• 대한치과보철학회지
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• 제32권2호
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• pp.235-248
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• 1994

There were many studies that distribute the partial edentulous states and examine the removable partial denture designs in the planning of removable partial denture treatment. This study was performed in the point of removable partial denture prescription to evaluate partial edentulism and its removable partial denture designs. The data was collected from the dental laboratory of each three dental colleges in Seoul and from two dental laboratories only for removable partial dentures as a prescription form. A total of 1411 cases with prescription form collected from dental laboratories were distributed for this study, then 788 cases were selected for this study. The case selection was done according to the contents of prescription form. The selected cases were divided into maxillary arch and mandibular and classified in terms of types of major connector and direct retainer, unbroken anterior teeth, Kennedy classification, the number of remaining teeth, and distribution of age and sex. The analyzed results were as follows : 1. The Kennedy classification I showed highest frequency both in maxilla and mandible. 2. The arch distribution of removable partial denture was 50.08% for maxilla and 49.92% for mandible. 3. The highest frequency in the distribution of direct retainer was the RPA clasp design. 4. The frequency of unbroken anterior 6 was 73.36% for maxilla and 82.30% for mandible. 5. The design of broad palatal strap and lingual bar revealed the highest prevalence in the major connector construction. 6. The mean number of remaining teeth per arch was 8.25 for maxilla and 8.37 for mandible. 7. The mean age of the patients supplied with removable partial denture was 52.25 years for men, 51.68 years for women, 52.11 years for maxilla, and 51.76 years for mandible and women showed more prevalence.

• 구강회복응용과학지
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• 제25권3호
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• pp.255-265
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• 2009

즉시 하중에 대한 관심과 시도가 증가되고 있지만, 명확한 술식이 정립되어 있지는 않다. 본 연구에서는 상악 전치부 임플란트에서 즉시 하중시에 골과 임플란트에 나타나는 응력분포 양상을 3차원 유한요소법을 이용하여 알아보고자 하였다. 골질이 D3인 상악 전치부의 골모형을 구성하고, 서로 다른 길이(8.5 mm, 10.0 mm, 11.5 mm, 13.0 mm, 15.0 mm)의 직경 4.0 mm 나사형 임플란트를 식립한 모형을 제작하였다. 해석 절차의 간소화를 위하여 모든 물성은 등방성, 선형탄성, 균질성으로 가정하였다. 골-임플란트 계면은 접촉 요소법으로 처리하여 골유착이 일어나기 전 상태로 구성하였다. 지대주 장축에 120도의 각도로 지대주의 구개 절단각 중앙부에 176 N의 정하중을 가하고 응력분포를 관찰하였다. von Mises stress를 이용하여 응력을 분석한 결과 모든 모형에서 순측 피질골에 응력이 집중되었으며 피질골과 망상골의 경계부에서 최대 응력값을 나타내었다. 길이에 따른 비교시 8.5 mm 모형에서 가장 큰 최대 응력값을 나타냈으며, 임플란트 길이가 증가될수록 좀 더 양호한 응력 분포를 나타내었다. 상악 전치부 즉시 하중시에 피질골의 존재 유무는 매우 중요하며, 길이가 긴 임플란트를 식립하는 것이 유리하며, 가능하면 13.0 mm 이상의 임플란트를 식립하는 것이 즉시하중을 시행할 때 응력 분산에 유리한 것으로 판단된다.

• 치과방사선
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• 제24권1호
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• pp.129-135
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• 1994

This study was performed to evaluate the accuracy of orthopantomogram by measuring the actual and radiographic tooth length and by analyzing the vertical magnification rate. For this study, total 90 teeth of the maxilla and mandible teeth and a dry skull were used. This experiment was attached with metal balls of 1±0.02㎜ at the root and the crown cusp tips of central, 2nd premolar, 1st molar of the maxilla and mandible and the teeth were embedded in dry skull, and then orthopantomogram was taken. The obtained results were as follows: 1. The average of tooth length in orthopantomogram was longer than that of actual tooth length. 2. The average of vertical magnification rate in the orthopantomogram to actual tooth length was 17-26%. 3. Vertical magnification rate of the maxilla teeth was 18-26% and that of mandibular teeth was 17-23%, and the magnification of maxillary teeth was larger than that of mandible teeth(P<0.0l). 4. Vertical magnification rate of posterior area was 22-26% and that of anterior area was 17-18%, and the magnification of anterior area was less than that of posterior area(P<0.01).

• The Journal of Advanced Prosthodontics
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• 제13권2호
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• pp.117-125
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• 2021

PURPSE. The aim of this study was to evaluate the labio-lingual alterations of the alveolar bone where the implant was placed immediately after tooth extraction. MATERIALS AND METHODS. Implants were placed immediately after tooth extraction on anterior alveolar ridges in the maxilla and mandible. The pinguide system was used to help determine the location and path of implants during the surgical process. The horizontal distance from implants to the outer border of alveolar bone was measured at the rim and middle of the implants in the cone beam computed tomography images. The alteration of alveolar bone was evaluated comparing the horizontal distances measured immediately after surgery and 3 months after surgery. RESULTS. The results show that more resorption occurred towards the labial bone than the lingual bone in the maxilla. A similar amount of labial and lingual bone resorption was observed in the mandible. CONCLUSION. Considering the horizontal alteration of alveolar bone, labio-lingual positioning of the implant towards the lingual bone in the maxilla and at the center of the alveolar ridge in the mandible is recommended when it is placed immediately after tooth extraction.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제33권3호
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• pp.238-246
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• 2007

This study is aimed to elucidate the abnormal growth pattern of human fetal maxilla with cleft lip and palate (CLP). Total 71 fetal maxillae with CLP were obtained from aborted human fetuses. They were examined radiologically for the dimensional changes of maxillary trapezoid (MT) formed by maxillary primary growth centers (MxPGC)(Lee et al., 1992). In palatal radiogram of the CLP maxilla, the MT was traced by the anterior and posterior MxPGCs, and the dimensions of anterior and posterior maxillary widths, maxillary length, and MT length (MTL), and MT area were measured for evaluation of the basic growth pattern of the developing maxilla. The growth of anterior and posterior MxPGCs was severely retarded in the prenatal maxillae with CLPs, showing abnormal shape of MT. Cleft lip subjects without cleft palate also showed arrested growth of MT. Unilateral cleft lipalveolar cleft or cleft palate (UCL-AC/CP) and bilateral cleft lip-alveolar cleft or cleft palate (BCL-AC/CP) showed enhanced abnormal MT pattern. The abnormality of MT was most marked in BCL-AC/CP. It was also observed that the craniofacial malformations other than CLPs produced abnormal MT. In conclusion, the MT growth of prenatal CLP maxilla was severely arrested and resulting in abnormal MT shape on the palatal radiogram. BCL-AC/CP showed more protruded nasal septum than other types of CLPs, while UCL-AC/CP showed severe deviation of the protruded nasal septum towards the non-cleft side. Cleft lip only subjects also showed the abnormal growth of MT. These data suggest that the MT is primarily involved in CLPs, and MT shape could be utilized as a sensitive indicator for the analysis of maxillary malformation in different types of CLPs.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제32권1호
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• pp.77-80
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• 2010

Plasma cell myeloma is malignant disease of plasma cell in the bone marrow. Myeloma accounts for about 1% of all cancers. The solitary plasma cellmyeloma is rare tumors and account for less than 10% of plasma cell neoplasm. It is often progress to multiple myeloma at 30-40% despite successful local treatment with surgery and radiation therapy. We are reporting a case of solitary plasma cell myeloma on anterior maxillary region that developed after kidney transplantation and immunosuppressive therapy.

• 치과방사선
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• 제13권1호
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• pp.139-143
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• 1983

A 18-year-old man had a painless swelling in the right anterior portion of maxilla for 2 years. On radiographic examination, a radiolucent region that was not associated with an unerupted tooth was seen. Small scattered radiopaque foci were seen in the cystic lumen. At second case, a 16-year-old girl had a painless swelling in the anterior portion of maxilla for 3 years. On radiographic examination, a radiolucent region that associated with an unerupted tooth was seen. Multiple scattered radiopaque foci were seen in the radiolucent cystic lumen. With the patient under local anesthesia, well encapsulated tumors were enucleated. The diagnosis made in the pathologist's report was Adenomatoid Odontogenic Tumor, benign lesion often having distinct clinical and radiographic features.

• The Journal of Advanced Prosthodontics
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• 제9권3호
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• pp.238-238
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• 2017

• Maxillofacial Plastic and Reconstructive Surgery
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• 제38권
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• pp.21.1-21.6
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• 2016

Background: The Le Fort I osteotomy is one of the most widely used and useful procedure to correct the dentofacial deformities of the midface. The changes of the maxilla position affect to overlying soft tissue including the nasal structure. Postoperative nasal septum deviation is a rare and unpredicted outcome after the surgery. There are only a few reports reporting the management of this complication. Case Presentation: In our department, three cases of the postoperative nasal septum deviation after the Le Fort I osteotomy had been experienced. Via limited intraoral circumvestibular incision, anterior maxilla, the nasal floor, and the anterior aspect of the septum were exposed. The cartilaginous part of the nasal septum was resected and repositioned to the midline and the anterior nasal spine was recontoured. Alar cinch suture performed again to prevent the sides of nostrils from flaring outwards. After the procedure, nasal septum deviation was corrected and the esthetic outcomes were favorable. Conclusion: Careful extubation, intraoperative management of nasal septum, and meticulous examination of preexisting nasal septum deviation is important to avoid postoperative nasal septum deviation. If it existed after the maxillary osteotomy, septum repositioning technique of the current report can successfully correct the postoperative septal deviation.

• 대한심미치과학회지
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• 제10권1호
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• pp.8-15
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• 2001

The Class III malocclusion classified in two types of Skeletal Class III and Pseudo Class III. In the case of the maxillary deficiency, the protraction H-G(facemask) with Bonded RPE can be used. For children with A-P and vertical maxillary deficiency, the preferred treatment is to move the maxilla into a more anterior and inferior position, which also increases its size as bone is added at the posterior and superior sutures. Successful forward repositioning of the maxilla can be accomplished before age 8. To resist tooth movement as much as possible, the maxillary teeth should be splinted together as a single unit. The maxillary appliance must have hooks for attachment to the facemask that are located in the canine-primary molar area above the occlusal plane. The facemask usually worn until a positive overjet of 2-5mm is achieved interincisally. Occipital chin cup is successful in those patients who can bring their incisors close to an edge-to-edge position when in centric relation. This treatment is particularly useful in patients who begin treatment with a short lower anterior facial height, as this type of treatment can lead to an increase in lower anterior facial height. If the pull of the chin cup is directed below the condyle, the force of the appliance may lead to a downward and backward rotation of the mandible.