• Journal of Oral Medicine and Pain
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• v.19 no.2
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• pp.81-97
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• 1994

두개하악장애는 환자의 신체적 소인, 관련조직의 구조적 변화, 정신적 스트레스 등의 복합적 요인에 의 발생하는 다인성 질환으로 최근 대두되는 원인중의 하나가 신체, 특히 두경부의 자세이상이다. 비정상적인 두경부자세는 하악의 위치변화를 수반하여 종종 두개하악장애를 야기시키게 되나 이를 설명할 수 있는 과학적 증거는 아직 부족한 실정이다. 저자는 두경부 자세가 교합장치물에 의해 변화되는지를 저작근의 근전도학적 측면에서 규명하고자 21세에서 26세의 치과대학생으로 치아상실 및 교합간섭이 없고 두 개하악장애의 증후 및 경부운동제한을 가지지 않은 정상인 20명을 대상으로 각도계를 사용하여 시상면상에서 인위적으로 유도한 세 가지의 두경부자세변화 (0$^{\circ}$, 30$^{\circ}$ 굴절, 45$^{\circ}$ 신전)에 따른 교합안정장치의 장착(1시 간) 전후 및 안정위와 근접촉위(초기치아접촉위)에서의 두경부 근육(측두근, 교근, 악이복근)의 근전도를 Bioelectric Microprocessor EM2ⓡ를 사용하여 측정한 후 통계학적으로 비교, 분석, 평가하여 다음과 같은 결과를 얻었다. 1. 교합안정장치 장착전 하악 안정위 및 근접촉위에서 두부의 30$^{\circ}$굴절은 악이복근의 근활성도를, 45$^{\circ}$신전은 교근 및 악이복근의 근활성도를 증가시켰다.(p<0.05) 2. 교합안정장치 장착후 하악 안정위에서 두부의 30$^{\circ}$굴절은 악이복근의 근활성도를, 45$^{\circ}$신전은 교근 및 악이복근의 근활성도를 증가시켰으며, 하악 근접촉위에서 두부의 45$^{\circ}$신전은 악이복근의 근활성도를 증가시켰다(p<0.05). 3. 교합안정장치 장착 전후 및 두부의 30$^{\circ}$굴절, 45$^{\circ}$신전에 따른 측두군 및 교근의 하악 근접촉위에서의 근활성도가 안정위에서의 근활성도에 비해 유의한 증가를 나타냈다(p<0.05).

• The Journal of Korean Academy of Prosthodontics
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• v.58 no.2
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• pp.130-136
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• 2020

Fabrication of complete denture with suction mechanism was introduced to enhance the retention and stability of denture by sealing around the denture border by forming negative pressure on the inner side of denture base during functional movement such as swallowing or masticating. Mandibular suction dentures reduce denture dislodging force during opening by taking preliminary impression without pressure on retromolar pad area in rest position. In this case, fabrication of complete denture using suction mechanism for an edentulous patient with severe alveolar bone resorption allowed us to clinically enhance retention and stability of denture and improve satisfaction of patient.

• The Journal of Korean Academy of Prosthodontics
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• v.25 no.1
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• pp.213-226
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• 1987

The purpose of this study was to standardize and classify the coordination pattern among the left and right masseter and anterior temporal muscles, in terms of integrated EMG values per stroke during gum chewing in normal subjects. In this study, 20 normal subjects were selected to chew a piece of gum and integrated EMG from middle portion of the masseter and anterior temporal muscles on both sides were recorded 20 times during each of the right and left chewing respectively. And the Bioelectric Processor Model EM2 (Myo-tronies Research, Inc., U.S.A.) with the surface electrodes was used to record the EMG activity during all experimental procedures. The results were as follows; 1. In all subjects, the chewing side masseter muscle was predominantly active among the four muscles examined. 2. The integrated EMG value of the middle of masseter muscle was significantly predominant than those of the anterior temporal muscle (p<0.0001) on the chewing side, but no significant predominant was observed on the nonchewing side (p<0.98). 3. In comparison with same muscles on the chewing and nonchewing side, low correlation coefficient was found between the middle of masseter muscles (R=0.317), but high correlation coefficient was found between the anterior temporal muscles (R=0.738). Between two muscles on the same side, there were significant correlation in the chewing (R=0.557) and nonchewing side (R=0.625). 4. In the coordination patterns among four muscles examined, distinct individual differences were found, but in an identical subject one fixed pattern appeared with significant reproducibility.

• The Journal of Korean Academy of Prosthodontics
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• v.29 no.1
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• pp.53-71
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• 1991

This study was performed to investigate the muscular activity of the complete denture wearers compare with subjects with natural teeth. For the study, 10 subjects with natural dentition and 18 upper and lower complete denture wearers selected and the Bio-electric Processor EM2(Myo-tronics Reaserch, Inc., U.S.A.) with the surface electrodes was used to record electromyographic activity from the right and left middle of masseter and anterior temporal muscles of each subject during mandibular postural rest position, tapping of teeth from postural rest position, maximal clench, and right and left gum and raw carrow chewing. This results of this study were as follows : 1. In mandibular postural rest position, the denture wearers produces high muscular activity in contrast to natural objects(P<0.05) but, there was no difference between the state of denture removal and insertion, and the muscle activity of the anterior temporal muscle was high than the middle of masseter muscle in natural objects and denture wearers. 2. In tapping of teeth, there was no difference in muscle activity between natural objects and the state of denture removal of denture wearers. 3. In maximal clench, there was markedly lower denture wearers than natural objects in muscle activity, and the ratio of mean voltages was about 36 percentages. 4. In gum and raw carrow chewing, the activity was lower than natural object, the ratio was about 59 percentages. 5. In chewing, the mean voltages of the middle of masster muscle on the chewing side was highest, followed by the anterior temporal on the chewing side, the anterior temporal and masster muscles on the non-chewing side.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.3
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• pp.543-549
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• 2005

The maxillary canine is especially important as it has the longest root, provides guidance for lateral movement of the mandible and masticatory function and is a key in esthetics due to its position. Maxillary canine has the longest time to develop and a complex route from the place of formation to the site of eruption, and so it is prone to impaction more than other teeth. The clinician should consider the various treatment options : (a) No treatment and observation, (b) surgical exposure and orthodontic traction (c) autotransplantation (d) extraction. Surgical exposure of the canine and orthodontic treatment to bring the tooth into the line of occlusion is considered the most desirable approach. This case presents the results of treatment for impacted maxillary canine by surgical exposure and orthodontic tooth movement.

• Journal of the Korea Convergence Society
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• v.8 no.4
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• pp.139-148
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• 2017

The purpose of this study was to investigate the effects of stress on oral health and health behaviors. The study was conducted on 72,060 people using 11th Youth Health Behavior Online Survey in 2015. The study shows that In general, female students, high school students and students with high performance ranking are more stressful than male students, middle school students and students with low performance ranking respectively. Studies have shown that students who do not exercise a lot and have not breakfast get relatively high stress. Plus, the stress index was also high and statistically significant. (p<0.001). The study also shows that students who have got symptoms of "tooth pain when eating" and "bleeding gun" at the questionnaire of "Self-assessed Oral health status"get high stress relatively. And the study tells us that students who have bad breath get high stress relatively as well. And, the stress index was also high and statistically significant. (p<0.001). The implications of this study are that psychological stress among adolescents has a close relationship with oral health and health behavior.

• The Journal of Korean Academy of Prosthodontics
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• v.59 no.4
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• pp.459-468
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• 2021

In patients with myasthenia gravis, it is difficult to manufacture and maintain dentures because the muscles and nervous system in the oral cavity are not properly adjusted. In addition, excessively extended or thick dentures may cause muscle weakness by stimulating the muscles, so dentures should be manufactured in consideration of this. In this case, a denture was fabricated using the closed mouth technique in a patient with myasthenia gravis with mouth opening limitation. Using the closed mouth technique, the patient's masticatory pressure and muscle movements were reproduced and denture with good retention were manufactured.

• Journal of Oral Medicine and Pain
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• v.36 no.3
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• pp.187-197
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• 2011

Temporomandibular disorders(TMD) is a collective term which is embracing a number of clinical problems that involve the masticatory musculature, the TMJ and associated structures, or both. Myofascial pain, which is a kind of masticatory muscle disorder of TMD, is the sensory, motor, and autonomic symptoms caused by myofascial trigger points. There has been some controversies regarding etiologies of TMD and MFP. Especially the issue of occlusal conditions has been a critical issue for long time. Despite much efforts, the results of studies regarding occlusal conditions were contradictory. These controversies might be mostly due to various factors resulting from the complex nature of TMD, however, inaccurate and inappropriate study design, selection criteria, methodologies also play significant roles. Recently, a computerized occlusal analysis system, T-Scan II which made it possible to reveal quantifiable time data and relative force data for analyzing occlusion, was introduced. Some authorities suggested that the concept of disclusion time and prolonged disclusion time of posterior tooth and MFP are related using T-Scan II. But the previous studies which used T-SCAN II are not reliable for they did not provide accurate diagnostic criteria of MFP. Morever they did not compare with controls, and had many other problems. The purpose of this study was to evaluate the relationship between MFP and prolonged disclusion time of posterior tooth, which is one of the occlusal factors of TMD, by selecting 30 subjects as the study group through strict criteria and comparing them with 38 controls using T-SCAN II, computerized occlusal analysis system. The results, statistically analyzed, are summarized as follows: 1. Cronbach ${\alpha}$ coefficient of repeated measurements of disclusion time was 0.92. 2. There were no statistically significant differences at repeated measured disclusion time of both side between control and study group. 3. There was no statistically significant diffefence in the disclusion time between right and left side. From the results above, we can suggest that there was no relationship between MFP and disclusion time, so irreversible treatments leading to the reduction of disclusion time for treating MFP would not be appropriate. However more controlled, large scaled study, which consider various occlusal factors, and quantification of symptoms using Helkimo index would be necessary in the future.

• Proceedings of the Korean Society for Environmental Edudation Conference
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• 2004.12a
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• pp.43-58
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• 2004

환경운동 10년의 결과 '생태적 감수성'이라는 '감성영역'이 새롭게 개발되고 보편화 되었으며, 녹색소비의 정신이 확산되고, '환경'은 늘 관심을 기울어야 하는 '문제영역'으로 설정될 수 있었다. 이는 환경교육에도 확산되어, 녹색소비 운동과 관리주의적 실천은 이제 보편화되었다. 지방정부에서 '의제21'을 채택하여 개발연대에 직강화된 '도시하천'의 생태적 복원이 활발하게 진행중이고, 초중고교의 '녹색화' 사업이 생태숲이나 생태연못 등등의 명칭하에 진행중이다. 한편 '환경교육진흥법'은 아직 계류중이긴 하나, 경기도와 같이 지방정부 수준에서 체험적 생태교육 시설을 정책적으로 확장해 나가고자 하는 흐름도 있다. 또한 1999년의 동강댐 반대투쟁, 2003년과 2004년의 새만금 저지투쟁과 부안항쟁을 거치면서 생명의 소중함에 대한 인식은 이제 '생명권' 개념의 확산을 앞두고 있을 정도로 보편화되고 있다. 그리고 이는 생태적 감수성을 함양하는 '체험 환경교육'의 보편화로 나타나고 있다. 하지만 교과교육으로서의 환경교육과 체험학습 영역의 환경교육은 '접점'을 찾지 못하고 있다. 한편으로 온 나라를 떠들썩하게 만드는 '환경갈등'에 대하여 그것의 '뿌리'를 완전히 뽑아내는 방식의 '재발 방지' 정치적 성과는 제대로 축적되고 있지 못하며, 환경교육은 '환경갈등'의 정치경제적 속성을 정면으로 응시하고 있지 못하다. 2004년의 환생교사업방향중 하나가 '사회적 실천'을 강조하는 흐름이었던 것은 바로 이와 같은 사정을 반영한다. '생태적 감수성'은 실천이라기 보다 안주와 '누림'의 영역으로 되기 십상이었기에 그러하며 실제로 상품화된 '생태기행'의 등장은 그런 맥락에서 이해된다. 그럼에도 이는 10년전 '군사문화'가 우리안에 살아있던 것에 비하면 분명 큰 진전이다. 군사훈련식의 수련활동이 생명과 생태에 대한 감수성을 일깨우는 '생태적 감수성' 함양으로 전환된 것이 단적인 경우이다. 이제 이러한 성과를 토대로 이후 학교환경교육 10년을 전망할 수 있어야 하겠다. 필자는 그 화두를 '환경정의'와 '생태적 합리성'에서 찾고자 한다. 생태적 감수성 키우기가 상업화 단계에 이를 정도로 보편화되었다면, 이를 바탕으로 '생태적 합리성'이라는 체계적인 지식교육을 거쳐서, '환경정의' 의식의 제고로 이어가고, 굵직한 '환경갈등'의 상황에서 뚜렷한 정치적 태도와 실천을 할 수 있는 '생태적 인간상'의 육성으로 나아갈 수 있어야 한다는 것이 필자의 생각이다. 이를 위해서는 어찌되었건 체험학습 영역에서는 환경현안에 대한 사회적 실천을 '교육 소재'로 삼을 수 있어야 하며, 교과학습 영역에서는 한국사회의 환경현안에 대한 정치경제적 접근을 외면하지 말고 교과서 저작의 소재로 삼을 수 있어야 하며, 이는 '환경관리주의'와 '녹색소비'에 머물러 있는 '환경 지식교육'과 실천을 한단계 진전시키는 작업으로 이어질 것이다. 이후 10년의 환경교육은 바로 '생태적 합리성'과 '환경정의'라는 두 '화두'에 터하여 세워져야 한다.

• The Journal of Korean Academy of Prosthodontics
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• v.61 no.3
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• pp.234-244
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• 2023

Tooth wear refers to the loss of dental hard tissue caused by various physiological and pathological causes, and excessive pathological wear can cause complications such as pathological changes in dimensions, occlusal disharmony, loss of function, and aesthetic problems. The cause of tooth wear can be caused by attrition, abrasion, corrosion and abfraction, and it is known to act in a multifactorial etiology in interocclusal activity. In patients with excessive pathological wear, it is important to determine whether or not the vertical dimension of occlusion is reduced, and complete oral rehabilitation should be achieved with the adaptation of the neuromuscular and temporomandibular joint through accurate diagnosis and analysis. The patient in this case was a 63-year-old male patient, who presented discomfort to cold beverage due to severe tooth wear. After analysis of the patient's vertical dimension of occlusion, a full mouth rehabilitation was performed with increasing vertical dimension of occlusion. The goal of treatment was to improve the occlusal plane with the equal-intensity contact of all teeth, harmonious anterior guidance and immediate disclusion of all posterior contacts. After rehabilitation, the patient was satisfied with function and esthetic appearance.