• Title/Summary/Keyword: 하악 전치

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THE POSITION OF THE INCISORS IN CORRELATION TO ANB ANGLE, PROCUMBENCY AND INCLINATION IN KOREAN NORMAL OCCLUSION (한국인 정상교합에 있어서 전치의 위치와 ANB각, 돌출도, 경사도와의 상관관계에 관한 두부 방사선 계측학적 연구)

  • Chang, Sang Hun
    • The korean journal of orthodontics
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    • v.2 no.1
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    • pp.7-14
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    • 1971
  • 저자는 한국인 정상교합에 있어서 상하악 전치의 위치가 ANB각과 어떠한 상관관계가 있는지 그리고 전치의 위치가 돌출도와 경사도와 상관관계가 있는 지를 조사 연구하기 위하여 $20\~24$세 연령의 남자 54명, 여자 56명 합계 110명의 한국인 정상교합의 측모두부 X-선사진을 사용 분석했다. 이의 통계분석은 Computer 과정을 거쳤으며 다음과 같은 결과를 얻었다. 1. 상하악 전치 경사는 ANB각과 밀접한 상관관계가 있고, 상악전치의 위치는 ANB각에 (-)상관관계 하악전치의 위치는 ANB각에 (+) 상관관계가 있으며 이는Steiner 분석법의 acceptable compromise에서 보여준 것과 유사한 경향을 나타냈다. 2. 상악전치 경사는 상악돌출도와 (-) 상관관계가 있다. 3. 1-NA각은 상악경사도와 상호독립적이다. 4. 1-NA각은 하악돌출도와 하악경사도와 의의있는 상관관계를 나타냈다. 5. 1-NA거리와 상악경사도와의 상관관계는 여성군에서만 의의있는 것으로 나타났다. 6. 하악전치치축경사는 하악돌출도와 하악경사도와는 남성군에서만 상관관계가 있고 여성군에서는 의의가 없는 것으로 나타났다.

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Malocclusion with Congenital Missing of Lower Incisors (하악 전치의 선천적 결손을 동반한 부정 교합의 치험례)

  • Kim, Kyung-Ho;Choy, Kwang-Chul;Chung, Kil-Yong;Yun, Hee-Sun
    • The korean journal of orthodontics
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    • v.28 no.6 s.71
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    • pp.981-989
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    • 1998
  • Positions, angulation and mesiodistal dimension of lower incisors are important in esthetics, occlusion and post-treatment stability of tower arch. When lower incisor is congenitally missing, problems such as increased overjet and overbite, closing in of adjacent teeth and size/space discrepancies may occur. When creating treatment plans, incisor position and angulation, lip support, anteroposterior skeletal relationship canine-molar relationship, overjet overbite, remaining growth potential, crowding and anterior tooth ratio have to be considered. For an accurate analysis of incisal size discrepancy, diagnostic model set-up may be helpful. The two patients in this presentation both had two lower incisor missing, but the degree of crowding, skeletal relationship, lip support, molar relationship are different and therefore treatment plan was different as well. Long term follow-up may be necessary for stability and retention.

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Treatment plan for missing mandibular 4 incisors (하악 4전치 상실시 치료 계획)

  • Hahn, Kwang Jin
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.25 no.1
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    • pp.25-34
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    • 2016
  • Treatment of missing mandibular 4 incisors is often thought to be easier then other place during surgical and prothetic procedure. But clinicians encounter unexpected difficulties such as restricted implant site due to mesio-distal width of mandibular incisors, limited space as a result of crowing and mesial drift, esthetic problem after severe alveolar bone resorption, and difficulties of provisionalization Through cases, possible treatment options for missing mandibular incisors would be discussed. Treatment options for missing mandibular 4 incisors Place narrow type implant or one body mini implant on exact tooth position when there is no bone resorption Regular size implant on interseptal bone area when there is severe bone resorption Consider using resin bonded bridge(resin retained bridge/resin bonded fixed partial denture) as a tentative prosthesis when patient resists extracting remaining incisors with poor prognosis.

3-D FEA on the intrusion of mandibular anterior segment using orthodontic miniscrews (교정용 미니스크류를 이용한 하악 전치 함입 시 변위양상의 3차원 유한요소분석)

  • Park, Hyun-Kyung;Sung, Eui-Hyang;Cho, Young-Soo;Mo, Sung-Seo;Chun, Youn-Sic;Lee, Kee-Joon
    • The korean journal of orthodontics
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    • v.41 no.6
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    • pp.384-398
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    • 2011
  • Objective: The purpose of this study was to analyze the stress distribution and the displacement pattern of mandibular anterior teeth under various intrusive force vectors according to the position of orthodontic miniscrews and hooks, using three-dimensional finite element analysis. Methods: A three-dimensional finite element model was constructed to simulate mandibular teeth, periodontal ligament, and alveolar bone. The displacement of individual tooth on three-dimensional planes and the von Mises stress distribution were compared when various intrusion force vectors were applied. Results: Intrusive forces applied to 4 mandibular anterior teeth largely resulted in remarkable labial tipping of the segment according to the miniscrew position. All 6 mandibular anterior teeth were labially tipped and the stress concentrated on the labiogingival area by intrusive force from miniscrews placed mesial to the canine. The distointrusive force vector led to pure intrusion and the stress was evenly distributed in the whole periodontal ligament when the hook was placed between the central and lateral incisors and the miniscrew was placed distal to the canine. Conclusions: Within the limits of this study, it can be concluded that predictable pure intrusion of the 6 anterior teeth segment may be accomplished using miniscrews placed distal to the canine and hooks located between the central and lateral incisors.

Esthetic restoration in mandibular anterior region with one-piece implant and immediate loading (하악 전치부에서의 일체형 임플란트 식립 후 즉시부하)

  • Yoon, Sena
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.27 no.2
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    • pp.97-104
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    • 2018
  • Mandibular anterior region has high implant survival rates and better accessibility compared with any other region. Even if there are possibilities for perforation on lingual cortical bone due to improper drilling and bleeding caused by lingual artery damage, mandibular anterior region is a safe region because less amount of major anatomical structures exist compared with other regions. However, because of narrow bucco-lingual width of alveolar ridge, it is challengeable to obtain esthetic implant prosthesis. Although patients are less sensitive subjectively, mandibular anterior region is as difficult as maxillary anterior region in that implant placement location plays a critical role on the prognosis of implant prosthesis. One-piece implant is a very useful option for mandibular anterior region. Considering the narrow roots and thin alveolar bone of mandible, it is clinically difficult for implant diameter to be greater than 3mm In this case, we could approach the esthetic restoration in mandibular anterior region with one-piece implant and immediate loading.

Differences in mandibular anterior alveolar bone thickness according to age in a normal skeletal group (정상골격군에서의 연령에 따른 하악 전치부 치조골 두께의 차이)

  • Choe, Harry-Yun;Park, Won;Jeon, Jong-Kook;Kim, Yeon-Hwan;Shon, Byung-Wha
    • The korean journal of orthodontics
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    • v.37 no.3 s.122
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    • pp.220-230
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    • 2007
  • Objective: The purpose of this study was to determine the changes of mandibular anterior alveolar bone thickness with age. Methods: Cephalometric radiographs of 160 skeletal class I patients (male 80, female 80) with normal vertical growth pattern was investigated by measuring the buccolingual thickness of mandibular alveolar bone on the basis of root axis. Results: As the age increases, both male and female showed a significant decrease in buccolingual width of the mandibular anterior alveolar bone and in the width of mandibular anterior lingual alveolar bone except the CEJ area of females. However, there was no significant difference in the thickness of mandibular anterior buccal alveolar bone and in the width of maximum prominence of mandibular symphysis with age. Conclusion: From the above results, it is concluded that Korean children whose growth pattern is sagittally skeletal class l with a vertical normal growth pattern have a greater mandibular anterior lingual alveolar bone width than Korean adults; therefore, lingual movement of mandibular incisors, which is usually accompanied in extraction treatment, is considered to be more preferable in younger patients.

ORTHODONTIC TREATMENT THROUGH EXTRACT10N OF UPPER AND LOWER LATERAL TEETH (상하악 측절치 발거를 통한 전치부 총생의 치료)

  • Park, Sang-Hyun;Lee, Kwang-Hee;Kim, Dae-Eop;Lee, Jong-Seon
    • Journal of the korean academy of Pediatric Dentistry
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    • v.28 no.4
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    • pp.547-552
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    • 2001
  • Extracting mandibular incisors for orthodontic treatment may adversely affect the occlusion. However, when properly used, extraction of mandibular inciors is a selection for the correction of the malocclusion. Generally, treatment for crowding needs to select between nonextraction and four premolar extraction. Approaches for crowded mandibular incisors include distal movement of posterior teeth, lateral movement of canines, labial movement of incisors, interproximal enamel reduction, removal of premolars, removal of one or two incisors, and various combinations of the above. Extraction of incisors is used in case of crowding, anterior tooth size discrepancy, absent of maxillary lateral incisors, and ectopic eruption. But severe overjet. overbite, and space are the contraindication of it. A patient had severe crowding on upper anterior teeth, impacted upper left lateral incisor, palatal ectopic eruption of upper right incisor and severe crowding on lower anterior teeth. Lower lateral incisors are extracted for space availability and facial esthetics. We report the case of orthodontic treatment of upper and lower anterior crowding through extraction of lateral incisor.

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Morphological difference of symphysis according to various skeletal types using cone-beam computed tomography (안면골격 유형에 따른 하악 전치 치조골의 형태 차이: Cone-beam CT를 이용한 정량적 평가)

  • Kwon, Hyun-Jin;Chun, Youn-Sic;Kim, Min-Ji
    • Journal of Dental Rehabilitation and Applied Science
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    • v.30 no.3
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    • pp.215-222
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    • 2014
  • Purpose: The aim of this study was to investigate differences between the morphology of the mandibular symphysis and four facial skeletal types. Materials and Methods: 40 cone-beam computed tomographies were selected and classified in to 4 groups according to their vertical and anterior-posterior skeletal patterns. The bone volume ($mm^3$) of the symphysis, the cross sectional area corresponding to the 4 mandibular incisors' axis: the cross sectional area of total bone ($mm^2$), the area of the cancellous bone ($mm^2$) and the thickness (mm) of labial and lingual alveolar bone at 2 mm, 3 mm under the cemento-enamel junction (CEJ) were measured. General linear model (GLM), Kruskal-Wallis test and Tukey honestly significant difference (HSD) test were subsequently used for statistical analysis. Results: The lingual cortical bone thickness of the lateral incisors at 2, 3 mm under CEJ was greater in the Class I low angle group than the other 3 groups (P < 0.05). There were no statistically significant differences in the volume of the mandibular incisor bony support, cross-sectional area of total bone and cancellous bone at the mandibular incisor' axis. Conclusion: Patients in Class I, low angle group have a thicker lingual mandibular symphysis than Class I, high angle patients.

A CASE OF BILATERAL SUPERNUMERARY TEETH IN THE MANDIBULAR INCISOR REGION : A CASE REPORT (하악 전치부에 양측성으로 발생한 과잉치의 치험례)

  • Jeong, Nae-Jeong;Kim, Jung-Wook;Kim, Chong-Chul;Lee, Sang-Hoon
    • Journal of the korean academy of Pediatric Dentistry
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    • v.28 no.1
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    • pp.142-145
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    • 2001
  • Supernumerary tooth is one of the abnormalities in tooth number. Supernumerary tooth result from excessive proliferation of dental lamina and incidence reports identify a range of $0.3\sim0.8%$ in primary dentition, $1.0\sim3.5%$ in permanent dentition with males being affected twice as frequently as females, maxilla nine times as frequently as mandible The incidence is more in anterior tooth region than in posterior region. The most common supernumerary tooth is the mesiodens, which located between maxillary central incisors. The occurrence is very rare in the incisor region of mandible and the reports on incidence is 2%. In this case, there were two supernumerary teeth in the mandibular region and we could acquire normal alignment of mandibular incisors by extraction and orthodontic treatment.

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Lower Incisor Extraction for Dental Camouflage (하악전치발치를 통한 교정)

  • Lee, Won-You;Lee, Young-Taek
    • The korean journal of orthodontics
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    • v.27 no.4 s.63
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    • pp.661-668
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    • 1997
  • There is a variation in the range of normal occlusion, and we must fit our treatment to the needs of each patient. If the upper or lower incisors are congenital)y missing, malformed, or crowded, the extraction of the incisor has some advantages over the extraction of premolars and nonextractions. The advantages are 1)simple mechanics, 2)reduced treatment time, 3)less relapse tendency, and 4)fewer facial profile changes. In order to decide which incisor should be extracted, we must consider certain factors 1)discrepancies in anterior arch length, 2)anterior tooth ratio, 3)periodontal and tooth health condition, and 4)the relationship between the upper and lower midline. Diagnostic set-up can be helpful to plan the treatment and show us the post treatment result.

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