• Maxillofacial Plastic and Reconstructive Surgery
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• 제20권3호
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• pp.207-213
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• 1998

Purpose : This study attempted to relate the incidence of fractures at the mandibular angle with the presence and state of eruption of lower third molars, and to find out the real risk factors for angle fractures in the states of lower third molars. Materials and Methods : Medical records and radiographs of 395 patients with mandibular fractures were retrospectively reviewed. The presence and states of third molars were assessed for each patients and related to the occurrence of angle and other mandibular fractures. Results : Of 395 patients with mandibular fractures, 142 had angle fractures. The incidence of angle fractures was found to be significantly greater when partial erupted lower third molars were present and it had a definite role for risk factors for angle fractures. But there were no clear relationship between the incidence of angle fracrtures and states of without, fully erupted lower third molars. Furthermore, the states of patial and unerupted lower third molar had an effect on bony segment displacement. Conclusions : This study provides clinical evidence to suggest that patial erupted third molar teeth weaken the mandibular angle both quantitatively and qualitatively.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제32권1호
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• pp.81-85
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• 2010

Multiple jaw cysts are one of the most constant features of the basal cell nevus syndrome. Basal cell nevus syndrome is inherited as an autosomal dominant trait with variable expressiveness. This syndrome comprises a number of abnormalities such as multiple nevoid basal cell carcinomas of the skin, skeletal abnormalities as bifid rib and fusion of vertebrae, central nervous system abnormalities as mental retardation, eye abnormalities with multiple jaw cysts. The odontogenic keratocysts in patients with this syndrome are often associated with the crowns of unerupted teeth and huge size; on radiographs they may mimic dentigerous cysts. The most important feature of the cyst is its extraordinary recurrence rate. Since recurrence may be long delayed in this lesion, follow-up of any case of odontogenic keratocyst with roentgenograms and clinical examination of basal cell carcinoma are essential for at least five years after surgery. We report the result of 7-year follow up after cyst enucleation associated with basal cell nevus syndrome with the literature of review.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제23권4호
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• pp.332-337
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• 2001

An odontoma is a slow growing and nonaggressive odontogenic tumor composed of enamel, dentin, cementum, and pulp tissue. The etiology of odontomas is unknown, although local trauma, infection, and genetic factors have been suggested. Odontomas are classified as compound odontoma or complex. A 20-year retrospective study was performed on 36 odontomas from the files of the Department of Oral Pathology at Chosun University School of Dentistry. Fifty-six percent of the patients were compound odontoma and 44% were complex odontoma. 56 percent of the patients were female and 44% were male. The odontoma is most often diagnosed in the second decade of life, during routine radiographic examination. The usual presenting symptoms are an impacted or and unerupted tooth, a retained primary tooth. Other less frequent signs and symptoms are pain, swelling, suppuration, foul odor, tooth mobility. In our patients were treated by enucleation of the tumor, and related teeth were treated by surgical extraction or orthodontically assisted eruption.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제29권3호
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• pp.250-254
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• 2007

Dentigerous cysts are the most common type of developmental odontogenic cysts. They form as a result of a separation of the follicle from around the crown of an unerupted tooth. Usually this lesion can be asymptomatic. Such cysts are often discovered accidently on inspection of x-rays. In other advanced cases, cortical bone expansion, displacement of teeth, secondary infection can be observed. The treatment of dentigerous cyst is enucleation. And according to size, location of lesion and environmental structure marsupialization can be considered. However, Marsupialization takes long treatment time and, cystic tissues are remained so secondary surgery may be needed for total removal., Risks of oroantral fistula, damage on maxillary sinus wall and infraorbital nerve can be considered as complications of conventional surgical treatment of cysts located in maxillary sinus. We treated third molar origin dentogerous cyst located in maxillary sinus removing endoscopically both the tooth and an associated dentigerous cyst. We report our clinical experience with literature review.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권6호
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• pp.342-345
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• 2015

Adenomatoid odontogenic tumor (AOT) is a rare, benign odontogenic tumor that predominantly appears in the second decade of life in female patients. Most AOTs occur in the anterior part of the maxilla and are usually associated with impacted anterior teeth. There are three types of AOT, follicular, extrafollicular, and peripheral, which are classified based on the location of the lesion and its association with the impacted tooth. We report a rare case of AOT associated with an impacted right mandibular lateral incisor in an 11-year-old female patient.

• 대한소아치과학회지
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• 제28권1호
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• pp.175-179
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• 2001

국소적 치아 이형성증이란 드물게 나타나는 치아발육장애로서 치아발육이 국소적으로 정지되어 발생되며 이환된 치아의 모든 구성요소가 발육부전이나 석회화 부전을 나타낸다. 국소적 혈액 순환 장애, 체성 돌연변이. 바이러스 침투, 치배 감염, 치아 외상, 이상고열, 방사선조사, 영양, 대사 장애, 유전 등이 원인으로 제시되고 있으나 정확한 원인은 밝혀져 있지 않다. 여성에 많이 발생하고(1.4 : 1) 하악보다는 상악(특히 좌측)에 많이 나타나는 것으로 보고되고 있다. 이환 받은 치아는 크기가 작고, 저형성을 보이며, 노란색 또는 노란 갈색을 띄고, 소와와 구(pitting & grooving)를 보이기도 한다. 방사선적으로 "ghost like appearance" "fuzzy appearance"등을 보이고 치수강 내에 치수석회화물이나 상아질석이 보이기도 한다. 본 증례의 2세 남자 환아는 하악 우측 치아의 맹출 지연을 주소로 연세대학교 병원 소아치과에 내원하였다. 하악 우측 유중 절치의 부분 맹출과 유측절치, 유견치, 제 1유구치가 미맹출을 보였고, 방사선 검사소견에서 해당부위의 치아는 "Ghost like appearance"와 짧은 치근, 개방된 치근첨의 소견이 관찰되었다. 임상, 방사선 검사결과 국소적 치아 이형성증으로 판단되어 이에 대한 보고를 하는 바이다.

• 대한치과교정학회지
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• 제18권2호
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• pp.407-420
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• 1988

제1 대구치까지 맹출완료된 정상군(109명 : 남자65명, 여자44명)과 밀집군 (85명 : 남자 42명, 여자43명)의 치열모형상에서 치아폭경을 계측하여 남녀간, 그리고 밀집군과 정상군간에 상악 및 하악의 영구 절치의 근원심 폭경합과 상악 및 하악의 편측 영구 견치 및 소구치의 근원심 폭경 합의 관계를 연구하여 다음과 같은 결론을 얻었다. 정상군과 밀집군에서 상악 및 하악의 영구 절치의 근원심 폭경 합에 대한 상악 및 하악의 편측 영구 견치 및 소구치의 근원심 폭경합의 비율은 남여간에 유의한 차가 없었다. 하악 영구 절치의 근원심 폭경합에 대한 하악의 편측 영구 견치 및 소구치의 근원심 폭경합의 비율은 정상군과 밀집군간에 유의한 차가 없으나 상악의 편측 영구 견치 및 소구치의 근원심 폭경합의 비율은 두 군간에 유의한 차가 있었다. 상악 영구 절치의 근원심 폭경합에 대한 상악 및 하악의 편측 영구 견치 및 소구치의 근원심 폭경합의 비율은 정상군과 밀집군간에 유의한 차가 있었다. 정상군과 밀집군에서 상악 및 하악의 영구 절치의 근원심 폭경합을 이용하여 상악 및 하악의 편측 영구 견치 및 소구치의 근원심 폭경합에 대한 최소자승법에 의한 회귀방정식을 산출하고 각의 백분률표를 작성하였다.

• 대한소아치과학회지
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• 제34권3호
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• pp.481-489
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• 2007

상악 견치의 매복은 임상에서 종종 관찰되며 인접치의 치근을 흡수하거나 낭종을 형성하는 등 여러 문제점을 유발한다. 매복 치아의 치료는 치근단의 완성 정도, 치아 매복의 방향과 위치, 맹출 공간의 존재 여부, 매복치 주변의 과잉치, 치아종, 낭종 등의 존재 여부 등에 따라 발치, 교정적 견인, 외과적 자가이식 등의 술식이 결정된다. 자가이식은 치아의 위치가 교정력을 가할 수 없는 위치에 존재하거나 치아 이동이 제한을 받게 되어 통상적인 치료가 불가능할 경우에 발거에 앞서 고려할 수 있으며, 자가이식의 예후는 치주인대의 보존, 치근의 완성도, 외과적 술식, 환자 연령, 근관치료 시기, 치아고정 기간 및 형태와 구강외 저장 용액 등에 의해 결정된다. 본 증례들은 영구 치열기 말기에 상악 견치 매복으로 내원하였고 그 매복 위치가 자발적인 맹출 유도나 교정적 견인 및 배열이 어렵다고 판단되었다. 따라서 자가이식과 근관치료를 시행하고 주기적인 관찰 중이다.

• 대한소아치과학회지
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• 제35권4호
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• pp.718-724
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• 2008

치아 매복은 어린이 환자 진료 시에 자주 관찰되는 맹출 장애이다. 어린 환자에서 매복된 치아가 존재하는 경우, 함치성 낭과 연관이 있을 가능성이 높다. 함치성 낭은 제3대구치를 제외하고는 상악 견치, 하악 소구치 부위에서 가장 호발하며, 점진적인 증식으로 악골이 팽윤되어 안모를 변화시키며, 주위 악골의 파괴와 치근의 흡수를 야기하거나 침범된 치아의 변위를 유발할 수 있으므로, 조기 진단과 적절한 치료가 무엇보다도 중요하다. 함치성 낭과 연관된 치아가 과잉치나 지치라면, 치아의 발거를 포함한 완전한 낭종 적출술이 적절한 치료라 할 수 있지만, 그렇지 않은 경우에는 환자의 심리적, 정신적 외상을 예방하기 위해 원인 치아의 보존이 고려되어야 할 것이다. 이뿐만 아니라, 치아의 변위 정도, 골 파괴 정도, 치근의 성숙도, 주위 치아와의 관계, 환자의 교합과 구강 악안면 영역의 성장 양상 등도 같이 고려되어야 할 것으로 생각된다. 본 증례에서는 위와 같은 사항들을 고려하여, 함치성 낭과 연관된 매복 소구치와 대구치를 낭종 적출술 후 공간 유지, 외과적 수술과 교정적 견인, 외과적 발거 후 교정적 배열 등의 방법을 통해 양호한 치료 결과를 얻었기에 보고하는 바이다.

• 대한치과보철학회지
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• 제45권1호
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• pp.1-11
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• 2007

Statement of problems: The concept of CR has also changed continuously.?In order to find out the factors that affect the centric slide, studies were carried out to compare the forms of wisdom teeth eruption, lateral movement, premature contact in CR, and anterior movement. Research and statistical methods were based on the report by the 1980 Korean dental association. Material and method: In our study, 403 dentists in their twenties and dentistry students who could understand CR and CO (and who did not receive occlusal, orthodontic treatment, without extreme caries and large prosthodontic care) were compared with the 25 year old results. A segment of line parallel to the upper incisor was marked on the lower incisor. When seen laterally, a line perpendicular to the occlusal plane was drawn on the foremost area of the upper incisor. This line was extended to the lower incisor and the two points (points at the lower and upper incisors) were used as reference points for the CO. After guiding the occlusion to the CR, two lines were marked by using the same method that was used for the CO. The point in which these lines meet became the reference point of CR occlusion Results and conclusions: Results of the experiment completed in 1980 show that all 307 research members had anterior-posterior and upper-lower displacement. Displacement measurements were $0.7{\pm}0.4mm$ for the anterior-posterior displacement, $0.99{\pm}0.50mm$ for the upper-lower displacement,0.18{\pm}0.31 mm for the lateral displacement, and $1.32{\pm}0.67mm$ for the total displacement. Results of the 2006 experiment show that all 409 research members had anterior-posterior and upper-lower displacement. The anterior-posterior displacement was $1.12{\pm}0.86mm$, the upper-lower displacement was $1.02{\pm}0.71mm$, the lateral displacement was $0.61{\pm}0.56mm$, and the total displacement was $1.80{\pm}0.99mm$. No specific differences were found between each group when comparing displacement according to the forms of wisdom teeth eruption. Since 1980, the percentage of unerupted teeth has increased from 35.16% (111/307 people) to 57.5% (236/409 people). Westernization of the Korean cranial form and intraoral structure has brought about these results. In our experiment, 26.7% (109/409 people) of the subjects were cuspid guided, while 7.3% (30/409 people) were mutually guided. No specific differences were found in the amount of displacement between the two groups. Only the subjects with anteriors coming in contact made up the largest percentage group (42.3%, 173/409 people) in our study. No specific differences were found between each group.