[치아교정 1] Classification of anchorage
작성자 매직키스 날짜 13-05-01 17:29
 
 
Classification of anchorage
1. Tooth-borne - Differential force concept
- Differential moment concept
2. Muscular
3. Extraoral anchorage
4. Bone anchorage

1. Tootho-borne
1) Differential force concept
- molar teeth vs. anterior teeth
- threshold force level을 결정하기 어렵다.
2) Differential moment concetp
- root movement vs. tipping movement
- unwanted vertical force
- canine angulation
- problem in six ant.teeth retraction
2. Muscular anchorage
- Brachyofacial vs. Dolichofacial
- Tongue : lingual orthodontics
3. Extraoral anchorage
- reliable but patient compliance 필요 → unreliable
4. Bone anchorage
- only reliable anchorage
- implant, onplant, miniplate, surgical screw

* Class II elastic의 side effect
하악 치열이 retraction되었다가 앞으로 나오면서 gingival recession되는 일이 있다.
 
 
 
Maximum anchorage
- selective extraction (4,5 번 선택적으로)
- complicate treatement mechanics : different force & different moment
- patient compliance
- inevitable loss of anchorage (약 1/3 정도)


 

Classification of anchorage according to available of extraction space
1. absolute : anchor loss가 전혀되지 않아야 할 때
2. maximum : 약 1/3 정도의 anchor loss 고려
3. moderate
4. minimum

* Absolute anchorage
Bone anchorage - Miniscrew & Miniplate - implant
 
 
 
Bone anchorage
- reliable
- implant : 치료 시간 길며, 적절한 위치를 찾기 어려움. (교정환자들은 대부분 치아가 많으므로)
- surgical screw : 위치 선정이 용이, 직경이 implant에 비해 작으므로 식립 용이.
limited stabiity