• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제43권2호
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• pp.134-137
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• 2017

Giant cell tumor (GCT) of the craniofacial bones has been reported but they are not common. This tumor occurs more often in women than in men and predominantly affects patients around the third to fifth decade of life. GCTs are generally benign but can be locally aggressive as well. We report a case of GCT involving the temporomandibular joint (TMJ), which was initially thought to be temporomandibular disorder (TMD). A 22-year-old female presented with swelling and pain over the right temporal region for 18 months associated with jaw locking and clicking sounds. On examination, her jaw deviated to the right during opening and there was a $2{\times}2$ cm swelling over the right temporal region. Despite routine treatment for TMD, the swelling increased in size. Computed tomography and magnetic resonance imaging of the brain and TMJ revealed an erosive tumor of the temporal bone involving the TMJ which was displacing the temporal lobe. Surgical excision was done and the tumor removed completely. Histopathological examination was consistent with a GCT. No clinical or radiological recurrence was detected 10 months post-surgery.

• 대한장애인치과학회지
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• 제11권2호
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• pp.62-66
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• 2015

Temporomandibular joint dislocation causes considerable pain, discomfort, and swelling. The anatomic construction of the articular fossa and the eminentia articularis may predispose to dislocation, and weakness of the connective tissue forming the capsule is believed to be a predisposing factor. The capsule may be stretched and, more rarely, torn. Dislocation may be unilateral or bilateral and may occur spontaneously after stretching of the mouth to its extreme open position, such as during a yawn or during a routine dental operation. Manual reduction with the patient under muscle-relaxing condition or anesthesia is recommended method. After the reduction of an acute dislocation, immobilization of the jaw is recommended to allow the stretched and sometimes torn capsule to heal, thus preventing recurrence. A Barton's bandage may be applied for 2 to 3 weeks to prevent the patient from opening the jaw too wide. But, it results in recurrent dislocation in the neurologically disabled patient, because of loose intermaxillary fixation. This is a case report about management of recurrent temporomandibular joint dislocation by multiple loop wirings and intermaxillary elastics in cerebrovascular accident patient.

• 말소리와 음성과학
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• 제2권4호
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• pp.51-58
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• 2010

English vowels play an important role in the daily communication between Korean students and international visitors. However, many Korean students still have difficulty producing them distinctively. Vowels vary according to shapes of oral and pharyngeal cavities, which are mainly determined by the degree of jaw opening and tongue position. Yang (2008a) proposed a simplified chart of English and Korean vowels for an educational purpose. He also suggested to use wooden chopsticks to secure distinguishable jaw openings. The purpose of this study is to tap whether wooden chopsticks can be applicable to a method for correcting English vowel pronunciation. Twelve male and female students participated in the recordings of eight /hVd/ words followed by additional recordings with wooden chopsticks between upper and lower teeth. The first and second formant trajectories of both natural and controlled vowel productions were obtained and compared at six equidistant measurement points using Praat. Results showed that the formant values of natural vowel productions were comparable to those of controlled productions. Vowels with similar formant trajectories of male students were separated with the aid of chopsticks. The width of each chopstick could be controlled similarly in the experiment. The author concludes that wooden chopsticks can be useful to correct vowel pronunciation. Further studies are desirable for native speakers to make perceptual evaluations of controlled vowel productions by nonnative speakers.

• 말소리와 음성과학
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• 제7권1호
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• pp.151-163
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• 2015

In this study, we aim to describe kinematic characteristics of Korean /l/-flapping in two speech rates (fast vs. comfortable). Production data was collected from seven native speakers of Seoul Korean (four females and three males) using electromagnetic midsagittal articulometry (EMMA), which provided two dimensional data on the x-y plane. We examined kinematic properties of the vertical/horizontal tongue tip gesture, the vertical/horizontal (rear) tongue body gesture, and the jaw gesture in an /i/-/i/ context. Gestural landmarks of the vertical tongue tip gesture are directly measured. This serves as the actual anchoring time points to which relevant measures of other trajectories referred. The study focuses on velocity profiles, closing/opening spatiotemporal properties, constriction duration, and constriction minima were analyzed. The results are summarized as follows. First, gradiently distributed spatiotemporal values of the vertical tongue tip gesture were on a continuum. This shows more of a reduction in fast speech rate, but no single instance of categorical reduction (deletion). Second, Korean /l/-flapping predominantly exhibited a backward sliding tongue tip movement, in 83% of production, which is apparently distinguished from forward sliding movement in English. Lastly, there was an indication of vocalic reduction in fast rate, truncating spatial displacement of the jaw and the tongue body, although we did not observe positional variations with speech rate. The present study shows that Korean /l/-flapping is characterized by mixed articulatory properties with respect to flapping sounds of other languages such as English and Xiangxiang Chinese. Korean /l/ flapping demonstrates a language-universal property, such as the gradient nature of its flapping sounds that is compatible with other languages. On the other hand, Korean /l/-flapping also shows a language-particular property, particularly distinguished from English, in that a backward gliding movement occurs during the tongue tip closing movement. Although, there was no vocalic reduction in V2 observed in terms of jaw and tongue body height, spatial displacement of these articulators still suggests truncation in fast speech rate.

• 대한치과교정학회지
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• 제49권4호
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• pp.254-264
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• 2019

Objective: To evaluate the short-term changes in masticatory muscle activity and mandibular movement patterns after orthognathic surgery in skeletal Class III patients with facial asymmetry. Methods: Twenty-seven skeletal Class III adult patients were divided into two groups based on the degree of facial asymmetry: the experimental group (n = 17 [11 male and 6 female]; menton deviation ${\geq}4mm$) and control group (n = 10 [4 male and 6 female]; menton deviation < 1.6 mm). Cephalography, electromyography (EMG) for the anterior temporalis (TA) and masseter muscles (MM), and mandibular movement (range of motion [ROM] and average chewing pattern [ACP]) were evaluated before (T0) and 7 to 8 months (T1) after the surgery. Results: There were no significant postoperative changes in the EMG potentials of the TA and MM in both groups, except in the anterior cotton roll biting test, in which the masticatory muscle activity had changed into an MM-dominant pattern postoperatively in both groups. In the experimental group, the amount of maximum opening, protrusion, and lateral excursion to the non-deviated side were significantly decreased. The turning point tended to be shorter and significantly moved medially during chewing in the non-deviated side in the experimental group. Conclusions: In skeletal Class III patients with facial asymmetry, the EMG activity characteristics recovered to presurgical levels within 7 to 8 months after the surgery. Correction of the asymmetry caused limitation in jaw movement in terms of both ROM and ACP on the non-deviated side.

• Journal of Oral Medicine and Pain
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• 제38권4호
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• pp.333-338
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• 2013

Purpose: 특정한 형태의 이명은 그 발생에 있어서 청각계와 체성감각계의 상호작용이 핵심적인 역할을 하고 있음을 시사하는 증거들이 지속적으로 연구되어 발표되고 있다. 이러한 맥락에서 본 연구는 턱의 운동이 이명에 미치는 영향을 조사하고자 계획되었다. Methods: 163명 이명 환자의 217귀를 대상으로 순음청력검사, 이명의 특성에 대한 설문조사, 이명의 크기, 지속시간 및 괴로운 정도에 대한 시각사상척도(visual analogue scale) 조사와 함께 9 항목의 턱관절의 등척성 운동에 따른 이명의 크기 변화를 조사하는 이명의 체성조절 검사를 시행하였다. Results: 체성조절 검사를 시행한 이명 환자의 217귀 중 125귀(57.6 %)에서 이명의 크기가 변함을 관찰할 수 있었다. 일측성 이명 109귀중 70귀(64.2%)에서 체성조절에 반응하여 양측성 이명 108귀중 55귀(50.9%)의 반응보다 유의하게 높은 빈도를 보였다(p<0.05). 검사 항목 모두에서 이명의 크기 증가가 감소보다 더 자주 관찰되었고, 크기 증가의 빈도는 6.7-15.4%로 개구 및 이악물기 항목에서 가장 자주 이명의 크기 증가가 유발되었다. Conclusion: 본 연구 결과, 턱의 운동은 이명을 악화 혹은 유발시킬 수 있으며, 체성조절 검사는 턱 관절의 자극이 이명의 유발 및 악화요인 인가를 평가하는 방법으로 활용할 수 있을 것으로 생각된다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권2호
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• pp.298-307
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• 1996

Osteochondroma is a common benign tumor of the axial skeleton, especially the distal metaphysis of the femur and the proximal metaphysis of the tibia, however, is occurred rarely on the facial skeleton. Development of the tumor is most frequently seen in the second or third decades of life. Typically, it arises directly from the cortex of the underlying bone, without any intervening zone of abnormal osseous tissue, and is covered by a cap composed of cartilage undergoing calcification. In case of osteochondroma of the mandibular condyle, its clinical features are occulusal change, facial asymmetry, headache, pain and click on temporomandibular joint, mouth opening limitation, and jaw deviation to involved site. This is a case report of a 13-year old woman who had mouth opening limitation and severe temporomandibular joint pain. We obtained successful results with surgical removal of the osteochondroma on the mandibular condyle.

• 한국의학물리학회지:의학물리
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• 제16권2호
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• pp.70-76
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• 2005

기능강화동적쐐기는 쐐기 형태의 선량 분포를 만드는 방법과 선량 특성적인 면에서 금속쐐기와 상당한 차이를 가지고 있다. 기능강화동적쐐기의 임상적용을 위해서는 금속쐐기와 다른 선량특성을 분석하고 이에 따른 적절한 커미셔닝이 필수적이다. 본 연구의 목적은 기본 선량계측인자에 기초한 기능강화동적래기와 금속쐐기의 선량특성을 분석하는 데 있다 선량 계측학적 특성을 나타내는 심부선량분포, 조사면 주변 선량, 표면선량, 실효 쐐기인자, 쐐기의 선량측면도를 측정, 분석하였다. 또한 열린 조사면과 금속쐐기와의 비교측정을 통해 기능강화동적쐐기가 가지고 있는 고유한 특성을 분석하였다. 기능강화동적쐐기의 선량측면도 측정은 Chamber Array 24 (CP24)를 이용하였으며, Golden Segmented Treatment Table (Golden-577)로 구현한 치료 계획 장치의 계산 값과 비교하였다. 또한 실호쐐기인자 측정은 각각의 X, Y 콜리메이터에 따른 특성을 분석하였다. 심부 선량 백분율측정에서 열린 조사면과 기능강화쐐기의 비교결과, $0.2\~0.5\%$ 이내로 일치하였고, 금속 쐐기인 경우 약 $2\%$의 비교적 큰 차이를 보였다. 조사면 주변선량측정에서는 금속쐐기가 약 $1\%$ 높았다. 표면선량 측정 결과, 금속쐐기가 약 $10\%$ 낮게 평가되었다 기능강화쐐기의 실효쐐기인자는 Y jaw가 커짐에 따라 연속적으로 감소됨을 알 수 있었다. X jaw에 따른 쐐기인자 의존도 측정에서는 X jaw에 따른 의존도는 거의 없는 것으로 평가되었다. 또한 비대칭 조사면의 쐐기 인자측정에서는 비대칭에 상관없이 Y jaw의 크기만 같으면 실효쐐기인자가 같았다. 선량측면도 측정에서는 CA24를 이용해 얻은 실측값과 Golden STT로 Cadplan에서 구현한 계산 값이 $1\%$이내로 일치하였다. 본 연구를 통해 기능강화동적쐐기가 가지고 있는 특성을 분석하였으며, 금속쐐기를 대체할 수 있는 유용한 도구임을 알 수 있었다.

• Journal of Oral Medicine and Pain
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• 제31권1호
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• pp.69-77
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• 2006

저작근과 관련하여 나타나는 여러 운동장애의 치료나 심미적인 목적으로 교근 부위에 보툴리눔 독소를 주사하는 방법이 널리 이용되고 있다. 그러나 보툴리눔 독소의 교근 부위 주사가 다른 저작근의 근전도와 악기능에 어떠한 영향을 미치는 지에 대한 자료는 부족하다. 이에 본 연구에서는 측두하악관절장애 등 하악의 기능 이상을 가지고 있지 않는 건강한 성인남녀 14명을 대상으로 양측 교근에 각각 80 unit씩의 보툴리눔 독소 A(Dysport, Ipsen, Wrexham, UK)를 주사한 5 명의 실험군과 같은 위치에 같은 양의 생리식염수를 주사한 9 명의 대조군에서 주사 전과 주사 후 3 주까지 매주 교근과 전측두근의 표면 근전도를 측정하고, 국문판 악기능제한지수(Jaw Functional Limitation Scale) 설문지를 이용하여 악기능제한 정도를 평가하여 비교 분석하였다. 교근의 근전도는 실험군에서 주사 후 1주부터 감소하기 시작하여 3주 동안 지속적인 감소를 나타냈으며, 전측두근의 근전도는 유의한 변화를 나타내지 않았다. 악기능제한지수는 저작지수와 전반적 악기능 지수가 실험군에서 보툴리눔 독소 주사 후 1 주째에 증가한 뒤 점차 회복하는 양상을 보였으며, 개구지수와 대화 및 감정표현 영역 기능제한지수는 통계적으로 유의한 변화를 보이지 않았다. 이러한 결과로부터 교근에 시행하는 보툴리눔 독소 주사는 교근의 활성을 지속적으로 저하시키지만 전측두근의 활성에는 영향을 미치지 않았으며, 주관적 저작기능을 단기적으로 저하시키나, 근활성의 저하가 지속되는 과정에서도 주관적 저작기능은 짧은 기간 내에 회복됨을 알 수 있었다.

• 대한치과보철학회지
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• 제36권3호
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• pp.427-452
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• 1998

To elucidate the effects of food texture such as hardness, cohesiveness, adhesiveness on mastication procedure, the electromyographic activity (EMG) of the masticatory muscles and the chewing movements were analyzed in eighteen young subjects during ordinary chewing. Seven different foods were selected by sensory texture profiling and mechanical test with texturometer; egg white, sausage, pizza cheese, yang-geng, biscuit, peanut and almond. The indexes of jaw movements used were the chewing number, chewing time, maximum opening, average opening, closing velocity and opening velocity. The EMG indexes analyzed were maximum and average integrated amplitude of the anterior temporal and masseter muscles. The results obtained were as follows. 1. The chewing time and chewing number, mandibular displacement and mandibular movement velocity were not changed by the hardness, cohesiveness and adhesiveness of the food (p>0.05). 2. The harder food materials showed a higher amplitude of the anterior temporal muscle integrated EMGs than the softer ones (p<0.05). 3. The maximum and average integrated EMGs of the masseter muscle increased with the increase of hardness of the food (p<0.05). 4. The integrated EMGs of preferred side and non-preferred side masticatory muscles increased with the increase of hardness of the food (p<0.05). 5. The adhesiveness and cohesiveness of the food were not the determining factor to the integrated EMGs of masticatory muscles (p<0.05).