Tackling aniatrogenic problem /certified fixed orthodontic courses by Indian dental academy
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats. Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics, Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call 0091-9248678078
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Tackling aniatrogenic problem /certified fixed orthodontic courses by Indian dental academy
- 1. Tackling an iatrogenic problem!! INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
- 2. • Introduction All modern mechanics have a double scale of ladder ascendant & descendant , ascending from experiment to the invention of causes & descending from causes to the invention of new experiments • Anchorage plays a very vital role in orthodontics. Loss of anchorage can take place during • Aligning, leveling and retraction stages. www.indiandentalacademy. com
- 3. Reasons for anchor loss during aligning •Lower molars normally drift mesially to occupy the lee-way space after shedding of lower primary second molars which can be restricted by timely placement of lingual arch. •Anchorage requirement in upper arch is s re greater compared to lower arch e ma ti ng ti re d ge n ra U •Improper positioning of brackets. ho nc a www.indiandentalacademy. com ui q me re
- 4. Reasons for anchor loss during retraction excessive forces used during retraction . Improper bracket positioning iatrogenic factors posterior segments are not consolidated during retraction . www.indiandentalacademy. com incorrect alpha & beta bends Improper positioning of loop
- 5. Use light Continuous force During aligning…. Anchorage reinforceme nt HOW TO PREVENT ANCHOR LOSS ? When in doubt use a wire applying lighter forces www.indiandentalacademy. com Bracke t tip
- 6. How to control anchorage during leveling ? • Using light continuous forces • Maintain the direction of force • Rein force anchorage • Proper bracket positioning. www.indiandentalacademy. com
- 7. Anchorage control during retraction individual retraction enmasse Walking of canine Rein force anchorage www.indiandentalacademy. com
- 8. Anchorage reinforcement IO high cervi EO com bi cal TPA Nance button Class –II elastics Lingual arch www.indiandentalacademy. com straight
- 9. how to correct anchor loss ? Anchor loss occurs by mesial tipping of molars Extra oral Intra oral www.indiandentalacademy. com Hence distalize molars
- 10. Cervical pull High pull Extra oral Combi pull distalizing effect on molars and premolars www.indiandentalacademy. com
- 11. Inter maxillary Intra oral Intra maxillary Absolute anchorage www.indiandentalacademy. com
- 12. Intermaxillary Elastics Modular appliance IO non compliance appliances Intra maxillary Modified nance arch with NiTi coils distalising bow www.indiandentalacademy. com Absolute anchorage Palatal implants
- 13. APPLIANCE DESIGN: • Modular appliance is made up of 0.016 x0.0 22 rectangular SS / TMA wire • Modular appliance consists of an omega loop touching the mesial aspect of buccal tube and there is an upward curve in the mesial part of the canine bracket, which ends in a hook on the upper or gingival part. www.indiandentalacademy. com
- 14. •The gingival part of the hook is helicoidally recurred with the end inward to avoid erosion of the vestibular mucosa. •Tip back bend of 45 degrees is given distal to omega loop . •The wire should be cinched distal to the molar buccal tube •The buccal segment should be contoured to prevent tissue impingement. www.indiandentalacademy. com
- 15. APPLIANCE DESIGN hook to engage elastics omega loop tip back bend of 45 degrees www.indiandentalacademy. com
- 16. •Class II elastics ( preferably blue or green ) applying 100 – 150 gm force are used from the hook mesial to canine and to the lower molar hook. •The modular sectional arch blocks the segment between the canine and the upper first molar in one unit , which it moves in distal direction. www.indiandentalacademy. com
- 17. BIOMECHANICS • Based on cantilever mechanism Mechanics of spring elastics www.indiandentalacademy. com
- 18. •These mechanics can effectively tip back an upper molar and rotate the molar mesial out. •Distal end of omega loop acts as a stop and applies the tipping force on upper molar. www.indiandentalacademy. com
- 19. • A light class II elastic is placed from lower arch • Class –II elastic is effective , not only because of its distal force but because a very large moment is produced tipping the molar distally. www.indiandentalacademy. com
- 20. • Class – II elastics can flare the lower arch, increase the vertical and steepen the occlusal plane. • Hence elastics are used for a short period of time. • Because the molars tip back rapidly, only a short period of class – II elastic wear is required leading to negligible side effects www.indiandentalacademy. com
- 37. Modular appliance Fabr icatio n quite simpl e Less time consuming re with ’t interfe t Won treatmen other echanics m www.indiandentalacademy. com
- 38. •Distalisation is brought about in short duration of time…….. fixed into the auxiliary tube advantages versatile Unilateral or bilateral Class II www.indiandentalacademy. com
- 39. Conclusion If anchor loss is noticed early and timely intervention of modular appliance is made, it saves a lot of drudgery. www.indiandentalacademy. com
- 40. Acknowledgement Dr. E. MUNIRATNAM NAIDU, Principal, Dr. P. JAYA KUMAR, Vice principal, PROF&HEAD OF DEPARTMENT, ORTHODONTICS. STAFF MEMBERS & P.G. STUDENTS Department Of orthodontics MEENAKSHI AMMAL DENTAL www.indiandentalacademy. COLLEGE. com