• Maxillofacial Plastic and Reconstructive Surgery
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• 제20권2호
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• pp.112-126
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• 1998

In dentistry, bony defects can be formed by cyst, tumor, inflammation, trauma and surgery in maxilla and mandible. If the overlying soft tissue invades and preoccupies the jaw bony defects, regenerated bony tissue same as adjacent bone can not replace whole space of the defects, thus preventing osteogenesis from occurring. Guided bone regeneration(GBR) is based on the prevention of overlying soft tissue from entering the bony defect during the initial healing periods. E-polytetrafluoroethylene(e-PTFE) is one of an effective and widely used barrier membrane for GBR, but it has the disadvantages such as surgical removal and high price. To overcome such disadvantages of e-PTFE, many investigators have proposed various absorbable barrier membranes. Inexpensive oxidized cellulose($Surgicel^{(R)}$) membrane was shown to have potential for use as an absorbable barrier membrane for regenerative procedure and it would not require surgical removal. The purpose of this study is to investigate the absorption periods of oxidized cellulose at the implant site and usefulness as a mechanical barrier, preventing the ingrowth of the overlying soft tissue into the bony defects. Two bony defects were made in each tibia of a dog using drill and one defect covered with oxidized cellulose and the other covered with periosteum directly as control. The experimental animals were sacrificed at 1st-7th, 10th, 14th, 21th, 28th day postoperatively, Inspection of the specimens was done to evaluate gross changes. Specimens were examined histopathologically by hematoxylin-eosin and Masson's trichrome staining under light microscope. The results were as follows : 1. There was no significant differences of inflammatory reaction between the experimental and the control group. 2. The resorption of oxidized cellulose was almost completed within 14th day. 3. Histologically, bone formation in the experimental group was somewhat more than that of the control group at 10th, 14th, 21th and 28th day postoperatively. The bone forming pattern of the experimental group was more regular than that of the control group. 4. There was no evidence of soft tissue invasion into the bony defect in the experimental group. In conclusion, oxidized cellulose membrane might be used as an alternative absorbable barrier membrane to prevent overlying soft tissue invasion into the bony defects.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권4호
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• pp.679-700
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• 1996

Inferior alveolar nerve dysfunction may be the result of trauma, disease, or iatrogenic injury. Inferior alveolar nerve injury is inherent risk in endodontic therapy, orthognathic surgery of the mandible, and extraction of mandibular teeth, particularly the third molars. The sensory disturbances of inferior alveolar nerve associated with such injury have been well documented clinical problem that is commonly evaluated by several clinical sensory test including Tinels sign, Von Frey test(static light touch detection), directional discrimination, two-point discrimination, pin pressure nociceptive discrimination, and thermal test. These methods used to detect and assess inferior alveolar nerve injury have been subjective in nature, relying on the cooperation of the patients. In addition, many of these techniques are sensitive to differences in the examiners experience and skill with the particular technique. Data obtained at different times or by different examiners are therefore difficult to compare. Prior experimental studies have used electro diagnostic methods(sensory evoked potential) to objectively evaluate inferior alveolar nerve after nerve injury. This study was designed with inferior alveolar nerve of rabbit. Several types of injury including mind, moderate, severe compression and perforation with 19 gauze, 21 gauze needle and 6mm, 10mm traction were applied for taking the sesory evoked ppterntial. Latency and amplitude of injury rabbit inferior alveolar nerve were investigated with sensory evoked potential using unpaired t-test. The results were as follows : 1. Intensity of threshold (T1) was $128{\pm}16{\mu}A$ : latency, $0.87{\pm}0.07$ microsecond : amplitude, $0.4{\pm}0.1{\mu}V$ : conduction velocity, 23.3 m/s in sensory evoked potential of uninjured rabbit inferior alveolar nerve. 2. Rabbit inferior alveolar nerve consists of type II and III sensory nerve fiber. 3. Latency was increased and amplitude was decreased in compression injury. The more injured, the more changed in latency and amplitude. 4. Findings in perforation injury was similar to compression injury. Waveform for sensory evoked potential improved by increasing postinjured time. 5. Increasing latency was prominent in traction injury rabbit inferior alveolar nerve. 6. In microscopic histopathological findings, significant degeneration and disorganization of the internal architecture were seen in nerve facicle of severe compression and 10mm traction group. From the above findings, electrophysiological assessment(sensory evoked potential) of rabbit injured inferior alveolar nerve is reliable technique in diagnosis and prognosis of nerve injury.

• 대한소아치과학회지
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• 제35권1호
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• pp.175-180
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• 2008

치아 및 치조골은 복합적인 구조이므로 치아의 함입이나 측방 탈구와 같은 치조와의 변위가 있는 다수 치아를 포함한 외상에서 치조골 골절이 동반될 수 있다. 치조골이 골절되면 치주인대 및 치수로의 혈행이 단절되어 치아의 합병증을 유발할 수 있고, 특히 유치열기 외상은 후속 영구치배에 손상을 줄 가능성이 있으므로 장기간의 관찰이 필요하다. 치아 및 치조골 골절의 치료 시에는 환자의 연령과 외상의 위치 및 범위, 유치의 변위 정도 및 방향을 고려해야하며, 골절편을 재위치 시키고 고정하기 위하여 아치바(arch bar), 레진-강선 고정, 교정용 밴드, 아크릴 또는 금속 캡 스플린트(acrylic or metal cap splint), 화이버 스플린트(fiber-splint) 등의 다양한 방법이 고안되었다. 본 증례는 외상으로 인하여 치조골이 골절되어 내원한 1세 11개월 된 환아로서 모형상에서 레진-강선 오픈 캡 스플린트(resin-wire open cap splint)를 제작하여 고정한 후 양호한 치료 결과를 얻었다. 이 방법은 부가적인 기공 과정이 필요하지만, 유치열기에서 사용할 수 있고, 시술시간이 짧아 비협조적인 환아에게 진정요법 없이 적용할 수 있으며, 일반적인 아크릴 캡 스플린트에 비해 부피가 작아 불편감이 적고, 교합을 방해하지 않으며, 접착시 시멘트가 빠져나갈 공간이 있어서 스플린트의 정확한 안착이 가능하다. 또한 비교적 통증이 적으며 침습적이지 않아 출혈이 없으므로 의과적문제가 있는 경우에도 사용할 수 있다.

• 구강회복응용과학지
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• 제25권4호
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• pp.329-336
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• 2009

선천적 기형이나 후천적인 외상 또는 신생물에 의해 상악골 절제술을 받은 경우, 상악에서 발생하는 구강내 결손은 흔히 비강과 상악동 및 구강이 연결된 형태로 나타난다. 이러한 상악골의 결손은 구강과 비강이 교통되어 발음, 저작, 연하 등의 기능에 이상을 초래하게 된다. 이러한 경우에도 보철치료의 기본적인 목표가 적용되며, 후천적 상악 결손부에 수복되는 폐색장치는 발음, 연하, 저작 기능을 회복할 수 있어야 하고, 적절한 심미적 만족을 제공해야 하며, 환자가 편안하게 사용할 수 있어야 한다. 상악 폐색장치의 무게를 감소시키는 것은 잔존 조직의 건강과 정상적인 기능 및 환자의 안락함을 개선시킬 수 있다. 개방형 폐색장치는 결손부의 크기에 따라 6.55~33.06% 까지 무게를 줄여줌으로써 환자에게 편안함과 편의성을 제공해 주며, 생리적 기능을 향상시켜 치아와 지지 조직에 불필요하게 가해지는 부하를 감소시켜 준다. 본 증례는 hemi-maxillectomy를 시행한 환자에서 이중온성법을 이용하여 기존의 방법보다 더 균일한 의치상 두께를 가진 폐색장치를 제작하여 환자의 기능적, 심미적인 만족을 얻었기에 이를 보고하는 바이다.

• Archives of Plastic Surgery
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• 제39권4호
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• pp.301-308
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• 2012

In the treatment of mandibular condyle fracture, conservative treatment using closed reduction or surgical treatment using open reduction can be used. Management of mandibular condylar fractures remains a source of ongoing controversy in oral and maxillofacial trauma. For each type of condylar fracture,the treatment method must be chosen taking into consideration the presence of teeth, fracture height, patient'sadaptation, patient's masticatory system, disturbance of occlusal function, and deviation of the mandible. In the past, closed reduction with concomitant active physical therapy conducted after intermaxillary fixation during the recovery period had been mainly used, but in recent years, open treatment of condylar fractures with rigid internal fixation has become more common. The objective of this review was to evaluate the main variables that determine the choice of an open or closed method for treatment of condylar fractures, identifying their indications, advantages, and disadvantages, and to appraise the current evidence regarding the effectiveness of interventions that are used in the management of fractures of the mandibular condyle.

• 대한치과마취과학회지
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• 제10권2호
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• pp.190-196
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• 2010

Difficult airway management including difficult intubation, difficult ventilation and difficult mask ventilation is a life threatening issue during anesthesia care. A 23-year-old woman with Treacher Collins syndrome was scheduled for distraction osteogenesis. She had hypoplasia of mandible and malar bone, bilateral deformities of auricles with partial deafness and antimongoloid slant of the palpebral fissures. A 56-year-old woman with mandibular hypoplasia due to childhood trauma was scheduled for distraction osteogenesis. She had a history of difficult intubation. We anticipated a difficult intubation and ventilation. Fiberoptic bronchoscopic guided awake intubation was selected for anesthesia induction. After intravenous injection of midazolam and remifentanil, 10% lidocaine pump spray on the pharyngolarynx with a direct laryngoscope and on the nasal canal. However fiberoptic bronchoscopic guided awake intubation was failed due to severe gag reflex. After intravenous injection of propofol and remifentanil using the target controlled infusion (TCI), mask ventilation was easily performed and, after intravenous injection of vecuronium, fiberoptic bronchoscopic guided intubation was easily performed using a wire reinforced endotracheal tube. The operation was completed successfully without any adverse events.

• 대한치과의사협회지
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• 제48권4호
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• pp.275-279
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• 2010

Dental implant restoration in partial or full edentulous state has become the standard treatment in recent years. Bone graft with guided bone regeneration technique has been regarded as one of the most reliable methods to restore the bone defect area due to periodontal disease or dental trauma. Bone graft materials and membrane are the essential component of guided bone regeneration; however, a variety of bone graft materials confuse us in implant dentistry. Autogenous bone is the recognized standards in implant dentistry owing to its osteogenesis potential. Despite of its disadvantages, grafting autogenous bone is the most reliable methods. Even though the development of new bone grafts materials, autogenous bone is useful in exposed implant thread and total lack of buccal or lingual bone. Allogenic, xenogenic and synthetic bone have the osteoconductive and osteoinductive potential. These materials could be used successfully in self-contained cavity such as sinus cavity and three-wall defects. In this article, application of bone graft material is suggested according to the function of bone graft materials.

• Imaging Science in Dentistry
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• 제50권4호
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• pp.365-371
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• 2020

While silent sinus syndrome (SSS) is familiar to otolaryngologists and ophthalmologists, it is a rare clinical entity in dentistry and is likely to be underdiagnosed due to dentists' lack of awareness of this condition. SSS presents a diagnostic challenge to dentists, as patients typically have no history of trauma or sinusitis. The characteristic feature of SSS is a gradual retreat of the maxillary sinus walls, resulting in enophthalmos and hypoglobus. Multidetector (multislice) computed tomography is the imaging modality of choice for SSS and other paranasal sinus diseases. Cone-beam computed tomography promises to be an alternative low-dose imaging modality. This report describes 3 cases of SSS in adults, who had no identified clinical symptoms except diminutive and opacified maxillary sinuses, as well as the inward bowing of the sinus walls as noted on cone-beam computed tomographic imaging.

• 대한치과교정학회지
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• 제54권3호
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• pp.185-195
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• 2024

Objective: This study aimed to retrospectively analyze the prevalence of orthodontic problems and the proportion of patients who underwent orthodontic diagnosis among children aged 6 (n = 300), 7 (n = 400), and 8 (n = 400) years who had undergone panoramic radiography. Methods: Children were divided into five groups according to their chief complaint and consultation: conservative dentistry, oral and maxillofacial surgery, orthodontics, periodontics, and prosthodontics). Chief complaints investigated included first molar eruption, lack of space for incisor eruption, frequency of eruption problems, lack of space, impaction, supernumerary teeth (SNT), missing teeth, and ectropion eruption. The number of patients whose chief complaint was not related to orthodontics but had dental problems requiring orthodontic treatment was counted. The proportion of patients with orthodontic problems who received an orthodontic diagnosis was also examined. Results: Dental trauma and SNT were the most frequent chief complaints among the children. The proportion of patients with orthodontic problems increased with age. However, the orthodontic diagnosis rates based on panoramic radiographs among children aged 6, 7, 8 years were only 1.5% (6 years) and 23% (7 and 8 years). Conclusions: Accurate information should be provided to patient caregivers to correct misconceptions regarding the appropriateness of delaying orthodontic examination until permanent dentition is established.

• 대한소아치과학회지
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• 제32권3호
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• pp.403-408
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• 2005

치아유착은 치근의 상아질 또는 백악질이 치조골과 융합된 것으로 치아의 맹출이상을 야기하여 치조골 성장의 장애를 일으킨다. 본 6세 여아는 유구치의 유착과 영구 소구치의 결손을 주소로 본과에 의뢰되었으며 특이할 만한 의과적, 치과적 병력은 없었다. 구강 검진 소견상 상, 하악의 좌, 우측 유구치에서 저위교합이 관찰되었으며, 다수의 치아우식증이 존재하였다. 방사선 사진 검사 소견상 상악의 좌, 우측 영구 견치와 계승 소구치의 결손, 상악 유구치의 치근흡수와 하악 유구치의 치주인대공간의 소실 및 미약한 치근흡수가 관찰되었다. 계승 영구치의 결손을 동반한 유구치 유착시 치료목표는 적절한 치조골 성장과 유치의 유지이며, 유착의 발현 시기와 치근의 흡수 정도에 따라 관찰, 수복 또는 발치 등의 치료를 고려할 수 있다. 유착치아의 발치는 인접 치조골 성장에 문제가 없고 인접치의 경사가 일어나지 않도록 최대성장점(growth spurt)을 고려하여 그 시기를 결정해야 한다.