• 대한치과교정학회지
• /
• 제42권1호
• /
• pp.23-31
• /
• 2012

Objective: The purpose of this study was to determine the soft tissue thickness of male and female orthodontic patients with different skeletal malocclusions. Methods: Soft tissue thickness measurements were made on lateral cephalometric radiographs of 180 healthy orthodontic patients with different skeletal malocclusions (Class I: 60 subjects, Class II: 60 subjects, Class III: 60 subjects). Ten measurements were analyzed. For statistical evaluation, one-way ANOVA and Kruskal-Wallis tests were performed. Least significant difference (LSD) and Dunnet T3 post hoc tests were used to determine the individual differences. Results: Soft tissue thicknesses were found to be greater for men than for women. Statistically significant differences among the skeletal groups were found in both men and women at the following sites: labrale superius, stomion, and labrale inferius. The thickness at the labrale superius and stomion points in each skeletal type was the greatest in Class III for both men and women. On the other hand, at the labrale inferius point, for both men and women, soft tissue depth was the least in Class III and the greatest in Class II. Conclusions: Soft tissue thickness differences among skeletal malocclusions were observed at the labrale superius, stomion, and labrale inferius sites for both men and women.

• 대한치과교정학회지
• /
• 제18권1호
• /
• pp.175-188
• /
• 1988

The purposes of the present study were to describe the vortical and anteroposterior facial dysplasia, and to identify morphologic differences associated with various facial patterns. Anteroposterior dysplasia was classified by traditional Angle's malocclusion classification and according to vertical relationships based on the SN-MP angle, facial pattern was subclassified to 3 vertical groups in each malocclusion group. Each vertical group composed of 20 samples and total 180 samples aged from 9 to 14 years. The results were as follows; 1. The skeletal differences that lead to disportionate lower facial height in vortical and anteroposterior facial dysplasia were closely related to mandibular morphology. 2. Hyperdivergent group, compared with hypodivergent group, demonstrated decrease of SNA and SNB and linguoversion of maxillary and mandibular central incisors in all malocclusion groups. 3. Irrespective of rotation of the jaws, Wits appraisal was a useful measurement in evaluation of relative anteroposterior relationship of maxilla and mandible. 4. As SN-MP angle increased, anterior facial height, especially lower anterior facial height, demonstrated significant increase and intermaxillary space also tended to increase. 5. The correlation coefficients of SN-MP angle and PTFH/ATFH demonstrated the highest value in all malocclusion groups.

• 대한소아치과학회지
• /
• 제45권3호
• /
• pp.307-313
• /
• 2018

본 연구는 소아에서 상하악의 전후방적인 골격적 위치 관계에 따른 기도의 너비를 평가하고자 하였다. 2015년부터 2017년 8월31일까지 경희대학교 치과병원 소아치과에 내원하여 측모두부방사선사진을 촬영한 소아 중 정상적인 안면골격의 수직적 성장 양상을 보이는 7세부터 11세(평균연령 8.5세) 어린이 74명(남아 36명, 여아 38명)을 A point-Nasion-B point (ANB) 각도에 따라 세 군으로 나누어 측모두부방사선사진 계측을 통해 기도 너비를 비교평가하였다. 중기도너비, 하기도너비 및 기능적교합평면상에서의 기도너비에서 통계적으로 유의한 차이를 보였으며, 큰 ANB각도를 지니는 군이 다른 군보다 기도너비가 더 작은 것으로 나타났다. 따라서 골격성 2급 부정교합을 지닌 소아들이 1급이나 3급 부정교합을 지닌 소아보다 기도너비가 더 작은 것으로 사료된다.

• 대한소아치과학회지
• /
• 제46권1호
• /
• pp.38-47
• /
• 2019

구호흡을 야기하는 가장 흔한 원인은 상기도의 폐쇄이다. 구호흡은 수면호흡장애의 병인론적 원인이 될 수 있으며, 어린이에서 수면호흡장애는 성장장애와 행동학적 문제를 일으킬 수 있다. 이 연구의 목적은 구호흡 어린이에서 수면호흡장애와 상기도와의 관계를 조사하고자 함에 있다. 초진 설문지에서 구호흡이 있다고 응답한 7 - 9세의 20명 남자 어린이를 대상으로 하였다. 편도평가, 구호흡 및 수면호흡장애와 관련된 설문지, 측모두부 방사선사진, 그리고 휴대용 간이수면검사를 시행하였다. 수면호흡장애에 대한 평가로 무호흡-저호흡 지수(apnea-hypopnea index, AHI), 산소불포화 지수(oxygen desaturation index, ODI)와 측모두부 방사선 사진을 통해 측정한 상기도 폭경과의 관계를 평가하였다. 상기도 부위 중 후구개 거리와 후설 거리는 무호흡-저호흡 지수와 산소불포화 지수가 커질수록 좁아지는 경향을 보였다(p = 0.002, p = 0.001). 또한, 편도의 크기와는 유의한 상관관계는 없었지만, 아데노이드 비대율의 경우 무호흡-저호흡 지수가 비정상군이 정상군에 비해 아데노이드가 비대하였다(p = 0.008). 이 연구결과를 통해 구호흡이 상기도에 영향을 미칠 수 있고 이는 수면호흡장애까지 연관될 수 있음을 확인할 수 있었다.

• 대한치과교정학회지
• /
• 제49권5호
• /
• pp.319-325
• /
• 2019

Objective: To evaluate differences in skeletal maturity in relation to vertical facial types and to compare differences in the skeletal maturity of the cervical vertebrae and hand-wrist in females. Methods: This study included 59 females aged 7 to 9 years with skeletal Class I malocclusion. The participants were categorized into three groups (low, normal, and high) according to the mandibular plane angle. Skeletal maturity was measured using skeletal maturity indicators (SMIs) and the Tanner-Whitehouse III (TW3) method on hand-wrist radiographs and by using cervical vertebrae maturation indicators (CVMIs) on lateral cephalometric radiographs. Results: The SMI was higher in the high-angle group than in the low-angle group (p = 0.014). The median TW3 bone age was 11.4 months higher in the high-angle group than in the low-angle group (p = 0.032). There was no significant difference in CVMI among the three groups. Skeletal maturity showed a weakly positive correlation with the mandibular plane angle (SMI, r = 0.391; TW3, r = 0.333; CVMI, r = 0.259). Conclusions: The skeletal maturity of the hand-wrist in females with a high mandibular plane angle was higher than that in females with a low mandibular plane angle. Obtaining additional hand-wrist radiographs may facilitate evaluation of skeletal maturity of females. In females with a high mandibular angle, the time to commence orthodontic treatment may be earlier than that in females with a low mandibular angle.

• 대한치과교정학회지
• /
• 제39권2호
• /
• pp.120-129
• /
• 2009

성장기 환자의 교정 치료에서 바람직한 치료 결과를 얻기 위해서는 성장을 정확하게 예측하는 것이 중요하다. 성장 과정은 개인마다 상당한 차이를 보이기 때문에 성장 평가를 위해서는 연대 연령이 아닌 생리적인 연령을 사용해야 한다. 본 연구의 목적은 사춘기 동안 발육하는 하악 제3대구치에서 치아성숙도를 측정하고 성장 평가 지표로서의 그 가치를 평가하고자 하는 데 있다. 연세대학교 치과대학병원 교정과에 내원한 성장기 여자 환자 270명을 대상으로 제3대구치의 치아 성숙도(Demirjian index), 경추의 골 성숙도(CVMI), 수완부 골 성숙도(SMI), 초경 연령 등을 평가하여 분석하였다. 연구 결과 Demirjian Index와 SMI, CVMI 간의 상관관계에서 SMI와 Demirjian index (r = 0.64), CVMI와 Demirjian index (r = 0.59)는 통계적으로 유의한 양의 상관관계를 보였다 (p < 0.001). 그러나 초경 연령과 Demirjian index간의 상관관계(r = 0.26)는 낮았으며 (p < 0.001), Demirjian index를 통해 평가한 제3대구치의 치아성숙도는 I, II, III급 부정교합 간에 차이가 없는 것으로 나타났다. 그리고 제3대구치 치관이 완성되고 치근이 형성되기 시작하는 Demirjian index I단계 이상이면 SMI 10단계, CVMI 5단계 이상에 속하였다. 하악 제3대구치의 발육단계를 이용한 치아성숙도 평가는 경추 및 수완부 골성숙도와 조합하여 사용한다면 사춘기 성장 평가에 있어 하나의 보조적인 수단으로 활용될 수 있을 것이다.

• 치과방사선
• /
• 제21권2호
• /
• pp.341-351
• /
• 1991

The purpose of this study was to aid in the evaluation of prognosis of temporomandibular joint after open reduction of fractured mandible. The author studied the bony changes (remodelling) of 116 temporomandibular joints and facial asymmetry in 58 patients. Subjects were divided into 4 Groups according to the follow up periods after open reduction of fractured mandible. The bony changes and facial asymmetry were observed on lateral tomograms and cephalometric posteroanterior skull radiograms. The results were as follows: 1. The bony changes of condyles were observed in 56 cases (38 flattening, 14 osteophyte, 3 erosion, 1 sclerosis). Flattening was observed in 32.8% (Group Ⅰ 27.8%, Group Ⅱ 37.5%, Group Ⅲ 35.7%, Group Ⅳ 32.1%). Osteophyte was observed in 12.1% (Group Ⅰ 11.1%, Group Ⅱ 8.3%, Group Ⅲ 7.1%, Group Ⅳ 21.4%). Erosion and sclerosis were observed in 2.6%, 0.9%, respectively. 2. The bony changes of articular fossa were observed in 18 cases (15.5%). Flattening was observed in 12.1% (Group Ⅰ 2.8%, Group Ⅱ 4.2%, Group Ⅲ 10.7%, Group Ⅳ 17.9%). Sclerosis was observed in 3.4% (Group Ⅰ 5.6%, Group Ⅲ 3.6%, Group Ⅳ 3.6%). 3. The amount of facial asymmetry was 2.81±2.20㎜ (Group Ⅰ 3.06±1.93㎜, Group Ⅱ 2.38±2.44㎜, Group Ⅲ 2.74±1.19㎜, Group Ⅳ 2.93±2.93㎜). There was no significant difference between all groups according to bony changes of temporomandibular joints after open reduction of fractured mandibles (x²-Test, P>0.05).

• Maxillofacial Plastic and Reconstructive Surgery
• /
• 제28권3호
• /
• pp.222-228
• /
• 2006

Various methods have been used in the past to indirectly analyze the craniofacial region. Among these, the lateral and posterior-anterior cephalometircs are used for the evaluation of the dentofacial deformities. However, cephalometircs create inaccuracies because of the inherent enlargement and distortion of the image. The interpretation of cephalometric films is also problematic: the number of anatomic landmarks that can be identified accurately is limited, and the overlap of structures on a radiograph making locating these landmarks difficult. To overcome these problems, computed tomography(CT) has been recommended as an useful modality in the diagnosis, surgical planning, and follow-up of craniofacial anomalies. There is no significant enlargement or distortion of the image, overlap of structure, or tracing error. And the number of anatomic landmarks is vast. The purpose of this study was to examine the orbit and midfacial region using Occlusal Maxillary CT, consisted of slices parallel to the occlusal plane. Based on these CT scan, we provide the data that could be applied to monitor an individual patient's skeletal pattern and the guide to the maxillary osteotomy.

• Journal of Oral Medicine and Pain
• /
• 제23권2호
• /
• pp.127-141
• /
• 1998

This study was performed to investigate the clinical features of internal derangement of temporomandibular joint. For this study, 117 patients with temporomandibular disorders and 81 dental students without any signs and symptoms of temporomandibular disorders were selected as the patients group and as the control group, respectively. Preferred chewing side, Angle's classification, lateral guidance pattern, maximal mouth opening range, and affected side were recorded clinically. Head and shouldeer posture was measured in a groundplate on which square diagram of five centimeters each had been drawn, and cephalograph was also taken for measurement of head and neck posture. Sonopak of Biopak system (Bioresearch inc., USA) was used to record joint vibration for evaluation of internal healthy status of temporomandibular joint. The data collected were analyzed by SAS statistical program. The results of this study were as follows : 1. Frequency of left side chewing subjects was higher in patients than in control group, but there was no difference in distribution of subjects by Angle's classification. Other types was prvalent in patients whereas group function was more in control group for lateral guidance pattern. 2. As to lateral guidance pattern by clinical diagnosis, patients with internal derangement and/or degenerative joint disease showed higher frequency was consistent with the result by Sonopak impression. 3. There was no difference for shoulder height between the two groups, however, tilting of head and backward extension of cervical spine was more frequent in control group. 4. Acromion was positioned more anteriorly in patients with internal derangement and/or degenerative joint disease than in control group and angle between eye and tragus was larger in patients. Patients with degenerative joint disease showed more flexed head posture than control group did in cephalometric profile. 5. Maximal mouth opening range in patients with internal derangement was the least in all subgroups in patients classified by Sonopak impression.

• Journal of Oral Medicine and Pain
• /
• 제22권2호
• /
• pp.383-394
• /
• 1997

The purpose of this study was to examine the anatomic changes in the upper airway with a dental orthosis. the effectiveness and side effects of orthosis in the treatment of snoring and obstructive sleep apnea. To meet this puppose a dental orthosis, designed to increase the size of the upper airway by advancing the mandible, was used in 42 patients (30 M, 12 F), aged 29 - 69 years, to treat snoring and varying decrees of obstructive sleep apnea. Cephalometric study of anatomic featured was made with and without a dental orthosis, and the evaluation of the effectiveness and side effects of orthosis was done by questionnaires. The obtained results were as follows : 1. All subjects were habitual snorers and 32 patients comp1ained the loudness of snoring as severe as be heard outside of the patient's room. 2. According to the degree of respiratory distirbance index(RDI) and aprea index(Al) from the polysomnograph in 34 patient, mild obstructive sleep apnea patients were 5, moderate 6 and severe 16. 3. Various anatomic changes in the upper airway with denta1 orthosis were as follows : (1) More superioly positioned hyoid bone ( p<0.001) (2) Enlarged oropharyngeal (superior p<0.01, middle p<0.01. inferior p<0.01) and hypopharyngeal (P<0.05) airway space. 4. According to the results of the changes of clinical syptoms after the usage of the dental orthosis acquired from questionnaires, there was significant improvement in the frequently, the loudness and the severity of snoring, cessation of breathing and awakening from the difficulty of breathing during sleep. 5. The effectiveness and side effects of dental orthosis by questionnaires were as follows ; (1) Dental orthosis satisfied almost all the patients (68±20%). (2) Snoring was improved in all the patients (73±19%). (3) Obstructive sleep aphea was improved in all the patients (61 ± 37%) (4) Sleepiness in the daytime was significantly improved (61 ±37%). (5) The sleep quality was significantly improved (61±37%). (6) The discomfort of the dental orthosis was minor (33±18%) and no serious complications were observed. 6. The dental orthosis is an effective treatment for the symptom of snoring, and it can also effectively treat varying degrees of obstructive sleep apnea.