INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacademy.com
Treatment with the Tweed-Merrifield Edgewise Appliance.
Based on Tweed’s diagnostic philosophy
Merrifield has developed th...
Sequential appliance placement:
•In the first premolar extraction case the;
•1st molars are left unbanded, the 2nd molars ...
Advantages:
•Longer interbracket distance in the posterior segment of
archwire, this ensures rapid second molar movement
•...
Sequential tooth movement:
•Unlike the method of en masse tooth movement used by
Tweed; tooth movement is sequential
•Teet...
Merrifield:
•Utilized sequential mandibular anchorage preparation.
•Only two teeth were tipped at a time.
•Accomplished by...
Directional force including the control of the vertical dimension
to enhance mandibular response:
•During the course of
tr...
Such a force system
requires that the
mandibular incisors be
upright over basal bone so
the maxillary incisors can
be move...
For the counterclockwise force
system to be a reality,vertical
control is critical. To control
the vertical dimension, one...
Sequelae of downward and backward force system:
If Point B drops down and
back, the face becomes
lengthened, the mandibula...
Timing
Timing of treatment is an integral part of the treatment
philosophy.
Treatment should be initiated when predetermin...
Thank you
For more details please visit
www.indiandentalacademy.com

www.indiandentalacademy.com
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Tweed merr /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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Tweed merr /certified fixed orthodontic courses by Indian dental academy

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Treatment with the Tweed-Merrifield Edgewise Appliance. Based on Tweed’s diagnostic philosophy Merrifield has developed the force systems. There are five concepts composing the treatment philosophy: •Sequential appliance placement •Sequential tooth movement •Sequential mandibular anchorage preparation •Directional force including the control of the vertical dimension to enhance mandibular response •Proper timing of treatment. www.indiandentalacademy.com
  3. 3. Sequential appliance placement: •In the first premolar extraction case the; •1st molars are left unbanded, the 2nd molars and 2nd premolars are banded. •The central incisors, lateral incisors, canines are bonded. In cases of malaligned are not bonded initially. After these teeth respond to the forces the 1st molars are banded; maxillary first molars are banded after one appointment, mandibular first molars banded after second appointment. www.indiandentalacademy.com
  4. 4. Advantages: •Longer interbracket distance in the posterior segment of archwire, this ensures rapid second molar movement •Wires of larger dimensions that are less subject to occlusal or bracket engagement distortion can be used. •Allows much greater efficiency in action of archwire. •Less traumatic to the patient. •Easier and less time consuming for the Orthodontist. www.indiandentalacademy.com
  5. 5. Sequential tooth movement: •Unlike the method of en masse tooth movement used by Tweed; tooth movement is sequential •Teeth are moved rapidly and with precision because they are moved individually. Sequential mandibular anchorage preparation: Tweed method; •Used the en masse anchorage by giving all compensation bends in the archwire at the same time. •This force system caused the mandibular incisors to flare labially and intrude. www.indiandentalacademy.com
  6. 6. Merrifield: •Utilized sequential mandibular anchorage preparation. •Only two teeth were tipped at a time. •Accomplished by using ten teeth as anchorage unit to tip two teeth at a time. This is referred as “Merrifield 10-2 system”. Steps: •Second molars are tipped to its desired anchorage prepared position. After space is closed a compensating bend is placed mesial to maintain its tip •First molars are tipped to an anchorage prepared position.Similar compensation bend is placed mesially to maintain its tip. •Second premolar is tipped distally to its anchorage prepared position www.indiandentalacademy.com
  7. 7. Directional force including the control of the vertical dimension to enhance mandibular response: •During the course of treatment it is crucial to maintain control over mandibular anterior and posterior teeth and the maxillary anteriors. •The resultant vector of all orthodontic forces should be counterclockwise so that the opportunity for a favorable skeletal change is enhanced www.indiandentalacademy.com
  8. 8. Such a force system requires that the mandibular incisors be upright over basal bone so the maxillary incisors can be moved distally and superiorly. www.indiandentalacademy.com
  9. 9. For the counterclockwise force system to be a reality,vertical control is critical. To control the vertical dimension, one must control the mandibular plane, the occlusal plane, and the palatal plane www.indiandentalacademy.com
  10. 10. Sequelae of downward and backward force system: If Point B drops down and back, the face becomes lengthened, the mandibular incisor is tipped forward off basal bone, and the maxillary incisor drops down and back instead of being moved up and back www.indiandentalacademy.com
  11. 11. Timing Timing of treatment is an integral part of the treatment philosophy. Treatment should be initiated when predetermined objectives can be most readily accomplished. Interceptive treatment in the mixed dentition, Selected extractions in the mixed dentition, or Waiting for second molar eruption before initiating active treatment. www.indiandentalacademy.com
  12. 12. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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