Burstone’s T Loop
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Burstone’s T Loop
- 2. 10 mm 5 mm 2 mm 4 mm ALPHA (ANTERIOR) SEGMENT BETA (POSTERIOR) SEGMENT www.indiandentalacademy.com
- 3. • HOW TO USE T LOOPS FOR EXTRACTION SPACE CLOSURE • T-LOOPS vs VERTICAL LOOPS www.indiandentalacademy.com
- 4. HOW TO USE T LOOPS FOR EXTRACTION SPACE CLOSURE • POSITIONING OF THE LOOP DURING SPACE CLOSURE www.indiandentalacademy.com
- 5. • IN GROUP A ANCHORAGE PLACE THE TLOOP a)offcentered towards anteriors b)offcentered towards posteriors c)centered d)any of the above position www.indiandentalacademy.com
- 6. • What are preactivation bends? why are they given? www.indiandentalacademy.com
- 7. BIOMECHANICS • STATIC EQULIBRIUM PRINCIPLE www.indiandentalacademy.com
- 9. • What is moment to force ratio? What is its significance? www.indiandentalacademy.com
- 11. Consider the moment created when force is applied Mf and the counter balancing moment generated by the couple within the bracket Mc Mc/Mf = 0 –Pure tipping Crot and cres same,thus the tooth rotates around the Cres 0 < Mc/Mf >1- Controlled tipping – Crot displaced away from Cres – crown and root move in the same direction Mc/Mf = 1– Bodily movement – equal movement of crown and root Mc/Mf > 1 Torque – root apex moves further than thewww.indiandentalacademy.com
- 12. M/F 5 : 1 Uncontrolled tipping M/F 8 : 1 Controlled tipping M/F 10 : 1 Translation M/F >10 : 1 Root movement MOMENT TO FORCE RATIO FOR VARIOUS TOOTH MOVEMENTS www.indiandentalacademy.com
- 14. Off center bend Points in the direction of the force produced on the tooth Center bend Short segmentLong segment Points in the direction opposite of the force produced on tooth No short or long segment No force produced V - BEND PRINCIPLE www.indiandentalacademy.com
- 19. T loop vs vertical loop • FABRICATED IN TMA WIRE • LOW LOAD DEFLECTION RATE • HIGH YEILD STRENGTH • LESS CONSTANT FORCE • HIGHER MOMENT/FORCE RATIO • STAINLESS STEEL WIRE www.indiandentalacademy.com
- 23. GROUP B ANCHORAGE Distal force on anteriors Mesial forces on posteriors Equal potential for tooth mvt. Alpha moment Beta moment Horizontal force acting on both segments are same Moment to force ratio EQUAL EQUAL RETRACTION OF ANTERIOR PROTRACTION OF POSTERIOR www.indiandentalacademy.com
- 24. Group B ANCHORAGE CASE www.indiandentalacademy.com
- 25. • POSITION OF T-LOOP: D = L-A 2 D = Distance from the center of the loop to either the anterior bracket or posterior auxillary tube. L = Distance between the canine bracket and Molar tube. A = The millimeters of activation of the spring (usually 6 mm) www.indiandentalacademy.com
- 28. GROUP A ANCHORAGE Distal force on anteriors Mesial forces on posteriors Maximum potential for tooth mvt. Miminised or counteracted Decrease moment Increase moment Horizontal force acting on both segments are same Moment to force ratio Reactive unit Anchor unitwww.indiandentalacademy.com
- 29. Alpha moment Beta moment Anteriors posteriors Vertical forces created Extrusion When unequal or unbalanced Intrusion alpha beta alpha beta Intrusion Extrusion www.indiandentalacademy.com
- 30. • GIVE EQUAL ALPHA AND BETA BENDS AND PLACE THE LOOPS OFFCENTERED TOWARDS POSTERIORS • GIVE MORE BETA BEND AND PLACE THE LOOP OFFCENTERED TOWARDS ANTERIORS • GIVE EQUAL ALPHA AND BETA BENDS AND PLACE THE LOOPS AT CENTER AND USE HEADGEAR TO CONTROL THE POSTERIOR SEGMENT www.indiandentalacademy.com
- 32. T LOOP The preactivated spring with the anti tip and anti rotation BENDS ARE placed Activation on insertion is 6mm The m/f is 8:1 – controlled tipping Now as the tooth moves the activation reduced to 4mm – the force is reduced M/f ratio is increased - bodily movement further The activation is reduced to 2mm – force is further reduced M/f ratio increased – 12:1 Root uprighting www.indiandentalacademy.com