Rotational control in orthodontics
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Rotational control in orthodontics
- 3. PERIODONTIUM • 2 Mineralized components are (a) cementum, (b) Alveolar bone • 2 Fibrous components (a) periodontal ligament (b) laminapropria of gingiva www.indiandentalacademy.com
- 4. PERIODONTAL LIGAMENT The periodontal ligament occupies the periodontal space , which is located between cementum and the periodontal surface of the alveolar bone PRINCIPLE FIBRES Alveolar crestal group This group radiate from the crest of the alveolar process and attach themselves to the cervical part of the cementum www.indiandentalacademy.com
- 5. MECHANICS FORCE CENTRE OF RESISTANCE CENTRE OF ROTATION COUPLE www.indiandentalacademy.com
- 6. REMOVABLE APPLIANCES BEGGS MECHANOTHERAPY PRE ADJUSTED EDGEWISE MECHANOTHERAPY TIP EDGE MECHANOTHERAPY EDGE WISE MECHANOTHERAPY ROTATION CONTROL BY VARIOUS APPLIANCES www.indiandentalacademy.com
- 7. BEGG’ S MECHANOTHERAPY (1) Vertical looped arch wires plays a great role in rotating the central and lateral incisors . (2) Rotating springs made of 0.014 “ wire provides a positive force and rotates all teeth . It establishes a two point contact between the tooth and the arch wire .www.indiandentalacademy.com
- 8. (3) BRACKET OFFSETTING The brackets are not placed in the center of the tooth instead it is placed according to the rotation . (4) LINGUAL BUTTONS pre assembled on thin 0.004” base are used as points of engagement for rubber elastics and elastic threads. www.indiandentalacademy.com
- 9. (5) ROTATION OF SEVERELY ROTATED MOLAR TOOTH . There are occasions when the molars are so badly rotated , or when the bicuspids are so buccal or both , the arch wire engagement in the molar tube is impossible . The procedure of choice is to make a 2 point contact between the distal end of the arch wire and the molar tube. www.indiandentalacademy.com
- 10. (1) BRACKET SYSTEMS (2) STEINERS METAL WEDGES (3) RUBBER ROTATIONAL WEDGES (4) “ L “ LOOPS & “ R “ LOOPS (5) TRANS PALATAL ARCHES (6) LINGUAL CLEATS (7) INTIAL WIRES PRE ADJUSTED EDGE WISE MECHANOTHERAPY www.indiandentalacademy.com
- 11. BRACKET SYSTEMS Double width bracket ( Twin bracket ) Single width bracket ( Lang bracket ) ( Lewis bracket ) www.indiandentalacademy.com
- 12. EDGE WISE MECHANOTHERAPY & TIP EDGE MECHANOTHERAPY www.indiandentalacademy.com
- 13. POST TREATMENT * CIRCUMFERENTIAL SUPRA CRESTAL FIBROTOMY *OVER CORRECTION * PERMANENT RETAINERS * POSITIONERS RETENTION www.indiandentalacademy.com
- 14. DURING TREATMENT * “ T “ PINS * WINGS IN THE BRACKET www.indiandentalacademy.com