• 대한치과교정학회지
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• 제24권2호
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• pp.247-273
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• 1994

The purpose of this study was to evaluate the dental arch morphology and the occlusal characteristics in the Koreans from the dental-anthropological point of view. The sample consisted of dental stone casts obtained from 120 Korean adults and 142 Japanese adults. Japanese casts and Caucasian data had been preserved at the Dept, of Orthodontics of Tokyo Medical and Dental University. Tooth size and dental arch morphology of the Koreans were compared with that of the Japanese. On the other hand, the variations of 30 crown traits, categorized and quantitatively graded, were compared between two peoples and the frequency distribution of each crown traits were analyzed by means of Chi-square test. The results were summerized as followings ; 1. There was a significant sexual difference in dental arch length and width in the Korean, in which male had a longer and wider dental arch than female. There was a close resemblance for dental arch morphology between the Koreans and the Japanese, except for a little longer mandibular arch of the Japanese. 2. In general, Korean male had wider crown than female, particulary in central incisor,canine,1st molar of maxilla and canine, 1st and 2nd molar of mandible with significance. The Korean had wider maxillary first molar, smaller mandibular first and second molar than the Japanese in both sex. 3. In crown traits of the Korean, shovel-shaped incisor showed lower frequency distribution than in the Japanese, but higher than in the Caucasians. Frequency of incisor reduction was shown higher distribution than in the Japanese and the Caucasians. Carabelli's tubercle showed higher frequency distribution than in Japanese, but remarkably lower than in Caucasians.

• 대한치과교정학회지
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• 제21권1호
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• pp.223-238
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• 1991

This study was carried out in order to findout the amount of tooth movement, the changes arch size and the changes in arch morphology following orthodontic treatment and to provide a guideline for to predict post-treatment arch morphology. The sample group for this study consists of 15 males and 22 females, totalling in 37 persons, who received orthodontic treatment at Orthodontic Department of Dankook Univ. Dental Hospital. They are classified into Extraction Class I treatment group (E I), Non-extraction Class I treatment group (N I), and Non-extraction Class III treatment group (N III), according to their pre-treatment malocclusion state and methods of treatment. Following conclusions and averaged dental arch form for each group were obtained by cephalometric linear measurements and dental arch measurements using pre- and post-treatment lateral cephalograms and plaster study models. 1. Intercanine width were reduced in max. of both EI and NI during the period of treatment, 2. Intermolar width were reduced in max. of EI and increased in max. of NI. Therefore although there was no difference between these two groups before the treatment, intermolar width of the max, of NI was wider than that of E1 after the treatment. 3. PMV-incisor distance and PMV-canine distance were decreased in both max. and mand. of EI and that of NI, during the period of treatment. PMV-molar distance was decreased in both max. and mand. of NI and in mand. of NIII. 4. Items that showed stability during the treatment were: max. & mand. PMV-molar distance, mand. intercanine and intermolar width in EI; mand. intercanine and intermolar width in NI; mand. & max. PMV-incisor distance, PMV-canine distance, max. PMV-molar distance and max. & mand. intercanine and intermolar width in NIII. 5. The differences in averaged canine and molar variances to post-treatment dental arch form were present only in EI and in NI. There was no variance between maxilla and mandible in each group.

• 대한치과교정학회지
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• 제41권4호
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• pp.224-236
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• 2011

본 연구는 정상교합자의 치열궁과 기저골 형태를 파악하기 위해 시행하였다. 정상교합자 27명(남-15명: 25Y $10M{\pm}4Y$ 4M/여-12명: 26Y $1M{\pm}7Y$ 4M)을 대상으로 두개골의 전산화 단층촬영을 시행하고 입체영상을 제작한 뒤, 상악 중절치의 FA point의 중점을 원점으로 하는 3차원 좌표계를 형성하였다. 또한 상악 교합평면과 평행한 면으로 절단하여 상하악의 치열궁과 기저골의 형태에 대해 분석하였다. 상하악기저골은 A point, B point 부위와 양측 제1대구치 부위의 좌표에서 통계적으로 유의한 차이가 나타나지 않았다. 또한 상하악의 치열궁은 기저골악궁에 비해 전치부에서 순측으로 위치하였다. 또한 치열궁과 기저골악궁의 협설측 교차는 상악은 대구치 부위에서, 하악은 소구치 부위에서 이루어졌다.

• 대한치과교정학회지
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• 제15권2호
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• pp.303-312
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• 1985

This study was designed to get the knowledge of the structural characteristics of the lingual dental arch shapes of Koreans. The subjects consisted of 107 normal occlusions. The lingual structure which was divided into two groups, anterior and posterior part, was measured and analyzed. 33 pairs of the 107 samples were used to test the derived results. The findings of this study were as follows: 1. The mathmatical functions of the 12 curves which showed good fitting to the upper and lower anterior lingual arch were derived and flawed to the same scale using the computer graphics. 2. The results of the test showed a reasonable degree of accuracy to all of the 33 random samples. 3. The average degrees of posterior flexions were obtained and could be used as a initial guide at the wire-bending.

• 대한치과교정학회지
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• 제22권3호
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• pp.675-690
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• 1992

The purpose of this study was to obtain the lingual morphology (size, angulation, contour, eminence) of adults with normal occlusion in order to provide the basic data for lingual bracket and lingual arch form in Korean. The subjects (Male: 50, Female: 50) were selected who have normal occlusion and dental casts were prepared. Tooth size, angulation, arch width, horizontal contour, lingual eminence were measured for all 28 teeth both upper and lower arch. The results were as follows: 1. Measuring items of all individual teeth for adults with normal occlusion were obtained. 2. In comparison tests, there was a statistically difference between intermolar widths $(\underline{6}\;to\;\underline{6})$ before occlusal reduction and intermolar width $(\underline{6}\;to\;\underline{6},\underline{7}\;to\;\underline{7})$ after occlusal reduction only all the other measuring items showed no statistically differences. 3. There was small variation in horizontal contour of lingual surface on lower incisors and upper and lower bicuspids. The other teeth showed somewhat greater variations. 4. There was offset between canine and bicuspid in upper arch while there was no prominent offset in lower arch.

• 대한치과교정학회지
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• 제27권6호
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• pp.871-880
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• 1997

본 연구에서는 치열심미지수(DAI)의 10가지 교합적 요소와 악안면 형태와의 상호관계를 단변수와 다변수 통계처리 기법을 이용하여 조사하였다. 자료는 교정치료를 위해 내원한 영구치열을 가진 182명(남자 79명, 여자 103명)의 치료전 연구모형과 측모 두부규격방사선 사진으로부터 얻었다. 악안면 형태를 분석하기 위해서 DiPaolo의 사변형 분석 방법을 이용하였으며 치열심미지수의 10가지 교합적 요소는 Jenny, Cons 등에 의해 발표된 진단기준에 따라 각 항목을 측정하여 기록하였다. 또한 안모의 심미관계도 조사하여 다음과 같은 결론을 얻었다. 1. 치열심미지수의 구성요소중 결손치수, 절치부 총생도, 절치부 공극도, 정중이개량, 상악전치부 최대 변이량등 대부분의 구성요소가 악안면 형태와 상관관계를 보이지 않았다. 2. 치열심지지수의 구성요소중 상악전치부 수평피개량, 하악전치부 수평피개량, 전 후방 구치관계 등은 시상면적 악골관계를 나타내는 골격요소인 MdBL/MxDL, MdLL/MxLL, MdSL/MxSL들과 상관관계를 보였다. 3. 치열심미지수의 구성요소중 전치부 수직 개방교합량은 수직적 악골관계를 나타내는 ALFM/AUFH, MPA, SA등과 미약한 상관관계를 보였다. 4. 교합의 여러 측면을 기초로 한 치열심미지수는 악안면 형태와 무관하였다. 5. 교정치료 필요 유무의 선별 및 부정교합의 심도에 관한 포괄적인 평가에는 어느 특정 지수에 의존하기보다는 교합적 요소와 악안면 골격적 요소 모두에 기초를 두어야 할 것으로 사료된다.

• 대한치과교정학회지
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• 제25권2호
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• pp.209-221
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• 1995

한국인에게 적합한 설측교정장치와 이상적인 설측 치열궁 아치와이어 제작의 기초자료를 얻기위하여 정상교합자 경석고 모형 30개를 재료로 하여 설측치관의 형태와, 후지타 설측 브라켓을 위치시킨 모형에서 설측치열궁 형태를 조사하여 다음과 같은 결과를 얻었다. 각 치아에 대한 치관의 근원심 경사도와 설면의 순설측 치관 경사도의 평균치를 얻었다. 각 치아에 대한 브라??? 위치에서 설면의 수평 및 수직적 형태를 얻은 결과 대구치, 소구치, 견치는 상하악이 비슷한 모양을 보였으며, 강하악의 중절치와 측절치도 비슷한 모양을 보여 각각 브라켓 기저부를 공유할 수 있을 것으로 나타났다. 브라켈 부착위치에서의 평균 설측치열궁 형태를 얻은 결과, 그 형태는 전치부는 반원형이며 견치와 소구치 사이에 강한 오프??? 밴드가 있는 버섯 형태로서 소구치간 및 제2소구치와 대구치간에도 오프??? 밴드가 필요한 것으로 나타났다. 남녀간의 평균 설측치열궁 형태는 상악은 거의 일치하였고 하악은 여자가 남자보다 다소 작은 형태를 나타내었다.

• 대한치과의사협회지
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• 제58권9호
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• pp.546-555
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• 2020

Allergic rhinitis is a specific IgE mediated inflammatory disease of the nasal mucosa, characterized by symptoms such as rhinorrhea, nasal congestion, nasal obstruction, nasal and eye itching, and sneezing. The prevalence of allergic rhinitis varies according to country, age, and surveying methods, but it seems to increase worldwide, also in Korea. Prolonged mouth breathing caused by allergic rhinitis can produce muscular and postural alterations, causing alterations on the morphology, position, growth direction of the jaws, and malocclusion. Also, mouth breathing leads to dryness of the mouth, causing various oral diseases; gingivitis, halitosis, inflammation of tonsil, increased risk of dental caries and dental erosion. In dental clinic, using rapid maxillary expansion to persistent allergic rhinitis patients with narrow maxilla can enlarge maxillary dental arch and nasal cavity anatomy, improving nasal breathing and reducing nasal cavity resistance. However, it is desirable to use along with otolaryngologic treatment. Dentists should be aware of the characteristics of allergic rhinitis and its effects on patients, and consider when planning dental treatment.

• 대한치과교정학회지
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• 제50권2호
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• pp.120-128
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• 2020

Objective: The aims of the present study were to evaluate the changes in the maximum lip-closing force (MLF) after orthodontic treatment with or without premolar extractions and verify the correlation of these changes with dentoskeletal changes. Methods: In total, 17 women who underwent nonextraction orthodontic treatment and 15 women who underwent orthodontic treatment with extraction of all four first premolars were included in this retrospective study. For all patients, lateral cephalograms and dental models were measured before (T0) and after (T1) treatment. In addition, MLF was measured at both time points using the Lip De Cum LDC-110R^® device. Statistical analyses were performed to evaluate changes in clinical variables and MLF and their correlations. Results: Both groups showed similar skeletal patterns, although the extraction group showed greater proclination of the maxillary and mandibular incisors and lip protrusion compared to the nonextraction group at T0. MLF at T0 was comparable between the two groups. The reduction in the arch width and depth and incisor retroclination from T0 to T1 were more pronounced in the extraction group than in the nonextraction group. MLF in the extraction group significantly increased during the treatment period, and this increase was significantly greater than that in the nonextraction group. The increase in MLF was found to be correlated with the increase in the interincisal angle and decrease in the intermolar width, arch depth, and incisor-mandibular plane angle. Conclusions: This study suggests that MLF increases to a greater extent during extraction orthodontic treatment than during nonextraction orthodontic treatment.

• International Journal of Oral Biology
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• 제32권1호
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• pp.13-22
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• 2007

The stem cell research is emerging as a cutting edge topic for a new treatment for many chronic diseases. Recently, dental stem cell would be possible for regeneration of tooth itself as well as periodontal tissue. However, the study of the cell characterization is scarce. Therefore, we performed the genetic profiling and the characterization of mouse fetus/neonate derived dental tissue and cell to find the identification during dental development. We separated dental arch from mandibles of 14.5 d fetal mice and neonate 0 d under the stereoscope, and isolated dental cells primarily from the tissues. Then, we examined morphology and the gene expression profiles of the primary cells and dental tissues from fetus/neonate and adult with RT-PCR. Primary dental cells showed heterogeneous but the majority was shown as fibroblast-like morphology. The change of population doubling time levels (PDLs) showed that the primary dental cells have growth potential and could be expanded under our culture conditions without reduction of growth rate. Immunocytochemical and flow cytometric analyses were performed to characterize the primary dental cell populations from both of fetus (E14.5) and neonate. Alpha smooth muscle actin (${\alpha}-SMA$), vimentin, and von Willebrand factor showed strong expression, but desmin positive cells were not detected in the primary dental cells. Most of the markers were not uniformly expressed, but found in subsets of cells, indicating that the primary dental cell population is heterogeneous, and characteristics of the populations were changed during culture period. And mesenchymal stem cell markers were highly expressed. Gene expression profile showed Wnt family and its related signaling molecules, growth factors, transcription factors and tooth specific molecules were expressed both fetal and neonatal tissue. The tooth specific genes (enamelin, amelogenin, and DSPP) only expressed in neonate and adult stage. These expression patterns appeared same as primary fetal and neonatal cells. In this study we isolated primary cells from whole mandible of fetal and neonatal mice. And we investigated the characteristics of the primary cells and the profile of gene expressions, which are involved in epithelial-mesenchymal interactions during tooth development. Taken together, the primary dental cells in early passages or fetal and neonatal mandibles could be useful stem cell resources.