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Pg retraction spring /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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  • 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 2. PG Retraction Spring • Poul Gjessing- 1985 • Controlled tipping- uprightingover long periods of activation • Net result- bodily movement • Preformed-0.016 x 0.022 SS • Double ovoid apical helix- 10mm • Smaller occlusally placed helixwww.indiandentalacademy.com activation further closes the loops
  • 3. o Segment of circle in distal leg- eliminate undesirable moments acting on 2nd premolar www.indiandentalacademy.com
  • 4. PG Retraction Spring • For canine retraction- 160gms • Double helix separated by 1mm • Resist tipping & rotational tendencies -not correct rotation or extreme inclination • Leveling of buccal segment –must • Activation- every 4 wks • Each activation- 1.5mm of controlled movement www.indiandentalacademy.com
  • 5. PG Retraction Spring • Controlled incisor retraction • Auxiliary molar tube- lateral incisor bracket • Twist anterior leg 90˚ - 3mm in front of vertical helix- fit in vertical tube of lateral bracket • Intrusive force- 12-25gms each side • Estimated treatment time- 5-6 months on an avg www.indiandentalacademy.com
  • 6. • Used for retraction of both canine and incisors • Incisor segment intrusion- 20-25gms/side • Mesial and distal extensions angulated to build in residual moments • Vertical forces in the posterior segment counteracted by forces of occlusion www.indiandentalacademy.com
  • 7. Opus loop • Described by Raymond E. Siatkowski • M/F for translation – Individual teeth: 7.1-10.2 mm – Groups of teeth: 8.0-9.1 mm • Most closing loops M/F 4-5 mm • To achieve net translation, add residual moment www.indiandentalacademy.com – Gable bends anterior & posterior
  • 8. Opus loop Disadvantage of gable bend • Tipping- translation- uprighting • Correct magnitude of residual moments are difficult to achieve • Changing areas of stress distribution in the pdl may not yield most rapid, least traumatic method of space closure www.indiandentalacademy.com
  • 9. Opus loop • Study: design and verify loop design capable of delivering M/F inherently without adding residual moments. • Castigliano’s Theorem: to derive of M/F ratio in terms of loop geometry. www.indiandentalacademy.com
  • 10. Standard Opus 70 loop M/F ratio on both the ends is equal www.indiandentalacademy.com
  • 11. www.indiandentalacademy.com
  • 12. www.indiandentalacademy.com
  • 13. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com