• Journal of the korean academy of Pediatric Dentistry
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• v.42 no.3
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• pp.242-248
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• 2015

Maximum mouth opening is regarded as an important tool used to evaluate the clinical function of temporomandibular joint and the masticatory system. It has been reported that children can also exhibit severe dysfunction or pain in some cases of temporomandibular disorder. The purpose of this study was to measure the normal maximum mouth opening in Korean children and to analyze the correlations between mouth opening and the associated factors. Maximum mouth opening was measured from 151 healthy children between the ages of 2 and 6 years old. Age, height, weight, and mouth width were also recorded. As a result, the mean maximum mouth-opening was $37.72{\pm}5.10mm$. While the values were greater in boys than in girls without statistical significance, the increases of maximum mouth opening based on age, height, weight, and mouth width were significant (p < 0.05). In children, positive correlation coefficients were observed between maximum mouth opening and the associated factors and height showed the highest correlation. In conclusion, we collected data of the normal range of maximum mouth opening in Korean children, and this study can be utilized as a basis in diagnosing pediatric temporomandibular disorder and safety standard of mouth opening during dental procedures.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.11 no.2
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• pp.87-95
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• 1989

The therapeutic methods and follow - up prognosis of subcondylar fractures in adults have always been sources of controversy. To improve the therepeutic results in subcondylar fractures with displacement, and especially, the bicondylar ones, the auther employ the surgical reduction using of sagittal split and oblique subcondylar osteotomy. This report is illustrated by six clinical cases.

• The Journal of the Korean dental association
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• v.21 no.4 s.167
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• pp.293-297
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• 1983

Bruxism이란, 일반적으로 기능이외의 목적으로 상하악 치아를 악물거나 갈음질 하는 것이라고 정의된다. 동일한 상태를 서술하는 용어로 neuralgia traumatica, Karolyi effect, occlusal habit neurosis, parafunction 등이 있으며, 수면중의 이갈음질을 bruxism, 주간의 습관성 이갈음질을 bruxomania로 구분하기로 한다. 또한 centric bruxism과 eccentric bruxism으로 분류하기도 한다. eccentric bruxism은 통상적 의미의 수면중의 bruxism이며, 하악의 측방운동중의 이갈음질이고 뽀드득하는 갈음질 소리를 냄, 저작근육의 긴장도가 증가되어 있으면서 등장성수축을 나타내고, 비중심위의(eccentric) 교합간섭이 주요 유발인자인 반면에 centric bruxism은 중심교합위에서 상하악 치아를 간헐적으로 악무는 것(clenching)은 의미하고 - 지속적으로 악무고 있는 것은 clamping이라고 함.- 주로 주간에 행하며 갈음질소리를 들을 수 없고, 역시 저자근육의 긴장도가 증가되어 있으며 등률성수축을 나타내고, 중심교합위에 근접하여 존재하는 교두간섭이 유발인자이다. bruxism이나 clenching과 부정교합의 관계는 bruxism과 clenching은 부정교합을 야기할 수 있고, 부정교합도 역시 bruxism과 clenching을 유발시키는 작용을 할 수 있는 악순환적 관계이다. 현저한 부정교합을 가지고 있는 bruxism환자의 교정치료는 그 목적이 bruxism의 치료라기보다는 오히려 부정교합의 치료이며 부차적으로 bruxism의 치료를 기대하게 된다. 그러나 bruxism이 장기간 지속되어 치아 및 그 주위조직, 악관절과 신경근계에 심한 손상을 주었을때의 교정치료는 일반적으로 제한을 받을 뿐만아니라 bruxism의 처치에는 거의 무의미한 치료가 될 수 있다. 따라서 거자는 bruxism 환자의 교정치료라는 제목의 원고 청탁을 받았으나 편집위원의 양해아래 장치를 이용한 bruxism의 치료에 관하여 서술하려 한다.

• Journal of Oral Medicine and Pain
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• v.32 no.1
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• pp.91-104
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• 2007

An epidemiologic investigation was carried out to determine the prevalence of symptoms of temporomandibular disorders in college students that aged 19-31 years. 460 students were investigated with a questionnaire from September to December 2006. The obtained results were as follows : 1. The prevalence of symptoms of temporomandibular disorders was 80.6%. 2. The most frequently complained symptom was headache and joint sound was the next one without distinct difference between men and women. 3. While the rate of occurrence of symptom of acute malocclusion decreased with age in men, that of TMJ pain during chewing or speech increased with age in women. 4. Symptoms including TMJ pain during mouth opening, chewing or speech, TMJ fatigue and acute malocclusion occurred significantly more frequently in women than in men. Contributing factors including resting cheeks on hands, stressful state, gum chewing, insomnia and clenching occurred significantly more frequently in women than in men. 5. There was a highly significant relationship between symptoms and contributing factors including resting cheeks on hands, stressful state, unilateral chewing, insomnia and clenching. 6. There was a highly significant relationship between symptoms and general personality.

• Journal of Dental Rehabilitation and Applied Science
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• v.32 no.1
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• pp.70-79
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• 2016

Patients who lost posterior teeth due to periodontitis or dental caries have collapsed vertical dimension, unstable occlusion and change of the mandibular position. In particular, patients in orthognathic surgery, clinician should re-establish the pre-operative stable position of mandibular condyle in articular fossa and favorable vertical dimension for high post-operative stability of mandible. Therefore, interdisciplinary approach and co-operation, including prosthetics, orthodontics, oral and maxillofacial surgeon, from diagnosis and treatment plan is important to get a good outcome. This case report was patients who had collapsed occlusal plane due to severe dental caries on maxillary molars with skeletal Class III malocclusion. Before orthognathic surgery, resetting of maxillary occlusal plane with temporary removable denture was performed. Then successful multidisciplinary approach was done and lead to acceptable clinical outcome.

• Journal of Dental Rehabilitation and Applied Science
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• v.31 no.3
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• pp.273-282
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• 2015

Centric occlusion-maximum intercuspation (CO-MI) discrepancy is one of main causes of evoking premature contact and resultant mandibular shift. These non-physiological conditions can induce temporomandibular disease, periodontitis, and non-carious cervical lesion. Therefore, if CO-MI discrepancy exists in patients who need extensive prosthetic rehabilitation, it must be corrected and then physiological occlusion must be restored. This report describes the treatment procedure of removing CO-MI discrepancy and prosthetic rehabilitation in a patient with 3.5 mm discrepancy, multiple caries and periodontitis. Proper mandibular position and modified opening & closing movement were confirmed by ARCUSdigma II and transcranial radiograph.

• Journal of Dental Rehabilitation and Applied Science
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• v.27 no.2
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• pp.223-231
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• 2011

The purpose of this case report is to introduce new attachment system(milled titanium bar with $Locator^{(R)}$ attachment) for implant supported overdenture in maxillary edentulous patients. A 56-years-old male patient visited the hospital due to the mobility of his maxillary fixed partial dentures(10-unit bridge). Including temporomandibular joint(TMJ), there was no specific PMHs to influence dental treatment. In radiographic and clinical evaluation, there was a severe bone resorption and mobility in maxillary teeth. Accordingly all the remaining maxillary teeth was extracted and fabrication of implant supported overdenture was planned. The milled titanium bar with $Locator^{(R)}$ was designed as an attachment system, considering the stability and retention of denture, masticatory efficiency, oral hygiene care, esthetics, pronunciation, and patient's financial state. The milled titanium bar was manufactured using CAD/CAM technology, and $Locator^{(R)}$ attachment connected to the bar by tap & drill method. For over 1-year, in terms of function and esthetics, satisfactory result was obtained.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.20 no.3
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• pp.191-200
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• 1998

This study was intended to perform the influence of condyle positional change after surgical correction of skeletal Class III malocclusion after orthognathic surgery in 37 patients(male 13, female 24) using computed tomogram that were taken in centric occlusion before, immediate after, and long term after surgery and lateral cephalogram that were taken in centric occlusion before, 7 days within the period of intermaxillary fixation, at the 24 hours later removing intermaxillary fixation and long term after surgery. 1. Mean intercondylar distance was $84.42{\pm}5.30mm$ and horizontal long axis of condylar angle was $12.79{\pm}4.92^{\circ}$ on the right, $13.53{\pm}5.56^{\circ}$ on the left side. Condylar lateral poles were located about 12mm and medial poles about 7mm away from the reference line(AA') on the axial tomogram. Mean intercondylar distance was $83.15{\pm}4.62mm$ and vertical axis angle of condylar angle was $76.28{\pm}428^{\circ}$ on the right, $78.30{\pm}3.79^{\circ}$ on the left. 2. In amount of set back, We found the condylar change(T2C-T1C) which had increasing tendency in group III (amount of setback : 10-15mm). but there was no statistical significance(p>0.05). 3. There was some correlation between condylar change(T2C-T1C) and TMJ dysfunction. It seemed that postoperative condylar change had influenced postoperative TMJ dysfunction, through there was no statistical significance (p>0.05). As we have observed the change of condylar axis in the group that complained of TMJ dysfunction in cases of large amount of mandibular setback. So we consider that the more trying to conserve condylar position will decrease occurrence rate of post operational TMJ dysfunction.

• Journal of dental hygiene science
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• v.6 no.1
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• pp.23-28
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• 2006

This study was conducted to investigate the oral health related quality of life in elders concerning to residence at urban and rural. The subjects were 215 old persons who were over the 60 years old, living at Sahagu in Busan(113persons) and Geojer Si in Kyungnam (102persons). The data for this study were collected by direct interviewing method from May 30 th to June 30 th and September 12 th, 2005. Cushing & Sheiham's Sociodental Scale which measures oral health related quality of life was used for this study. The data were analysed by a computerized program named statistical package for social science including frequency, percentage, t-test. The results of this study were summarized as follows; 1. Mean score of the oral health related quality of life in elders is $2.42{\pm}1.03$ 2. There was a significant difference in oral health related quality of life in elders between the age 60 ~ 70 years group and the over than 71 years group(P < 0.01). 3. There was a significant difference in oral health related quality of life in elders between the urban and rural group(P < 0.05). Above findings suggest that further study about proper program for geriatric oral health evaluation is necessary in improving the oral health related quality of life in elders.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.19 no.2
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• pp.191-199
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• 1997

Mandibular trauma is developed due to traffic accident, fall down, industrial injury, and others. TMJ disorder is usually also developed after facial traumatic injury. Many authors suggested that disc displacement or tearing, acute synovitis, TMJ ankylosis, traumatic arthritis, or effusion are developed after facial trauma. It is still very controversible what is the best treatment of TMJ injury such as condylar fracture and meniscal injury. In TMJ injury, synovial inflammation is developed and pain mediators such as prostaglandin E2 or leukotriene B4 are released from the synovial membrane. This can be a cause of TMJ disorder. I present a variety of experimental study about the condylar fracture and meniscal injury and enzyme-immunoassay of synovial fluid after mandibular trauma that have been studied since 1992 and establish the treatment criteria of traumatic TMJ injury. I think that the treatment option of condylar fracture depends upon the surgeon's criteria exclusively. There are no significant differences between conservative and surgical treatment. If the aggressive functional physical therapy and long-term followup be performed, the favorable functional recovery of TMJ can be obtained. And I think that the initial surgical management of meniscus of TMJ is unnecessary in condylar fracture. And also arthrocentesis can be available to release the patient's subjective symptoms and improve the healing of injured TMJ.