• 대한치과교정학회지
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• 제35권3호
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• pp.182-195
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• 2005

본 연구의 목적은 성장기 el급 부정교합 환자에서 상악 제2대구치를 발거하고 치료한 증례와 비발거로 치료한 증례 중 비교적 양호한 결과를 얻은 증례들을 후향적으로 관찰하여 두 군간의 치료 전 측모 두부방사선 사진 상에서 골격성 치성, 연조직 특성을 비교하고자 하였다. II급 구치 및 견치관계를 보이고 7mm 이하의 수평피개. 중등도 이하의 총생을 갖는 51명의 환자를 18명의 상악 제2대구치 발거 치료군과 33명의 비발거 치료군으로 분류하여 비교하였다. 두 군간의 비교는 t-검정법으로 시행하였고 판별분석을 통해 두 군을 판별해 주는 주요 항목들을 알아보았으며 다음과 같은 결론을 얻었다. 골격성 특성 중, 전후방적인 계측 항목에서는 유의성 있는 차이를 보이는 항목은 없었으며 $AB-MP(^{\circ)$ $Na-Me(^{\circ})$, AVD (anterior vertical dimension, mm) 와 같은 수직적 계측 항목에서만 유의성 있는 차이를 보였다 (p<0.05). 치성 특성 중에서는 상하악 제1대구치의 위치 및 경사도와 관련된 항목 및 상악 제3대구치의 경사도에서 유의성 있는 차이를 보였으며 특히 발거군에서 상악 제1대구치의 교합평면 및 FH 평면에 대한 근심경사도가 더 컸다. 두 군 간에 유의성 있는 차이를 보이는 계측 항목들(U8-FH$(^{\circ})$는 제외)을 이용하여 발거군과 상악 제3대구치가 양호했던 비발거 증례군에 대해 증감 판별분석을 시행하였으며 그 결과 양 군을 판별하는데 기여도가 높은 항목은 U6-VRL(mm), $AB-MP(^{\circ)$으로 나타났다. 이 두 항목으로 이루어진 판별식을 도출한 바 본 연구에 이용된 발거군과 비발거군 증례들의 $78.4\%$를 정확히 분류해 낼 수 있었다. 또한 본 연구에 사용된 모든 계측 항목들(U8-FH$(^{\circ})$는 제외)을 이용하여 발거군과 비발거군에 대해 증감 판별 분석을 시행한 결과 U8-VRL(mm). $AB-MP(^{\circ)$, 그리고 $U7-FH (^{\circ})$가 양 군을 분별하는데 유의성이 있었고 이 세 항목들을 이용한 판별식을 통해서 $89.2\%$를 정확히 분류해 낼 수 있었다.

• 대한소아치과학회지
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• 제50권4호
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• pp.373-384
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• 2023

이 연구의 목적은 소아 청소년의 하악 견치, 제1, 2소구치, 제2, 3대구치의 발육 단계별 평균 연령을 확인하고, 이를 토대로 하악 제3대구치의 발생 유무를 추정할 수 있는 하악 견치, 제1, 2소구치, 제2대구치의 발육 단계를 확인하는 것이다. 2019년 1월부터 2020년 12월까지 서울대학교치과병원에 내원한 만 6 - 15세 사이의 건강한 환자의 1,956개의 파노라마 방사선 사진을 이용하여, Demirjian과 Goldstein의 방법으로 양측 하악 견치, 제1, 2소구치, 제2, 3대구치의 치아 발육 단계를 평가하였다. 제3대구치의 치배가 처음 관찰되는 연령은 평균 9.34 ± 1.35세였고, 6세부터 12세에 걸쳐 다양하게 나타났다. 하악 견치, 제1, 2소구치가 F단계, 제2대구치가 E단계 이후에도, 제3대구치가 관찰되지 않으면 제3대구치의 결손 가능성이 높은 것으로 나타났으며 그 연령은 평균 10세였다. 제3대구치의 발육 여부를 추정할 때 치아 하나만을 고려한다면 제2소구치와의 추정 부합도가 가장 높았으며 4개 치아 전부를 포함했을 때와 큰 차이가 없었다.이번 연구를 통해 만 6세에서 15세 사이의 소아 청소년에서 하악 견치, 제1, 2소구치, 제2대구치의 발육 단계별 연령 분포를 확인할 수 있었으며, 이를 근거로 하악 제3대구치의 발육 여부를 평가할 수 있는 하악 견치, 제1, 2소구치, 제2대구치의 발육 단계를 확인할 수 있었다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제33권5호
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• pp.385-391
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• 2011

Purpose: The periosteum is a well-known source of osteogenic precursor cells for tissue-engineered bone formation. However, cultured endothelial or endothelial-like cells derived from periosteum have not yet been investigated. This study focused on endothelial-like cell culture from the periosteum. Methods: Periosteal tissues were harvested from the mandible during surgical extraction of lower impacted third molars. The tissues were treated with 0.075% type I collagenase in phosphate-buffered saline (PBS) for 1 hr at $37^{\circ}C$ to release cellular fractions. The collagenase was inactivated with an equal volume of DMEM/10% fetal bovine serum (FBS) and the infranatant was centrifuged for 10 min at 2,400 rpm. The cellular pellet was filtered through a $100{\mu}m$ nylon cell strainer, and the filtered cells were centrifuged for 10 min at 2,400 rpm. The resuspended cells were plated into T25 flasks and cultured in endothelial cell basal medium (EBM)-2. Results: Among the hematopoietic markers, CD146 was more highly expressed than CD31 and CD34. The periosteal-derived cells also expressed CD90 and CD166, mesenchymal stem cell markers. Considering that the expression of CD146 was constant and that the expression of CD90 was lower at passage 5, respectively, the CD146 positive cells in passage 5 were isolated using the magnetic cell sorting (MACS) system. These CD146 sorted, periosteal-derived cells formed tube-like structures on Matrigel. The uptake of acetylated, low-density lipoprotein, labeled with 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI-Ac-LDL) was also examined in these cells. Conclusion: These results suggest that the CD146-sorted positive cells can be referred to as periosteal-derived CD146 positive endothelial-like cells. In particular, when a co-culture system with endothelial and osteoblastic cells in a three-dimensional scaffold is used, the use of periosteum as a single cell source would be strongly beneficial for bone tissue engineering.

• 대한소아치과학회지
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• 제30권3호
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• pp.495-501
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• 2003

매복은 임상적 또는 방사선학적으로 인식할 만한 맹출로의 장애물이나 잘못된 치배의 위치로 인하여 치아의 맹출에 진전이 없는 것을 말한다. 제 3 대구치와 상악 견치를 제외하고 제 2 소구치에서 가장 흔히 매복이 발생하며, 소구치의 매복은 전체 매복의 0.5%를 차지한다. 소구치 매복의 치료에는 교정적 견인과 외과적 재위치가 필요할 수도 있지만, 만기 잔존된 유구치에 의해 발생한 소구치 매복은 유구치의 발거 및 공간 유지로서 소구치의 맹출을 유도할 수 있다. 본 증례는 제 2 소구치의 미맹출을 주소로 경북대학교병원 소아치과에 내원한 환아에서 만기 잔존된 제 2 유구치를 발거하고 공간 유지를 하여 제 2 소구치의 자발적 맹출을 시도하였는 바 다음과 같은 결과를 얻을 수 있었다. 1. 만기 잔존된 제 2 유구치와 연관된 매복된 제 2 소구치는 유치 발거를 통한 최소한의 치료로 양호한 결과를 얻을 수 있다. 2. 제 2 소구치가 맹출할 때까지 적절한 공간 유지와 정기적인 방사선 검사가 필요하다. 3. 교정적 견인 또는 외과적 재위치를 시도하기 전 치아의 이동을 확인하기 위한 충분한 시간이 허용되어야 한다. 4. 치근이 미완성된 치아에서 좀 더 성공적인 결과를 얻을 수 있다.

• 대한치과보철학회지
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• 제40권5호
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• pp.451-469
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• 2002

The purpose of this study was to estimate the effect of a bleaching agent on tooth surfaces and to evaluate the resin bond strength according to different surface treatments on bleached teeth. To prepare for the experimental samples, first, extracted human third molars were used and the body portions of the crowns were cut into four equal-sized specimens. Next, each specimen was mounted in an plastic bottle with self-cured resin and highly polished to have them reveal the enamel or dentin surfaces. Then, the enamel(E) and dentin(D) specimens were divided into four ; 1) non-bleached, laser-treated(NBLA) group 2) bleached, laser-treated(BLLA) group 3) non-bleached, acid-treated(NBAC) group and 4) bleached, acid-treated(BLAC) group. Here, $opalescence^{(R)}$ (10% carbamide peroxide) was used for bleaching agent. The treated specimens were observed by confocal laser scanning microscopy and bonded with composite resin for shear bond test. The following results were obtained from this experiment : 1. Compared with the ENB group, the EBL group was shown be dyed about $20{\mu}m$ deeper with rhodamine B. The DBL group appeared to be caved in at the entry part of the dentinal tubules, was dyed about $20{\mu}m$ deeper and $5{\mu}m$ wider in diameter, compared with the DNB group. 2. In comparison with the EBLAC group, the ENBAC group looked evenly bonded with the resin, while the DNBAC group, compared to DBLAC group, was observed to have its resin tags penetrated about $50{\mu}m$ deeper. Other than those, however, no observable differences between ENBLA and EBLLA group or between DNBLA and DBLLA group were found. 3, At the shear bond test, the ENBAC group was shown to have statistically significant higher shear bond strength than the EBLAC group(p<0.05). No statistically significant differences between the ENBLA and the EBLLA groups were observed(p>0.05). 4. At the shear bond test, the DNBAC group was shown to have statistically significant higher shear bond strength than the DBLAC group(p<0.05). No statistically significant differences between the DNBLA and the DBLLA groups were observed(p>0.05). The in vitro observations above suggest that tooth-bleaching procedure brings a certain change on enamel and dentin surfaces and it weakens the shear bond strength with composite resin when the bleached tooth was acid-treated.

• Journal of Periodontal and Implant Science
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• 제24권2호
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• pp.261-270
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• 1994

The purpose of this study was to evaluate relationship of probing attachment levels, radiographic measurements and surgical measurements according to gingival inflammatory condition. Patients with incipient to moderate periodontitis were selected. Upper and lower premolar and molar teeth excluding third molars were measured. At first visit, gingival index and bleeding on probing were taken, and subjects were grouped into 4 categories as follows : Experimental group I : gingival index 1 and no bleeding on probing. Experimental group II : gingival index 2 and no bleeding on probing absent. Experimental group III : gingival index 1 and bleeding on probing present. Experimental group IV : gingival index 2 and bleeding on probing present. Probing attachment levels were measured with manual probe on mesial and distal surfaces from cementoenamel junctions to terminal ends of probe. Radiographic measurements were made to assess bone loss by measuring the distance from cementoenamel junction to the alveolar crest. After thorough scating, a flap was raised exposing the alveolar bone and surgical measurements were made from cementoenamel junction to alveolar bone. The results were as follows: 1. Differences between probing attachment level and radiographic measurements showed $1.01{\pm}0.73mm$ for experimental group I, $0.98{\pm}0.48mm$ for experimental group II, $0.59{\pm}0.66mm$ for experimental group III, $0.98{\pm}0.38mm$ for experimental group IV and with no significant difference between groups. 2. Differences between probing attachment level and surgical measurements showed $1.36{\pm}0.80mm$ for experimental group I, $1.47{\pm}0.54mm$ for experimental group II, $1.06{\pm}0.39mm$ for experimental group III, $1.41{\pm}0.40mm$ for experimental group IV and with no significant difference between groups. 3. Differences between surgical and radiographic measurements showed $0.36{\pm}0.48mm$ for experimental group I, $0.51{\pm}0.54mm$ for experimental group II, $0.57{\pm}0.72mm$ for experimental group III, $0.41{\pm}0.49mm$ for experimental group IV and with significant difference between experimental group I and experimental group II, III, IV(P<0.05).

• 대한치과보철학회지
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• 제45권2호
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• pp.228-239
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• 2007

Statement of problem: Following tooth loss, the edentulous alveolar process of maxilla is affected by irreversible reabsorption process, with progressive sinus pneumatization leads to leaving inadquate bone height for placement of endosseous implants. Grafting the floor of maxillary sinus by sinus lifting surgery and augmentation of autologous bone or alternative bone material is a method of attaining sufficient bone height for maxillary implants placement and has proven to be a highty successful. Purpose: This study was undertaken to clarify the morphometric characteristics of inferior maxillary sinus and alveolar process for installation of implants. Material and method: Nineteen skulls (37 sinuses, 10M / 9F) obtained from the collection of the department of anatomy and cell biology of Hanyang medical school were studied. The mean age of the deceased was 69.9 years (range 44 to 88 years). The distance between alveolar border and inferior sinus margin at each tooth, the height of alveolar process and the thickness of cortical bone of the outer and inner table of alveolar process and the inferior wall of maxillary sinus were measured. Results and Conclusion: 1. The septum of inferior maxillary sinus were observe 28 sides (76.%) and located at the third molar (52.6%) and the second molar (26.3%). The deepest points of inferior border of maxillary sinus were located the first or second molar. The distance between alveolar margin and the deepest point of inferior maxillary sinus is $9.7{\pm}4.9mm$. 2. The length of the outer table of alveolar process were $4.9\sim28.2mm$ and the shortest point was between the first and the second molors. The thickness of them were $0.9\sim3.2mm$. The length of the inner table of alveolar process were $7.4\sim25.8mm$ and the shortest point was between the first and the second molars. The thickness of the were $0.9\sim4.6mm$. The results of this study are useful anatomical data for installing of maxillary implants.

• 대한소아치과학회지
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• 제36권2호
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• pp.270-274
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• 2009

함치성 낭종은 일반적으로 미맹출 치아의 치관을 포함하고 있는 형태로, 치아 법랑질과 이장 상피 사이에 액체가 축적되어 생긴 잔존 법랑 상피조직의 퇴행성 변화로 부터 생긴다. 치근단 낭 다음으로 가장 흔한 치성 낭종으로, 주로 단독으로 발생하고 하악 제 3대구치와 상악 소구치에 호발한다. 악골의 다발성 낭종은 주로 기저세포 모반 증후군과 관련된 치성 각화낭이 대부분이고, 점액다당류증 또는 쇄골두개 이형성증과도 관련이 있을 수 있다. 단발성의 함치성 낭종은 우리에게 친숙할 정도로 유병율에서 치료 및 예후까지 잘 알려져 있으나, 전신병력이 없는 다발성의 함치성 낭종은 드물며, 상악과 하악에 발생한 다발성 낭종은 특히 더 드물다. 본 증례는 편측성으로 양악에 함께 발생한 다발성의 함치성 낭종을 가진 11세 소년에 대한 치료 증례로 1년간의 관찰 후 양호할만한 결과를 얻었기에 보고하는 바이다. 1년이라는 관찰 기간이 짧기 때문에 향후 지속적인 임상적, 방사선적 관찰을 필요로 하리라 사료된다.

• Journal of Oral Medicine and Pain
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• 제15권1호
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• pp.27-35
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• 1991

In order to evaluate muscular activity patterns of masticatory muscles and asymmetry patterns of muscular activity according to the levels of occlusal force, twenty-one individuals of age ranged from 23 to 27 years were examined. They were selected according to the following criteria : 1) no symptoms of temporomandibular disorder, 2) complete dentition except third molars, 3) normal or Angle's class I molar relationship and 4) no experience of dental treatment. The electromyographic amplitudes was measured for evaluation of muscular activity and asymmetric patterns of masseter and anterior temporal muscle during unilateral clenching at the levels of 10%, 20%, 40% and 50% of the maximum occlusal force by use of electromyogram and bite force meter. The obtained results were as follows : 1. The muscle activity indices of masticatory muscles of clenching side at the clenching levels of 10%, 20% and 30% of the maximum occlusal force were -19.12, -9.87, -0.49%, so that activity of anterior temporal muscle was dominant than that of masseter muscle. At the levels of 40%, 50% of the maximum occlusal force, muscle activity indices were 4.68%, 6.70%, so that activity of masseter was dominant at all level and as the levels of occlusal force was increased, muscular activity index was tend to decrease. 2. In masseter, asymmetry indices of muscular activity at the levels of 10%, 20% of maximum occlusal force were -10.34 and -1.24%, so that muscular activity of non-clenching side were dominant and at the levels of 30%, 40% and 50% each of maximum occlusal force, muscular activity was dominant on clenching side as 4.68, 7.18 and 10.9%. In anterior temporal muscle, asymmetry indices were 33.38%, 25.46, 2095, 10.23 and 15.45% at the levels of 10%, 20%, 30%, 40% and 50% each of maximum occlusal force, so that activity of clenching 15.45% at the levels of 10%, 20%, 30%, 40% and 50% each of maximum occlusal force, so that activity of clenching side was dominant than that of non-clenching side at all levels, but as the levels of occlusal force was increased, asymmetry indices of muscular activity was tend to decrease. 3. Between both sides, average electromyographic amplitudes of masseter and anterior temporal muscle were correlated, so that as the levels of occlusal force was increased, average electromyographic amplitudes of both side in same muscle were increased proportionally. But asymmetry indices between muscular activities of masseter and anterior temporal muscle were not correlated.

• Journal of Yeungnam Medical Science
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• 제10권1호
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• pp.37-47
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• 1993

인두편도 증식으로 인한 비호흡 장애가 치열 및 핵의 위치에 미치는 영향을 안모형태에 따라 비교 연구하기 위해 인두편도 증식으로 인두편도 절제술을 시행하기로 한 환자의 안모를 형태에 따라 mesofacial, brachyfacial, dolichofacial type으로 분류하여 각 type별로 20명의 환자를 설정하여 서로 비교 연구한 결과 1. 상악 구치부 치열궁 폭경에 있어서 안모 형태에 따른 유의한 차이를 보였으며, dolichofacial type의 안모를 가진 환자에서 가장 좁은 상악 구치부 치열궁 폭경을 보였다. 2. 혀의 수직적 위치에 있어서 안모형태에 따른 유의한 차이를 보였으며, dolichofacial type의 안모를 가진 환자에서 혀가 가장 하방에 위치함을 보였다.