• 대한소아치과학회지
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• 제30권3호
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• pp.363-372
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• 2003

임상에서 흔히 발견되는 과잉치는 치아 형성기에 발생할 수 있는 치아 발육 이상의 하나로 여러 가지 치과적 합병증을 야기한다. 특히 상악 정중부에 역위 매복된 과잉치는 발생률이 높고 인접치에 미치는 영향이 크다는 점에서 임상적으로 중요하다. 과잉치에 대해서 임상적 및 방사선학적으로 보고되고 있으나 대부분의 연구는 표본 수가 적었으며 구내 방사선 사진이나 파노라마 방사선 사진만으로 검사하여 과잉치의 형태 및 위치 그리고 주위 조직에 미치는 영향 등에 관하여 정확하게 평가하기 어려웠을 것으로 생각된다. 이에 저자는 상악 정중부 역위 매복 과잉치의 개수, 형태, 만곡도, 위치, 근접도 및 합병증을 삼차원적으로 평가하기 위하여 1998년 7월부터 2002년 6월까지 연세대학교 치과대학병원 소아치과에 내원한 환자중 상악 정중부 역위 매복 과잉치의 진단을 위하여 전산화 단층 방사선사진 촬영을 한 경우에 대해 임상 기록지, 파노라마 방사선사진과 전산화 단층 방사선사진을 이용하여 다음과 같은 결과를 얻었다. 1. 상악 정중부 역위 매복 과잉치는 3.4:1로 여자보다 남자에서 호발하였다. 2. 과잉치는 1개 있는 경우가 가장 많았고 2, 3개 순으로 관찰되었으며, 평균 1.3개였고, 6-8세에 많이 발견되었다. 3. Conical 형태의 과잉치가 80.6%로 가장 많았고, tuberculate, supplemental 형태 순으로 나타났다. 4. 과잉치가 tuberculate 형태일 경우, 치근이 만곡되었을 경우와 인접치와 근접도가 높을 경우 합병증이 더 높게 발생하였다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제27권5호
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• pp.428-434
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• 2001

After miniplate fixation of mandibular angle fractures, fracture line stability during functional loading was evaluated. Using panoramic radiographs, 15 mandibular angle fracture patients who were treated by open reduction and one miniplate fixation along the external oblique ridge, were evaluated at postoperative 1, 4 and 8 weeks. At each time, 2 radiographs were taken: one taken during maximum biting of hardened silicone sheet on the affected side molar area and the other on the non-affected side. The distraction gap of inferior border of mandible at each time and each side was measured and these data were analysed statistically with clinical findings. The differences of inferior border distraction gap during hardened silicone sheet biting on the affected side molar area and on the non-affected side molar area at 4 week radiographs were smaller than those of 1 week's except one case. At 8 week's radiographs, the fracture lines were so stabilized that it was almost impossible to find the gap differences except one case and there were increased radiopacity along the entire fracture lines. Clinically, bony union was confirmed in all cases during plate removal performed at postoperative 6 month. By statistical analysis(paired t-test), the inferior border distraction gap during biting of hardened silicone sheet on the affected side was significantly reduced during 1 and 4 week interval(p<0.01). The differences of inferior border distraction gap during biting on the affected side molar area and on the non-affected side molar area were also significantly reduced at 1 and 4 week interval(p<0.01). But the inferior border distraction(compression) gap during non-affected side biting was not significantly changed. From these findings, it could be concluded that fracture line stability during functional loading after one miniplate fixation of mandibular angle fractures stems mainly from reduction of inferior border distraction gap during affected side biting on time interval. According to these radiographic and clinical findings, the clinical superiority of one miniplate fixation technique in mandibular angle fracture treatment could be confirmed.

• Journal of Oral Medicine and Pain
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• 제26권1호
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• pp.75-85
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• 2001

This study was performed to investigate the effect of mandibular midline shift and difference of mandibular height between both sides on the electromyo- graphic(EMG) activity of the masticatory muscles on clenching or gum chewing movement. For this study, 105 patients with temporomandibular disorders(TMD) were selected and panoramic radiograph were taken. Amount and side of the midline shift and height of the mandible from antegonial notch to the top of the condylar head were measured on panoramic view. $BioEMG^{(R)}$ (Bioresearch Inc., Milwaukee, USA) was used for recording of EMG activity(${\mu}V$) of the anterior temporalis and the superficial masseter on clenching or gum chewing movement. EMG activity on clenching during 533msec period were measured for activity of the starting point and the one second-after activity as the early EMG and the maximum EMG, respectively. EMG activity on gum chewing movement were measured for activity of the first and the second chewing stroke. The data collected were analysed by SPSS windows program, and the results of this study were as follows : 1. Height of the mandible was 8.06cm on right side and 8.03cm on left side, and showed no difference by age, but significantly differed by sex with higher in male subjects. 2. Mean value of the midline shift was 0.1mm with range of 0~5mm on both sides. The amount and side of the midline shift did not related with height difference of the mandible and/or the EMG activity of the masticatory muscles on clenching. 3. Prevalence of higher right side and higher left side of the mandible were almost same, and the EMG activity of higher side was not higher than that of the other side. 4. In the subjects with height difference of more than 5mm between both sides of the mandible, the early EMG activity on clenching were differed for the anterior temporalis, but the maximum activity were differed for the superficial masseter. 5. In the subjects with height difference of more than 5mm between both sides of the mandible, EMG activity of the anterior temporalis of the gum chewing side was not higher than that of the other side when chewing on the side of lower height, but in the subjects with height difference of less than 5mm, the EMG activity was higher than that of the other side.

• 대한소아치과학회지
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• 제27권4호
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• pp.535-539
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• 2000

구강 내에서 치아가 이소맹출되는 것은 흔히 있는 반면에 구강외 다른 부위로의 이소맹출은 드물다. 예를 들어 비강, 턱, 하악과두, 관상돌기, 안와 또는 상악동으로 이소맹출할 수 있으며 그 원인은 불명확한데 구개열과 같은 발육장애, 외상이나 낭종에 의한 치아변위, 상악감염, 유전, 총생 또는 치밀골 등의 원인 요소가 논의되고 있지만 대부분의 증례에서 정확한 원인이 규명되지는 않았다. 치아가 상악동으로 이소맹출한 경우 무증상일 수 있지만 심각한 병적문제를 야기할 수 있다. 본 증례는 6세 1개월 남환아로 어금니가 아프다는 주소로 연세대학교 치과대학병원 소아치과에 내원하였다. 의과병력과 치과병력조사에서 특이한 사항은 없었고 통상적인 보존치료후 주기적인 임상 및 방사선 사진 검사에서 상악 좌, 우 견치의 맹출경로의 이상소견을 보였다. 13세 7개월에 촬영한 파노라마 방사선 사진에서 상악 좌, 우측 견치가 상악동으로 이소맹출되었으며 Caldwell Luc 수술법으로 제거하였다. 환자는 동통이나 불편감 등을 호소하지 않았으며 종창이나 지각과민 등의 구강내 이상소견은 없었다. 이소맹출되는 치아는 영구치, 유치 및 과잉치일 수 있으며 대부분의 과잉치는 무증상으로 주로 주기적인 방사선 검사시 발견될 수 있다. 정확한 진단 및 치료계획을 세우기 위하여 주기적 인 구강 및 방사선 사진 검사가 필요하다.

• Journal of Oral Medicine and Pain
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• 제25권2호
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• pp.205-214
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• 2000

This study was performed to investigate the relationship between mandibular midline shift and anteroposterior first molar occlusal relation, and their effects on the mandibular height and the occlusal plane angle. For this study, 49 patients with temporomandibular disorders were selected. They did not show facial asymmetry and their facial midline coincide with maxillary dental midline. Upper and lower mandibular impression were taken and the casts were fabricated. Amount and direction of the mandibular midline shift and the anteroposterior shift between the two occluding first molars were measured on the casts. Several items related to height such as mandibular height from top of the articular surface of the condyle to curve changing point between antegonial notch and mandibular angle, condylar height which was the vertical distance from the articular surface to retroepicondyle of the condyle, and sigmoid height from the deepest point of sigmoid notch to the curve changing point and the occlusal plane angle were also measured on the panoramic and on the transcranial radiographs. Correlation between midline shift and anteroposterior first molar relation and comparison between right and left mandibular height by the midline shift and the first molar relation were analysed by SPSS windows program. The results of this study were as follows : 1. Mean amount of midline shift in the subjects with midline shift were 2.0mm for both side, respectively. The first molar relation of the ipsilateral side of midline shift showed Angle class II tendency and the contralateral side showed Angle class III tendency, which meant drift of the dentition to the side of the midline shift. 2. The occlusal plane angle on the panoramic radiograph were $13.0^{\circ}$ in right, and $12.5^{\circ}$ in left side, and their were no correlation between occlusal plane angle and mandibular midline shift and the first molar occlusal relation. 3. Angle's classification for both sides of the first molar relation were same in about half of all the subjects. Amount of deviation from class I first molar relation, however, were decreased in the contralateral side of observed side. 4. Mandibular height of the ipsilateral side to which mandibular midline shift showed tendency of lower than that of the contralateral side, and there was a tendency that the height was higher in class III subjects, then class II subjects, and lower in class I subjects. However, condylar height did not show any difference in the subjects with midline shift and also show no difference by the first molar occlusal relation.

• 대한소아치과학회지
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• 제48권4호
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• pp.476-483
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• 2021

외상성 골낭은 임상 증상이 없으며 청소년기에 호발 한다. 주로 정기검진을 위한 파노라마 촬영시에 우연히 발견되며 병소는 비교적 경계가 뚜렷한 단일성의 방사선 투과상으로 가리비 껍질 모양의 변연을 보인다. 조직학적 소견으로 해면골내 공동과 얇고 느슨한 결합조직의 이장이 관찰된다. 상피세포의 이장이 존재하지 않는 것이 주된 조직학적 특징이다. 호발 부위는 하악 견치부와 제3대구치 사이이다. 하악 결합 부위에서는 드물게 나타난다. 외상성 골낭의 발병원인은 아직 명확하지 않다. 외상성 골낭은 외과적 적출술과 소파술로 치료되며 외과적인 처치 후 6 - 12 개월 정도 지나면 새로운 골로 채워진다. 대부분의 케이스에서 치료 전 외상성 골낭으로 진단 내리는 것은 한계가 있다. 따라서 본 증례에서는 방사선학적, 조직학적 검사를 통해 진단 내렸다. 두 환자 모두 외상 관련 병력은 없었다. 외과적 처치 후 파노라마와 CBCT를 이용하여 골성 치유를 확인하였다.

• 대한소아치과학회지
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• 제49권4호
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• pp.402-413
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• 2022

이 연구는 파노라마 방사선 영상과 Cone-Beam Computed Tomography (CBCT)를 이용하여 상악 매복 견치의 견인 치료기간에 영향을 미치는 요인을 알아보고 견인 기간을 예측하고자 하였다. 2012년 1월부터 2020년 12월까지 아주대학교 치과병원에 내원한 환자들 중 상악 견치의 매복으로 진단받아 외과적, 교정적 개입을 통한 견인 치료를 시행 받고 상악 매복 견치의 맹출까지 치료받은 만 8세 이상 만 18세 이하 환자 73명(93개의 상악 매복 견치)의 의무기록지와 방사선학적 영상을 후향적으로 분석하였다. 단계적 다중회귀분석 결과 교합평면에서 상악 매복 견치 교두정까지의 거리, 근-원심과 협-구개 위치, 환자의 나이 그리고 급속구개확장장치의 사용 유무는 견인 치료기간을 예측하는 데 통계적으로 유의미한 요인이었으며, 매복 견치의 치축이 교합평면과 이루는 각과 편측성/양측성 매복 양상은 견인 기간과 유의미한 상관관계를 보였다. 견치의 낮은 매복 깊이, 견치 교두정의 근-원심 위치가 측절치 또는 견치 영역, 협-구개 위치가 협측 또는 중앙에 위치하고, 치료시작 시 환자의 어린 나이 그리고 구개 확장 장치의 사용이 상악 매복 견치의 견인 기간을 짧게 예측하는 데 도움을 줄 수 있을 것이다.

• Imaging Science in Dentistry
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• 제43권3호
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• pp.179-184
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• 2013

Purpose: X-ray exposure should be clinically justified and each exposure should be expected to give patients benefits. Since dental radiographic examination is one of the most frequent radiological procedures, radiation hazard becomes an important public health concern. The purpose of this study was to investigate the attitude of Korean dentists about radiation safety and use of criteria for selecting the frequency and type of radiographic examinations. Materials and Methods: The study included 267 Korean dentists. Five questions related to radiation safety were asked of each of them. These questions were about factors associated with radiation protection of patients and operators including the use of radiographic selection criteria for intraoral radiographic procedures. Results: The frequency of prescription of routine radiographic examination (an example is a panoramic radiograph for screening process for occult disease) was 34.1%, while that of selective radiography was 64.0%. Dentists' discussion of radiation risk and benefit with patients was infrequent. More than half of the operators held the image receptor by themselves during intraoral radiographic examinations. Lead apron/thyroid collars for patient protection were used by fewer than 22% of dental offices. Rectangular collimation was utilized by fewer than 15% of dental offices. Conclusion: The majority of Korean dentists in the study did not practice radiation protection procedures which would be required to minimize exposure to unnecessary radiation for patients and dental professionals. Mandatory continuing professional education in radiation safety and development of Korean radiographic selection criteria is recommended.

• 대한치과의사협회지
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• 제49권4호
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• pp.211-218
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• 2011

Purpose: An impacted tooth is defined as a tooth that shows delayed eruption and is expected to erupt incompletely by clinical and radiograph examination despite it reaching its expected time of eruption. The aims of this study were to investigate the clinical and radiological characteristics and treatment duration and method of impacted teeth in Korean patients. Materials and Methods: For this study we used clinical records, study models, panoramic radiographs and intraoral photographs of patients who attended Gachon University Gil Hospital Orthodontic Department between 2005 and 2008. There were 164 patients with a total number of 202 impacted teeth. Results: Male patients shows a little more prevalence than female patients (1.13:1). The under 12 age group had the highest prevalence of tooth impaction, and the over 19 age group showed the least prevalence of tooth impaction. The ratio of tooth impaction between the left to right ratio was 1.73:1 and maxilla and mandible was 1.84:1. The impacted teeth were most commonly positioned buccally (76 cases, 41.5%). Full nap closure technique (108 cases, 81.2%)was most frequently used for attachment of surgical traction hooks. Maxillary canine impaction was most commonly encountered both in male and female patients. The mean treatment period was 12.2 months and the success rate of treatment was 90.3%. The canine tooth shows the longest treatment time and highest failure rate. The ankylosis was the major cause of failure. Conclusion: Impacted teeth most commonly show in left side maxilla in the under 12 age group. And it is most commonly positioned buccally. The mean treatment period was 12.2 months, and the success rate of treatment was 90.3%.

• Journal of Oral Medicine and Pain
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• 제16권1호
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• pp.121-136
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• 1991

This study was undertaken to obtain the data for age determination following the calcification degree of the second molar, third molar in the point of forensic odontology. The intraoral panoramic radiograph of 1600 male and 1600 female (100 persons each age) ranging from 7 to 2 years of age were studied. The developmental state of the second molar and third molar were divided into 12 stages following the calcification degree and correlations of second molar developmental stage and statistically analyzed. The results were as follows : 1. There was remarkable correlation between the development of the second molar, the third molar and age. 2. There was no significant developmental differences between the right and left second molar, third molar.(p>0.05) 3. The developmental stages of the lower second molar was more advanced than those of upper second molar. (p<0.05) 4. The developmental stages of upper third molar was more advanced than those of lower third molar. (p<0.05) 5. Both the developmental stages of second, third molars were earlier in the female than in the male. (p<0.001) 6. For the purpose of age estimation according to developmental stages of the second, third molar, linear equations are as follows. (p<0.001) second molar : male upper : Y=1.3927X + 0.2213 (r=0.72) lower : Y=1.4132X + 0.0012 (r=0.78) female upper : Y=1.4914X + 0.2151 (r=0.73) lower : Y=1.5429X - 0.0911 (r=0.78)