Definitive Orthodontic Treatmen1

DEFINITIVE ORTHODONTIC TREATMENT

1) All are true about two-step procedure for retraction of canine and incisors in 0.022 appliance except: a) It is predictable technique. b) Has excellent fail safe characteristic. c) It is less frequently used. d) It takes longer to close the premolar extraction space.

2) The greatest disadvantage of segmental arch space closure technique is a) It's increased complexity. b) It may be not fail safe. c) It needs frequent monitoring and observation. d) It has no rigid connection between the anterior and posterior segment which make it dificault to maintain arch form and vertical relation.

3) In Begg`s technique, extraction space are closed by: a) Initially tipping the teeth together and then uprighting them. b) Bodily movement of canine and followed by retraction of incisors. c) Bodily enmass movement of canine and incisors together. d) Initially tipping the canine alone followed by uprighting of incisor and uprighting them.

4) A corrected anterior cross bite is best retained by: a) Over correction (1-2 mm). b) Normal incisor relation. c) Retention by removable appliance (mean by Hawley`s retainer and palatal Z springs). d) Fixed appliance.

5) Orthodontic correction of which of the following is most easily retained: a) Spacing. b) Rotation. c) Crowding. d) Anterior cross bite.

6) The tendency for skeletal problem to reoccur after orthodontic correction result from:

a) Continued growth in the pattern which causes the skeletal problem (open bite, deep bite, etc.) for the 1st place. b) In adequate correction due to failure of mechanotherapy. c) In adequate retention after orthodontic treatment. d) Non of the above.

7) `k` swallow is a treatment modality to treat: a) Mouth breathing. b) Tounge thrust. c) Open bite. d) Deep bite.

8) Headgear should not be prescribed in the fowling situation: a) When faical asymmetry is severe. b) Mandibular palne angle is high. c) There is no chance for cooperation by the patient in wearing it. d) Maxillary teeth need only slight resistant from forward movement.

9) Which of the fowlloing method is least accurate in determining the site of new bone deposition: a) Implants. b) Radiograph. c) Alizarin stain. d) Tetracycline stain.

10) Edgewise bondable brackets are used: a) On incisal edges of anterior teeth. b) To obtain edge toe edge occlusion. c) With rectangular arch wire. d) With labial arch wires at incisal and gingival edge of each brackets.