• The Journal of Korean Academy of Prosthodontics
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• v.31 no.3
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• pp.351-384
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• 1993

Complete denture occlusion must be developed to function efficiently and with the least amount of trauma to the supporting tissues. For the preservation of supporting tissues, it is imperative to reduce to a minimum the functional stress induced by dentures. The magnitude of the horizontal component of functional stress contributed by various occlusal teeth forms has not been studied. This study was aimed to investigate the influence of different occlusal teeth forms on the mode of distribution of the stresses in the mandibular tissue, and the displacement of lower dentures during the variant functional movement of mandible for this study three dimensional finite element analysis was used. FEM models were created using commercial software Super Sap for IBM 32 bit computer. The model was composed of 3380 brick elements and 4346 nodes. The results were as follows. 1. The magnitude of stress was similar between two models in centric occlusion, in the case of anatomic model, the stress was concentrated on the buccal side of alveolar ridge beneath the bicuspids. 2. During the protrusive movement, the increasing of stress from the posterior to anterior part of mandible was seen in the case of anatomic model. 3. During the lateral movement, the stress of anatomic model was greater than that of nonanatomic model. 4. The stress of anatomic model was concentrated on the anterior region of residual ridge during the lateral movement. 5. In the case of anatomic model the anterior part of denture was displaced severely at the centric and lateral position, but the denture of nonanatomic model was displaced minutely at the protrusive and lateral position.

• Journal of Korean Dental Science
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• v.1 no.1
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• pp.10-14
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• 2008

The fracture of facial bone usually accompanies alveolar bone fracture and dislocation or fracture of teeth. Thus, aside from the reduction of fracture, the reconstruction of occlusion through the rehabilitation of lost teeth should be considered. The dislocation of tooth after trauma accompanying alveolar bone fracture needs bone grafting in case of implant treatment. Although autogenous bone graft shows good prognosis, it has the disadvantage of requiring a secondary surgery. This is a case of a mandibular condyle head fracture accompanied by alveolar bone fracture. The condylar head fragment removed during open reduction was grafted to the alveolar bone fracture site, thereby foregoing the need for secondary surgery.

• The Journal of Korean Academy of Prosthodontics
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• v.9 no.1
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• pp.59-62
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• 1969

The causes of periodontal disease have been descried as malocclusion, trauma from occlusion, local irritants and poor oral hygien. The systemic factor has also been considered as a etiologic factor of periodontal disease. On the other aspect systemic condition could be affected by periodontal disease. For the study of relationships between periodontal disease and systemic condition, twenty patients with periodontal disease and twenty persons with no periodontal involvement were evaluated for inorganic elements and organic materials in the blood. The results of the blood analysis of the two groups were as follows. : Phosphorus and alkline-phoshatase in the group with periodontal disease showed slightly increased phenomenon compared to the control group, and on the other hand calcium and calcium-phosphorus ratio decreased phenomenon. But there is no any significant alteration in the content of each element between the two groups.

• Journal of Dental Rehabilitation and Applied Science
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• v.19 no.2
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• pp.109-113
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• 2003

The inferior alveolar nerve provides unilateral innervation to the dentition, labial mucosa and skin from about commissure to the mental protuberance. Injury to this nerve resulting in sensory impairment can be a distressing problem to some patients. The causes of this problem include trauma, extraction, implant surgery and any maxillofacial surgery and generally the altered sensation is temporary. The surgical procedure has been the most common treatment for this condition but it has some complications. The antidepressants and anticonvulsants have been effective to the treatment of trigeminal dysesthesia. This case report suggests that the use of antidepressants and anticonvulsants is an alternative method to treat the paresthesia after implant surgery or extraction.

• The Journal of the Korean dental association
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• v.51 no.11
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• pp.604-609
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• 2013

Crown fractures are relatively common trauma to anterior teeth, and should be restored immediately in most cases. For those who suffer from unfortunate traumatic episode, the best treatment option should be minimally invasive approach. In the presence of fractured tooth fragment, reattachment procedure creates positive emotional response in the patient and simplifies the procedure and maintenance of the patient's original tooth anatomy and occlusion. Without fractured tooth fragment, next conservative option could be direct composite restoration which is based on minimal invasion concept. This article proposes simple and very conservative techniques that anyone can do in daily practice.

• The Journal of Korean Academy of Prosthodontics
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• v.16 no.1
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• pp.7-11
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• 1978

The author attempted to observe the histological changes of the periodontal structures induced by trauma from occlusion. Eighteen healthy rabbits were devided into two groups; control and experimental group. Three rabbits were kept as control group, while metal crowns were seated on unilateral lower molar teeth of fifteen rabbits were kept as experimental group. And the interocc1usal distance of the incisal edge was kept 1.5mm from begining to the end of the experimental period. Rabbits of each group consisting with three rabbits were killed at the intervals of three days, one week, two weeks, four weeks, eight weeks. The antagonistic teeth of maxilla including periodontal teeth were excised and decalcified for histologic preparation. The results obtained were as follows. 1. Destructions and ulcer formation of the sulcular epithelium and gingival epithelium occurred and persisted from the beginning of the experiment to the four weeks after experiment. The epithelal attachment were proliferated apically. 2. The pressure site were observed at the apical protion, where they showed compression of the periodontal ligament, thrombosis and congestion of blood vessels and hemorrhages. 3. At the pressure site, there appeared osteoclasts and bone resorption from the first week of experiment and it became more prominent at the second week with the extend into the marrow spaces adjacent to the periodontal membrane. 4. The phenomenon of bone apposition and resorption occurred at the fourth week of experiment. The reverse line of bone trabecular were more prominent. And the reactions were ceased at the eighth week of experiment.

• Journal of Korean Neurosurgical Society
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• v.44 no.4
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• pp.228-233
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• 2008

Objective : The standard treatment strategy of intracranial aneurysms includes either endovascular coiling or microsurgical clipping. In certain situations such as in giant or dissecting aneurysms, bypass surgery followed by proximal occlusion or trapping of parent artery is required. Methods : The authors assessed the result of extracranial-intracranial (EC-IC) bypass surgery in the treatment of complex intracranial aneurysms in one institute between 2003 and 2007 retrospectively to propose its role as treatment modality. The outcomes of 15 patients with complex aneurysms treated during the last 5 years were reviewed. Six male and 9 female patients, aged 14 to 76 years, presented with symptoms related to hemorrhage in 6 cases, transient ischemic attack (TIA) in 2 un ruptured cases, and permanent infarction in one, and compressive symptoms in 3 cases. Aneurysms were mainly in the internal carotid artery (ICA) in 11 cases, middle cerebral artery (MCA) in 2, posterior cerebral artery (PCA) in one and posterior inferior cerebellar artery (PICA) in one case. Results : The types of aneurysms were 8 cases of large to giant size aneurysms, 5 cases of ICA blood blister-like aneurysms, one dissecting aneurysm, and one pseudoaneurysm related to trauma. High-flow bypass surgery was done in 6 cases with radial artery graft (RAG) in five and saphenous vein graft (SVG) in one. Low-flow bypass was done in nine cases using superficial temporal artery (STA) in eight and occipital artery (OA) in one case. Parent artery occlusion was performed with clipping in 9 patients, with coiling in 4, and with balloon plus coil in 1. Direct aneurysm clip was done in one case. The follow up period ranged from 2 to 48 months (mean 15.0 months). There was no mortality case. The long-term clinical outcome measured by Glasgow outcome scale (GOS) showed good or excellent outcome in 13/15. The overall surgery related morbidity was 20% (3/15) including 2 emergency bypass surgeries due to unexpected parent artery occlusion during direct clipping procedure. The short-term postoperative bypass graft patency rates were 100% but the long-term bypass patency rates were 86.7% (13/15). Nonetheless, there was no bypass surgery related morbidity due to occlusion of the graft. Conclusion : Revascularization technique is a pivotal armament in managing complex aneurysms and scrupulous prior planning is essential to successful outcomes.

• Korean Journal of Head & Neck Oncology
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• v.14 no.2
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• pp.169-174
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• 1998

Background: To avoid the major mobidity associated with bilateral radical neck dissection, modified radical neck dissection has become established as an effective adjunctive procedure in the management of head and neck cancer. But several studies reported early postoperative internal jugular vein(IJV) occlusion in patients who underwent modified radical neck dissection. Objectives: To determine internal jugular vein patency following modified radical neck dessection performed in various head and neck cancer and to identify factors associated with venous occlusion. Materials and Methods: From Aug. 1996 to Oct. 1997, twenty three patients underwent either unilateral or bilateral modified radical neck dissection; 19 males and 4 females, ranging in age from 28 to 75 were retrospectively examined. All patients had a preoperative doppler imaging or CT or both for their initial evaluation. A follow-up examination was obtained(after a minimum postoperative period of 2 months and a maximum one of 4 months). Results: Thirty-four IJVs were examined. All but six IJVs examined were found patent postoperatively. The preservation rate of patency of the IJV in modified radical neck dissection was found to be high(28 of 34 IJVs or 82%). Conclusion: The preservation rate of patency of the IJV in modified radical neck dissection was found to be high. These results favor the use of modified radical neck dissection for IJV preservation, particularly in bilateral neck dissection. A retrospective chart review revealed that trauma of the vessel and extrinsic compression of the vein by the musculocutaneous flap or recurrent carcinoma in the neck may be the cause of the vein occlusion.

• Journal of Dental Rehabilitation and Applied Science
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• v.23 no.2
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• pp.145-155
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• 2007

The advent of osseointegration and advances in biomaterials and techniques have contributed to increased application of dental implants in the restoration of maxillary partial edentulous patients. Often, in these patients, soft and hard tissue defects result from a variety of causes, such as infection, trauma, and tooth loss. These create an anatomically less favorable foundation for ideal implant placement. Reconstruction of the atrophic maxillary alveolar bone through a variety of regenerative surgical procedures has become predictable; it may be necessary prior to implant placement or simultaneously at the time of implant surgery to provide a restoration with a good long-term prognosis. Regenerative procedures are used for horizontal and vertical ridge augmentation. Many different techniques exist for effective bone augmentation. The approach is largely dependent on the extent of the defect and specific procedures to be performed for the implant reconstruction. It is most appropriate to use an evidenced-based approach when a treatment plan is being developed for bone augmentation cases. The cases presented in this article clinically demonstrate the efficacy of using a autogenous block graft, guided bone regeneration, ridge split, immediated implant placement technique on the atrophic maxillary area.

• Journal of Dental Rehabilitation and Applied Science
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• v.28 no.3
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• pp.309-318
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• 2012

In advanced stages of periodontal disease, a lot of the periodontal tissue support are usually lost. The tissue destruction around some teeth is progressed to a level which requires either spontaneous exfoliation or extraction of several teeth due to their excessive mobility. In such cases, a comprehensive treatment plan encompassing the adequate periodontal and maintenance therapy, as well as perio-prosthetic treatment involving occlusal equilibration, is needed in order to restore health, function, and esthetics. Cross-arch fixed partial dentures(CAFPDs), one of the perio-prosthetic treatments, are used to stabilize the teeth with severely reduced periodontal tissue support. Unfortunately, however, a little is known about the occlusal scheme and biomechanical concept of CAFPDs. This paper will demonstrate summaries of the trauma from occlusion(TFO), Ante's law revisited, the treatment principles, the role of occlusion, and the long-term consequences for CAFPDs, and the possibility of CAFPDs through a case presentation.