• Save
Intelligent archwire 3 /certified fixed orthodontic courses by Indian dental academy
Upcoming SlideShare
Loading in...5
×
 

Like this? Share it with your network

Share

Intelligent archwire 3 /certified fixed orthodontic courses by Indian dental academy

on

  • 140 views

...


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

Statistics

Views

Total Views
140
Views on SlideShare
140
Embed Views
0

Actions

Likes
0
Downloads
2
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Intelligent archwire 3 /certified fixed orthodontic courses by Indian dental academy Presentation Transcript

  • 1. www.indiandentalacademy.com
  • 2. ACKNOWLEDGEMENT INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 3. Introduction Orthodontic therapy is a force management procedure, largely based on the use of wires. Wires are a mainstay in storing and distributing the therapeutic force to the teeth thus bringing them to the ideal function and esthetic position. www.indiandentalacademy.com
  • 4. •Ideally, archwires are designed to move teeth with light continuous forces. •It is important that the forces do not decrease rapidly. •Light forces reduce patient discomfort, tissue hyalinization and undermining resorption. www.indiandentalacademy.com
  • 5. LOOPED VS NiTi • Tissue injury • Unhygienic environment • Fabrication complexity • Time consuming www.indiandentalacademy.com
  • 6. Evolution of NI-TI alloys Buehler’s preliminary results led to the development of the first Ni-Ti orthodontic alloy by pioneers such as ANDREASEN and his colleagues. The engineering of nickel- titanium alloys has made remarkable progress since the original work of BUEHLER for the Naval Ordinance Laboratory in the early 1960’s. www.indiandentalacademy.com
  • 7. • Chinese Ni-Ti – the General Research Institute for Non-ferrous Metals –(1978) • Japanese Ni-Ti – the Furukawa Electric Company Ltd – Japan (1978) • Copper Ni-Ti – Rohit Sachdeva (1995) These advanced alloys have different transition temperatures and present a phase transformation. Further research led to the advent of Superelastic and Thermodynamic Ni-Ti alloys. www.indiandentalacademy.com
  • 8. Wire characteristics and clinical relevance. • Large spring back • Low stiffness • High Formability • High Stored Energy • Biocompatibility • Environmental Stability www.indiandentalacademy.com
  • 9. Atomic structure of Ni-Ti The crystallographic,tri-dimensional lattice of the Ni-Ti alloy is present in 2 phases: Martensite phase:the lattice is body-centered (cubic or tetragonal) Austenitic phase: the lattice is face - centered (hexagonal close packed) An intermediate rhombohedral ‘R’phase with a simple hexagonal lattice has also been identified.www.indiandentalacademy.com
  • 10. • Ni-Ti alloys has a specific temperature range in which the phase transition takes place from the austenite to the martensitic phase(reversible change) and this TTR contributes to the shape memory effect of Ni-Ti alloys. www.indiandentalacademy.com
  • 11. SHAPE MEMORY is a phenomenon whereby the alloy is soft and readily formable at a low temp.,but can easily be returned to its original configuration when heated to a suitable TTR. www.indiandentalacademy.com
  • 12. …An interesting feature of shape memory • Through deflection and repeated temp. cycles, the wire in the austenitic phase is able to “memorize”a preformed shape. • By lowering the temp.,the alloy is transformed into martensite and becomes pliable and easily deformed. • However, every time the temp. rises above austenitic phase,the wire will remember and recover the ideal arch-form.www.indiandentalacademy.com
  • 13. Superelasticity Superelasticity is a phenomenon wherein the stress remained nearly constant despite the strain change within a specific range. • This allows a constant force to be delivered over an extended portion of the deactivation range,and is therefore more likely to generate physiologic tooth movement and greater patient comfort. www.indiandentalacademy.com
  • 14. Pseudoelasticity –stress-related behavior of Ni-Ti • The deflection in an austenitic archwire at oral temp. generates a local martensitic transformation and produce stress induced martensite-SIM. • SIM is unstable and undergoes reverse transformation as soon as stress is removed. • In clinical application SIM forms where the wire is tied to brackets on misaligned teeth so that the wire becomes pliable ,with seemingly permanent deformation. www.indiandentalacademy.com
  • 15. Cu Ni-Ti…Advancing towards ideal archwire • Cu Ni-Ti alloy wire represents a major advancement in shape memory wires by reducing hysteresis and by providing precise transformation temperature at four different levels.www.indiandentalacademy.com
  • 16. Role of Copper :- • Cu enhances the thermal reactive properties of Ni-Ti alloys thus providing equal loading (engaging) and unloading (tooth driving) forces. • Cu gives precise control of the transformation temperature. • Cu produces lubricants to the system and decreases friction.www.indiandentalacademy.com
  • 17. Configuration of available Superelastic Ni-Ti and Heat-activated Ni-Ti Round Ni-Ti Rectangular & Square Ni-Ti www.indiandentalacademy.com
  • 18. After Before www.indiandentalacademy.com
  • 19. After Before www.indiandentalacademy.com
  • 20. www.indiandentalacademy.com
  • 21. www.indiandentalacademy.com
  • 22. Recycling of Ni-Ti Recycling involves • Repeated exposure of the wire for several weeks or months to mechanical stresses and elements of the oral environment • Sterilization between uses www.indiandentalacademy.com
  • 23. • Heat sterilization is the most reliable method - (Steam autoclaving at 1210 C,15-20psi for 20 min) • Chemical sterilization are corrosive &attack metals immersed in them (2% acidic Glutaraldehyde) www.indiandentalacademy.com
  • 24. Advantages of Ni-Ti Fewer archwire changes Less chair side time Reduction in time required to accomplish rotations and leveling Less patient discomfort www.indiandentalacademy.com
  • 25. Limitations to use of Ni-Ti Poor formability Fractures readily when bent over sharp edge and effects springback property Bending loops and stops in Ni-Ti is therefore not recommended.(cinch- backs can be obtained by flame – annealing the end of wire) www.indiandentalacademy.com
  • 26. …and to conclude In contemporary practice no one archwire material meets all ideal requirements and the best results are obtained by using specific archwire material for specific purposeswww.indiandentalacademy.com
  • 27. www.indiandentalacademy.com Thank you For more details please visit www.indiandentalacademy.com