Mechanics sequence for extraction treatment
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Mechanics sequence for extraction treatment
- 1. Mechanics Sequence for Extraction Treatment www.indiandentalacademy.com
- 2. Extraction Mechanics • Four general procedures : 1 Stabilization of upper and lower molar anchorage. 2 Retraction and uprighting of cuspids with sectional arch mechanics. 3 Retraction and consolidation of upper and lower incisors. 4 Continuous arches for details of ideal and finishing occlusion. www.indiandentalacademy.com
- 3. Extraction Mechanics 1. Stabilization of upper and lower molar anchorage: a) Maximum upper molar anchorage. Nance arch with modifications. Headgear . www.indiandentalacademy.com
- 4. Extraction Mechanics b) Moderate upper molar anchorage: Palatal bar. Quad helix. Upper utility arch. www.indiandentalacademy.com
- 5. c) Minimum upper molar anchorage: Vertical closing loop. Double delta loop. www.indiandentalacademy.com
- 6. Extraction Mechanics • Maximum lower molar anchorage: Lower utility arch-four mechanical adjustments: i) Buccal root torque ii) Buccal expansion of the molars to support the torque iii) Tipback of 30 to 40 deg, for molar uprighting. iv) Distal molar rotation to keep upper molar in a proper functioning occlusion. www.indiandentalacademy.com
- 7. Extraction Mechanics • Moderate lower molar anchorage: Lower utility with adjustments. www.indiandentalacademy.com
- 8. Extraction Mechanics • Minimum lower molar anchorage: Eliminate the four mechanical factors. Round wires may be used. www.indiandentalacademy.com
- 9. Extraction Mechanics 2. Retraction and uprighting of cuspids with sectional arch mechanics. • Cuspids need to be kept in the narrow trough of trabecular bone and avoid the severe tipping or displacement • The activation of the cuspid retraction springs should produce 100 to 150 grams of force www.indiandentalacademy.com
- 14. Extraction Mechanics 3. Retraction and consolidation of upper and lower incisors. Lower incisors: • Very light continuous forces (150 grams) Contraction utility Double delta retraction loops www.indiandentalacademy.com
- 16. Extraction Mechanics • Upper Incisors: Regular contraction utility. Upside down vertical closing loop. Double delta loop. www.indiandentalacademy.com
- 19. • References 1. Robert M Ricketts, Ruel W. Bench, Carl F.Gugino, James J. HIlgers, Robert J. Schulhof. Bioprogressive therapy. 1st Book. Rocky Mountain Orthodontics: 135-170. www.indiandentalacademy.com