Relapse after orthodontic treatment can be totally prevented by 1) Inactive fixed appliance 2) Hawley"s retainer worn for 1 year 3) Wearing activator for 3 months 4) None of the above, some degree of relapse is normal
OrthodonticsAnswer: 4
A substantial increase the maxillary width is usually best obtained by placing 1) Lingual arch wire 2) A sutural expansion fixed appliances 3) Posterior intermaxillary cross elastics 4) A face-bow with an expanded inner bow
OrthodonticsAnswer: 2
Rooting reflex disappears in normal infants by the age of 1) 4 months after birth 2) 7 months after birth 3) 9 months after birth 4) 12 months after birth
OrthodonticsAnswer: 2
Which of the following are typical and acceptable preventive and therapeutic measures for dealing wih these periodontal problems during fixed appliance therapy? 1) Elimination of gingivitis prior to placing orthodontic appliance 2) Megavitamin therapy 3) Scaling and curettage immediately after appliance removal 4) None of the above
OrthodonticsAnswer: 1
The appliance used to treat thumbsucking 1) Crib appliance 2) Frankel appliance 3) Bionator 4) Activator
OrthodonticsAnswer: 1
Which of the following are sites of cartilaginous growth postnatally? 1) Spheno-occipital synchondrosis 2) Mandibular condyle 3) Nasal septum 4) Both A and B
OrthodonticsAnswer: 4
Headgear applies forces in the range of 1) 200-400 g/side 2) 400-800 g/side 3) 200-400 g total 4) None of the above
OrthodonticsAnswer: 1
A child in primary dentition period had thumb sucking habit. There is slight anterior open bite. Immediate treatment is 1) Fixed palatal crib 2) Removable habit breaking appliance 3) Myofunctional therapy 4) Periodic observation until permanent incisors develop
