• 제목/요약/키워드: molar distalization

검색결과 41건 처리시간 0.016초

Immediate changes in the mandibular dentition after maxillary molar distalization using headgear

  • Kang, Sung-Ja;Kim, Hyun-Hee;Hwang, Hyeon-Shik;Lee, Kyung-Min
    • 대한치과교정학회지
    • /
    • 제47권2호
    • /
    • pp.142-147
    • /
    • 2017
  • The purpose of this study was to investigate immediate changes in the mandibular dentition after maxillary molar distalization using headgear in non-growing patients. Sixteen patients (mean age, $18.9{\pm}2.0$ years) with Class II molar relationship and crowding were included in the present study. To correct the molar relationship, headgear was used for maxillary molar distalization. Cone-beam computed tomography-generated half-cephalograms (CG Cephs) and dental casts were used to evaluate dental changes for each subject before and immediately after molar distalization using headgear. The mean duration that subjects wore the headgear was 6.3 months. CG Cephs showed that the first maxillary molars were distalized $4.2{\pm}1.6\;mm$ with $9.7^{\circ}{\pm}6.1^{\circ}$ of distal angulation. The intercanine, interpremolar, and intermolar widths of the mandible increased after maxillary molar distalization. The present study's results suggest that maxillary molar distalization using headgear induces a spontaneous response in the untreated mandibular dentition of non-growing patients.

A reliable method for evaluating upper molar distalization: Superimposition of three-dimensional digital models

  • Nalcaci, Ruhi;Kocoglu-Altan, Ayse Burcu;Bicakci, Ali Altug;Ozturk, Firat;Babacan, Hasan
    • 대한치과교정학회지
    • /
    • 제45권2호
    • /
    • pp.82-88
    • /
    • 2015
  • Objective: The aim of this study was to evaluate the reliability of measurements obtained after the superimposition of three-dimensional (3D) digital models by comparing them with those obtained from lateral cephalometric radiographs and photocopies of plaster models for the evaluation of upper molar distalization. Methods: Data were collected from plaster models and lateral cephalometric radiographs of 20 Class II patients whose maxillary first molars were distalized with an intraoral distalizer. The posterior movements of the maxillary first molars were evaluated using lateral cephalometric radiographs (group CP), photocopies of plaster models (group PH), and digitized 3D models (group TD). Additionally, distalization and expansion of the other teeth and the degrees of molar rotation were measured in group PH and group TD and compared between the two groups. Results: No significant difference was observed regarding the amount of molar distalization among the three groups. A comparison of the aforementioned parameters between group PH and group TD did not reveal any significant difference. Conclusions: 3D digital models are reliable to assess the results of upper molar distalization and can be considered a valid alternative to conventional measurement methods.

Zygoma-gear를 이용한 구치부 후방이동을 통한 비발치 치험례 (Zygoma-gear appliance for intraoral upper molar distalization)

  • Nur, Metin;Bayram, Mehmet;Pampu, Alper
    • 대한치과교정학회지
    • /
    • 제40권3호
    • /
    • pp.195-206
    • /
    • 2010
  • 본 증례보고에서는 골격성 II급 관계를 보이는 16세 여자 환자에서 zygomatic-anchorage plates (Zygoma-gear Appliance, ZGA)를 이용하여 상악 구치를 후방 이동시킴 구내 장치를 소개하고자 한다. 이 장치는 양측성 zygomatic anchorage plates, inner-bow와 강한 힘을 내는 구강 내 고무줄로 구성되어 있다. 3개월 내에 상악 구치의 후방 이동이 이루어 졌으며, 측모 두부 방사선 사진 분석 결과, 상악 구치는 4mm 후방 이동, $4.5^{\circ}$ 후방 경사되었다. 본 연구 결과 ZGA 장치를 이용해 고정원 소실 없이 단기간에 상악 구치의 후방 이동이 효과적으로 이루어졌음이 확인되었으며, 이를 통해 구치의 후방 견인이 요하는 증례에서 구외 장치 대신 사용될 수 있을 것으로 판단된다.

Anatomical factors of the maxillary tuberosity that influence molar distalization

  • Diego Fernando Lopez;David Acosta Olmos;Monica Andrea Morales
    • 대한치과교정학회지
    • /
    • 제54권4호
    • /
    • pp.239-246
    • /
    • 2024
  • Objective: To examine the areas of the maxillary tuberosity (MT) (coronal, apical, width, and height) with respect to the presence or absence of the third molar to establish possible anatomical limitations for molar distalization. Methods: A total of 277 tuberosities were evaluated through sagittal computed tomography (CT) images, divided for measurement into coronal (free of bone), apical (area of influence of the maxillary sinus), and tuberosity (bony area) zones, and stratified by the presence or absence of the third molar, sex, and two age subgroups. Mann-Whitney U test was used to compare the groups considering the third molar. Results: The medians of the width and height of the tuberosity decreased significantly in the absence of the third molar (P < 0.001). The apical area also showed differences, with negative values in the absence of the third molar and positive values in the presence of the third molar (P < 0.001). However, no differences were observed for the coronal area (P > 0.05). Conclusions: In the absence of the third molar, the size of the MT, represented by its width and height, was smaller and negative values (decrease) were observed for the maxillary sinus. The sagittal CT provides useful information regarding the amount of bone tissue available for distalization and relationship of the second molar with respect to the maxillary sinus, which allows individualizing each case in relation to the amount and type of movement expected.

Frog appliance를 이용한 상악 대구치의 원심 이동: 증례 보고 (The frog appliance for upper molar distalization: a case report)

  • Bayram, Mehmet;Nor, Metin;Kilkis, Dogan
    • 대한치과교정학회지
    • /
    • 제40권1호
    • /
    • pp.50-60
    • /
    • 2010
  • 본고의 목적은 2급 1류 치열안면 구조를 가지는 한 환자에 적용된 새로이 고안된 상악 대구치 원심 이동 장치인 Frog appliance의 효과를 평가하기 위함이다. 11세의 여자 환자가 교정 치료를 위해 본 진료실로 의뢰되었다. 환자는 미약한 2급 골격관계와 2급의 대구치 및 견치 관계를 양측 모두에서 보이고 있었다. 고정성 장치 치료를 통해 양측 상악 제1대구치를 원심 이동시키는 방법을 포함하는 치료 계획을 수립하였으며 상악 대구치를 원심 이동하기 위해 새로이 고안된 Frog appliance를 제작 및 적용하였다. 측모 두부방사선 사진으로 치료 결과를 평가하였으며 상악 제1대구치의 원심 이동이 4개월의 치료 기간 동안 이루어 졌고 1급의 구치 관계가 얻어졌다. 총 치료 기간은 16개월이 소요되었다. 두부방사선 사진을 평가한 결과 약간의 고정원 상실과 함께 대구치의 원심 이동이 치축 이동에 가깝게 일어난 것을 확인하였다. 결론적으로 Frog appliance는 환자의 협조를 요하지 않는 장치로서 간단하고 효과적으로 양측 대구치의 원심이동을 이룰 수 있는 구내 장치이다.

근심이동된 상악 대구치에서 Open Coil Jig 장치를 이용한 치험례 (DISTALIZATION OF THE MESIAL DRIFTED UPPER FIRST MOLAR WITH OPEN COIL JIG IN THE MIXED DENTITION: A CASE REPORT)

  • 김병창;김진태
    • 대한소아치과학회지
    • /
    • 제21권2호
    • /
    • pp.486-490
    • /
    • 1994
  • Maxillary first molar is the key in normal occlusion. Mesial drifting of maxillary first molar result form early loss of second deciduous molar. Mesial drifted maxillary first molar was treated by headgear, Hawley appliance with screw, brasswire, etc. But, these appliance should be necessary for patients cooperation. Recently, several appliance for molar distalizing without patients cooperation has been introduced. We are reporting in this paper about distalizing of mesial drifted maxillary first molar because of early loss of deciduous second molar by open coil jig. Distalization of molar by open coil jig is predictable, rapid, painless method without mecesscity of patient cooperation.

  • PDF

Combined treatment with headgear and the Frog appliance for maxillary molar distalization: a randomized controlled trial

  • Burhan, Ahmad Sharafeddin
    • 대한치과교정학회지
    • /
    • 제43권2호
    • /
    • pp.101-109
    • /
    • 2013
  • Objective: To evaluate the efficiency of the Frog appliance (FA) alone or in combination with headgear for distalizing the maxillary molars. Methods: Fifty patients (25 males and 25 females) aged 12.6 - 16.7 years who received treatment for Class II malocclusion at the Orthodontic Clinic of Al-Baath University were selected for this study and randomly divided into 2 equal groups. Maxillary molar distalization was achieved using the FA alone (group 1) or a combination of the FA with high-pull headgear worn at night (group 2). Lateral cephalograms were obtained before and after treatment. Results: The maxillary molars moved distally by 5.51 and 5.93 mm in groups 1 and 2, respectively. Distal movements were associated with axial tipping by $4.96^{\circ}$ and $1.25^{\circ}$, and with loss of anchorage by mesial movement of the second maxillary premolars by 2.70 and 0.90 mm in groups 1 and 2, respectively. The combined use of the FA and nighttime high-pull headgear decreased the distalization time and improved the ratio of maxillary molar distalization movement relative to the overall opening space between the first maxillary molars and second premolars. Conclusions: The FA can effectively distalize the maxillary molars, this distalization associates with some unfavorable changes. Nighttime use of high-pull headgear combined with the FA can reduce these unfavorable changes and improve treatment outcomes.

A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage

  • Kang, Ju-Man;Park, Jae Hyun;Bayome, Mohamed;Oh, Moonbee;Park, Chong Ook;Kook, Yoon-Ah;Mo, Sung-Seo
    • 대한치과교정학회지
    • /
    • 제46권5호
    • /
    • pp.290-300
    • /
    • 2016
  • Objective: This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis. Methods: Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear. Results: An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances. Conclusions: The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.

Pendulum 장치를 이용한 상악 대구치의 원심이동 증례 (MAXILLARY MOLAR DISTALIZATION WITH A PENDULUM APPLIANCE)

  • 이현정;김영재;김정욱;장기택;이상훈;김종철;한세현
    • 대한소아치과학회지
    • /
    • 제35권3호
    • /
    • pp.523-531
    • /
    • 2008
  • 상악골과 치조골 전돌을 가진 II급 부정교합 증례 중 상악 치아 발치의 적응증이 아닌 경우와 하악 구치의 전방 이동을 허용할 수 없는 경우 상악 대구치의 원심이동 기법을 사용하게 된다. Pendulum 장치는 환자의 협조도 없이 상악 대구치를 원심 이동시킬 수 있는 효과적인 장치로 소구치를 안정화시키며, 구개측 고정원을 이용할 수 있다. 하지만 구치부 정출로 하안면 고경이 증가할 수 있고, 전치부 전방 이동이 동반되며, 추벽부 조직에 손상을 줄 수 있으므로 장치의 사용과 환자 선택에 신중을 기해야 한다. 이에 pendulum 장치를 사용하여 상악 대구치를 원심 이동시킴으로써 공간 문제를 해결하고, 대구치 관계를 개선한 증례들을 보고하는 바이다.

  • PDF

미니스크류를 이용한 상악구치부 후방이동장치 효과 (Noncompliance screw supported maxillary molar distalization in a parallel manner)

  • Nalcaci, Ruhi;Bicakci, Ali Altug;Ozan, Fatih
    • 대한치과교정학회지
    • /
    • 제40권4호
    • /
    • pp.250-259
    • /
    • 2010
  • 상악 구치의 후방이동을 위한 구강 내 장치 중 환자의 협조를 필요로 하지 않는 방법은 제II급 부정교합의 개선에 성공적으로 널리 사용되고 있다. 본 연구는 스크류에 의해 지지되는 구강 내 후방이동 장치를 소개하고 그 효율성을 조사하고자 하였다. Angle Class II 부정교합으로 진단된 21명의 환자(여자 11명, 남자 10명; 평균 연령 14.9세)를 대상으로 하였다. 2개의 스크류를 incisive foramen 후방에 식립하고, 식립한 즉시 힘을 주어 상악 제1대구치의 후방이동에 사용하였다. 상악 구치를 후방이동시켜 제I급 구치관계를 얻기 위해 스크류에 의해 지지되는 구강 내 후방이동 장치를 사용하였다. 치료 전후 측모두부 방사선 사진과 3차원 모델 분석을 통해 골격 및 치아의 변화를 평가하였다. 연구결과 상악 구치는 평균 3.95 mm 후방이동하였고, 추가적인 고정원 소실 없이 제I급 구치관계를 확립하였다. 상악 대구치는 $1.49^{\circ}$ 후방경사 되었고, 회전된 정도는 좌우 각각 $0.74^{\circ}$, $0.54^{\circ}$으로 통계적으로 유의성 있는 변화를 보이지 않았다 (p > 0.05). 새롭게 고안된 장치는 스크류에 의해 지지되어 환자의 협조도를 요하지 않으며 특별한 고정원 소실 없이 구치의 치체이동을 통한 후방이동을 얻는 데 효과적인 것으로 판단된다.