Tooth movement can be achieved by the application of a force to the tooth by an orthodontic appliance.
1. Classify the tooth movement
2. Specify the magnitude of the force, the direction and point of application
3. Also provide an illustration with each movement. (scan in hand drawing or post photo of hand drawing)
Tipping is one of the movements, correct
ReplyDeleteClassify tooth movement:
ReplyDelete1.Tipping
2.Translation
3.Rotation
4.Intrusion
5.Extrusion
6.Torque
Specify the magnitude of force, direction and point of application:
1.Tipping
- Tipping is best carried out by a light, continuous force.
- During tipping, the crown and root are moved in opposite directions around a center of rotation within the root.
- Diagonally opposite areas of compression and tension are produced within the periodontal ligament.
2.Translation
- During translation or bodily movement, the crown and root are moved in the same direction at the same time.
- This movement usually is brought about by a couple.
- At first, a very light force is preferred.
- During the period of secondary response, forces of 150-200 Gm. are adequate for bodily movement of cuspids.
3.Rotation
- It is the movement of the tooth around its long axis.
- It is a complicated tooth movement, difficult to effect, difficult to retain.
- Most effective by dissipating forces with periods of stabilization between activations of the appliance.
- Relapse of rotations is especially prominent when the tooth has been rotated rapidly with a strong, continuous force.
4.Intrusion
- The movement of the tooth into the alveolus. Very light forces are used in the intrusion of teeth and when done, little relapse is seen.
- Intrusion is frequently relative, i.e., some teeth are intruded while others are extruded more easily.
5.Extrusion
- The movement of the tooth out of the alveolus, i.e. the root follows the crown.
- Most often needed in Class II Div 1 malocclusions with an open bite.
- Best carried out using very light, continuous force during rapid periods of alveolar growth.
- Heavy intermittent forces may result in relapse.
6.Torque
- Is a movement of the root without movement of the crown, i.e. a tipping movement with the fulcrum in the bracket area. In practice there is always some crown movement.
- Effects of torque vary with the area of the root studied.
- Undermining resorption is more likely to be seen in the apical portion of the root, where the forces are the greatest.
- Since force varies along the root surface, torque usually is expressed as the amount of force at the crest of the alveolar process.
- Forces of 50-60Gm. at the alveolar crest is adequate for most torquing movements.
Well done on collecting all the information
ReplyDelete