Temporary Anchorage devices

1. Temporary Anchorage devices

2. • TAD is a device that is temporarily fixed to
bone for the purpose of enhancing
orthodontic anchorage either by supporting
the teeth of the reactive unit or by obviating
the need for the reactive unit altogether and
which is subsequently removed after use.

3. Ideal requirements
• Small
• Affordable
• Easy to place
• Resistant to orthodontic force
• Able to be immediately loaded
• Usable with familiar orthodontic mechanics
• Easy to remove.

4. Ideal requirements of implant material
• Non toxic
• Biocompatible
• Possess excellent mechanical properties
• Provide resistance to stess,strain and
corrosion
• Its effectiveness should be proven in clinical
and experimental studies

5. Parts of implant
• Implant head-Source of attachment of elastics
or coil springs
• Implant body-part embedded inside the bone
-Transgingival/transmucosal collar/neck-It
serves to provide a seal of mucosa around it
and thus prevents entry of microbes leading
to inflammation or infection.

7. Classification
• Based on location
• -Subperiosteal-In this design, the implant
body lies over the bony ridge.
• -It has decreased long term success rate
because of increases chances of dislodgement
and complex in their design.
• The subperiosteal design currently in use for
orthodontics is onplant

9. • Transosseous
• The implant body penetrates the mandible
completely
• Endosseous
• These are partially submerged and anchored
within bone.

12. • Osseous-These are placed in dense bone such
as zygoma,body,ramus and palatal area.

13. • Based on composition
• stainless steel
• Cobalt Chromium-Molybdenum
• Titanium
• Ceramic implants
• Vitreous carbon and composites

14. • Bioglass-these are partially or fully crystallized
glasses containing varying composition of
silicon,calcium,phosphorus and sodium.This
composition elicits a biological response of
bone and will form a stable biochemical bond
with cortical bone
• Ticonium

15. Implant driving methods
• Self-tapping method; In this method a tunnel
is first drilled in to the bone and the implant is
then tapped in.This method is used for smaller
diameter microimplants.
• Self drilling method; In this method the
implant itself drills into the bone.Used for
larger diameter implants.

16. • According to exposure of the head.
• Open method; The head of the microimplant
is exposed to the oral cavity.This method is
used when the implant is placed in an area
where the soft tissues are not moveable such
as attached gingiva.

17. • Closed method ; The head of the microimplant
is embedded under the soft tissue. This
method is used when the implant is placed in
an area where the soft tissue is moveable.

18. According to the path of insertion
• Diagonal or oblique insertion; The implant is
inserted in an oblique direction (30-60 degree
angulation) to the bony surface, both buccally
and lingually.This method can be used when
the interradicular space is very narrow.
• Perpendicular insertion.The implant is inserted
almost perpendicular to the bony surface.This
method can be used where there is enough
space between the roots.

19. Clinical applications
• Intrusion of incisors
• Correction of canted occlusal plane
• Molar intrusion
• Molar mesialization
• Molar distalization
• Closure of extraction space.