수종의 고정성 보정장치에 따른 유성견의 치주조직 반응

조명훈,윤영주,김광원 대한치과교정학회 2001 대한치과교정학회지 Vol.31 No.1

교정력을 가한 후 각기 다른 재료로 제작된 고정성 보정장치를 적용한 경우에 발생하는 치주조직의 재형성과 치유과정을 조직학적으로 관찰하기 위해 건강한 치주상태를 가진 네 마리의 유성견을 대상으로 최초 교정력이 200gm이 되도록 견인 스프링 (sentalloy closed coil springR, Tomy Co., Japan)을 대상 치아에 결찰하여 1주일 간 교정력을 가한 후, 각각의 실험동물에 3가닥 호선인 0.018인치 DentaflexR(Dentarum Co., Germany), 3가닥 호선인 0.020인치 DentaflexR(Dentarum Co., Germany), 6가닥 호선인 0.0195인치 RespondR(G&H Co., U.S.A.)를, 그리고 자가중합형 레진 접착제인 Superbond C&BR를 고정성 보정장치의 재료를 이용하여 보정장치를 접착한 군과 보정장치를 접착하지 않은 군으로 나누어 3주간 적용 후 희생하여 H-E염색군, M-T염색군으로 나누어 광학현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1.0.0195인치 RespondR를 접착시킨 군은 0.018인치 DentaflexR, 0.020인치 DentaflexR, Superbond C&BR를 접착시킨 군에 비교할 때 압박측에서의 거대세포 침윤 감소와 긴장측에서의 신생골 형성 증가가 매우 두드러지게 나타났으며 치주인대는 형태와 배열에서 대부분 정상적인 소견을 보였다. 2.실험 1군의 모든 실험대상에서 압박측 치조골 내부의 괴사골이 관찰되었고, 압박측과 긴장측 모두에서 치조골 표면의 골양조직 및 sharped 섬유의 형성과 치주인대의 재형성 현상이 나타나는 것이 관찰되었다. 3.실험 2군은 실험 1군에 비교하여 압박측에서 거대세포 침윤이 현저히 감소되었고 치주인대는 거의 정상적인 소견을 보였다. 긴장측에서는 수층의 골침착을 보이며 치주인대 측으로 골양조직과 골아세포가 구상으로 나타나는 활성화 소견을 보였다. 이상의 결과에서 더 여러 가닥이 꼬인 6가닥 호선인 0.0195인치 RespondR(G&H Co., U.S.A.)를 보정장치로 적용한 경우가 다른 재료의 고정성 보정장치보다 더 활발한 신생골주 형성의 활성화 소견이 관찰되었으며 대조군과 유사한 배열과 형태를 보이는 정상적인 치주인대 섬유의 배열양상이 관찰되어 다른 재료들에 비교하여 치주조직의 초기 재형성과정을 더 신속하게 유도하는 것으로 사료된다. The purpose of this study was to evaluate the material for fixed type retainer, allowing physiologic tooth movement. and proper remodeling of periodontal tissue during retention period. The present study was performed to observe the histologic changes of periodontal tissue after application of different types of fixed type retainer after orthodontic tooth movement in young adult dogs. For this study, 4 young adult dogs were used as a experimental animal and experimental group was divided into three groups ; experimental group 1 contained right side maxillary third incisors and canines, experimental group 2 contained contralateral teeth of same animals, and control group contained mandibular premolars. And each dogs were applied the 4 different types of fixed type retainer to experimental group 1. The experimental teeth were ligated on the Sentalloy closed coil springR(Tomy Co., Japan) from maxillary third incisors and canines and applied orthodontic force at initial 200gm-forced during 1 week. All the experimental animals were sacrificed on the 3rd week after the orthodontic teeth movement and then the specimens were taken, fixed in formalin, embeded in parafin, sectioned 6-8μm in thickness and stained with Hematoxylin-Eosin staining, and Masson's trichrome staining method. Examined under the light microscopy. The following results were observed. There were observed that decreased infiltration of giant cells in pressure side and increased the new bone forming in tension side on the specimen of 6-stranded 0.0195' RespondR(G&H Co., U.S.A.) group. Periodontal ligament fibers were much compressed or elongated in 3-stranded 0.018', 0.020' DentaflexR(Dentarum Co., Germany), and Superbond C&BR(Sun Medical Co., Japan) groups. 2. In experimental group 1, necrotic bone inside the alveolar bone of pressure side, forming of the sharpey's fiber in osteoid tissue, and remodeling of the periodontal ligament were observed in all animals. 3. In experimental group 2, it was observed that the amount of bone resorption was equal or decreased in pressure side, and increased new bone forming and significantly decreased Infiltration of giant cell than the experimental group 1. By this results, it considered that 6-stranded RespondR(G&H Co., U.S.A.) wire was the most useful material allowing early periodontal tissue remodeling.

咬合의 安定性과 咬合音에 關한 硏究

曺光憲,尹昌根 慶北大學校 齒科大學 1984 慶北齒大論文集 Vol.1 No.1

The purpose of this study was to investigate about the relationship between the tapping sound and occlusal contacts in centric occlusion and apply its results to clinical parameter as a diagnostic aid. Forty-seven subjects, 20 to 25 years of age, without symptoms of stomatognathic dysfunction were selected from dental students in Chosun University for this study. The tapping sound in centric occlusion were recorded as bone conduction sounds using a gnathosonic instrument (Dental Sound Checker TME-202C,Yoshida Co.,Japan) and the average duration of the right and left sound was measured. With these records, the subjects were classified in three groups as Class I (with stable contacts), ClassⅡ (with mixed contacts) and Class Ⅲ (with unstable contacts). Occlusal stability was evaluated by the nature of centric occlusal contacts. The centric occlusal contacts were marked and surveyed on the upper and lower occlusal surfaces of the stone models which were mounted on Hanau model H articulator by the interocclusal records using rubber base impression material. Finally, the relationship between the occlusal pattern and nature of centric occlusal contacts was observed. The results of this study were as follows: 1. In the 47 subjects, 16 were Class Ⅰ,15 were Class Ⅱ and 16 were Class Ⅲ ,and their average durations were 8.50 msec., 9.77 msec. and 13.68 msec. respectively. 2. The average numbers of teeth with both mesiodistal and buccolingual coupled contact were 5.64 and those of occlusal contact points in C.O. were 57.81. The ratio of the surface contact over 1mm in diameter to the total contact point was 44.54% in Class I group. 3. The average numbers of teeth with coupled contact were 5.53 and those of contact points were 57.33. The ratio of the surface contact over 1mm in diameter to the total contact point was 52.67% in Class Ⅱ group. 4. The average numbers of teeth with coupled contact were 3.75 and those of contact point were 47.63. The ratio of the contact points over 1mm in diameter to the total contact points was 54.33% in Class Ⅲ group.

齒科材料用 금-은-팔라듐合金의 硬化特性

曺光憲,李基大 慶北大學校 1983 論文集 Vol.36 No.-

It has been known that noble metal alloys are one of the most important materials for dental use. In particular, silver base alloys containing copper are most widely used because of their age-hardenability. But their ageing process has not been fully understood. In the present work, the electrical resistivity and hardness change during ageing of dental silver alloys were measured and the ageing process was discussed. Principal results were as follows; (1) The standard compositions of the silver alloys were (50-55wt%) Ag+(28-20wt%) Pd+(10wt%)Cu+(5-12wt%)Au (2) The ageing treatment at 350 to 450℃ for 10 to 60 min should be the optimum condition for age-hardening treatment of these alloys. (3) The electrical resistivity showed a characteristic peak in the early stage of isochronal ageing. This peak will probably correspond to clustering of certain solute atom. (4) The isothermal ageing curves of A, B alloys were like each other in shape. The apparent activation energy for the precipitation process were calculated to be about 39 and 36Kcal/mol, respectively.

手動리머와 電動리머의 根管形成效果

金省敎,曺圭澄,曺光憲 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1

This experimental study was made to exaluate the efficacy of root canal preparation of engine reamer versus hand reamer. Eighty extracted human teeth were prepared with the following treatments and devided into 4 groups; Group 1:Canal preparation with hand reamer, and irrigation with normal saline solution. Group 2:Canal preparation with engine reamer, and irrigation with normal saline solution. Group 3:Canal preparation with hand reamer, and irrigation with 3% hydrogen peroxide and 3.5% sodium hypochlorite solution. Group 4:Canal preparation with engine reamer, and irrigation with 3% hydrogen peroxide and 3.5% Sodium hypochlorite solution. After decalcification, 5μ sections at levels 1-, 3-, and 5-mm from the apex were evaluated microscopically. The results were as follows; The effectiveness of hand reamer and engine reamer were equal in perparing the root canal at all levels from the apex, and were equal in normal saline solution groups, and 3% H_2O_2 and 3.5% NaOCl solution groups. Both in hand reaming groups and in engine reaming groups, some canal walls had still untouched portion, and canal irregularities and debris were still remained.

전부주조금관 치경부 변연의 형태가 치경부 변연 적합에 미치는 영향

김순영,조광헌 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.8 No.1

The purpose of the study was to correlate margin design(chamfer, shoulder, shoulder with a 45℃ bevel) with the seating and sealing of cemented full cast crowns under standardized simulated clinical conditions. Wax patterns were mode with milled stainless-steel dies and rings, and were invested, burnt out, and cast, The full cast crowns were cemented on individual resin dies, and a gradually diminishing load(45㎏ to 25㎏) was applied over a 10-munite period. The specimens were sectioned centrally with a low speed saw and examined with a light microscope. The results were as follows: 1. Chamfer preparations demonstrated it was the best marginal seal, followed in order by the shoulder with a 45° bevel, and by the shoulder(p<.05). 2. Chamfer preparations demonstrated it was the best occlusal seating, followed in order by the shoulder, and by the shoulder with a 45° bevel(p<.05). J. Kyungpook Nat. Univ. Sch. Dent. Vol.8, No.1, 63∼73, 1991.

인레이, 온레이, 3/4금관 및 전부주조관 수복 후 하중을 가할 시 치아내부에 발생하는 응력의 광탄성학적 비교분석

정동곤,조광헌 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.7 No.1

The purpose of this study was to evaluate the stress patterns and magnitudes in the internal part of a tooth according to the types of restoration when treated with a M. O. D. cavity preparation. In cases of the lower left 2nd premolar, four two-dimensional photoelastic models with M.O.D. onlay, 3/4crown and full veneer crown were prepared and the restorations were cemented. A vertical load of 30lbs was applied to each model on a two-point contact near the central fossa and a one-point contact on the buccal incline of the buccal cusp. Two dimmensional photoelastic stress analysis was used, and the stress areas were recorded photoelastically. The results were as follows: 1. In the case of the inlay model, the internal stress distributions were the highest especially on the linguopupal line angle. Thus the possibility of fracture on the lingual cusp is the highest among the four models. 2. Comparing the onlay and 3/4 crown, both showed similar stress patterns. However, maximum compressive stress on the linguopulpal line angle and lingual pulpal horn went in the same direction on onlay: therefore, the 3/4 crown was considered better. 3. One the full veneer crown stress distribution showed evenly. It showed the best stress distribution.

數種 Ear face-bow의 正確性

손지영,曺光憲 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1

The purpose of this study was to compare the accuracy of three different types of earface-bows with a true hinge axis and with five conventional arbitrary axis methods. Fifty subjects, 21 to 29 years of age, with clinically normal temporomandibular joint were selected from dental students and dental hygienic students for this study. And all of the subjects were trained to terminal hige axis and hinge movement. A 3㎝ square piece of millimeter graph paper was attatched to the skin in the region anterior to the tragus of the ear. Since the integument in the area was readily movable and influenced by the position of the head rest, all subjects were positioned erect in the chair with no head rest support while true hinge axis point and eight arbitrary axis points were marked on graph paper. The results of this study have been summarized as follows: Ninty-five percent of the method using the Twirl-Bow were within 5mm of the points of the kinematic axis, and the mean distance rrom the kinematic axis was 2.71±1.49mm. Eighty-two percent of the method using Quick Mount Face-Bow were within 5mm of the points of the kinematic axis, and the mean distance from the kinematic axis was 3.29±1.76mm. Eight hty-one percent of the method using the Slidematic Facebow were within 5mm of the points of the kinematic axis, and the mean distance from the kinematic axis was 3.30±2.22mm. Eighty-eight percent of Bergstrom's points were within 5mm of the points of the kinematic axis, and the mean distance from the kinematic axis was 3.15±1.43mm. Eighty-seven percent of Gisi's points were within 5mm of the points of the kinematic axis, and the mean distance from the kinematic axis was 3.23±1.54mm. Eighty-two percent of Beyron's points were within 5mm of the points of the kinematic axis, and the mean distance from the kinematic axis was 3.72±1.68mm. Fifty-one percent of Simpson's points were within 5mm of the points of the kinematic axis, and the mean distance from the kinematic axis was 5.01±2.02mm. Forty-two percent of Teteruck and Lundeen's points were within 5mm of the points of the kinematic axi is and the mean distance from the kinematic axis was 5.37±1.74mm. The acceptable degree of accuracy in hinge axis location by kinematic means is 1mm but in all methods of this study, less than 15 percent of the selected arbitrary point were within a 1mm radius from the terminal hinge axis point.

근관치료를 받은 소구치에서의 post 및 core수복 후 잔존치질량이 파절저항에 미치는 영향

김양교,조광헌 慶北大學校 齒科大學 1991 慶北齒大論文集 Vol.8 No.2

The purpose of this was to evaluate the ferrule effect of endodontically treated permolars as affected by various amounts of tooth structure. Forty recently extracted, intact premolars were used. The teeth were divided into four groups of ten each. In Group I, the coronal portions of the teeth were removed at the cemento-enamel junction. In Group Ⅱ, the coronal portions of the teeth were removed to 1mm above the cemento-enamel junction. In Group Ⅲ, the coronal portions of the teeth were removed to 2mm above the cemento-enamel junction. In Group Ⅳ, the coronal portions of the teeth were removed to 3mm above the cemento-enamel junction. Every tooth was endodontically treated and a prefabricated paralleled Para-post was inserted in each canal and a composite resin core was built to 7mm above the cemento-enamel Junction. Thereafter, a complete cast crown was made from nickel-chrome alloy and cemented with zinc phophate cement to each tooth. The failure loads of the specimens were measured by an Instron Universal testing machine. The mean values of failure loads for the four groups were statistically compared by studen't t-test. The results were as follows: 1. There was a statistically significant difference between the failure loads of Group I (removed at the cemento-enamel junction) and the others(p<0.05). 2. The mean values of the failure loads of the Group Ⅱ (removed to 1mm above the cementoenamel junction), Group Ⅲ (removed to 2mm above the cemento-enamel junction) and Group Ⅳ(removed to 3㎜ above the cemento-enamel junction) exhibited values the same order as Group Ⅳ (removed to 3mm above the cemento-enamel junction), Group Ⅱ (removed to 1mm above the cemento-enamel junction), Group Ⅲ (removed to 2mm above the cemento-enamel junction) but there was no statistically significant difference among them(p>0.05).

이중외피 파사드의 운전모델 개발에 관한 연구

박유영,조재훈,여명석,김광우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The objective of this study is to develop the operation model of the double-skin facade for energy conservation and user comfort. This study proposes development process of the operation model in three steps. A case study is used to investigate the feasibility of the process. The G building in Kungkido is chosen. The main contents of this study are as follows. 1) The operation objectives and standards are established. And the operation factors classified according to the objectives and standards. 2) Correlation of the operation factors are clarified. And Individual models. The operation model is essential to building which has the double-skin facade and logical operation would be improved by this model. For the practical application of this operation model, it will be needed to connect the building management system.

Finite Element Analysis of Stress Distribution with Load Transfer Characteristics of the Implant/bone Interface

이종우,이청희,조광헌 대한치과이식학회 2003 대한치과이식학회지 Vol.22 No.1