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Design of twinblock by clark

Design of twinblock by clark. 6 type of design. Type 1. Standard Twin Blocks-Class II Div I (with good arch form) • Adams or Delta Clasps, and Anterior Ball clasps for good retention •Twin Blocks, at a 70º angle, to advance mandible

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Design of twinblock by clark

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  1. Design of twinblock by clark 6 type of design

  2. Type 1

  3. Standard Twin Blocks-Class II Div I • (with good arch form) • Adams or Delta Clasps, and Anterior Ball clasps for good retention •Twin Blocks, at a 70º angle, to advance mandible • Upper Midline Screw: so upper arch can accommodate lower arch in advanced position

  4. Type 2

  5. Standard Twin Blocks-Class II Div I • (with crowded lower arch) • Adams or Delta Clasps, and Anterior Ball clasps for good retention •Twin Blocks, at a 70º angle, to advance mandible • Upper and lower Midline Screws

  6. Type 3

  7. Stage II - Support Phase • Anterior Inclined Plane used to maintain the corrected • AP and incisor relationship until buccal segments settle into full occlustion. • *Molars must be in contact to begin Stage II

  8. Type 4

  9. Class II Div II Twin Block • Adams or Delta Clasps •Twin Blocks, at a 70º angle, to advance mandible • Upper and lower Midline Screws • Lingual Springs to move anterior forward • To Open Bite: Reduce upper bite block as • ilustrated above

  10. Type 5

  11. Class II Div II Twin Block “SAGGITAL” • Adams or Delta Clasps, and Ball clasps • Standard 70º Twin Blocks • Adjust screws ¼ turn per week to advance anteriors • To Open Bite: Reduce upper bite block as • ilustrated above

  12. Type 6

  13. Twin Block to Close the Bite • Adams or Delta Clasps • Standard 70º Twin Blocks • Tongue guard to prevent tongue thrust and act as Inclined plane to support the corrected incisor relationship • Lower Acryclic extended to 6’s with indicated clasps • Acrylic relieved lingual to anteriors to encourage reduction of open bite

  14. refrences • Principles of Appliance Therapy Operatory Edition. • Clark, William. “Twin Block.” The American Journal of Orthodontics. January 1988.

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