• Journal of Yeungnam Medical Science
• /
• 제9권2호
• /
• pp.321-326
• /
• 1992

영남대학교 의과대학 흉부외과학 교실에서는 1985년 6월 부터 1992년 8월까지 35세이상의 성인 심방중격환자를 수술로 치험한 15례에서 다음과 같은 결과를 얻었다. 1. 수술은 11례(73%)에서 인조포편 및 자가심막을 사용하여 봉합하였다. 2. 단락정도와 수축기 폐동맥압과의 관계에서 특이한 상관관계가 없었다. 3. 술전의 뉴욕심장협회 기능분류 II가 6명, III이 8명 이었는데 술후 I이 8명, II가 6명으로 증상의 호전 있었다. 4. 심방세동 4례중 술후 3례에서 지속적으로 나타났고 1례에서는 정상리듬으로 돌아왔다. 5. 수술사망율은 없었고 수술결과는 만족하였다.

• 대한치과교정학회지
• /
• 제40권1호
• /
• pp.50-60
• /
• 2010

본고의 목적은 2급 1류 치열안면 구조를 가지는 한 환자에 적용된 새로이 고안된 상악 대구치 원심 이동 장치인 Frog appliance의 효과를 평가하기 위함이다. 11세의 여자 환자가 교정 치료를 위해 본 진료실로 의뢰되었다. 환자는 미약한 2급 골격관계와 2급의 대구치 및 견치 관계를 양측 모두에서 보이고 있었다. 고정성 장치 치료를 통해 양측 상악 제1대구치를 원심 이동시키는 방법을 포함하는 치료 계획을 수립하였으며 상악 대구치를 원심 이동하기 위해 새로이 고안된 Frog appliance를 제작 및 적용하였다. 측모 두부방사선 사진으로 치료 결과를 평가하였으며 상악 제1대구치의 원심 이동이 4개월의 치료 기간 동안 이루어 졌고 1급의 구치 관계가 얻어졌다. 총 치료 기간은 16개월이 소요되었다. 두부방사선 사진을 평가한 결과 약간의 고정원 상실과 함께 대구치의 원심 이동이 치축 이동에 가깝게 일어난 것을 확인하였다. 결론적으로 Frog appliance는 환자의 협조를 요하지 않는 장치로서 간단하고 효과적으로 양측 대구치의 원심이동을 이룰 수 있는 구내 장치이다.

• 한국정보통신학회논문지
• /
• 제2권1호
• /
• pp.27-35
• /
• 1998

본 논문에서는, 제2종 $(1+D)^2$ 부분응답 시스템의 대역제한 여파기를 원하는 전송속도에 따라 한정함으로써 향상된 대역효율을 얻을 수 있는 새로운 모델을 제안하였다. 전송시스뎀의 스펙트럼을 나이퀴스트 속도 초과량만큼 절단하는 모델을 설정하고, 그 제반 특성을 시간영역 및 주파수영역에서 해석하여 기존의 시스템과 비교하였다. 제안된 시스템은 나이퀴스트 속도 이상에서 동작할 때, 그 고유의 속도융통성으로 보상하는 기존의 시스템에 비하여 우수한 성능을 나타낸다. 특히, 이러한 특성은 이전에 해석되었던 제1종 및 제4종 부분응답 시스템에 비하여 매우 효과적이어서, 속도융통성으로 약 26.6%까지 보상할 수 있었던 기존의 초과량을 약 40% 이상으로 향상시킬 수 있음을 확인하였다. 이는, 제2종 부분응답 시스템의 전달함수로 주어지는 상승여현 스펙트럼이, 동일한 양의 스펙트럼 절단에 대하여 그 주파수 성분이나 에너지의 손실을 효과적으로 상쇄한다는 사실에 근거를 둔다. 이를 입증하기 위하여, 설정된 모델의 사이드로브 상쇄효과를 보여주는 시간영역 해석과 그 실측패턴을 제시하고, 대역효율의 증가에 따르는 눈 모양의 변화와 전송신호의 스펙트럼 특성을 실험적으로 확인하였다.

• Imaging Science in Dentistry
• /
• 제50권2호
• /
• pp.105-115
• /
• 2020

Purpose: This study investigated the position of the hyoid bone and its relationship with airway dimensions in different skeletal malocclusion classes using cone-beam computed tomography (CBCT). Materials and Methods: CBCT scans of 180 participants were categorized based on the A point-nasion-B point angle into class I, class II, and class III malocclusions. Eight linear and 2 angular hyoid parameters(H-C3, H-EB, H-PNS, H-Me, H-X, H-Y, H-[C3-Me], C3-Me, H-S-Ba, and H-N-S) were measured. A 3-dimensional airway model was designed to measure the minimum cross-sectional area, volume, and total and upper airway length. The mean crosssectional area, morphology, and location of the airway were also evaluated. Data were analyzed using analysis of variance and the Pearson correlation test, with P values <0.05 indicating statistical significance. Results: The mean airway volume differed significantly among the malocclusion classes(P<0.05). The smallest and largest volumes were noted in class II (2107.8±844.7 ㎣) and class III (2826.6±2505.3 ㎣), respectively. The means of most hyoid parameters (C3-Me, C3-H, H-Eb, H-Me, H-S-Ba, H-N-S, and H-PNS) differed significantly among the malocclusion classes. In all classes, H-Eb was correlated with the minimum cross-sectional area and airway morphology, and H-PNS was correlated with total airway length. A significant correlation was also noted between H-Y and total airway length in class II and III malocclusions and between H-Y and upper airway length in class I malocclusions. Conclusion: The position of the hyoid bone was associated with airway dimensions and should be considered during orthognathic surgery due to the risk of airway obstruction.

• 대한치과교정학회지
• /
• 제21권2호
• /
• pp.325-340
• /
• 1991

There are evidences that occlusal splint therapy is critical to diagnose hidden akeleto-occlusal disharmonies in malocclusion patients and capable of enhancing stability after orthodontic treatment. In addition, evidences have implicated occlusal splint therapy in condylar positional changes during TMJ disorder treatment. In view of these evidences, this study was performed to investigate the effect of occlusal splint therapy on condylar positional changes in malocclusion patients and the possible clinical application of the occlusal splint as an additional orthodontic tool. For this study, 8 Angle's Class I malocclusion patients, who had centric occlusion-centric relation discrepancy within 1.0 mm and had no clinical symptoms of TMJ disorder, were selected as control group. And 22 malocclusion patients who had centric occlusion-centric relation discrepancy over 1.0 mm were selected and subdivided as Class I Malocclusion group, Class II div. 1 malocclusion group, Class II div. 2 malocclusion group, Open bite group, and Mandibular asymmetry group. For each subject the occlusal splint with mutually protected type of occlusal scheme was applied for 3 months. Condylar positions in centric relation and centric occlusion were measured using Panadent articulators and Panadent condylar position indicator (CPI) before and after occlusal splint therapy. On the basis of this study, the following conclusions might be drawn: 1, In control group, Class II div. 2 malocclusion group, and mandibular assymetry group, there were no significant differences in condylar positions before and after occlusal splint therapy. 2. In Class I malocclusion group, condyles were moved $0.27{\pm}0.45mm$ forward (p < 0.05) and $0.98{\pm}0.25mm$ upward (p < 0.01) after occlusal splint therapy. 3. In Class I malocclusion group, condyles were moved $0.24{\pm}0.21mm$ backward (p < 0.05) and $1.01{\pm}0.33mm$ upward (p < 0.01) after occlusal splint therapy. 4. In open bite group, condyles were moved $1.24{\pm}0.30mm$ upward (p < 0.01) after occlusal splint therapy. 5. In both control and experimental groups, there were no significant differences in lateral condylar positions before and after occlusal splint therapy.

• 대한소아치과학회지
• /
• 제11권1호
• /
• pp.121-130
• /
• 1984

Childrens between the ages of 13 and 15 years, living in Seoul, were examined in order to determine the prevalence and severity of malocclusion in the permanent dentition. This survey encompassed 981 children and an individual chart was prepared for each subject recording an original HMAR score and classification of occlusion according to Angle. Also, subjective evaluation of "treatment needs" was carried out in 581 children. The results were as follows: 1. Of the 981 children in this survey, 12,1 percent showed excellent occlusion. (0 point) 2. The 14 percent of the children who had a score of 24 and above all appeared to belong to the "treatment highly desirable" or "treatment mandatory" category. 3. The incorporation of SAR (Supplementary Assessment Record) into the HMAR can provide more sensitive method for evaluating severity of malocclusion. 4. According to Angle's classification 77.4 percent of all malocclusion belonged to Class I, 1.3 percent to Class II, Division 1, 0.9 percent to Class II, Division 2, and 11.3 percent to Class III. 5. The mean HMAR score for Class I was significantly lower than for either Class II, Division 1 or Class III. (P < 0.05) 6. A close relationship was found between the degree of "treatment needs" and the value obtained by the HMAR scoring. (chi-square test, p < 0.05) The differences between the mean HMAR scores of the various subjectively defined categories were statistically significant. (P < 0.001)

• 대한치과교정학회지
• /
• 제52권3호
• /
• pp.210-219
• /
• 2022

Objective: The purpose of this study was to examine the effectiveness and mechanism of clear aligner therapy for the correction of anterior open bite in adult nonextraction cases. Methods: Sixty-nine adult patients with anterior open bite were enrolled and classified into Angle's Class I, II, and III groups. Fifty patients presented with skeletal open bite (mandibular plane angle [MPA] ≥ 38°), whereas 19 presented with dental open bite. Fifteen cephalometric landmarks were identified before (T1) and after (T2) treatment. The magnitudes of planned and actual movements of the incisors and molars were calculated. Results: Positive overbite was achieved in 94% patients, with a mean final overbite of 1.1 ± 0.8 mm. The mean change in overbite was 3.3 ± 1.4 mm. With clear aligners alone, 0.36 ± 0.58 mm of maxillary molar intrusion was achieved. Compared with the Class I group, the Class II group showed greater maxillary molar intrusion and MPA reduction. The Class III group showed greater mandibular incisor extrusion with no significant vertical skeletal changes. Conclusions: Clear aligners can be effective in controlling the vertical dimension and correcting mild to moderate anterior open bite in adult nonextraction cases. The treatment mechanism for Class III patients significantly differed from that for Class I and Class II patients. Maxillary incisor extrusion in patients with dental open bite and MPA reduction with mandibular incisor extrusion in patients with skeletal open bite are the most significant contributing factors for open bite closure.

• 대한소아치과학회지
• /
• 제28권3호
• /
• pp.496-503
• /
• 2001

골격성 II급 1류 부정교합을 가지는 아동에서 상악골의 과도한 성장은 흔히 전후방적 요소 뿐 아니라 수직적 요소도 가지고 있는데, 그 이유는 상악골이 전하방으로 성장, 이동할 경우 하악골이 후하방 회전하기 때문이며, 하악골의 성장이 전방으로 이루어지는 것을 방해하게 된다. 따라서 이 경우 치료목표는 하악골이 더욱 돌출 되어 상악골과 정상적인 관계를 가지도록 성장하는 동안 상악골의 성장을 억제하는 것이며, 이를 위해 구외력을 적용하는 것이 현명한 방법으로 보고되고 있다. 조선대학교 소아치과에 내원한 골격성 II급 1류 부정교합 환자에서 C II activator와 headgear를 이용한 구외력을 적용후 양호한 결과를 얻었기에 보고하는 바이다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제29권1호
• /
• pp.29-35
• /
• 2016

The aim of the present study was to investigate the effect of single nucleotide polymorphisms in the major histocompatibility complex (MHC) class II gene on resistance to Newcastle disease virus and body weight of the Thai indigenous chicken, Leung Hang Khao (Gallus gallus domesticus). Blood samples were collected for single nucleotide polymorphism analysis from 485 chickens. Polymerase chain reaction sequencing was used to classify single nucleotide polymorphisms of class II MHC. Body weights were measured at the ages of 3, 4, 5, and 7 months. Titres of Newcastle disease virus at 2 weeks to 7 months were determined and the correlation between body weight and titre was analysed. The association between single nucleotide polymorphisms and body weight and titre were analysed by a generalized linear model. Seven single nucleotide polymorphisms were identified: C125T, A126T, C209G, C242T, A243T, C244T, and A254T. Significant correlations between log titre and body weight were found at 2 and 4 weeks. Associations between single nucleotide polymorphisms and titre were found for C209G and A254T, and between all single nucleotide polymorphisms (except A243T) and body weight. The results showed that class II MHC is associated with both titre of Newcastle disease virus and body weight in Leung Hang Khao chickens. This is of concern because improved growth traits are the main goal of breeding selection. Moreover, the results suggested that MHC has a pleiotropic effect on the titre and growth performance. This mechanism should be investigated in a future study.

• Journal of Periodontal and Implant Science
• /
• 제27권4호
• /
• pp.845-866
• /
• 1997

Several experimental studies showed that the application of small amounts of electric current to bone stimulated osteogenesis at the site of the cathode and suggests that the application of electrical currents to periodontal defects could promote bone and cementum formation. The purpose of this study was to determine the effect of direct microcurrent to the periodontal regeneration of class III furcation defects in dogs. Class III furcation defects were surgically created on the third and the fourth premolars bilaterally in the mandibles of nine mongrel dogs. Experimental periodontitis were induced by placing small cotton pellets into the created defects for 3 weeks. The experimental sites were divided into three groups according to the treatment modalities: Group I-surgical debridement only; Group II-allogenic demineralized freeze dried bone grafting; Group III-allogenic demineralized freeze dried bone grafting and electrical stimulation. For fluorescence microscopic evaluation, calcein, oxytetracycline HCI and alizarin red were injected 2, 4 and 8 weeksfS days prior to sacrifice) after surgery. The animals were sacrificed in the 1st, 2nd, 4th and 8th week after periodontal surgery and the decalcified and undecalcified specimens were prepared for histological and histometrical examination. After the first and the second weeks, gingival recession was more severe in group I than groups II and III. After the fourth and the eighth weeks, there was no difference in the width of junctional epithelium and connective tissue attachment among the three groups, but the width of connective tissue attachment increased in group II at the eighth week, compared to the fourth week. The amount of bone repair in new attachment was significantly greater in group III, compared to groups I and II. New attachment formation was significantly greater in group III, compared to groups I and group II. These results suggest that electrical stimulation using microcurrent generator could be a useful tool for periodontal regenerative therapy in class III furcation defect.