• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제46권6호
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• pp.422-427
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• 2020

Management of maxillofacial trauma includes primary care, in which diagnosis and management of dentoalveolar injury play a vital role. Due to the impact sustained during a maxillofacial injury (whether direct or indirect), dentoalveolar injuries can occur, leading to fracture and displacement of teeth and associated alveolar bone into the surrounding soft tissues and associated structures, such as the maxillary sinus, nasal cavity, upper respiratory tract, tracheobronchial tree, or gastrointestinal tract. Undiagnosed displaced teeth may cause complications such as airway obstruction. This paper reports a case of displaced teeth in the nasal cavity and gastrointestinal tract and highlights the management protocol for displaced teeth secondary to maxillofacial trauma.

• 대한소아치과학회지
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• 제35권4호
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• pp.642-651
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• 2008

본 연구는 2003년 1월부터 2007년 7월까지 전남대학교 병원 소아치과와 응급실에 치아 외상을 주소로 내원한 환자 570명(치아수: 1394개)을 대상으로 연령, 성별분포, 발생원인 및 장소, 손상 받은 치아의 위치 및 유형, 초진시 처치 등에 대한 조사를 통해 외상에 대한 적절한 진단과 치료에 도움이 되고자 시행하였다. 1. 성별에 따른 발생빈도는 1.9:1로 남자의 비율이 높았고, 나이에 따른 발생 빈도는 1세, $6{\sim}8$세, $17{\sim}18$세 때 높았다. 2. 외상의 원인은 유치열과 혼합치열에는 넘어진 경우가 가장 많았으며 영구치열에서는 교통사고와 싸움으로 인한 손상 빈도가 높았다. 외상을 입은 장소는 유치열은 집에서, 혼합치열, 영구치열에는 길에서 비율이 높았다. 3. 외상시 손상 받은 치아의 위치는 유치와 영구치 모두 상악 중절치의 비율이 높았다. 손상의 유형은 유치와 영구치 모두 치주조직의 손상이 많았는데, 유치는 아탈구, 진탕, 함입 순이었으며, 영구치는 아탈구, 진탕, 완전탈구 순이었다. 4. 초진시의 처치는 특별한 처치 없이 경과를 관찰하는 경우가 대부분이었으며, 유치는 33.1%, 영구치에서는 44.5%의 재 내원률을 보였다. 치주조직 손상 후 유치는 20.3%, 영구치는 26.6%의 치수 괴사율을 보였다.

• 대한소아치과학회지
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• 제44권2호
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• pp.188-193
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• 2017

선천치와 신생치는 출생시 맹출했거나 조기에 맹출하는 치아로 다양한 합병증을 가지고 있으나, 많은 부모들이 이에 대한 정보부족으로 적절한 치료 없이 불편을 겪고 있다. 본 연구는 2006 - 2015년에 경희대학교 치과병원 소아치과를 내원한 환아에게서 발견되는 선천치와 신생치의 특성을 평가하고자 한다. 환아들의 성별, 부모의 주소, 임상적인 특징과 합병증 및 치료법을 조사하여 후향적 연구를 진행하였다. 환아들 가운데 69%는 선천치를, 31%는 신생치를 가졌으며 모두 하악 절치였다. 여환이 남환보다 많았고 내원 주소로는 부모의 걱정이 가장 많았으며 병원 의뢰와 리가 페데병(Riga-Fede disease) 그리고 수유시 통증이 그 뒤를 이었다. 치료방법으로는 발치가 가장 많았으며 치아 유지와 치아 다듬기도 행해졌다. 선천치와 신생치는 다양한 특성과 합병증을 가지고 있으므로 치과의사는 아이의 전반적인 건강을 위해 이러한 치아의 병리에 대해 정확히 이해하는 것이 중요하다.

• 대한소아치과학회지
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• 제43권3호
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• pp.254-263
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• 2016

지금까지 완전탈구된 치아의 예후에 대해 많은 연구가 발표되었으나, 국내의 소아와 청소년을 대상으로 한 추적 조사 연구는 거의 없다. 이에 본 연구에서는 6-14세 환자 142명의 재식치 184개를 대상으로 전자의무기록지와 치근단 방사선 사진을 평가함으로써 재식된 영구 절치의 치유와 예후에 영향을 미치는 인자에 대해 분석하였다. 재식치의 치근 발육 단계가 낮을수록 치수의 재혈관화 가능성이 높았다. 구외 시간이 60분 이상인 경우 염증성 치근 흡수의 발생률은 미성숙 치아에서 높게 나타났으며, 대치성 치근 흡수의 발생률은 성숙 치아에서 높게 나타났다. 20일 이상 경과하여 발수한 경우 염증성 치근 흡수의 발생률이 증가하였으며, 대치성 치근 흡수에 비해 염증성 치근 흡수가 생존 기간의 감소에 더 큰 영향을 미치는 것으로 나타났다. 치근의 발육 단계와 재식치의 생존 기간 간에 상관관계는 없었으나, 대치성 치근 흡수가 발생한 경우 미성숙 치아의 생존 기간은 성숙 치아에 비해 짧았다. 본 연구는 장기간의 추적 조사를 통해 수행한 연구로서, 완전탈구된 치아의 치료 지침과 예후 평가에 대한 기초 자료로 활용될 수 있으리라 생각된다.

• 수산해양기술연구
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• 제35권4호
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• pp.366-376
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• 1999

In order to examine the catching selectivity of the ark shell(Scapharca broughtonii) dredge, the various factors affecting the selective action of the dredge are analyzed, and the probabilities of the ark shell not shifting through the gaps between the teeth, and the mesh of the netting bag, are calculated for the various shell lengths, using the relation between the posture and the length when the shell passes through these parts.Considering that the probability of making catch is the product of the both probabilities described above, and that this probability is proportional to the relative catching efficiency, the selectivity curves for the ark shell dredge were estimated for various gaps between the teeth and for the various mesh sizes of the netting bag. The obtained results are summarized as follows :1. The ratios of the shell length of ark shell to the distance between teeth indicating the relative catching efficiency of 0%, 50, 100% respectively were 1.0, 1.26~1.28, 1.47~1.44, and that the selection ranges of selective shell length by the distance between teeth were 0.47~0.44, where the distances between teeth were 3.2cm, 3.6cm, 4.0cm, 4.4cm and 4.8cm. 2. The ratios of the shell length of ark shell to the mesh size indicating the relative catching efficiency of 0%, 50%, 100% respectively were 0.67, 0.84, 0.97 and that the selection range of shell length for catching, that in the range of selective shell length by the mesh size was 0.31, where the distance of 4.0cm between teeth, mesh size of 6.0 cm and the smaller mesh angle of $60^{\circ}$3. Where the distance between teeth is 4.0 cm and the smaller mesh angle is $60^{\circ}$, the selection range of shell length for catching of the ark shell dredge is decreased according to the mesh size, and it is minimized by 0.20 in the mesh size of 9.0~10.0 cm, but increased in the mesh size of over 11.0 cm. 4. Where the distance between teeth is 4.0 cm, the selective action by the mesh size of netting bag is begun with the mesh size of over 10.0 cm.

• 한국학교ㆍ지역보건교육학회지
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• 제15권2호
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• pp.103-113
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• 2014

Objectives: The purpose of this study was to clarify the relationship between perceived oral health and oral health status, oral health symptoms in elementary school students. Methods: Oral examination and oral hygiene survey were performed on 446 students in 5th grade from 4 elementary schools in Wonju, Gangwon province. Oral examination assessed decayed teeth, filled teeth, missing teeth from decay. Then, oral hygiene status was evaluated by O'Leary index and self-reported questionnaires were surveyed. We analysed the collected data using SPSS program ver. 20.0, significant difference level was p<0.05. Results: 38.4% of the subjects rated their oral health as poor, 61.6% as good, female students was worried about their appearances than male students. Their decayed teeth was 1.01, missed teeth was 0.01, filled teeth was 1.75, O'Leary index was 64.49, oral hygiene status of them was poor. Perceived oral health was associated to decayed teeth, DMFT, oral health symptoms except tooth fracture and pain of mucosa (p<0.05). However, there is no correlation between perceived oral health and oral hygiene status (p>0.05) Conclusion: Self-rated oral health status of the elementary school students was related to decayed teeth and oral health symptoms, but it was not related to oral hygiene status. Therefore it was needed to improve the oral hygiene status in elementary students by devise effective way to motivate them.

• 대한소아치과학회지
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• 제25권4호
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• pp.749-760
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• 1998

The main purpose of this study was to evaluate the effect of dentin with various pretreatment application time on the dentin surface structure and the bond strength of glass ionomer restorative matrials between primary and permanent tooth. There are difference of composition, structure and pretreated effect of dentin conditioning between the primary and permanent teeth. Inspite of thease fact, we used the same application time of permanent tooth. This study intends to determine the most effective application time using SEM analysis of the surface change by dentin conditioning. Forty five intact primary and permanent teeth were splited mesiodistally with seperating diamond disk. Each eight specimens were prepared for shear bond strength test. (randomely devided eight group as follows:) group I conditioning for five seconds group II conditioning for ten seconds group III conditioning for fifteen seconds group IV conditioning for twenty seconds Additional specimens were prepared to SEM analysis. The result are as follows: 1. Primary teeth are higher shear bond strength in group I and group II. 2. There was no statistically significant difference between primary and permanent teeth in group III and group IV. 3. In SEM analysis, smear layer removal by dentin pretreatment of primary teeth was faster than permanent teeth. Primary teeth may require shorter pretreatment time of dentin for G-I restoration than that of permanent teeth.

• 대한소아치과학회지
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• 제28권1호
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• pp.67-71
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• 2001

어린이에서 낭종이 발생하는 경우. 종종 계승 영구치의 정상적인 맹출을 방해할 수 있다. 그러나, 이러한 치아들은 일반적으로 맹출 할 수 있는 잠재력을 가지고 있다. 따라서 치아의 맹출을 방해하는 장애물을 제거해 주는 경우, 치아는 저절로 정상적인 위치에 맹출될 수 있다. 이러한 경우 일반적으로 낭종의 처치와 함께 변위된 치아의 맹출 유도과정이 요구된다. 낭종의 제거를 위해 많은 외과적 방법이 제시되어 왔다. 그러나, 낭종이 크거나 영구치를 변위시킨 경우에서는 적출술에 비하여 조대술이 추천된다. 조대술을 시행함에 있어서 그 개구부를 적절하게 유지하는 경우, 낭종의 처치와 함께 변위된 치아를 정상적으로 맹출 유도하는 것이 가능하다. 본 증례는 낭종에 의해 계승 영구치가 변위된 경우로서, acrylic obturator를 이용한 조대술을 시행하여 변위된 치아의 정상적인 맹출이 이루어짐과 동시에 남종의 치유가 적절히 이루어 졌기에 문헌고찰과 함께 보고하는 바이다.

• 대한치과교정학회지
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• 제20권2호
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• pp.267-280
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• 1990

The purpose of this study was to investigate the force mechanism of Multiloop Edgewise Arch Wire and the intensity and distribution of stresses with vertical and intermaxillary elastics. The obtained results were as follows. 1. When plain wires were inserted and vertical and intermaxillary elastics were used in the upper and lower arch, the stresses of the anterior and posterior ends of wires were observed greatly but the stresses of the premolar were very small. 2. When MEAW were inserted in upper and lower arch, the upper 1st and 2nd premolar and the lower 1st premolar were extruded greatly. 3. In the area of the upper 1st molar and the lower 2nd premolar and the lower 1st molar, any stresses were not observed. 4. The vertical elastic counteracted the intrusion force of the MEAW in the anterior teeth but could not affect on posterior teeth. Using with the Class II elastics, the distal tipping force and extrusion force were exerted in the upper anterior teeth and the intrusion forces of the lower anterior teeth were relieved. Using with the Class III elastics, the extrusion force were exerted in the upper and lower anterior teeth, the distal tipping force were increased in the lower posterior teeth. 5. The Class II elastic counteracted the anterior intrusion force of the MEAW and extruded and tipped mesially the lower 2nd molar. The intrusion force of the MEAW also could not overcome the extrusion force of the class II elastics. 6. When the Class III elastics were engaged, the upper 2nd molar was extruded in spite of the intrusion forces of the MEAW and the extrusion forces of the lower anterior teeth and distal tipping forces in the posterior teeth were observed.

• 대한치과교정학회지
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• 제45권5호
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• pp.261-267
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• 2015

Objective: To measure aspartate aminotransferase (AST) activity in the pulp of teeth treated with fixed appliances for 6 months, and compare it with AST activity measured in untreated teeth. Methods: The study sample consisted of 16 healthy subjects (mean age $25.7{\pm}4.3$ years) who required the extraction of maxillary premolars for orthodontic reasons. Of these, 6 individuals had a total of 11 sound teeth extracted without any orthodontic treatment (the control group), and 10 individuals had a total of 20 sound teeth extracted after 6 months of orthodontic alignment (the experimental group). Dental pulp samples were extracted from all control and experimental teeth, and the AST activity exhibited by these samples was determined spectrophotometrically at $20^{\circ}C$. Results: Mean AST values were $25.29{\times}10^{-5}U/mg$ (standard deviation [SD] 9.95) in the control group and $27.54{\times}10^{-5}U/mg$ (SD 31.81) in the experimental group. The difference between these means was not statistically significantly (p = 0.778), and the distribution of the AST values was also similar in both groups. Conclusions: No statistically significant increase in AST activity in the pulp of mechanically loaded teeth was detected after 6 months of orthodontic alignment, as compared to that of teeth extracted from individuals who had not undergone orthodontic treatment. This suggests that time-related regenerative processes occur in the dental pulp.