백서구치의 실험적 치아이동후 처수조직 변화에 관한 조직학적 연구

진근호(Keun Ho, Jin),홍성준(Sung Joon, Hong) 대한치과교정학회 1991 대한치과교정학회지 Vol.21 No.3

미세 입자 제거를 위한 양전하가 부가된 수처리 필터 제조 및 성능평가

진근호(Geun-Ho Jin),신희수(Hee-Soo Shin),정성학(Sung-Hak Jung),이재근(Jae-Keun Lee),박성은(Sung-Eun Park),박정수(Jung-Su Park),최성규(Sung-Kyu Choy) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5

The purpose of this study is to modify the surface charge of filter media positively for capturing negatively charged pollutants such as bacteria and virus from water. The apparatus for manufacturing of the filter media consists of a mixing tank, a vacuum pumping system, an injection nozzle, a roller press and a controller. The filter media is composed of glass fiber (50~750 ㎚), cellulose fiber (10~20 ㎛) and positive charge modifier. The performance evaluation of the charge modified filters is conducted by measuring the surface zeta potential and the filtration efficiency. The zeta potential value and the filtration efficiency of the charge modified filter media are +35 ㎷ at pH 7 and 98% for PSL particles for 0.11 ㎛, respectively.

다단 원통형 디스크 프레스를 이용한 슬러지 탈수 장치에 관한 연구

정성학(Sung-Hak Jung),신희수(Hee-Soo Shin),진근호(Geun-Ho Jin),이재근(Jae-Keun Lee),박복성(Bog-Sung Bark),이한욱(Han-Wook Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5

The multi-disk press system is developed and evaluated to enhance the performance of the conventional screw press in sludge dewatering process. The objective of this study is to investigate experimentally the pre-treatment technique for the multi-disk press of dewatering system. In this study, the variations of the chemical coagulation are compared in the pre-treatment process, and the water content of sludge is evaluated in the multi-disk press. The particle size of sludge and the height of sedimentation liquid are measured to estimate sludge coagulation. The experimental results show that the particle size of sludge is increased and the sedimentation liquid is separated by the chemical coagulation in the sewage sludge The multi-disk press of dewatering system can reduced to the water content of the sewage sludge to 79.95 wt%.

가정용 고분자 전해질 연료전지 열병합 발전시스템의 급탕 적용을 위한 온수 저장조의 최적 설계에 관한 실험적 연구

황유진(Yujin Hwang),안영철(Young-Chull Ahn),정성일(Seong-ir Cheong),진근호(Keun-ho Jin),이재근(Jae-keun Lee) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.6

There are many attempts to use a fuel cell system as a residential power generation system. The purpose of this study is to investigate the optimal design of a water tank for a hot water system when the fuel cell co-generation system is combined with a domestic hot water supply system. The demands of hot water supply per month per home are investigated in Busan for a year. It showed somewhat large differences between the actual demand and the designed demand of hot water, but the actual capacity of hourly averaged hot water demands is analyzed as 60 ℓ/h in this study based on the actual demand. The experiments are performed in the various inlet and outlet locations of nozzles, and the hot water consumption rates. The experimental results are showed that the optimal capacity of the water tank is 200 f when the thermal efficiency, the storing capacity of hot water and the space for installation are considered.

악안면 형태학적 특성을 고려한 유치열기 반대교합의 치료

진근호 대한치과교정학회 1993 대한치과교정학회지 Vol.23 No.1

Anterior crossbite is a common malocclusion in the early deciduous dentition. Even today, many these malocclusion patients are not treated until the mixed or permanent dentition. And the purpose here is to emphasize the need for early diagnosis and possible treatment for these anterior crossbite malocclusions and their associated facial patterns. Case histories of 4 patients selected from the author's practice are presented. Different methods of treatment are evaluated. Some improvement was achieved in all patients from an early interceptive regimen, although ultimately corrective orthodontic treatment may still be needed in some. It is concluded that early interception of deciduous anterior crossbite malocclusion should by attempted in patients; there should be no delemma in reaching such a decision. And it is essential for diagnosis and treatment to determine exact variations in growth when some appliance are used, it is recommended that growth-related records be made as early as possible.

난소적출 백서에서 estrogen투여가 실험적 치아이동에 미치는 영향

김오환,박병건,김정기,진근호 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.4

난소를 적출한 백서에서 실험적 치아이동 동안 치주와 치조골 조직의 반응에 대한 에스트로젠의 효과를 알아보기 위하여 체중 250gm 내외의 성숙한 백서 80마리를 난소척출한(ON)군과 난소적출하고 에스트로젠을 투여한 (OE)군, sham operation만 시행한(NN)군, sham operation을 시행하고 에스트로젠을 투여한 (NE)군으로 각각 분류하여 교정력을 가하였다. OE군과 ON군은 교정력을 가하기 3주전에 난소를 적출하여 에스트로젠 결핍성 골다공증을 유발시켰다. OE군과 NE군에서는 2일에 한번씩 에스트로젠을 50㎍/kg BW씩 복강내에 주사하였다. 치근의 압박측과 인장측의 Howship's lacuna와 파골세포수를 비교 분석하였고, 치아 이동량을 계측 분석하였으며 그 결과는 다음과 같다. 1. 교정력을 가하기 전 NN군에서 보다 ON군에서 치조골 부위에 더 많은 Howship's lacuna와 파골세포가 관찰되었다. 2. 교정력을 가한 후 1일에서 15일까지 압박측의 lacuna와 파골세포의 증가양상은 NN군에서 보다 ON군에서 더 컸으며, ON군의 lacuna수는 OE군보다 교정력을 가하는 전기간동안 높은 수치를 나타냈다. 3. 인장측의 파골세포수는 ON군에서 3일까지 급격히 증가하고 이후 감소하였으나, 전기간 동안 NN군에 비해 높은 수치를 나타냈다. 4. 치아이동 속도는 NN군, OE군, NE군에서 비슷하였고, ON군에서 7일에서 11사이에 다른 군에 비해 뚜렷한 증가를 보였다. 5. 교정력 제거 후 7일간 재발을 관찰한 결과 처음 12시간이 가장 큰 재발 이동량을 나타냈으며, 모든 군에서 유사한 양의 재발을 보였다. The purpose of this study was to evaluate the effect of estrogen on the periodontium and alveolar bone tissue response during experimental tooth movement in ovariectomized rats. Eighty female rats, 250gm in body weight, were classified into four groups; sham operated group(NN), ovariectomized before 3 weeks to begin the experiment, which resulted in estrogen-deficient osteoporosis. In OE group & NE group, estrogen was injected 50㎍/kg BW. every other days. The left maxillary 1st molar was moved mesially with 60g force. Each four rats were sacrificed after 1,3,5,15 days from application of orthodontic appliance and after additional 7days from removal of orthodontic appliance. Histological findings on mesial roots of upper 1st molar in pressure and tension side are observed. The results were summarized as follows; 1. In pressure side of alveolar bone, the number of osteoclasts and Howship's lacuna of ON group was significantly more than that of NN group from 1 day to 15 days(p<0.05). Especially the number of Howship's lacuna of ON group was significantly more than that of OE group during all experimental period(p<0.05) 2. In tension side of alveolar bone, the number of osteoclasts of ON group was significantly increased from 1 day to 3 days and decreased after 7 days. But the number of osteoclast of ON group was significantly more than that of NN group during all experimental period(p<0.05). Also the number of Howship's lacuna of all groups was abruptly increased at 1 day, but slowly decreased till experimental 15 days. And the number of Howship's lacuna of ON group was significantly more than that of NN group from O hr to 7 days(p<0.05) 3. The speed of tooth movement of OE group & NE group was similar to that of NN group(p>0.05). The amount of tooth movement of ON group between 7 days and 15 days was significantly greater than those of other groups(p>0.05). 4. The degree of relapse of ON group after 7 days from removal of orthodontic appliance was similar to those of other groups(p>0.05).

상악 악교정 수술에 따른 비순부의 비심미적 변화와 대책

진근호 의치학사 1993 치과임상 Vol.13 No.7

Total maxillary os tbpugs among the most O montyr performed orthognathic surgical procedures for the correction of many dentofacial defbimihes But, Itsprocedures can results in potentially anesthetic changes in the nasolabial region, including widening of the afar bases, upturning of the nasal tip, flattening and'thining of the upper lip, and downturning of the commissures of the mouth. These postoperative changes,in nasolabial morphology are secondary to alterations in the regional anatomy following skeletal repositioning, cartilagenous resection, irim ular retraction This article presents' a series: of cases with unfavorable nasolabial changes following maxillary surgery. Consequently, the orthodontist and surgeon must perform a through functional and esthetic nasolabial examination along with their usual sugical-orthodontic evaluation Adjunctive nasolabial procedures are based on a through esthetic evaluation followed by a diagnosis and comprehensive treatment plan.

한국인 정상교합자의 치관경사도에 관한 임상통계학적 연구

김종성,홍성준,진근호 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.3

The objective of this study was to evaluate some clinical aspect of the crown inclination in Korean's naturally occuring optimal occlusion, and to statistically compare the crown inclination at Andrews' FA points group and another bracket slot level group based on marginal ridges. The materials consisted of study models of 30 patients (14; Korean's males, 16;Korean's females) who have nonorthodontic normal occlusion. The results were as follows ; 1. Mean, standard deviation, range of clinical inclination in the Andrews' FA points and another bracket slot level were obtained. 2. Statistically difference between Andrews' FA points group and bracket slot level group based on marginal ridge was non significant(p > 0.05). But standard deviation and range in FA points group was more stability than marginal ridge group. 3. A lingual crown inclination at FA points in the upper posterior teeth existed(canines through molars). 4. The lingual crown inclination at FA points in the lower dentition progressively increased from the incisors through the second molars.

백서구치의 실험적 치아이동 후 치수조직 변화에 관한 조직학적 연구

진근호,홍성준 全北大學校 齒醫學硏究所 1990 전북치대논문집 Vol.8 No.1

It was the aim of this investigation to evaluate some histologic aspect of rat pulp tissue after it had been compromised by an experimental orthodontic force. Experimental animals of thirty five Spraque-Dawley rats were employed. The first upper molars had been successively mesial moved(initial load 100 gr.) with a closed coil spring during 21 days. The experimental periods were set on immediate, 1 day, 1 week, 2 weeks, 3 week, 4 weeks following retention time. On each experimental period, the rats were killed and prepared for the light microscopy. After prepared with H/E stain and Gomori's one-step trichrome stain, the specimens were analyzed with evaluation criteria which were adopted in this study. The result may be summarized as follows : 1. The main pulp changes due to experimental orthodontic force included vacuolization of odontoblastic layer, circulation disturbance, root resorption, reduced pulp collagenous fiber density and mean cell count of pulp fibroblast in the immediate group. 2. The pulp tissue changes were revealed reversible because the relieved pulp tissues from experimental orthodontic force were recovered rapidly in each evaluation criteria during retention periods. 3. Compared with normal control group, pulp collagenous fiber density were decreased in immediated group(p<0.01), but increased in each retention groups. These seem to suggest that the pulp tissues were aged after experimental orthodontic force conditions. 4. Compared with normal control group, mean cell counts of pulp fibroblasts were decreased in immediate group(p<0.05), but increased continuously in each retention groups. These seem to indicate that the pulp tissues were highly regenerative after experimental orthodontic force conditions. 5. Compared with normal control group, root resorptions occurred in all immediate specimens(p<0.01) and they are healed in each retention periods, but often observed in 4 weeks retention group. These seem to indicate that root resorptions were recovered slowly after experimental orthodontic force conditions.

잔유성 치조-구개파열 부위의 2차 자가골 이식에 관한 임상적 연구

진근호 의치학사 1993 치과임상 Vol.13 No.4

The aim of this study was to re-evaluate the treatment results after secondary autogenous bone grafting for reconstruction of alveolar celfts. The various indications for, and aims of the procedure, are enumerated. And, the results of secondary or late secondary bone-grafting procedures in 3 unilateral cleft lip and palate patients are reported. The conclusion are as follows : 1. Secondary closure of alveolar defects with bone grafting is generally reported to provide better results than early grafting. 2. Bone graft to the residual cleft area should be placed before eruption of the permanent canine to maximize the periodontal benefits. 3. The advangates of bone grafting are to close the persistent oro-nasal fistulas, to perovide the bony support for unerupted teeth and teeth adjacent to the cleft, to construct the continuous alveolar ridges, to stabilize the mobile premaxilla, to aid support of the afar base and nasolabial contour. 4. Autogenous bone appears to by far the best graft material.