• 대한치과의사협회지
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• 제50권6호
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• pp.304-311
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• 2012

Eruption of the teeth can be disturbed by crowding, ectopic eruption path, retention for pathologic condition of follicle and periodontal ligament, local disturbances in the innervation, and delayed eruption for overlying obstacles in the eruption path. Eruption disturbance of permanent posterior teeth is taken with diverse therapeutic approaches according to the patient age, cooperation of patient, tooth position and maturity, degree of impaction, clinical features, and repercussion on the neighboring teeth. However, delayed treatment usually results in less favorable outcomes. Therefore, In order to prevent this situation, periodically radiographic examinations during the early mixed dentition period and early diagnosis of eruption disturbances of permanent posterior teeth are recommended.

• 대한소아치과학회지
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• 제45권4호
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• pp.514-520
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• 2018

유치의 선천적 결손은 흔하지 않으며, 특히 유견치의 선천적 결손은 드물다. 일반적으로 선천적 결손에 따른 후속 영구치에 미치는 영향으로 후속 영구치 또한 선천적 결손 되거나, 발육 시기에 영향을 주는 경우가 보고되어졌다. 본 증례는 상악 유견치의 선천적 결손을 지닌 2명의 환아에게서 각각 4세, 6세경 영구 견치가 조기 맹출 된 증례가 있어 보고하였다. 이러한 조기 맹출이 일반적이지 않더라도, 발생 시에 환자는 공간과 관련된 문제가 발생할 수 있으며 좀 더 주의 깊은 구강위생 관리가 필요하다. 이에 본 증례를 통하여 유견치 선천적 결손 후 후속 영구치의 조기 맹출 가능성에 대하여 보고하는 바이며, 조기맹출 시 발생할 수 있는 문제점과 관련하여 임상가들은 주의 깊은 관찰이 필요하다.

• 대한소아치과학회지
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• 제34권1호
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• pp.13-18
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• 2007

맹출 중인 치아는 오랜 기간 동안 이동하는 과정에서 주위의 여러 요인들, 즉 유치의 조기 상실, 과잉치, 국소적 병소, 혀, 입술, 저작근, 외상 등에 의해서 다양한 영향을 받을 수 있다. 이러한 여러 요인들이 작용할 경우 치아의 정상적인 맹출 과정이 방해를 받게 되어 치아의 맹출 장애를 초래할 수 있다. 본 연구에서는 서울대학교 치과병원 소아치과에 2004년 1월 2일부터 2005년 12월 31일까지 신환으로 내원한 환자들, 총 8,010명의 주소를 분석하였고, 맹출 장애를 보이는 환자는 전체의 8.79%를 보였다. 맹출 장애의 유형은 맹출 지연이나 조기 맹출, 이소 맹출로 분류할 수 있었고, 맹출 지연이 가장 많이 나타난 치아는 상악 중절치이며, 조기 맹출이 호발한 치아는 하악 유중절치이고, 이소 맹출이 가장 많이 나타난 치아는 상악 제1대구치였다.

• 대한치과교정학회지
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• 제23권1호
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• pp.47-55
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• 1993

This study was designed to recognize the factors which can affect the normal eruption of the lower third molar and the eruption rate of the lower third molar in the cases of non-extraction and the extraction of first premolar. The sample consisted of 214 cases of extraction of first premolar and 119 cases of non-extraction, and all of these cases were divided into erupted and impacted lower third molar groups and were analized according to the pantomogram. The results of the study were as follows : 1. The eruption rate of the touter third molar was $54.67\%$ in the group of extraction of the first premolar and $35.29\%$ in the non-extraction group. 2. The early inclination of the erupting lower third molar has significant effect in the eruption of it. 3. In the orthodontic treatment, the extraction of first premolar is one of the factors infuencing the nomal eruption of lower third molar. 4. The available space for the normal enruption of lower third molar was greater in first premolar extraction case than in non-extraction case.

• 대한소아치과학회지
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• 제6권1호
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• pp.53-63
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• 1979

To Study the eruption pattern of the mandibular second permanent molar, the author took 425 cases of Oblique Cephalogram from 6 to 13 years old children and observed the vertical and mesiodistal directional change and tooth axis change. The following results were obtained. : 1. The eruption pattern of the mandibular second permanent molar was changed at about 10.0~10.1 ages or calcification stage IX. 2. At the early stage, the path of eruption of the mandibular second parmanent molar directed upward and forward and after calcification stage IX it changed to the direction of upward. 3. At the early stage, the distance from the distal end of the mandibular first permanent molar to the anterior portion of the ascending ramus was 0.9~1.0 times larger than the mesio-distal diameter of the mandibular second molar, but at the later stage it was increased 1.4 times larger than the mesio-distal diameter of the mandibular second permanent molar.

• 대한치과의사협회지
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• 제52권5호
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• pp.281-290
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• 2014

Tooth eruption disturbance is seen commonly in mixed dentition or early permanent dentition. During this period of time, children experience the growth and development of craniofacial skeleton and dentition, so the impaction and eruption disturbance of permanent teeth make many problems in oral and maxillofacial areas. Eruption guidance of impacted tooth is not simple because many factors related to impaction are considered. Several factors such as etiology, tooth development stage, location of impacted teeth or eruption pathway, patient cooperation, etc. need to be taken into consideration in deciding the management of the impacted tooth. In the present study, it was assessed the etiology and impaction status of impacted tooth through various cases, and try to explain the treatment method to guide eruption by surgical exposure.

• 대한장애인치과학회지
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• 제13권1호
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• pp.6-13
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• 2017

Premolars show the greatest variation in development and eruption. The present case report identified characteristics of eruption of maxillary premolars with delayed development. Multiple maxillary premolars with delayed development were found to have a palatal ectopic eruption pattern, which was self-corrected through eruption guidance by extraction of preceding primary teeth at the stage of root development when eruption force was maximal. In addition, delayed eruption due to delayed development was substantially improved by eruption guidance. Early erupted premolars with less than 1/3 of root development were induced to have normal root development using stabilizing appliance. The maxillary premolars with delayed development reported in the present study showed no complications such as impaction, space loss by delayed eruption, or insufficient root development.

• 대한소아치과학회지
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• 제21권2호
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• pp.491-495
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• 1994

The ectopic eruption is defined rise to be abnormal eruption, which gives to displacement of the teeth and abnormal root resorption of adjacent teeth. The ectopic eruption of first permanent molar is approximately 2-4% of the population, most of them are in the maxilla, rarely in the mandible. In the case of the second permanent molars, most of them are found in the mandible for the reason of the arch length discrepancies and large size of the teeth. The ectopic erupted molars should be treated early in order to coordinate normal growth pattern and to obtain good occlusal support. So, this should be early diagnosed and treated. But, ectopically erupting molars are often self-corrected, hence periodic follow-up is required. The methods of the treatment are largely classified into surgical, surgical-orthodontic, and orthodontic method. Especially in orthodontic method, they are divided as follows; appliances that is positioned at the contact point for unlocking and the distal movement, fixed and removable appliance that is connected to more than one tooth, and occlusion guiding method after disking or extraction of the second deciduous molar. The report presents the good results in treating patients, whose chief complaint was ectopic eruption of mandibular permanent molars.

• 대한소아치과학회지
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• 제38권1호
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• pp.62-67
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• 2011

치아의 맹출은 일반적으로 치근의 1/2~2/3이 완성(Nolla stage 7)되었을 때 임상적으로 출은(emergence)하여 치근 형성이 완성되기 전에 교합평면에 도달한다. 조기 맹출이란 맹출이 가속화되어 정상 맹출 시기 보다 이른 시기에 맹출하는 것으로, 일반적으로 정상 범주를 벗어나는 영구치의 조기 맹출은 매우 드물며 유치의 만성 치근단 주위염 등의 국소적 원인으로 인한 계승 영구치의 상방 치조골이 광범위하게 파괴되었을 때 치아의 치관이나 치근의 형성이 거의 이루어지지 않은 채 계승 영구치가 조기 맹출하는 것을 관찰할 수 있다. 또한 영구치의 조기 맹출에 영향을 미칠 수 있는 여러 전신 질환이 있는 경우에도 영구치의 조기 맹출이 가능하다. 조기맹출 치아의 임상 소견으로는 심한 동요도와 저작 시 동통, 법랑질의 저석회화, 치아의 편향과 변위, 회전 등이 있으며, 방사선학적 소견으로는 미발육된 치근과 골지지의 부족 등이 있다. 조기 맹출 영구치의 발생 가능한 합병증으로는 만성적인 외상과 동통 및 부종이 있을 수 있고, 맹출 순서의 변경과 인접치의 이동으로 인한 소구치 매복율의 증가, 치아의 변위와 회전이 야기될 수 있으며, 영구치의 탈락도 있을 수 있다. 따라서 증상이 있는 조기 맹출 영구치의 경우 공간 유지 및 영구치 고정과 주위 조직의 회복, 치근 발육의 유도를 위해 적절한 처치가 필요하다. 전신 질환이 없는 만7세 여환이 상악 양쪽 제 1소구치의 심한 동요도와 동통을 주소로 치과 의원에서 의뢰되었다. 임상 및 방사선 검사상 치근 형성이 거의 없이 양측 상악 제 1소구치들이 조기 맹출되어 심한 동요도와 부종 및 저작 시동통을 나타내어 상악 제 2유구치에 교정용 band와 spur를 이용한 구내 고정식 장치를 제작하여 14개월 간 장착하여 조기 맹출한 치아들을 안정화시키고 성공적으로 치근 형성을 도모하였기에 이를 보고하는 바이다.

• 대한소아치과학회지
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• 제3권1호
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• pp.19-31
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• 1976

To study the eruption pattern of the mandibular first permanent molar, the author took 263 cases of Oblique Cephalogram from age 3 to 6 years old children and observed the vertical and mesiodistal directional change and tooth axis change. The following results were obtained.; 1. The eruption pattern of the mandibular first permanenl molar was changed at about 60~66 months or calcification stage IX. 2. At the early stage, the path of eruption of the mandibular first permanent molar directed upward and forward and after calcification stage IX it changed to the direction of upward. 3. The height of the alveolar bone of the upper part of the mandibular first permanent molar was almost equal to that of the interseptal bone of the first and second deciduous molar, but the height showed gradual descent afterwards. 4. At the early stage, the distance from the distal end of the mandibular second deciduous molar to the anterior portion of the ascending ramus was 1.2~1.4 times larger than the mesio-distal diameter of the mandibular first permanent molar, but at the later stage it was enlarged 1.7~1.9 times larger than the mesiodistal diameter of the mandibular first permanent molar.