• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2008년도 Spring Scientific Meeting(the 129th) of Korean Academy if Conservative Dentistry
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• pp.246-257
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• 2008

이 연구의 목적은 3차원 유한요소분석법을 사용하여 교합력의 위치와 방향이 상악 제2소구치의 치경부 복합레진 수복물의 응력분포에 미치는 영향에 대해 평가해 보고자 하였다. 발치된 상악 제2소구치를 이용하여 micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium)로 스캔한 후 HyperMesh Ver 6.0 (Altair Engineering, Inc., Troy, USA)와 3D-DOCTOR (Able Software Co., Lexington, MA, USA)로 3차원 유한요소 모형을 제작하였다. 제작된 소구치 모형에 쐐기형 와동을 형성하고 탄성계수가 서로 다른 혼합형 복합레진과 흐름성 복합레진으로 각각 수복하였다. 수복 후 설측교두의 협측사면 세 위치에 각각 수직, 20도, 40도의 각도로 하중을 가한 후 응력분포를 ANSYS Ver 9.0 (Swanson Analysis Systems. Inc., Houston, USA) 프로그램을 이용하여 인장 응력의 분포를 분석한 바 하중 위치와 관계없이 하중방향의 각도가 증가할수록, 또한 수복재료의 탄성 계수가 높을수록 인장응력도 증가하는 것으로 보아 교합력의 방향과 수복재료의 탄성계수가 치경부 수복물의 응력분포에 중요한 영향을 미치는 요소로 사료된다.

• Restorative Dentistry and Endodontics
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• 제33권3호
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• pp.246-257
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• 2008

이 연구의 목적은 3차원 유한요소분석법을 사용하여 교합력의 위치와 방향이 상악 제2소구치의 치경부 복합레진 수복물의 응력분포에 미치는 영향에 대해 평가해 보고자 하였다. 발치된 상악 제2소구치를 이용하여 micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium)로 스캔한 후 HyperMesh Ver 6.0 (Altair Engineering, Inc., Troy, USA)와 3D-DOCTOR (Able Software Co., Lexington, MA, USA)로 3차원 유한요소 모형을 제작하였다. 제작된 소구치 모형에 쐐기형 와동을 형성하고 탄성계수가 서로 다른 혼합형 복합레진과 흐름성 복합레진으로 각각 수복하였다. 수복 후 설측교두의 협측사면 세 위치에 각각 수직, 20도, 40도의 각도로 하중을 가한 후 응력분포를 ANSYS Ver. 9.0 (Swanson Analysis Systems. Inc., Houston, USA) 프로그램을 이용하여 인장 응력의 분포를 분석한 바 하중 위치와 관계없이 하중방향의 각도가 증가할수록, 또한 수복재료의 탄성계수가 높을수록 인장응력도 증가하는 것으로 보아 교합력의 방향과 수복재료의 탄성계수가 치경부 수복물의 응력분포에 중요한 영향을 미치는 요소로 사료된다.

• Journal of Oral Medicine and Pain
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• 제25권2호
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• pp.173-189
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• 2000

The purpose of this study was to evaluate the effect of specific head positions on the mandibular rotational torque movements in maximum mouth opening, protrusion and lateral excursion. Thirty dental students without any sign or symptom of temporomandibular disorders(TMDs) were included as a control group and 90 patients with TMDs were selected and examined by routine diagnostic procedure for TMDs including radiographs and were classified into 3 subgroups : disc displacement with reduction, disc displacement without reduction, and degenerative joint disease. Mandibular rotational torque movements were observed in four head postures: upright head posture(NHP), upward head posture(UHP), downward head posture(DHP), and forward head posture(FHP). For UHP, the head was inclined 30 degrees upward: for DHP, the head was inclined 30 degrees downward: for FHP, the head was positioned 4cm forward. These positions were adjusted with the use of cervical range-of-motion instrumentation(CROM, Performance Attainment Inc., St. Paul, U.S.A.). Mandibular rotational torque movements were monitored with the Rotate program of BioPAK system (Bioresearch Inc., WI, U.S.A.). The rotational torque movements in frontal and horizontal plane during mandibular border movement were recorded with two parameters: frontal rotational torque angle and horizontal rotational torque angle. The data obtained was analyzed by the SAS/Stat program. The obtained results were as follows : 1. The control group showed significantly larger mandibular rotational angles in UHP than those in DHP and FHP during maximum mouth opening in both frontal and horizontal planes. Disc displacement with reduction group showed significantly larger mandibular rotational angles in DHP and FHP than those in NHP during lateral excursion to the affected and non-affected sides in both frontal and horizontal planes(p<0.05). 2. Disc displacement without reduction group showed significantly larger mandibular rotational angles in FHP than those in any other head postures during maximum mouth opening as well as lateral excursion to the affected and non-affected sides in both frontal and horizontal planes. Degenerative joint disease group showed significantly larger mandibular rotational angles in FHP than those in any other head postures during maximum mouth opening, protrusion and lateral excursion in both frontal and horizontal planes(p<0.05). 3. In NHP, mandibular rotational angle of the control group was significantly larger than that of any other patient subgroups. Mandibular rotational angle of disc displacement with reduction group was significantly larger than that of disc displacement without reduction group during maximum mouth opening in the frontal plane. Mandibular rotational angle of disc displacement without reduction group was significantly larger than that of disc displacement with reduction group or degenerative joint disease group during maximum mouth opening in the horizontal plane(p<0.05). 4. In NHP, mandibular rotational angles of disc displacement without reduction group were significantly larger than those of the control group or disc displacement with reduction group during lateral excursion to the affected side in both frontal and horizontal planes. Mandibular rotational angle of disc displacement without reduction group was significantly smaller than that of the control group during lateral excursion to the non-affected side in frontal plane. Mandibular rotational angle of disc displacement without reduction group was significantly larger than that of disc displacement with reduction group during lateral excursion to the non-affected side in the horizontal plane(p<0.05). 5. In NHP, mandibular rotational angle of the control group was significantly smaller than that of disc displacement with reduction group or disc displacement without reduction group during protrusion in the frontal plane. Mandibular rotational angle of disc displacement without reduction group was significantly larger than that of the disc displacement with reduction group or degenerative joint disease group during protrusion in the horizontal plane. Mandibular rotational angle of the control group was significantly smaller than that of disc displacement without reduction group or degenerative joint disease group during protrusion in the horizontal plane(p<0.05). 6. In NHP, disc displacement without reduction group and degenerative joint disease group showed significantly larger mandibular rotational angles during lateral excursion to the affected side than during lateral excursion to the non-affected side in both frontal and horizontal planes(p<0.05). The findings indicate that changes in head posture can influence mandibular rotational torque movements. The more advanced state is a progressive stage of TMDs, the more influenced by FHP are mandibular rotational torque movements of the patients with TMDs.

• 구강회복응용과학지
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• 제22권4호
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• pp.271-281
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• 2006

Long term prediction of surgical result of skeletal class III has not been evaluated adequately because the stability of orthognathic surgery would be affected by not only set back amount of mandible but also many other factors like skeletal pattern, hyoid position, and airway size. The aimof this study is to discriminate the factors which affect the stability of post-treatment result of surgical outcome of sagittal split ramus osteotomy. We have collected 37 patients (male: 17, female: 20) from patients who have been treated at Orthodontic Department in Dankook University. The patients underwent 3 times Cephalometric X-ray taking at pre-, post-orthognathic surgery and after 12 months retention. The subjects were divided into 2 groups (Stable group: 21, Relapse group: 16) according to their relapse amount. We have taken following results from Students t-test and discriminant analysis. The discriminant factors which discern relapse and stable groupe among treatment change variables were BX and Ba-HY. Hyoid bone moved to posterior and inferior position due to surgery and repositioned superiorly and posteriorly during retention period. Skeletal patterns of the relapse group are smaller mandibular plane angle, anterior mandibular position, and greater distance from hyoid bone to cervical bone and mandible respectively.

• 한국의류산업학회지
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• 제17권2호
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• pp.258-264
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• 2015

This study provides abasis for the development of high functional cycle wear with clothing comfort and fitness for highschool boy cyclists by a comparison of the somatotype of highschool boys cyclists and general highschool boys. This study directly measured 44 anthropometric targeted cyclists across Korea. "The sixth national standard physical survey" data targeted 16 to 18-year-old male adolescents; subsequently, anthropometric measurement data was provided by 766 people for research. Highschool boy cyclists used t-test to compare the differences in body type. The results in this study are follows. Highschool boys cyclists(compared to regular highschool boys) indicated a great somatotype stature and weight. The differences in the cervical height and the acromion height results of, cyclist appeared smaller. Cyclists angle of shoulder was smaller. The upper body of highschool boys cyclist was greater than the difference between chest breadth and bust breadth with along biacromion length. The waist front length of the cyclist was a short cycle ride upon the attitude of the streamlined. Highschool boy cyclists indicated that the muscles of the arm portion was more developed compared to general highschool boys. The lower body had less abdominal fat with a significantly developed thigh and calf.

• The Journal of Korean Physical Therapy
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• 제28권3호
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• pp.183-188
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• 2016

Purpose: The aim of the study was to investigate neck posture, range of motion, muscle endurance and self-report of pain and disability in smartphone users. Methods: Seventy-eight university student volunteers, aged between 18 and 30 years (mean age 23.2), were assessed for: a head-neck posture by measuring cranial vertical angle, neck range of motions using cervical range of motion device, and a deep neck flexor endurance using a stabilizer. Finally, subjects were asked about their neck pain and completed disability questionnaires, ie, Short Form McGill Pain Questionnaire, Neck Disability Index, and World Health Organization Disability Assessment Schedule 2.0. Results: Thirty-eight subjects experienced recurrent neck pain with/without upper limb pain (neck pain group) and 40 reported no current neck pain with/without upper limb pain (no neck pain group). Differences were found between groups on pain and disability questionnaires. Subjects with neck pain had significantly higher disability scores than those of no neck pain group. However, there were no differences observed between groups in a head-neck posture, neck range of motions, and deep neck muscle endurance time. The smartphone usage time was negatively correlated with neck pain intensity and disability score whereas it had positive relationship with flexibility and posture. Conclusion: Group differences were observed as lower capacity not only for neck specific daily activities but for general functioning in daily routine when the neck pain and no neck pain groups were compared. Therefore, functioning in daily activities should be investigated as prevention for further developing neck pain in smartphone users.

• 한국의류산업학회지
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• 제26권1호
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• pp.35-43
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• 2024

This study aimed to objectively classify the lateral torso posture types and functions of older women. We used 3D body scan data of 119 women aged 70-85 years from the 6th SizeKorea project. First, we defined three torso axes to represent the lateral torso posture types: posterior waist-back, back-cervical, and whole torso axes. Next, we asked experts to select one of four lateral torso posture types-stooped, straight, leaning back, and swayback postures-by looking at the lateral photographic data of 119 older women. To identify the axis that best represented each lateral torso posture type, a discriminant analysis was conducted using the angle of each of the three torso axes as an independent variable and an expert's visual classification as a dependent variable. Based on the analysis, the whole torso and backcervical axis angles were selected as variables for judging lateral torso posture types. Subsequently, we developed a classification function to determine which of the four lateral torso posture types of a particular participant was applicable for a new individual. The method developed in this study is significant in that it enables the objective classification of the lateral torso postures types of older women.

• 대한치과보철학회지
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• 제54권4호
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• pp.387-392
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• 2016

목적: 본 연구의 목적은 grooved abutment가 지대주 나사풀림 현상에 미치는 영향을 확인하는 것이다. 재료 및 방법: 2015년 3월부터 7월까지 연세대학교 치과대학병원 보철과에 내원한 50명, 51개 임플란트에 대해서 임플란트 보철 장착 후 6개월 점검 시 지대주 연결나사의 안정성을 평가하였다. 대조군은 groove가 없는 지대주를 사용한 30개 임플란트이었고, 실험군은 groove가 있는 지대주를 사용한 21개 임플란트이었으며, Astra, Straumann, Implantium, Osstem 시스템이 사용되었다. 6개월 점검 시에 지대주 연결나사의 풀림여부를 조사하였고, 동일한 힘으로 재체결 시 지대주 연결나사의 추가 회전각을 측정하였으며, 보철물 협측하방 부위에서 PTV를 측정하였다. SPSS 프로그램을 이용하여 정규성 분석 후 Mann-Whitney 분석을 시행하였다. 결과: 51개 임플란트에 대해 보철 장착 후 6개월 점검을 시행한 바, 나사 풀림이나 보철물 파절 등의 특이할 만한 합병증은 나타나지 않았다. 6개월 후 지대주 연결나사의 추가회전각은, 실험군 평균은 $4.75^{\circ}$이었고 대조군 평균은 $7.35^{\circ}$이었으며, 통계적으로 유의한 차이는 없었다 (P = .576). PTV에서도 유의한 차이는 없었다 (P = .767). 결론: 지대주의 groove 여부가 지대주 연결나사의 안정성에 미치는 영향은 유의한 차이가 없으나, 이에 대해 좀더 장기적이고 다수의 증례를 이용한 추가적인 연구가 필요해 보인다.

• Archives of Plastic Surgery
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• 제36권5호
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• pp.629-636
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• 2009

Purposes: Wide scars occurring on the lower face and neck are a source of both functional and esthetic problems. Consequently, we can use skin grafts, pedicled flaps, free flaps, and tissue expansion for the reconstruction of this area. Compared with other reconstruction techniques, tissue expansion is advantageous in that it enables the maintenance of a color and texture similar to that of the adjacent tissue. However, the conventional method of tissue expansion has been reported to lead to an unnatural cervicomental angle and to the deformity of adjacent structures. We have therefore made efforts to prevent these problems through the use of several operative procedures. Methods: Forty-one patients with lower facial and cervical scars underwent tissue expansion. The tissue expansion was performed using a rectangular-shaped Nagosil$^{(R)}$ tissue expansion device. On insertion of the tissue expander, the intermediate area of superficial fat layer was dissected and then the tissue expander was inserted to make a flap that was as thin as possible. In advancement of the flap, a capsule-formed by the tissue expander-was used for the interrupted fixed suture of the flap to the fascia of the platysma muscle of the neck. This procedure was performed multiple times and also performed between the flap and the periosteum of the mandible, such that the tension was removed during the suture of the flap margin. Finally, the patients were fitted with a Jobst$^{(R)}$ facial garment in order to stabilize the operation site at least twelve months. Results: The most prevalent location of the scar was the cheek (15 cases), followed by the chin in 14 cases and the neck in 12 cases. The mean size of scar was $55.7{\pm}39.4cm^2$. Conclusions: Using our procedures, we have experienced no significant deformities and have also achieved a more natural cervicomental angle in the patients.

• 한국융합학회논문지
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• 제9권11호
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• pp.209-216
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• 2018

본 연구는 환자 구강내의 상악 우측 대구치 구개면 직접시진 시 환자 머리 각도의 변화에 따른 술자(치과위생사)의 목 주변 근육 활성도의 관련성을 알아보고자 하였다. 술자는 해당부위의 위치와 손고정, 기구 사용에 대한 정확한 이해와 인지를 하고 있는 예비 치과위생사인 치위생학과 4학년 학생들로 표면 근전도, 목 각도계를 이용하여 목 주변 근육 활성도 변화의 자료를 수집하여 SPSS statistics 20을 이용해 Shapiro-wilk 검정, 일원배치 분산분석의 통계처리를 실시하였다. 연구결과 환자 머리의 각도를 주었을 때 각도를 주지 않은 자세 보다 술자의 위등세모근, 목세움근, 어깨올림근 근활성도가 모두 유의하게 감소하였다. 술자의 머리 각도는 환자 머리 각도를 준 자세가 머리 각도를 주지 않은 자세 보다 머리 굽힘은 유의하게 감소하였다. 결과적으로 치아 처치 시 환자 머리 각도의 변화를 주는 것은 술자의 목 주변 근육의 과도한 근활성도를 줄이고 근육 피로도를 낮출 것으로 예상됨으로 치아 처치 시 환자의 머리 각도 변화의 시행을 추천한다. 이는 잘못된 자세의 반복행위로 인한 근육의 통증도 줄일 수 있을 것이라 사료된다.