MDS PREP
When a permanent tooth emerges clinically how much of root structure is most likely to have developed
1. 1/3
2. 2/3
3. 100 %
4. No reaction at all
Orthodontics
Answer: 2
The first tissue to react when orthodontic forces are applied is
1) PDL
2) Cementum
3) Dentin
4) Alveolar bone
Orthodontics
Answer: 1
Normal facial index is
1) 65-75 %
2) 75-80 %
3) 80-90 %
4) 100 %
Orthodontics
Answer: 3
Placing the beaks into the furcation of primary second molar during extraction in 6-year-old child is contraindicated because
1) Proximity of succedaneous tooth buds
2) Of possibility of fracture of crowns
3) Of possibility of fracture of facial plates
4) Of possibility of fracture of lingual plates
Orthodontics
Answer: 1
Registration point
1) Point "A"
2) A point half way on the perpendicular from side sella to Bolton"s plane
3) Nasion
4) Point B
Orthodontics
Answer: 2
According to Tweed"s philosophy, the correct placement of which teeth is necessary to minimize relapse
1) Lower incisors
2) Upper incisors
3) Upper first molar
4) Lower first molar
Orthodontics
Answer: 1
Malocclusion can be caused by both environmental and hereditary factors. Which of the following is environmental?
- crowding
- dental agenesis
- posterior crossbite
- thumb sucking
When is the best time for an individual to receive orthodontic treatment?
- in the primary dentition
- in the mixed dentition
- in the permanent dentition
- whenever the situation calls for it