레이저의 齒科保存 治療에의 應用

李正석(Chung Suck Lee),李贊榮(Chan Young Lee),金態(Ung Kim),崔盛根(Sung Keun Choi) 대한치과의사협회 1985 대한치과의사협회지 Vol.23 No.10

CO<SUB>2</SUB>레이저 조사에 따른 치아경조직 변화에 관한 편광현미경적 연구

이정석(Chung Suck Lee),李漢龍(Han Ryong Lee) 대한치과의사협회 1986 대한치과의사협회지 Vol.24 No.2

CO₂레이저 조사후 상아질 조직변화에 대한 주사전자혐기경적 연구

최동훈,이정석,Choi, Dong-Hun,Lee, Chung-Suck 대한치과보존학회 1991 Restorative Dentistry & Endodontics Vol.16 No.1

The main purpose of this study was to investigate the possibility of obstruction of dentinal tubules through irradiation of the $CO_2$ laser on the dentin surface. For this study, 104 extracted caries - free premolars and molars were grinded their mesial or distal surface to expose dentin completly. And these specimens were divided into three Groups. Group I : those with their smear layer not removed and Group IT : those with their smear layer removed, were irradiated by the $CO_2$ laser(SPACE LASER - $CO_2$ VEGA 25) at five different energy levels ranging 4 - 20J/$cm^2$, and all specimens were observed with scanning eletron microscope (Hitachi S - 450). Group m was divided into 2 sub - groups: one with smear layer, another one without and those were irradiated with $CO_2$ laser of the same condition as Group I & II. All specimens were immersed in, $37^{\circ}C$, 0.5% methylene blue solution for 48 hours after 100 times of thermocycling at $4^{\circ}C$ and $60^{\circ}C$, and were observed with stereo -light microscope (Olympus SZH - ILLD) to evaluate dye penetration. The following results were obtained; 1. The dentinal tubules were obstructed through laser irradiation. 2. The dentinal tubules were still obstructed after treatment of 10% HCl/2sec., then it was proved that acid resistance of detin surface was also increased. 3. The Group of laser irradiation showed less dye penetration than control Group. 4. The smear layer hardly affected obstruction of the dentinal tubules through laser irradiation.

CO₂레이저 조사가 치아경조직에 미치는 영향에 관한 EPMA분석 및 주사전자현미경적 연구

장계봉,이정석,이찬영,이승종,Chang, Gye-Bong,Lee, Chung-Suck,Lee, Chan-Young,Lee, Seung-Jong 대한치과보존학회 1986 Restorative Dentistry & Endodontics Vol.12 No.1

The purpose of this study is to obtain the data of prestep in cavity preparation by observing changed conditions of laser irradiated dental hard tissues. The forty five extracted caries free human molars were divided into three groups and each group into five subgroups. A $CO_2$ laser irradiation was performed each subgroup of group I for one second with output power of 5 W, 10 Wand 20 W. On group II, laser irradiation was done ten times for 0.1 second duration using same power ratings as group I. On group III, laser irradiation was done 0.1 second, 0.2 second and 0.4 second with output power of 50 W. We investigated mineral contents and crater wall of obtained specimens, i.e., laser irradiated teeth, using computer controlled electron probe microanalyzer and scanning electron microscope. The following results were obtained: 1. Both calcium and phosphorus contents in laser irradiated enamel crater wall were increased, and magnesium content was decreased, but these trends were not statistically significant. 2. In laser irradiated dentin, change of mineral content was more significant. 3. In laser irradiated enamel and dentin, there were no significant differences on mineral content change due to irradiation condition and energy density. 4. In scanning electron microscopic study, enamel rods of the crater wall were fused and clefts were observed in parallel with the direction of enamel rod for all groups. 5. In laser irradiated dentin, irregular fusion and clefts were observed. In irradiated teeth with high power and short duration, the locally formed narrow crater wall was observed.

Tea bag 포장한 멸치 복합 분말의 가공 및 그 추출물의 정미성분

이호연(Ho Yeon Lee),정부길(Bu Gil Chung),이정석(Jung Suck Lee),김풍호(Poong Ho Kim),김진수(Jin Soo Kim),이응호(Eung Ho Lee) 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.4

This study was carried out to prepare anchovy based powder for instant soup packed in tea bag which can be used handily as a extractives, and to determine the taste compounds of extractives of anchovy based powder for instant soup. The anchovy based powder for instant soup was made by adding of 72% in the redried anchovy, 14% in the sea tangle, 7% in the mushroom and 7% in the katsuobushi to the total mixtures. And the anchovy based powder for instant soup was packed in tea bag. The desirable extraction time are 5 min in package in tea bag with air permeability 100 ㎥/㎡/min and over 20 min in package in tea bag with air permeability 65 ㎥/㎡/min, respectively. Judging from the result of extraction rate of total nitrogen, color and sensory evaluation in extractives of anchovy based powder for instant soup extracted by optimal extraction time, the quality in extractives of instant soup packed in tea bag with air permeability 100 ㎥/㎡/min was superior to those of instant soup unpacked in tea bag and of instant soup packed in tea bag of air permeability 65 ㎥/㎡/min. The principal taste compounds of extractives of anchovy based powder for instant soup packed in tea bag with air permeability 100 ㎥/㎡/min were IMP (9.26 ㎎/100 ㎖ in 5% solution) and free amino acids (24.30 ㎎/100 ㎖ in 5% solution) such as histidine, proline, lysine and taurine. Total creatinine, betaine and TMAO were seemed to act an auxiliary role in taste of extractives of anchovy based powder for instant soup packed in tea bag with air permeability 100 ㎥/㎡/min.

CO₂레이저 조사에 따른 치수강내 온도변화에 관한 실험적 연구

이종만,박동수,이찬영,이정석,Lee, Jong-Man,Park, Dong-Soo,Lee, Chang-Young,Lee, Chung-Suck 대한치과보존학회 1984 Restorative Dentistry & Endodontics Vol.10 No.1

The purpose of this study was to suggest the use of laser energy in the the field of operative dentistry without considerable pulpal damage and significant effects on the dental hard tissue, additionally to find out the methods which could control the temperature rise. The laser beam (CW $CO_2$ laser, output: 6W, beam diameter: 1.5mm) was focused on the center of the occlusal surface of extracted lower molars. A Ge lens (focal length 200mm) was used to focus the primary laser beam. In order to vary the total amount of the same irradiated energy, experimental subjects were devided into three groups: continuously irradiated group, intermittently irradiated group, and water-cooled group after continuous laser irradiation. Temperature changes in the pulp chamber after laser irradiation were measured and recorded by the digital thermometer and recorder. The following results were obtained: 1. Temperatures in the pulp chamber were raised up in the order of the continuously irradiated group, intermittently irradiated group, water-cooled group after continuous laser irradiation. 2. In the continuously irradiated group, the temperature was raised up $1.7^{\circ}C$, $3.8^{\circ}C$, $7.3^{\circ}C$, $17.2^{\circ}C$ after 2, 4, 8, 16 seconds of the irradiation of laser. In the intermittently irradiated group, the changes were $1.2^{\circ}C$, $3.4^{\circ}C$, $6.3^{\circ}C$, $11.1^{\circ}C$, respectively. In the water-cooled group after continuous laser irradiation, the changes were $0.0^{\circ}C$, $0.8^{\circ}C$, $1.6^{\circ}C$, $6.9^{\circ}C$, respectively. 3. The starting time of temperature rise in the pulp chamber had no connection with laser irradiation time.

CO₂ laser조사가 성견치수에 미치는 영향에 관한 실험적 연구

김희중,이찬영,이승종,이정석,Kim, Hee-Joong,Lee, Chan-Young,Lee, Sung-Jong,Lee, Chung-Suck 대한치과보존학회 1988 Restorative Dentistry & Endodontics Vol.13 No.1

The object of this paper was to investigate the histopatological changes on dog's pulp under cavitation by irradiation of the $CO_2$ laser. The subjects were derived from four dogs, and irradiated 113.23 J/$mm^2$, 283.09 J/$mm^2$, 566.08 J/$mm^2$ in Group I, II, and III respectively. The dogs were sacrificed immediately, 24 hour, 72 hour and 1 week after $CO_2$ laser treatment. For light microscopic examination, routine H-E and PAS stains were employed. For electron microscopic observation, the teeth were fixed in 1% paraformaldehyde and 1% glutaraldehyde, decalcified teeth in 10% EDTA were stained by uranyl acetate and lead citrate. The observation was made with a Hitachi H-500 model electron microscope. The following results were obtained in this study: 1. At the early stage of the experimental sub-groups-immediately, 24 hour, 72 hour samples of Group I, II and III-coagulation necrosis and hyperemia were observed in odontoblastic and subodontoblastic pulpal layer. 2. At the 1 week sub-group of Group I, II, regenerative hyperplasia of the odontoblasts without coagulation necrosis were revealed, in addition to thickened predentin. On he other hand coagulation necrosis and atrophic change accompanying with hyperplasia were found at the 1 week sub-group of Group III. 3. Ultrastructurally, the odontoblasts appeared nuclear degeneration, vacuolar change of cytoplasmic organelles and rupture of plasma membrane at the early stage of the experimental period of all groups. 4. Under spectrohelioscopic examination, regenerative odontobalsts were seen at the 1 week specimens of Group I, II and III. 5. The pulpal response occured at 113-566 J/$mm^2$. The pathologic change of pulp tissue occured at the early experimental period but regeneration of odontoblasts could be seen after 1 week.

수종의 접착성 레진 이장재의 미세변연누출에 관한 전자현미경적 연구

금기연(kee Yeon Kum),이찬영(Chang Young Lee),박동수(Dong Soo Park),이정석(Chung suck Lee),이승종(Seung jong Lee) 대한치과의사협회 1994 대한치과의사협회지 Vol.32 No.9

女大生의 齒牙喪失과 回復에 關한 調査

이정석 梨花女子大學校 韓國生活科學硏究院 1970 韓國生活科學硏究院 論叢 Vol.5 No.-

This project is proposed to measure the dental needs of Korean college girls and to calculate their dental needs as a part of a follow up study of student dental health control program.Prevalence of dental caries,DMF teeth,DMF index,and the related informations were presented in Vol.3 of this journal,previously,in 1969. Among 5,354 students,number of students who hed experienced in teeth extraction were 1,995,and their missing data were calssified into three categories; those were, 1. "required cases"(missings and required prosthetic works including required reconstruction works which needed to recover their lost functions), 2. "replaced cases"(missings but permanently replaced with prosthodontic works such as fixed or removable bridges and partial dentures), and 3. "no needed cases"(missings, but no prosthetic works required,in cases of orthodontic treatment, or third molars,or no spaces due to early loss of permanent teeth, etc.) 1) 37.25% of the students,1,995 among 5,354, hed experiened in one or more teeth extractions. 2) Analyzing the subject by the number of missing teeth,50.62% of them had one missing tooth,30.48% had two missing teeth,9.87% had three,and 5.31% had four missing teeth.Five or more took 3.72%.The poorest one had eleven missing teeth. 3) Average missing teeth per student had increased according to age; from 18 to 22,those were 0.55,0.63,0.70,0.72,and 0.77.Average number of missing teeth of this subject were 0.69±1.22.It included 5.26% of root fragments. 4) THE "required cases"in this study,43.79% of the missing teeth did not replaced.Actual required cases which excluded no needed cases,had shown as 58.03%. In short,required cases were predominated approximately to replaced cases. The ratio was 3:2. 5) The "replaced cases"were stayed in 31.67%. Actual replaced cases hold 41.97%. 6) The "no needed cases"were formed nearly a quarter(24.54%).Excluding the third molars,it would be 20.55%. 7) The orders of individual teeth of the required cases and the replaced cases were different each other except the lower first molars which kept the first place. 8) Compared with upper and lower jaws: in the missing teeth, the ratio was 33.99 : 66.02 (appoxmately 1:2); in the required cases,the ratio was 26.25 : 73.75 (appoxmately 1:3); in the replaced cases,the ratio was 35.70 : 64.30 (appoxmately 1:2). In a word,lower figure of required cases of uppres was due to high rate of replacement of upper anteriors. 9) The replaced rate of molars which were responsible in mastication was comparatively low while anteniors showed high rate.Those were,27.57% for upper first molars,5.00% for upper second molars,42.10% for lower first molars.and10.86% for lower second molars.And,for anterors,87.07% for upper central incisors,78.91%of upper lateral incisors and 71.87%of lower central incisors. 10) Increasing the age,the replaced rate of uppers had shown increased while its of lowers had reduced. 11) To compare the rights and the lefts in each case,there were no sighificant differences even the lefts were little predominant.

放射線照射가 白鼠齒髓 및 齒根端周圍組織에 미치는 影響에 關한 實驗的 硏究

이정석,朴東洙,李贊榮 대한치과의사학회 2001 대한치과의사학회지 Vol.20 No.8