in groupⅠ, and 161.6g in group Ⅱ. Pain threshold of groupⅠ, group Ⅱ were increased up to 47.3%, 66.3% compared to the control group. Pain threshold of gingiva in mandible were 75.1g in control group, 107.9g in groupⅠ, and 118.5g in group Ⅱ. Pain threshold of groupⅠ, group Ⅱ were increased up to 38.5%, 52.6% compared to the control group(P<0.05). 2. Pain response of teeth in maxilla showed that 53.3% of subjects responded no cold pain in group Ⅰ, 60% in groupⅡ, and 36.7% of subjects responded mild cold pain in groupⅠ, 33% in group Ⅱ. Pain response of teeth in mandible showed that 40% of subjects responded no cold pain in groupⅠ, 50% in group Ⅱ, and 46.6% of subjects responded mild cold pain in groupⅠ, 43% in group Ⅱ(P<0.05). 3. Pain threshold of gingiva in maxilla were higher than that of gingiva in mandible. Differences of pain thresholds between maxilla and mandible were higher in experimental group than in that of control group. And inhibitory effect of pain of teeth in maxilla were higher than that of mandible(p<0.05).
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한강석,이상호,최용성 大韓小兒齒科學會 1993 大韓小兒齒科學會誌 Vol.20 No.2
Dentinogenesis imperfecta is inherited as a single autosomal dominant trait. Clinical features of dentinogenesis imperfecta is one in which the primary and permanent teeth are a characteristic reddish brown to gray opalescent color. Enamel is usually brokedown and exposed soft dentin abrades rapidly. Radiographs show slender roots and bulbous crown. The pulp chamber is small and pulp canals are small and ribbon-like. A 8-year-old and 9-year-old brother with complaint of abnormal crown shape and color of the teeth came to department of Pediatric Dentistry for complete rehabilitation. Family history revealed the wearing the complete denture due to premature loss of permanent teeth is several relatives. The obtained results were as follow. 1. Teeth showed yellowish brown color. The crown of teeth showed severe attrition and breakdown of enamel in both deciduous and permanent dentitions. 2. Partial or complete obliteration of the pulp chambers and pulp canals, and small teeth buds of permanent premolar were observed on radiographs. 3. Family history revealed the complete denture due to premature loss of permanent teeth in several rlatives. 4. Restorations of anterior teeth with composite resin veneering showed good esthetic result. But brokendown easily due to loss of dentinal support. 5. Restoration of posterior teeth with preformed crown rehabilitated the masticatory function and estabilished the vertical dimension of occlusion. But further care is needed for estabilishment of final vertical dimension of occlusion after completion of the permanent dentition.
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