Anchorage is the resistance to unwanted tooth movement(錨定就是對於不需要的牙齒移動所產生的抵抗)
Anchorage may be derived from four sources:(錨定的來源)
- Teeth (牙齒)
- Oral mucosa and underlying bone (口腔粘膜與周邊組織)
- Implants (植體)
- Extra oral(口外)
several causes of loss of anchorage. Some examples of these are:(錨定喪失的產生因素)
- Poor appliance design (裝置的不良設計)
- Poor appliance adjustment (裝置的不良調整)
- Poor patient wear(病人使用不當)
(1a) A distalising force on the upper canine will produce a reciprocal force in the opposite direction on the anchor teeth. Provided the force level for bodily movement is kept low at about 100g then there will be minimal mesial movement of the anchor teeth. (1b) As the distalising force level increases the reciprocal forces also increase with a greater risk of loss of anchorage. (1c) The combined root surface area of the anterior teeth is almost the same as the molar and premolar. Attempting to move all the anterior teeth distally simultaneously will result in an equal mesial movement of the posterior teeth
Anchorage control and distal movement(非常棒的文章,務必看!!)
留言列表
