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Kristýna dandová

Removable orthodontic appliances. Kristýna dandová. Removable orthodontic appliances. Used for correction of different orthodontic defects Defects of bite - open bite - crossbite - under bite

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Kristýna dandová

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  1. Removable orthodontic appliances Kristýna dandová

  2. Removable orthodontic appliances Usedforcorrectionofdifferentorthodonticdefects • Defectsof bite - open bite - crossbite - under bite • Defectsofindividualteeth - rotation - protrusion, retrusion -crowding

  3. Removabe orthodontic appliances are composed of acrylic body and clasps • The clasps are twisted of wire by special pliers (bird beak, cutter)

  4. The double helical spring • Made of 0.5 mm wire • Double helical spring is maximizing the elasticity of the protrusion spring

  5. The double helical spring ( Z-spring) is usualy used on rotated incisors • The spring is located on the tooth neck • The right sided and left sided z springsare fabricated accordingly

  6. The Adams clasp • 0,7 mm stainless steel wire • Adams clasp is used as anchorage of the appliance • Usualy situated on molars

  7. Twisting of Adams clasp 1st step

  8. 2nd step

  9. 3rd step

  10. The Adams clasps on theupper jaw

  11. The Adams clasps on thelower jaw

  12. No contact with palate

  13. The ball clasps • 0,7 mm wire • Used as anchorage of the removable appliances • Situated on incisors orin between premolars

  14. Theballclasp on theupper jaw

  15. No contact with palate

  16. Theballclasp on thelower jaw

  17. The labial bow • Made of 0,7 mm wire • Used for harmonic alignment of the anterior segment

  18. Thelabialbowissituatediscomposedofthreeparts: • Horizontalbowportion • „U“ loops • Retentivearms Thebowissituatedbetweenthecanines

  19. Thelabialbow on theupper jaw

  20. Thelabialbow on thelower jaw

  21. Example of another modification of the labial bow

  22. The upper jaw with all retentive clasps

  23. The lower jaw with all retentive clasps

  24. All clasps are fixed on models by wax

  25. Before the application of acrylic models have to be put into the water isolation

  26. Application of acrylic • After choosing of the color we can start with application of acrylic • We change application of powder and liquid untill we have appropriate shape of the appliance

  27. Orange liquid Red liquid Acrylic powder

  28. The poymerization proceeds in the polymerization unit (10 min,55°C, 3-3,5 bar)

  29. Polymerized applicances are machined by milling frases.

  30. Instrumentstoproduce an orthodonticappliance Separating disc rubber

  31. Machined appliance before polyshing

  32. Polyshing

  33. The upper jaw

  34. The lower jaw

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