• 대한소아치과학회지
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• 제44권3호
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• pp.317-326
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• 2017

이 연구의 목적은 인위적으로 형성된 수여부에 자가이식한 상악 견치의 생존율과 성공률에 대해 알아보고 성공적인 이식에 영향을 주는 요인에 대해 분석하는 것이다. 28명 남녀 어린이의 37개의 자가이식한 상악 견치에 대해 후향적으로 조사하였으며 평균 관찰 기간은 25.1개월이었다. 임상 및 방사선적 평가를 통해 동요도, 병적인 치근 흡수, 수직적 치조골소실 그리고 유착에 대해 조사하였다. 관찰 기간 동안 100%의 생존을 보였으나 13개의 치아가 실패로 분류되어 64.9%의 성공률을 보였다. Cox 비례위험모형에서 성공률에 영향을 주는 요인은 공여치아의 치낭의 비후로 나타났다. 이 연구는 임상가들에게 자가치아이식 시 인위적으로 치조와를 형성할 경우 예후를 판단하는 지침이 될 수 있다고 생각된다.

• 대한소아치과학회지
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• 제39권1호
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• pp.73-78
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• 2012

복잡 치아종은 치아와 해부학적인 유사성이 없는 법랑질, 상아질, 백악질의 덩어리로 구성되어 있다. 이 병소의 대부분은 증상이 없어 일상적인 방사선 검사나 치아의 맹출 실패의 원인을 감별하기 위한 검사를 통해 발견된다. 복합 치아종은 골 팽창을 보이는 경우가 드물지만, 복잡 치아종은 경미하거나 뚜렷한 골 팽창을 보인다. 복잡 치아종은 거의 영구치와 연관되어 있고 유치와 연관된 경우는 매우 드물다. 이는 보통 하악의 유구치 부위에 발생한다. 본 증례는 상악 유견치의 매복과 연관된 복잡 치아종을 외과적 방법으로 제거하고 자가맹출을 용이하게 하기 위해 치은 하방에 재위치 시켰다. 수술 6개월 후에 상악 유견치가 자가 맹출되었으므로 이를 보고한다.

• 대한소아치과학회지
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• 제38권4호
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• pp.407-412
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• 2011

선양 치성 종양(adenomatoid odontogenic tumor)은 악골에 드물게 발생하는 치성 기원의 종양이다. 이전에는 법랑모세포종(ameloblastoma)의 한 종류로 여겨졌으나 양성이며 재발되는 경우는 극히 드물다. 상악 견치에 호발하며 대개는 무증상이지만 크기가 천천히 커져 무통성 종창을 일으킬 수 있다. 방사선학적으로 함치성 낭종(dentigerous cyst) 및 단방성 법랑모세포종(unicystic ameloblastoma)과 매우 유사하다. 일반적으로 보존적인 소파술(curettage) 및 적출술(enucleation)을 통해 치료한다. 본 증례는 하악 우측 측절치 미맹출을 주소로 내원한 10세 여자 환아에서 방사선 사진 검사를 통해 치아의 매복 및 병소를 확인하고 적출술을 시행하였다. 치아에는 브라켓을 부착하여 교정적 정출을 유도하였다. 조직학적 검사를 통해 선양 치성 종양으로 확진되었으며 양호한 치료 결과를 보였기에 보고하는 바이다.

• 대한치과의사협회지
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• 제56권1호
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• pp.42-48
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• 2018

INTRODUCTION The most commonly impacted tooth is the third molar. An impacted third molar can ultimately cause acute pain, infection, tumors, cysts, caries, periodontal disease, and loss of adjacent teeth. Local anesthesia is employed for removing the third molar. This study aimed to evaluate the efficacy and safety of 2% lidocaine with 1:80,000 or 1:200,000 epinephrine for surgical extraction of bilateral impacted mandibular third molars. METHODS Sixty-five healthy participants underwent surgical extraction of bilateral impacted mandibular third molars in two separate visits while under local anesthesia with 2% lidocaine with different epinephrine concentration (1:80,000 or 1:200,000) in a double-blind, randomized, crossover trial. Visual analogue scale pain scores obtained immediately after surgical extraction were primarily evaluated for the two groups receiving different epinephrine concentrations. Visual analogue scale pain scores obtained 2, 4, and 6 h after administering an anesthetic, onset and duration of analgesia, onset of pain, intraoperative bleeding, operator's and participant's overall satisfaction, drug dosage, and hemodynamic parameters were evaluated for the two groups. RESULTS There were no statistically significant differences between the two groups in any measurements except hemodynamic factors (P > .05). Changes in systolic blood pressure and heart rate following anesthetic administration were significantly greater in the group receiving 1:80,000 epinephrine than in that receiving 1:200,000 epinephrine ($P{\leq}01$). CONCLUSION The difference in epinephrine concentration between 1:80,000 and 1:200,000 in 2% lidocaine liquid does not affect the medical efficacy of the anesthetic. Furthermore, 2% lidocaine with 1:200,000 epinephrine has better safety with regard to hemodynamic parameters than 2% lidocaine with 1:80,000 epinephrine. Therefore, we suggest using 2% lidocaine with 1:200,000 epinephrine rather than 2% lidocaine with 1:80,000 epinephrine for surgical extraction of impacted mandibular third molars in hemodynamically unstable patients.

• Imaging Science in Dentistry
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• 제46권4호
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• pp.251-258
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• 2016

Purpose: The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. Materials and Methods: The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Results: Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Conclusion: Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape.

• 대한소아치과학회지
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• 제37권2호
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• pp.202-206
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• 2010

치아 맹출 속도는 여러가지 국소적 및 전신적 요소에 의해 영향을 받는다. 그 중 갑상선 호르몬은 치아 맹출 속도와 비례적인 관계를 갖는 것으로 알려져 있다. 갑상선 호르몬은 기초 대사율을 조절하는데 있어서 중요한 역할을 하며, 치과 영역과 관련하여 치아 맹출 속도에 영향을 줄 수 있다. 본 증례에서 만 11세 여아의 매복된 상악 견치의 교정적 견인 시 특정 시점에서 교정적 치아 이동이 빠르게 진행되었고, 이는 갑상선 기능 항진증이 나타난 시기와 일치하였다. 이는 혈청 갑상선 호르몬 수치와 교정적 치아 이동 속도 사이의 연관성을 시사한다.

• 대한치과교정학회지
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• 제18권1호
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• pp.79-88
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• 1988

The purpose of this study was to investigate the factors which might be related to mandibular third molar eruption and to predict the possibility of whether or not it will be erupted. The material of this study was lateral cephalometric radiograms, pantomograms and dental casts obtained from 70 patients (19 males, 51 females) ranging in age from 18.0 to 32.1 years. They were devided into erupted group and impacted group of mandibular third molars. For the comparison of each group, a total of 20 measurement items were employed and the data were analyzed by means of computer statistical method. As a result of this study, the following conclusion can be made; 1. The longer mandibular body length and narrower mandibular ramus width, the higher eruption tendency of the lower third molar, but the degree of genial angle was not related to mandibular third molar eruption. 2. The lower percentage of posterior mandibular body height to anterior mandibular body height, the higher eruption tendency of the lower third molar. 3. The total tooth size, including the lower second molar, appeared to be larger in the impacted group than in the erupted group of the lower third molar. 4. The arch length discrepancy of the impacted group was more severe in contrast with the erupted group of the lower third molar.

• 대한소아치과학회지
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• 제24권4호
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• pp.758-762
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• 1997

There are various types of localized tooth malpositions in the mixed dentition, such as abnormal tooth axis, anterior crossbite of some incisors, impaction, midline diastema, ectopic eruption, and so forth. We, Pediatric Dentists, have usually used removable appliances for these instances. But, removable orthodontic appliances, as is known, have marked limitations in some situations, for example, severe rotation, intrusion and extrusion, root torque, closure of large diastema, traction of impacted tooth, etc. In such cases, Whip spring, combined with fixed or removable appliance, can increase utilities of removable orthodontic appliances. The authors have applied whip springs to some cases showing localized positional and arrangement problems, and have witnessed the results as follows; 1. The refined and elaborate control of direction and magnitude of force by the operator, and accurate compliance of the patients were requisite for the treatment with it. 2. It showed special effectiveness for de rotation of incisors. Although it yields some benefit for root movement, the special consideration for incomplete roots in this age bracket was required. 3. In the localized malalignment cases in mixed dentition, uncurable with traditional removable appliances but practically unrealistic with fixed appliance therapy, the whip spring was thought to be a good alternative.

• Imaging Science in Dentistry
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• 제51권4호
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• pp.373-382
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• 2021

Purpose: Cone-beam computed tomography (CBCT) reconstructions were analysed to elucidate factors affecting the anatomical relationship between tooth roots and the mandibular canal(MC). Materials and Methods: Images of 300 volumetric tomography scans of patients aged between 20 and 79 years old (167 women and 133 men) were analysed. The mean distances between 2,053 dental root apices and the internal border of the MC were obtained by measuring the horizontal and vertical distances on coronal CBCT images. The actual distance was then calculated mathematically with the Pythagorean formula. The statistical significance of differences between men and women was assessed using the Mann-Whitney test. Correlations with patient age were evaluated with the Spearman rank correlation coefficient. Results: The mean distances ranged from 2.17 mm, for single right third molar roots in women, to 8.02 mm for single left third molar mesiolingual roots in men. The mean distances measured for the mandibular right second molar mesial roots and the right second premolar roots were larger in men than in women. Age showed a significant positive correlation with the measured distances for mesial and distal roots of the first and second molar on both sides and the right third molar, mesiolingual roots of the left third molar, and single roots of the right third molar. Conclusion: The root-to-mandibular canal distance depended on age and the type of tooth. In 2 root types, this distance was impacted by sex.

• 대한치과교정학회지
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• 제23권1호
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• pp.137-145
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• 1993

Inverted maxillary incisor is that maxillary incisor rotates to the counterclockwise direction. The incisal margin and root apex of the impacted incisor is palpated at the mucobuccal fold near the labial frenum and on the palate among the rugae, respectively. Orthodontists confront ectopically erupting teeth in various locations. In the past, extraction of impacted teeth that deviated from their normal course of eruption had been performed indiscriminately. But, if it has not any clearcut contraindications, effeort should be made to achieve optimal esthetic results by conservative means, combining the skills of oral surgeon and orthodontist. The present report provides an illustration of satisfactory correction of a inverted maxillary incisor with surgical intervention and many springs that correct the tooth axis. This technique provides the clinician with an additional means to avoid unnecessary extraction of inverted teeth in certain cases.