• 대한치과보철학회지
• /
• 제36권6호
• /
• pp.878-887
• /
• 1998

Although attachments have been utilized for a retainer of removable prostheses during several decades, there is little information on the force distribution by the attachments. This study was undertaken to evaluate the stress patterns developed by partial dentures employing rigid attachments on the supporting structures. Four types of the mandibular removable partial dentures were designed depending upon the position of the rigid attachment and the existency of lingual bracing. Under 100N of vertical and 25N of lateral loads on the 1st and 2nd lower molar of partial denture, stress distribution patterns and displacement were analysed with three dimensional finite element method by ANSYS version 5.3. 1. The highest stresses were concentrated on the distal alveolar crest of posterior abutment and the second stresses on the apical region of posterior abutment in the models. 2. The greatest displacement were shown on the distal alveolar crest of posterior abutment and the second displacement on the distal alveolar crest of anterior abutment in the models. 3. There was little difference between the models with intraoral attachment and those with extracoronal attachment. 4. There was little difference between the models with and without the lingual bracing.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제41권3호
• /
• pp.125-132
• /
• 2015

Objectives: The purpose of this study was to clarify which findings in magnetic resonance imaging (MRI) are good predicators of pain and mouth opening limitation in patients with temporomandibular joint (TMJ) internal derangement (ID). Materials and Methods: Clinical examinations for pain and mouth opening limitation were conducted for suspected TMJ ID. MRI scans were taken within a week of clinical examinations. On the oblique-sagittal plane image, readings were obtained in terms of the functional aspect of disc position, degree of displacement, disc deformity, joint effusion, and osteoarthrosis. Multiple logistic regression analyses were conducted to identify the predictors of pain and mouth opening limitation. Results: A total of 48 patients (96 TMJs) were studied, including 39 female patients and 9 male patients whose ages ranged from 10 to 65 years. The resultant data showed significant correlations between pain and the MR imaging of the degree of disc displacement (P<0.05). The probability of there being pain in moderate to significant cases was 9.69 times higher than in normal cases. No significant correlation was found between mouth opening limitation and MRI findings. Conclusion: We identified a significant correlation between clinical symptoms and MRI findings of ID. The degree of anterior disc displacement may be useful for predicting pain in patients with TMJ ID.

• The Journal of Korean Physical Therapy
• /
• 제12권3호
• /
• pp.455-467
• /
• 2000

The purpose of this study was to analyse the effects of disc degeneration on the biomechanical behaviors of the intervertebral disc in term of axial displacement, intradiscal pressure. disc bulge at the 1.4-1.5 functional spinal unit(FSU). The degeneration is divided 4 grade by initial intradiscal pressure: normal: 135kPa. mild: 107kPa. moderate: 47kPa, severe: 15kPa, The predicted results were follows: 1. The magnitude of the bulge is found to be maximum at the anterior, minimum at the postero-lateral portion. The bulge of lateral, postero-lateral is found to be maximum in severe grade. followed by moderate. mild, normal grade. 2. Tho displacement was increased with increasing compressive load in all four grades.'rho stiffness of disc was found to be reduced by progressing from normal to severe grade. 3. The intradiscal pressure was increased nearly linearly with increasing compressive load in normal and mild grade. But the increasing rate in moderate and severe grade was showed apparently different from nomal and mild grade. Specially, it was increased very slightly in severe grade. In conclusion, decreased intradiscal pressure resulted in increase of axial displacement and disc bulge with compressive load increasing. these may compromise the nerve root impingement or irritation. Therefore posture and activities must be focus to reduce compressive load applied on the back or disc.

• PNF and Movement
• /
• 제13권1호
• /
• pp.39-46
• /
• 2015

Purpose: The accelerometer is a tool for evaluating walking by the displacement of the center of mass (COM) in the body. Recently, smartphones have added an accelerometer app, and it can be used to evaluate outcomemanures in rehabilitation. The purpose of this study was to investigate the COM in the bodies of normal persons and stroke patients using this smartphone application while walking. Methods: Twenty normal persons and twenty-two stroke patients were recruited and had their COM measured using G-walk and the smartphone application, SMAP, during 10 m walking. Subjects repeated the 10 m of walking 3 times, and we used the SMAP, Accelerometer Monitor ver. 1.5.0, to evaluate COM during the walk. To measure the displacement of COM, we used the difference in value between the maximal angle and the minimum anterior-posterior (AP), mediolateral (ML), and rotational angles during the walk. Results: For the normal persons, there was significant correlation between the AP and AP of SMAP, and was also a significant correlation between rotational angle and the ML of SMAP. In the stroke patients, there was significant correlation between AP and ML, and the rotational angle of SMAP. Conclusion: Our research results suggest that if the SMAP system is reinforced in the case of patients who have a greater displacement of COM, it may be used as an evaluation tool during walking.

• 대한치과교정학회지
• /
• 제53권2호
• /
• pp.106-115
• /
• 2023

Objective: To evaluate the null hypothesis that there is no difference in a set of clinical predictors of potentially impacted canines between low-risk patients with and without displaced canines. Methods: The normal canine position group consisted of 30 patients with 60 normally erupting canines ranked in sector I (age, 9.30 ± 0.94 years). The displaced canine group comprised 30 patients with 41 potentially impacted canines ranked in sectors II to IV (age, 9.46 ± 0.78 years). Maxillary lateral incisor crown angulation, inclination, rotation, width, height, and shape, as well as palatal depth, arch length, width, and perimeter composed a set of clinical predictors, which were evaluated on digital dental casts. Statistical analyses consisted of group comparisons and variable correlations (p < 0.05). Results: There was a significant association between sex and mesially displaced canines. Unilateral canine displacement was more prevalent than bilateral displacement. The crown of the maxillary lateral incisors was significantly angulated more mesially and rotated mesiolabially in low-risk patients with displaced canines, who also had a shallower palate and shorter anterior dental arch length. Lateral incisor crown angulation and rotation, as well as palatal depth and arch length, were significantly correlated with the canine displacement severity. Conclusions: The null hypothesis was rejected. Maxillary lateral incisor angulation inconsistent with the "ugly duckling" stage as well as a shallow palate and short arch length are clinical predictors that can significantly contribute to the early screening of ectopic canines in low-risk patients.

• 대한중풍순환신경학회지
• /
• 제14권1호
• /
• pp.15-22
• /
• 2013

■ Objectives The aim of this study is to look into the correlation between motor performance and displacement of center of pressure(CoP) in hemiplegic patients with cerebral stroke. ■ Methods We measured manual muscle test(MMT) as motor performance value and, anterior/posterior position(Ant./Post. position) and lateral symmetry of CoP as displacement of CoP values from 129 stroke patients. The gait analysis was carried out using treadmill gait analysis equipment. ■ Results In terms of motor performance, MMT of upper extremity negatively correlated with Ant/Post position of CoP, however, one of lower extremity did not. In addition, MMT of both extremities negatively correlated with lateral symmetry of CoP. ■ Conclusion Displacement of CoP was negatively correlated with hemiplegic patient's motor performance.

• 대한관절경학회지
• /
• 제12권2호
• /
• pp.112-117
• /
• 2008

목적: 이중 다발을 이용한 전방십자인대 재건술은 등장성과 해부학적 기능을 회복할 수 있다는 장점이 있다. 본 연구는 전방십자인대 손상 환자에서 부가적인 전내측 입구를 통한, 자가 슬괵건을 이용한 이중 다발 재건술의 임상적 결과를 평가하고자 한다. 대상 및 방법: 2005년 1월부터 2006년 7월까지 자가 슬괵건(hamstring tendon)을 이용하여 이중 다발 전방십자인대 재건술을 시행한 60예(남자: 52예, 여자: 8예)를 대상으로 하였다. 평균 나이는 31.7세($20{\sim}51$세)였다. 평균 추시 기간은 13.4개월($12{\sim}16$개월)이었다. 슬관절의 경골 조면 부위에서 수평 사위(horizontal-oblique)의 피부 절개를 시행하여 반건양건(semitendinosus tendon)과 박건(gracilis tendon)을 얻었다. 후외측 다발을 위한 경골 터널은 해부학적인 위치에 만들었다. Yasuda 등이 보고한 방법을 변형하여, 후외측 다발을 위한 대퇴골 터널은 부가적인 전내측 입구를 통하여 만들었다. 전내측 다발에 대하여는 통상적인 방법으로 터널을 만들었다. 후외측 다발은 박건을, 전내측 다발은 반건양건을 사용하였다. 최종 추시시 관절 운동범위, 전방 전위 정도(KT-1000 관절계), pivot-shift 검사로 임상 결과를 평가하였다. 슬관절의 기능적 평가는 Lysholm score와 modified Feagin Scoring System를 측정하였다. 결과: 최종 추시시 관절 운동 범위 제한은 없었다. KT-1000 관절계를 이용한 정상측과의 비교에서 경골 전방 전위가 술전 평균 8.4 mm에서 술후 평균 1.7 mm로 향상되었다(p<0.05). Lysholm score는 술전 평균 64.1점에서 술후 평균 92.2점으로 향상되었다(p<0.05). Modified Feagin Scoring System에 의한 기능 평가에서는 90%에서 우수 이상의 결과를 보였다. 결론: 부가적인 전내측 입구를 통한, 자가 슬괵건을 이용한 이중 다발 전방십자인대 재건술은 우수한 임상 결과를 보였다.

• 대한정형외과스포츠의학회지
• /
• 제9권2호
• /
• pp.73-78
• /
• 2010

목적: 50세 미만 및 50세 이상의 환자에서 전방 십자 인대 재건술 시행의 임상적 결과를 후향적으로 비교 분석하고자 하였다. 대상 및 방법: 2004년 7월부터 2008년 4월까지 전방 십자 인대 재건술을 시행 받은 환자 중 50세 이상(평균 55.1세) 18예, 50세 미만(평균 31.2세) 198예를 대상으로 하였으며, 평균 추시 기간은 50세 이상이 24개월, 50세 미만 군이 26개월 이었다. 임상적 평가는 Lysholm 점수 및 IKDC (International Knee Documentation Committee) 평가 기준을 사용하였고 전방 전위 정도는 KT-2000 관절 계측기를 이용하였으며 두 군간의 최종 추시 시의 결과를 비교 분석하였다. 결과: Lysholm 점수는 50세 이상 군에서는 69.5점에서 93.6점으로 호전되었으며, 50세 미만 군에서는 69.0점에서 92.6점으로 호전되었다(p<0.05). IKDC 평가 기준에 의한 최종 평가상 50세 이상 군의 83% (15예)에서 거의 정상(B) 이상의 결과를 보였고, 50세 미만군의 86% (170예)에서 거의 정상(B) 이상의 결과를 보였다(p<0.05). KT-2000 관절 계측기를 이용한 전방 전위 검사 상 건측과의 평균 전위차가 50세 이상 군에서는 술전 7.4 mm에서 최종 추시 시 2.2 mm로 감소하였고, 50세 미만 군에서는 술 전 7.1 mm에서 최종 추시 시 2.0 mm으로 감소하였다(p<0.05). 결론: 50세 이상 군과 50세 미만 군에서의 전방 십자 인대 재건술의 임상적 결과는 두 군 간에 유의한 차이가 없었으며, 50세 이상 환자에서도 만족할 만한 전방 십자 인대 재건술의 결과를 얻을 수 있었다.

• 대한관절경학회지
• /
• 제16권1호
• /
• pp.1-8
• /
• 2012

목적: 새로운 수술 적응증으로 선별한 성장판이 열려있는 전방십자인대 손상 환자에서 성장판을 통과하는 전방십자인대 재건술 후 임상적 및 방사선적 결과를 분석하고자 하였다. 대상 및 방법: 2005년 1월부터 2007년 1월까지 성장판이 열린 환자에서 성장판을 통과하는 십자인대 재건술을 시행한 환자 15명을 대상으로 평균 4.3년(4-6) 추시하였다. 수술 적응증은 역연령이 남자는 16세, 여자는 14세 이상이고, 성장판이 2 mm 이하로 열려있는 경우와 Risser sign과 성 성숙도(Tanner stage) 3 이상으로 설정하였다. 사용된 이식건은 모두 동종 전경골건를 사용하였으며, 대퇴골과 경골 부위 고정은 각각 endobutton과 bioscrew로 시행하였다. 기능적 평가는 Lysholm knee score scale과 Tegner activity level scale, International Knee Documentation Committee (IKDC) 2000 subjective score를 조사하였다. 이학적 검사상 안정성은 Lachman과 pivot shift 검사로 평가하였다. 방사선적 평가는 stress 영상에서 건측과의 전방 전위의 차이와, 최종 추시 시 scannogram상 양측간 하지부동정도, 대퇴경골각, 해부학적 및 역학적 외측 원위 대퇴각, 역학적 내측 근위 경골각의 차이로 하였다. 결과: Lysholm knee score scale은 술 전 평균 51점에서 술 후 최종 추시 상 97점으로, Tegner activity level scale은 술 전 평균 2.6점에서 술 후 7.1점으로, IKDC score는 술 전 평균 32.6점에서 술 후 88.3점으로 호전되었다. 건측과의 전방 전위의 차이는 술 전 평균 6.7(${\pm}1.0$) mm에서 술 후 평균 1.9(${\pm}0.9$) mm로 호전되었다. 골 변형을 평가하기 위한 모든 영상 지표들은 건측과 통계적으로 유의한 차이를 보이지 않았으며, Scannogram 상 하지부동은 평균 1.5 mm로 5 mm를 초과하는 하지부동은 관찰되지 않았다. 결론: 저자들의 새로운 수술 적응증으로 선별할 경우, 성장판이 열려있는 환자에서도 성장판을 통과하는 전방십자인대 재건술로 유의한 성장장애 없이 좋은 임상적 결과를 얻을 수 있을 것으로 사료된다.

• Restorative Dentistry and Endodontics
• /
• 제37권3호
• /
• pp.180-184
• /
• 2012

Traumatic injuries of the face often involve root fractures especially in anterior teeth. The prognosis and the treatment of the root fracture depend on the extent of the fracture line, general health and patient compliance. This case report outlines a new conservative trial treatment modality to stabilize the maxillary central incisors with horizontal root fracture on the cervical to middle third by fabricating canine guidance to remove loading on the traumatized maxillary central incisors during eccentric movements and thus inducing spontaneous healing of the fractured line between the fragments. Radiographs after thirty months showed adequate healing with no signs of pathological changes including root resorption, ankylosis or displacement. Long term follow-up revealed that vitality, stability and aesthetics were maintained and the patient was satisfied with the outcome.