하악과두골절의 외과적 처치 : Dr. 남씨 방법 Dr. Nams Method

민승기,이동근 원광대학교 치의학연구소 1996 圓光齒醫學 Vol.6 No.1

1993년 1월부터 1995년 12월 까지 원광대학교 치과대학 구강악안면외과에 하악과두 골절을 주소로 내원한 환자 25명에 대하여 Dr. 남씨 방법에 의한 관혈적 정복술을 시행하였다. 술후 악간 고정은 2주정도 하였으며 수동적 개구운동 및 능동적 개구 운동을 2에서 4주, 4주이상에서 시행하였다. 술후 약 3개월에서 1년반동안의 검사에서 개구량은 평균 45㎜ 이상 큰 불만없이 벌어졌으며 하악운동량도 비이환측에서 더 많은 하악운동을 보였으나 모두 정상범주를 나타내고있었다. 하악운동을 하고 있는 동안에 관절내 환자 스스로 호소할만할 동통 및 관절잡음이 발견되지 않았으나 가끔씩 이환측 및 비이환측 관절 잡음은 감지되었다. 두 증례에 있어서는 과두의 과도한 흡수를 보였다.

원광대학교 치과병원 교정과에 내원한 환자의 분포 및 변동 추이에 관한 연구

김준관,김상철 원광대학교 치의학연구소 1990 圓光齒醫學 Vol.1 No.1

1065 patients (male ; 379, female : 686)who visited at depatment of orthodontics in Wonkwang University Dental Hospital form 1983-09-05 to 1990-10-05, were surveyed and analyzed to study the distribution and the trend of malocclusion patterns. 1. The number of visiting, patients has increased, year by year. And female patients has visited more than males. 2. The percentage of the age group form 8 to 15 was 63.8 : above 20, 14.1% : under 7, 10.1%. 3. The patients lived in Iri, Kun San, lk San, Ok Gu, Kim Je, in that order of frequency. The percentage of patients in above addresses was 92.3. 4. Anterior cross bite showed the highest percentage in chief complaints. 5. Hellman dental age Ⅲ b showed the highest percentage in male : Ⅳ a, in female : Ⅳa, in total. 6. The percentage of skeletodental dysplasia was 64.9: dental dysplasia, 24.9%skeletal dysplasis, 10.1%. 7. The percentage of Class Ⅰ malocclusion was 362% : Class Ⅱ division 1, 25.0% : Class Ⅱ division 2, 2.7% class Ⅲ, 36.1%. 8. The percentage of patients, treated with preventive orthodontics, were 38.0: with comprehensive orthodontics, 62.0%, 43.5% of comprehensive orthodontics cases were extraction cases and 56.5%, non-extraction cases. And 4 first bicuspids have been extracted in the highest percentage.

처리방법에 따른 혈소판 함유 혈장의 농축도에 관한 연구

김형주 ( Hyung Ju Kim ),민승기 ( Seung Ki Min ) 원광대학교 치의학연구소 2005 圓光齒醫學 Vol.14 No.2

가토 하악과두연조직 피개가 과두골성형술시 치유과정에 미치는 영향에 관한 실험적 연구

장동호,이동근,김수남 원광대학교 치의학연구소 1990 圓光齒醫學 Vol.1 No.1

During the condylar shaving procedure, the articular soft tissue cover can be removed. Author compaired the histological healing process of the articular soft tissue cover between the preservative and unpreservative group with 45 New Zealand rabbits(average wt.: about 2.5㎏). In unpreservative group, the usual high condylar shave with the removal of soft tissue cover was performed. In the preservative group, the underlying bone, replaced in its original position and sutured. The animals were sacrified 1,2,3,4,6 weeks interval after operation. The specimens were fixed in 10% neutral formalin and decalcified, paraffin embedded and stained by Hematoxylin & Eosin, and Masson' s trichrome. The obtained results were as follows. 1. The condyles of the both group were covered with an articular soft tissue layer. 2. The cartilage cells in suharticular layer has regular continuous patterns in the preservative group but frequently interrupted in the unpreservative group. 3. The incision made in the posterior part of the articular surface for the elevation of the articular soft tissue frequently caused a deformity such as the interruption of the subarticular layer of cartilage. 4. By the above findings, the preservation of articular soft tissue cover may be the effective operation method on concept of bone remodelling.

치조골수 유래 성체줄기세포의 신경세포분화능에 관한 연구

송제봉 ( Je Bong Song ),유형근 ( Hyung Keun You ) 원광대학교 치의학연구소 2005 圓光齒醫學 Vol.14 No.1

연쇄 구균의 세포벽 단백질 추출물이 림프구 활성의 억제에 미치는 영향

상현숙,임미경 원광대학교 치의학연구소 1995 圓光齒醫學 Vol.5 No.1

The inhibitory effect of cell wall extracts of streptococci, have been investigated to know hostparasite relationship or pathogenesis of abscess formation. Streptococci isolated from the infected root canals were sonicated to get cell wall extracts which have been known as one of the major factors of pyogenesis. Lymphocytes separated by density gradient were stimulated with phytohemagglutinin and exposed to cell wall extracts of Streptococcus sanguis, S. mitis, S. uberis, S. mutans(ATCC 10449), and S. jieealis(ATCC 19433). [^3H]-thymidine uptake of lymphocytes was analyzed with scintillation counter and lactate dehydrogenase (LDH) activity was measured with autochemistry analyzer. S. fieealis had the strongest inhibitory effect, beginning at 100㎍/㎖ concentration of sonic extracts. S. sanguis and S. mitis had inhibitory effect at 300㎍/㎖, while S. uberis and S. mutans showed no inhibitory effect on DNA synthesis even at 300㎍/㎖. Each streptococci showed different inhibitory effect on the DNA synthesis of lymphocytes, of which finding indicated wide spectrum of susceptibility of lymphocytes according to streptococcus spp. There were no significant difference of LD activities between control and each streptococcal extracts. Streptococcal sonic extracts did not affect the morphological findings or number of colonies of activated lymphocytes. These finding suggested the inhibitory effect of sonic extract of streptococci to lymphocytes could be detected by DNA synthesis inhibition, not by cellular membrane damage.

상악제1소구치의 법랑질 두께에 관한 연구

이진한,기태석,오상천,동진근 원광대학교 치의학연구소 2002 圓光齒醫學 Vol.11 No.2

Enamel is the hardest tissue in the body. This property enables enamel to withstand the heavy loads of mastication and resist wear during the mastication. Tooth structures (enamel thickness, size of pulp chamber, etc) are influence to strength of restoration, esthetics, marginal adaptation. This study on the enamel thickness of maxillary first premolar may offer guidance about tooth reduction depth and decision of margin type in tooth preparation. The total sample consisted of 36 permanent maxillary premolars, all of which were from different individuals (16-18 years male and female), extracted for orthodontic treatment. The teeth were fixed in 5% formalin and stored in normal saline. Extracted teeth were embedded in methyl methacrylate block. Only one section was taken from each tooth through buccal and lingual cusp tips in a plane perpendicular to the cervical margin of the crown, and then sectioned through mesiodistal plane, included central groove. Thereafter the cut faces were polished with 800, 1200, 2000 grit SiC paper. Each tooth was photographed at a magnification(×7). Linear measures of enamel thickness were recoded for each sample. The data were analyzed by SPSS (One-Way ANOVA, Scheffe's test). Result obtained were as follows, 1. The thickness of the enamel at the lingual cusp tip was 1.92㎜, buccal cusp tip was 1.42㎜. 2. The thickness of the enamel at the occlusal surface was 1.21㎜ in buccal cusp, 1.23㎜ in lingual cusp, 0.94㎜ in mesial marginal ridge slope and 0.93㎜ in distal marginal ridge slope. 3. The thickness of the enamel at the 1㎜ above cementoenamel junction was 0.40㎜ in buccal side, 0.51㎜ in lingual side, 0.46㎜ in mesial side and 0.47㎜ in distal side. 4. The thickness of the enamel at the 2㎜ above cementoenamel junction was 0.67㎜ in buccal side, 0.82㎜ in lingual side, 0.82㎜ in mesial side and 0.93㎜ in distal side.

가토의 상악동 골이식술시 혈소판 농축 혈장(Platelet Rich Plasma)의 골형성 효과

김용윤 ( Yong Yun Kim ),오승환 ( Sung Hwan Oh ) 원광대학교 치의학연구소 2005 圓光齒醫學 Vol.14 No.2

자일리톨 함유 식품이 합성 수산화인회석에 대한 Streptococcus mutans의 부착에 미치는 영향에 관한 실험적 연구 : An in vitro study

이재춘,김대업 원광대학교 치의학연구소 2002 圓光齒醫學 Vol.11 No.2

There have been efforts that inhibit development of dental caries by sugar substitution. But, it is controversial if xylitol has anticariogenic effect in the presence of sucrose. And there are few papers dealing with the combined action of xylitol and sucrose. For the purpose of resolving this controversy, the author investigated the effect of xylitol on enamel demineralization and on adhesiveness of S. mutans to hydroxyapatite in the presence of sucrose. Five experimental solutions were prepared as follows: (S: sucrose, X: xylitol) Group 1: BHI broth Group 2: BHI + 1 % S Group 3: BHI + 0.75% S+0.25% X Group 4: BHI + 0.5% S + 0.5% X Group 5: BHI + 0.25% S + 0.75% X Group 6: BHI + 1 % X Each solution was inoculated with 100㎕ of S. mutans JC-2. And saliva coated hydroxyapatite beads were put into each experimental solution. And then each solution was incubated at 37℃ under anaerobic condition. After incubation, the adhesiveness of S. mutans on hydroxyapatite was evaluated. The Vickers hardness numbers were measured on extracted human primary teeth, and these teeth were dipped into the same experimental solution and incubated at 37℃ under anaerobic condition for 48hours. Surface microhardness were measured again after incubation. The obtained results were as follows; 1. In the presence of sucrose, xylitol can reduce the adhesiveness of S. mutans on hydroxyapatite surface from the ratio of 25% sucrose to 75% xylitol(P<0.05). 2. In the presence of sucrose, xylitol can reduced demineralization of primary teeth enamel surface from the ratio of 50% sucrose to 50% xylitol(P<0.01).

저출력레이저 조사가 백서의 좌골신경 재생에 미치는 영향에 관한 연구

권순오,한경수,엄인웅,김병욱 원광대학교 치의학연구소 1992 圓光齒醫學 Vol.2 No.1

This study was performed to investigate the effects of low-power laser (Gallium-Arsenide diode and Helium-Neon gas) application on the regeneration of experimentally cut sciatic nerve in rats. The right sciatic nerve was cut and immediately sutured by combined suture through epineurium and perineurium under microscopic field. Suture material used were 8-0 coated Vicryl (polyglactin 910) to nerve and 6-0 Mersilk to muscle and skin. The subjects were classified into control or experimental group by without or with application of laser and experimental group was subdivided by amount of application time. The subjects were sacrified for tissue specimen at the period of postoperative 1, 2. 4 and 6 weeks, respectively, and the specimens were stained with Hematoxilin and Eosin for general findings and with Toluidine blue for nerve cells and mast cell. The obtained results were as follows 1. In control group the regeneration were slowly and slightly progressed when compared with experimental groups. As a result, mild nerve degeneration and surrounding tissue inflammation were still observed at postoperative 6-week in control group but in experimental groups, early regenerative changes in Schwann cell and mild fibrosis in perineural granulation tissue were shown at postoperative 4-week. 2. In postoperative findings, degeneration of axon were more severe than that of Schwann cell in both groups. But in experimental groups, degeneration of endoneurium and perineurium were rapidly decreased and mast cells were much more observed. 3. Laser irradiation on sciatic nerve regeneration was efficient, but the difference by the amount of irradiation time in two experimental groups was not distinct.