MDS PREP
A boy aged 14 years attends with a class I malocclusion. Moderate crowding in upper and lower anterior segment, primary upper canines retained. Radiographs show erupting permanent upper canines. Treatment is
1) Wait until upper primary canines shed naturally
2) Extract upper primary canines only and wait until permanent canine erupt
3) Extract upper "C" & "4"s & lower "4"s & maintain space for eruption of upper permanent canines
4) None of the above
Orthodontics
Answer: 3
Which of the following does not lie on the mandible
1) Pogonion
2) Porion
3) Menton
4) Gnathion
Orthodontics
Answer: 2
Orthodontic correction is indicated in pre-school age child for the following except
1) Anterior crossbite
2) Narrow upper arch
3) Abnormal oral habits
4) Class II malocclusion
Orthodontics
Answer: 4
It is no longer possible to apply the principles of interceptive orthodontics with the eruption of which tooth
1) Permanent first molar
2) Permanent second molar
3) Permanent canine
4) Permanent incisors
Orthodontics
Answer: 2
Main aetiology of class III malocclusions
1) Hereditary
2) Abnormal muscle forces
3) Delayed eruption of permanent teeth
4) Abnormal frenal attachments
Orthodontics
Answer: 1
The first tissue to react when orthodontic forces are applied is
1) PDL
2) Cementum
3) Dentin
4) Alveolar bone
Orthodontics
Answer: 1
Which line is used to represent the anterior cranial base?
- Frankfort Horizontal
- Gonion-Pogonion
- Nasion-Pogonion
- Sella-Nasion