• 대한치과교정학회지
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• 제31권4호
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• pp.439-445
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• 2001

본 연구의 목적은 기능성 및 골격성 전치부 반대교합 환자에 대한 형태학적 차이점을 비교하는 것이다. 전치부의 기능성 반대교합을 보이는 28증례와 골격성 반대교합을 보이는 31증례를 각각 실험군과 대조군으로 삼았다. 실험군과 대조군의 평균연령은 $9.6{\pm}1.8$세와$9.9{\pm}1.9$세이었다. 측모두부방사선 사진을 촬영하였으며 두 군간의 형태학적 차이를 비교하기 위해 49개 항목에 대한 계측 및 통계학적인 분석을 시행하였다. 계측항목 중 cranial deflection, maxillary depth, ANB, convexity, NPo-AB, APDI, Mx 1-SN, Mx 1-NA angle, Mx 1-NA, Md 1-NB angle and Md 1-NB에서 통계학적인 유의차가 나타났다. 실험군에서는 Class III로의 성장 가능성, 상악골의 전방위치, 상하악골간의 전후방적 부조화 감소, 상악 중절치의 후퇴, 직립 및 하악 중절치의 전돌, 순측경사를 보였다.

• The Journal of Advanced Prosthodontics
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• 제14권3호
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• pp.150-161
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• 2022

PURPOSE. The purpose of the study was to assess the influence of build orientations and density of support structures on the trueness of the 3D printed removable partial denture (RPD) frameworks. MATERIALS AND METHODS. A maxillary Kennedy class III and mandibular class I casts were 3D scanned and used to design and produce two 3D virtual models of RPD frameworks. Using digital light processing (DLP) 3D printing, 47 RPD frameworks were fabricated at 3 different build orientations (100, 135 and 150-degree angles) and 2 support structure densities. All frameworks were scanned and 3D compared to the original virtual RPD models by metrology software to check 3D deviations quantitatively and qualitatively. The accuracy data were statistically analyzed using one-way ANOVA for build orientation comparison and independent sample t-test for structure density comparison at (α = .05). Points study analysis targeting RPD components and representative color maps were also studied. RESULTS. The build orientation of 135-degree angle of the maxillary frameworks showed the lowest deviation at the clasp arms of tooth 26 of the 135-degree angle group. The mandibular frameworks with 150-degree angle build orientation showed the least deviation at the rest on tooth 44 and the arm of the I-bar clasp of tooth 45. No significant difference was seen between different support structure densities. CONCLUSION. Build orientation had an influence on the accuracy of the frameworks, especially at a 135-degree angle of maxillary design and 150-degree of mandibular design. The difference in the support's density structure revealed no considerable effect on the accuracy.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권2호
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• pp.129-137
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• 2006

The treatment plan for orthognathic surgery must be based on accurate predictions, and this can be produced the most esthetic, functional and stable results. The purpose of this study was aimed to evaluate the amount and interrelationship of the gonial angle and the mandibular width change after the mandibular setback surgery in the mandibular prognathic patients. Twenty patients were selected who received orthognathic surgery after presurgical orthodontic treatment. The patients with skeletal and dental Class III malocclusion were operated upon with bilateral sagittal split ramus osteotomy and mandibular setback. The lateral and posteroanterior cephalometric radiographs were taken preoperatively, postoperative 1 day and 12 months later after the orthognathic surgery, and then the gonial angle and mandibular width were measured. The computerized statistical analysis was carried out with SPSS/PC program. The gonial angle at postoperative 1 day was decreased about $5.3^{\circ}$ than preoperative value and the gonial angle at postoperative 12 months was increased about $1.4^{\circ}$ than postoperative 1 day. So the gonial angle at postoperative 12 months was decreased about $3.9^{\circ}$ than preoperative value. The mean preoperative gonial angle was $125.35^{\circ}{\pm}7.36$, showing significantly high value than normal and mean gonial angle at postoperative 12 months was $121.45^{\circ}{\pm}6.81$, showing value near to normal. The mandibular width at postoperative 1 day was decreased about 1.1 mm than preoperative value and the mandibular width at postoperative 12 months was more decreased about 1.7 mm than postoperative 1 day. So the mandibular width at postoperative 12 months was decreased about 2.8 mm than preoperative value. These results indicate that sagittal split ramus osteotomy in mandibular prognathic patients with high gonial angle is effective to improvement of gonial angle. It is considered to be helpful for maintenance of postoperative stable gonial angle area that detailed postoperative care and follow-up.

• 대한치과교정학회지
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• 제49권5호
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• pp.319-325
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• 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
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• 제22권1호
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• pp.253-271
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• 1992

The purpose of this study was to investigate the difference of EMG activity of the Orbicularis oris and Mentalis muscle between normal occlusion and class III malocclusion group during various lip position and to find out whether any correlations exist between the muscular activity and craniofacial morphology. In this study, 50 subjects with a mean age of 22.9 Years (range 20.0-26.0) were investigated (25 subjects were normal occlusion, and 25 subjects were class III malocclusion). EMG data were recorded from the Orbicularis oris and Mentalis muscle during rest lip posture, lip position at maximum biting, lip position at maximum sealing effort, lip position at chewing, swallowing and phonation with the Medelec MS-25 electromyographic machine. Lateral cephalometric radiographs was taken with the mandible in intercuspal position on all subjects. All data were recorded and statistically processed. The findings of this study can be summerized as follows: 1. In normal occlusion, the maximal mean amplitude of upper lip during the lip position at chewing was lower than that of lower lip and mentalis muscle. But the maximal mean amplitude of orbicularis oris and mentalis muscle during the other lip position was not statistically different. 2. In Class III malocclusion, the maximal mean amplitude of upper lip during the lip position at chewing, swallowing and phonation was lower than that of lower lip and mentalis muscle. But the maximal mean amplitude of orbicularis oris and mentalis muscle during the other lip position was not statistically different. 3. Compare to normal occlusion, the Class III malocclusion was showed low maximal mean amplitude of upper lip during rest lip posture and the lip position at swallowing of saliva, and showed great maximal mean amplitude of lower lip and meantalis muscle during the lip position at chewing and phonation. 4. In normal occlusion, the maximal mean amplitude of upper lip during various lip position was not correlated with the length and thickness of upper lip, but the maximal mean amplitude of lower lip during the lip position at chewing and swallowing was positively correlated with the thickness of lower lip. 5. In Class III malocclusion, the maximal mean amplitude of upper lip during rest lip posture was negatively correlated with the thickness of upper lip, and the maximal mean amplitude of lower lip and mentalis muscle during the lip position at chewing and swallowing was positively correlated with the thickness of lower lip and mentalis muscle. But the maximal mean amplitude of orbicularis oris and mentalis muscle during the other lip position was not correlated with the cephalometric measurements of soft tissue. 6. The correlation between the maximal mean amplitude of orbicularis oris and mentalis muscle and cephalometric measurements of incisors was not nearly present. 7. In normal occlusion, the maximal mean amplitude of lower lip and mentalis muscle during the lip position at maximum biting was negatively correlated with the angle between palatal plane and mandibular plane. In Class III malocclusion, the maximal mean amplitude of upper lip, lower lip and mentalis muscle during function was negatively correlated with the length of maxilla, the maximal mean amplitude of upper lip and lower lip during function was negatively correlated with the SNA and SNPo, and the maximal mean amplitude of lower lip during the lip position at chewing was negatively correlated with the ANB.

• 대한치과교정학회지
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• 제38권1호
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• pp.41-51
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• 2008

III급 부정교합의 악교정수술을 통한 치료 시 하악 후퇴술만을 시행하는 경우와 하악 후퇴술에 전진 이부성형술이 추가로 시행되는 경우에 있어 초진 시 측모 두부 방사선사진상의 특성차이에 대하여 알아보고자 하였다. 구올담치 과병원 구강외과에서 III급 부정교합을 하악후퇴술을 통하여 치료한 33명을 대상으로 하여 하악 후퇴술만을 시행한 21명과 하악 후퇴술과 전진 이부성형술을 시행한 12명으로 나누어 초진 측모 두부 방사선사진상의 차이를 알아보았다. 그 결과 B군에서 N-Me, ANS-Me이 더 길었으며 교합평면의 각도가 더 컸다. 구개평면에서 상악중절치까지의 거리, 하악평면에서 하악 절치 및 제1대구치까지의 거리가 B군에서 더 길었으며, 상악 중절치는 더 설측경사를 보였다. B군에서 Sn-Stms는 더 길고 연조직 Pog은 덜 돌출되어 있었다. 본 연구의 결과에 따라 III급 부정교합 환자에서 하악 후퇴술과 더불어 전진 이부성형술이 시행될지 여부를 예측하는데 초진 측모 두부 방사선사진상의 위 계측항목을 이용할 수 있을 것이다. 수술전 발치교정을 시행한 경우가 있다는 것과 외과의의 심미안, 해부학적 구조등이 이부성형술에 영향을 미쳤을 수 있다는 것은 본 연구의 한계로 생각된다.

• 대한치과교정학회지
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• 제38권4호
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• pp.283-298
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• 2008

본 연구는 악교정수술을 받은 골격성 III급 부정교합자의 치료 전, 후의 하악치열궁 변화를 관찰하고, 이들이 초진 시의 측모두부방사선 규격사진 및 석고모형과 어떠한 상관성을 가지고 있는지를 알아보기 위해 골격성 III급 부정교합자로 진단받은 31명(남자 14명, 여자 17명, 평균 $21.8\;{\pm}\;3.3$세)을 대상으로 치료 전, 악교정수술 전, 악교정수술 후 채득한 측모두부방사선 규격사진과 치료 전, 후의 석고모형을 계측하여 상관분석과 회귀분석을 시행하였다. 연구 결과 Mn-LMMC, Mn-LIE, Mn-MnOcc는 술전교정치료에 의한 유의한 차이를 보이지 않았다. 치료 전의 계측치와 치료 후 변화된 계측치와의 상관관계에서는 치열궁공간부족(ALD)은 ICW, IPW1의 변화량과 순상관관계(r = 0.492, 0.615)를 보였으며, 치열궁장경(arch length)의 변화량과도 순상관관계(r = 0.641)를 보였다. 그러나 Spee 만곡은 전치부치축 각도 변화와 치열궁 폭경 및 장경 등 각각의 변화량과는 상관관계를 보이지 않았다. 이를 이용하여 회귀분석을 시행한 결과, 술전교정 후 Arch length, IPW1의 변화량은 치료 전의 계측치로 각각 64.0%, 75.8%를 설명할 수 있었다. 이상의 연구에서 골격성 III급 부정교합자의 치료 전, 후의 변화량과 치료 전 측모두부방사선 규격사진 및 석고모형 간에 관련성이 있었고 악교정수술을 동반한 교정치료 계획을 수립할 때 술전교정치료의 목표 설정과 악교정수술 결과의 예측에 도움이 될 것으로 판단된다.

• 대한치과교정학회지
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• 제25권1호
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• pp.1-12
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• 1995

본 연구는 초진시의 골격형태로부터 이모장치에 대한 반응성을 예측하는 지표를 구하여 III급부정교합환자의 조기 치료를 결정할 때 고려할 수 있는 기준를 마련하기 위해 시행하였다. 성장기의 골격성 III급 부정교합아동 40명을 연구대상으로 하였으며, 이들을 영구치열완성 이후의 교합의 안정성과 최대성장기 이후의 안모의 개선도를 기준으로하여 양호반응군 25명과 불량반응군 15명으로 나누었다. 초진시 두 군 사이에 현저한 차이를 보이는 주요 골격계측항목을 선택하고, 판별분석을 시행하여 다음의 결과를 얻었다. 1. 치료전 $Bj\ddot{o}rk$ sum, 전후안면고경비율, genial angle, lower genial angle, occlusal plane to SN, occlusal plane to AB plane angle 등의 항목에서 두 군 사이의 유의성이 인정되어 양호반응군이 불량반응군에 비해 치료전에 보다 수평적인 안모형태를 지니고 있었음을 알 수 이었다. 2. $Bj\ddot{o}rk$ sum등 두군사이에 유의한 차이를 보인 각 항목들의 임계값과 판별력을 구하였다. 3. 판별에 기여도가 높은 세 항목 즉, $Bj\ddot{o}rk$ sum, genial angle 그리고 occlusal plane to An plane angle을 이용한 판별식을 구하였으며, 이를 이용할 때 본 연구에 사용된 표본의 $85\%$를 올바르게 판별할 수 있었다.

• 대한치과교정학회지
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• 제13권1호
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• pp.31-43
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• 1983

The following results were abtained based on the research of the occlusal patterns among 1074 handicapped persons (cerebral palsy: 46, mental subnormality: 619, deafmute: 285, blind: 111, childish autism:8, cleft lip and cleft palate:3, polimyelitis:2) of the age between 6 and 23 in Chollanamdo, Korea, in comparison with a normal group of 1048 children of the age between 6 and 15 selected at random in J primary school in Gwang-ju City. 1. According to Angle's malocclusion classification, all the handicapped groups, except the cerebral palsy and the blind, showed a higher prevalence of malocclusion than that of the normal. Especially the prevalence of Class II, devision 1 malocclusion in the cerebral palsy was the highest, and the prevalence of Class III malocclusion in all the handicapped groups was higher than that of the normal group. Among these groups the highest prevalence of Class III malocclusion was in the Down's syndrome group. 2. On the the abnormal pattern of the anterior region, there was no significant difference $(P\leqq0.05)$ between the normal and the cerebral palsy, the deafmute, and e blind. The open bite $(7.27{\pm}1.04\%)$ and the cross-bite $(32.7{\pm}6.33\%)$ of the Down's syndrome wire higher than that of the normal, and the forward position of the mandible could be recognized in the Down's syndrome group. 3. On the midline position of the dentition, all the handicapped showed the same percentage of deviation, but the degree of mandibular shift to the right $(20.00{\pm}5.39\%)$ or left $(10.91{\pm}4.20\%)$ was higher than that of the normal only in the Down's syndrome group. 4. On the abnormal pattern of the posterior region, the cross-bite of the Down's syndrome was higher than that of the normal by $20.00{\pm}5.39\%$, the cross-bite of the cerebral palsy and the cross-bite and the open bite of the mental subnormality were slightly higher than that of the normal. The other handicapped groups showed no significant difference $(P\leq0.05)$ to the normal.

• 대한치과교정학회지
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• 제30권5호
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• pp.643-655
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• 2000

양악 수술에서 교합평면의 위치설정은 수술 후 새로운 위치에서의 안정성을 결정하는 중요한 요인으로써 악교정 수술환자의 진단과 치료 계획시 반드시 고려되어져야 한다. 따라서, 본 연구에서는 악교정 수술 계획시 Delaire의 구조적 구성적 방법으로 이상적인 교합평면을 설정한 경우 교합평면의 장기적인 안정성에 대해서 고찰해봄으로써 향후 악교정 수술의 진단 및 치료계획에 도움이 되고자 하였다. 본 연구에서는 골격성 제 III급 부정교합 환자 중 Delaire의 구조적 구성적 방법으로 이상적인 교합평면을 설정하여 양악수술을 시행받은 환자 25명 (남자 8명, 여자 17명, 평균 연령 $23.2{\pm}3.17$세)를 대상으로 하여, 수술후 교합평면의 안정성에 대한 평가를 시행하였다. 수술직전($T_1$)과 수술직후($T_2$, 평균 15.4일), 수술 후 최소 1년 이상 경과후($T_3$, 평균 32.6개월)을 비교함으로써 다음과 같은 결론을 얻었다. 1. 양악 수술 후 교합평면각의 유의성 있는 변화는 없었으며, 수술방법(SSRO, IVRO)에 따른 유의성 있는 변화를 보이지 않았다. 2. 술후 교합평면의 변화는 수술에 의한 악골의 이동량이나 posterior impaction의 양, 수술후 경과시간과 상관관계를 보이지 않았다. 3. 수술 후, SSRO 시행군에서는 유의하게 하악골의 전방이동이 일어났으며, IVRO 시행군에서는 하악골이 후하방 이동하면서 gonial angle과 하악평면각이 증가함으로써 하악 치아의 정출이 발생하였다.