• 한국임상수의학회지
• /
• 제33권1호
• /
• pp.25-29
• /
• 2016

5-7개월령의 세 마리 말티즈가 전남대학교 동물병원에 IV급 근원심교합으로 내원하였다. 첫 번째 증례의 부정교합은 교정 버튼과 Masel chain을 사용하여 하악 견치를 뒤쪽으로 이동시켜 교정하였다. 두 번째 증례는 교정 버튼과 체인을 이용하여 전방전위된 견치를 교정하였다. 하악 견치가 후방으로 이동이 완료된 후 상악에 finger spring과 함께 arch wire를 적용하여 전치를 앞쪽으로 이동시켰다. 세 번째 증례는 버튼과 체인을 이용하여 하악 견치를 후방으로 이동시킨 후 상악에 finger spring과 함께 arch wire를 적용하여 전치를 앞쪽으로 이동시켰다. 또한 하악 견치에 부착시킨 버튼에 elastic band를 장착하여 하악 전치를 후방으로 이동시켰다. 결과적으로 모든 환자에서 성공적으로 정상적 교합을 재건할 수 있었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제35권4호
• /
• pp.221-228
• /
• 2009

The purpose of the study was to investigate the characteristics of the pronunciation of Korean vowels in patients with class III malocclusion. 11 adult male patients with class III malocclusion(mean ages 22.3 years) and four adult males with normal occlusion(mean ages 26.5 years) were selected for the analysis of eight Korean monophthongs /ㅣ, ㅔ, ㅐ, ㅏ, ㅓ, ㅗ, ㅡ, ㅜ/. The values and relationships of F1, F2 and F3 were derived from the stable section of target vowel in each sentence, and the analysis using formant plots and vowel triangles' distance and area was conducted to find the features of two groups' vowel distributions. Consequently, it was identified that the pronunciation of males patients with class III malocclusion showed high values of F1 in the low vowels, high values of F2 in the back vowels, and remarkably low position of /ㅏ/. The vowel triangle suggested that the triangle areas of male patients with class III malocclusion were shown wider vertically and narrower horizontally than those of males with normal occlusion. These characteristics could reflect the structural features of class III malocclusion such as the prognathic mandible, low tongue position, and advancement of back position of the tongue.

• 구강회복응용과학지
• /
• 제28권1호
• /
• pp.79-86
• /
• 2012

심한 치열 총생이나 입술이 돌출된 환자들에서 대다수의 경우에 발치 교정치료를 시행한다. 이런 경우 많은 수의 환자들에서 교정치료 완료 후 발치된 공간이 폐쇄되었음에도 해당 발치 공간 부위에 치은이 주름을 형성하는 치은 함입(gingival invagination)이 관찰된다. 이런 경우 폐쇄된 공간의 재발 및 국소적 치주 문제가 발생할 가능성이 있기에 치은 함입부에 대한 치주과적 처치가 필요하다. 본 증례의 환자는 치아가 맞지 않는다고 내원한 16세 여자 환자였으며 몇 년 전에 지역 치과에서 상악 소구치의 발치가 시행되었던 환자였기에 하악 소구치 발치를 동반한 교정치료를 시행하였다. 자연스럽게 폐쇄되었던 상악 소구치부와는 다르게 교정치료 완료 후 하악 소구치부위에서는 치은 함입이 관찰되어 치주과적으로 치은 함입부위를 절제하여 치은 평탄화를 시켰다. 치은 평탄화 작업은 레이저를 이용하여 좌측은 1회, 우측은 2회에 걸쳐서 시행하였으며 안정된 결과를 나타내었다. 이상의 치료를 통하여 발치를 동반한 교정치료 환자에서 발생하기 쉬운 치은 함입부의 치은 평탄화를 이룬 증례를 보고하고자 한다.

• 대한치과교정학회지
• /
• 제48권3호
• /
• pp.189-199
• /
• 2018

For patients with bimaxillary protrusion, significant retraction and intrusion of the anterior teeth are sometimes essential to improve the facial profile. However, severe root resorption of the maxillary incisors occasionally occurs after treatment because of various factors. For instance, it has been reported that approximation or invasion of the incisive canal by the anterior tooth roots during retraction may cause apical root damage. Thus, determination of the position of the maxillary incisors is key for orthodontic diagnosis and treatment planning in such cases. Cone-beam computed tomography (CBCT) may be useful for simulating the post-treatment position of the maxillary incisors and surrounding structures in order to ensure safe teeth movement. Here, we present a case of Class II malocclusion with bimaxillary protrusion, wherein apical root damage due to treatment was minimized by pretreatment evaluation of the anatomical structures and simulation of the maxillary central incisor movement using CBCT. Considerable retraction and intrusion of the maxillary incisors, which resulted in a significant improvement in the facial profile and smile, were achieved without severe root resorption. Our findings suggest that CBCT-based diagnosis and treatment simulation may facilitate safe and dynamic orthodontic tooth movement, particularly in patients requiring maximum anterior tooth retraction.

• 대한치과교정학회지
• /
• 제46권5호
• /
• pp.269-279
• /
• 2016

Objective: Rapid maxillary expansion (RME) is used to expand the maxilla and increase arch perimeter; yet, there are few reports on its effects on the sphenoid bone. With cone-beam computed topography (CBCT), it is possible to visualize sphenoid bone changes. The purpose of this study was to investigate sphenoid bone changes observed in conjunction with RME treatments, using CBCT. Methods: Sixty patients (34 women and 26 men, aged 11-17 years) underwent RME as part of their orthodontic treatment. Patients were randomly assigned to one of three groups: a tooth-anchored group, a bone-anchored group, or a control group. Initial CBCT scans were performed preceding the RME treatment ($T_1$) and again directly after the completion of expansion ($T_2$). Statistical analysis included ANOVA, descriptive statistics, and the intraclass correlation coefficient (ICC). Results: The reliability of the landmark location was at least 0.783, and the largest ICC mean measurement error was 2.32 mm. With regard to distances, the largest change was 0.78 mm, which was not statistically significant (p > 0.05). Statistical significance was established in patient groups of the same sex and treatment type for the following distance measurements: right anterior lateral pterygoid plate to the right edge of the hypophyseal fossa ($d_2$), anterior distance between the medial pterygoid plates ($d_4$), and anterior distance between the left medial and lateral plates ($d_8$). Conclusions: In this study, there were no clinically significant changes in the sphenoid bone due to RME treatments regardless of sex or treatment type.

• 대한치과교정학회지
• /
• 제50권3호
• /
• pp.216-226
• /
• 2020

Root resorption can be caused by several factors, including contact with the cortical bone. Here we report a case involving a 21-year-old female with Angle Class II, division 1 malocclusion who exhibited significant root resorption in the maxillary right central incisor after orthodontic treatment. The patient presented with significant left-sided deviation of the maxillary incisors due to lingual dislocation of the left lateral incisor and a Class II molar relationship. Cephalometric analysis demonstrated a Class I skeletal relationship (A point-nasion-B point, 2.5°) and proclined maxillary anterior teeth (upper incisor to sella-nasion plane angle, 113.4°). The primary treatment objectives were the achievement of stable occlusion with midline agreement between the maxillary and mandibular dentitions and appropriate maxillary anterior tooth axes and molar relationship. A panoramic radiograph obtained after active treatment showed significant root resorption in the maxillary right central incisor; therefore, we performed cone-beam computed tomography, which confirmed root resorption along the cortical bone around the incisive canal. The findings from this case, where different degrees of root resorption were observed despite comparable degrees of orthodontic movement in the bilateral maxillary central incisors, suggest that the incisive canal could be an inducing factor for root resorption. However, further investigation is necessary to confirm this assumption.

• Imaging Science in Dentistry
• /
• 제39권3호
• /
• pp.157-161
• /
• 2009

Purpose : This study aimed to investigate the luminal stenosis of the internal carotid artery with calcification detected on panoramic radiographs. Materials and Methods : This study used fifty carotid arteries of 36 dental patients whose panoramic radiograph and computed tomography angiography (CTA) revealed the presence of carotid artery calcification. A neuroradiologist interpreted CTA to determine the degree of stenosis of the internal carotid arteries. The degree of stenosis was stratified in four stages; normal (no stenosis), mild stenosis (1-49%), moderate stenosis (50-69%) and severe stenosis (70-99%). Results : Among the fifty carotid arteries with calcification detected on both panoramic radiography and CTA, 20 carotid arteries (40%) were normal, 29 carotid arteries (18%) had mild stenosis, 1 carotid artery (2%) had moderate stenosis, and there was none with severe stenosis. Conclusion : Sixty percent of the carotid arteries with calcification detected on both panoramic radiography and CTA had internal luminal stenosis, and two percent had moderate stenosis. When carotid atheroma is detected on panoramic radiograph, it is possible that the dental patient has luminal stenosis of the internal carotid artery.

• Maxillofacial Plastic and Reconstructive Surgery
• /
• 제29권1호
• /
• pp.24-32
• /
• 2007

The odontogenic keratocyst(OKC) is a common developmental odontogenic cyst and represents approximately 11% of odontogenic cysts. It is decided by microscopic and histopathologic determinant rather than by clinical appearance. In this study, expression of RANKL and OPG in OKC in relation to age and gender of patient and recurrence, location of lesion were examined through immuno- histochemical study. The RANKL and OPG antibody staining were used. The obtained result were as follow. 1. Positive immunoreactivity to RANKL/OPG in all specimens was found. 2. There was no significant difference in immunohistochemical expression of RANKL relating to recurrence, location of OKCs and age, gender of patients. 3. There was no significant difference in immunohistochemical expression of OPG relating to recurrence, location of OKCs and age, gender of patients. From above results, it is suggested that activation of osteoclasts by RANKL is an important mechanism by which OKCs cause bone destruction.

• 대한구순구개열학회지
• /
• 제4권2호
• /
• pp.9-18
• /
• 2001

구순구개열은 악안면 영역의 선천기형 중 발생빈도가 가장 높으며 출생시부터 성장완료 시기까지 일관된 치료계획에 의한 종합적 진료체계가 필수적이다. 구순구개열의 개선을 위한 구개부 및 입숭? 조기 봉합 후의 반흔조직의 형성은 치열궁 협착 뿐 아니라 상악골 열성장에 의한 중안모의 함몰을 야기하며 이러한 상악골의 열성장 경향은 연령이 증가할수록 점진적으로 증가하는 성향을 보인다. 따라서, 성장잠재력을 이용한 조기의 악정형치료는 구순구개열 환자에서 반드시 필요하며, 적절한 치료 결과를 얻어내기 위하여 환자의 전후방 골격 형태 뿐 아니라, 성장 방향에 대한 고려가 필요하다. 그러나 혼합치열기의 악정형치료는 좋은 결과를 얻었다 하더라도 높은 재발 성향 및 잔여성장에 의한 악골관계의 변화가 예상되므로 장기간의 보정이 필수적이며 성장에 대한 지속적 평가가 이루어져야 할 것이다.

• The Journal of Advanced Prosthodontics
• /
• 제8권1호
• /
• pp.53-61
• /
• 2016

PURPOSE. This study conducted an analysis of cost-effectiveness of the implant and conventional fixed dental prosthesis (CFDP) from a single treatment perspective. MATERIALS AND METHODS. The Markov model for cost-effectiveness analysis of the implant and CFDP was carried out over maximum 50 years. The probabilistic sensitivity analysis was performed by the 10,000 Monte-Carlo simulations, and cost-effectiveness acceptability curves (CEAC) were also presented. The results from meta-analysis studies were used to determine the survival rates and complication rates of the implant and CFDP. Data regarding the cost of each treatment method were collected from University Dental Hospital and Statistics Korea for 2013. Using the results of the patient satisfaction survey study, quality-adjusted prosthesis year (QAPY) of the implant and CFDP strategy was evaluated with annual discount rate. RESULTS. When only the direct cost was considered, implants were more cost-effective when the willingness to pay (WTP) was more than 10,000 won at $10^{th}$ year after the treatment, and more cost-effective regardless of the WTP from $20^{th}$ year after the prosthodontic treatment. When the indirect cost was added to the direct cost, implants were more cost-effective only when the WTP was more than 75,000 won at the $10^{th}$ year after the prosthodontic treatment, more than 35,000 won at the $20^{th}$ year after prosthodontic treatment. CONCLUSION. The CFDP was more cost-effective unless the WTP was more than 75,000 won at the $10^{th}$ year after prosthodontic treatment. But the cost-effectivenss tendency changed from CFDP to implant as time passed.