Year4DD/Orthodontic I/Prof.Mey Phoung/
Orthodontic Knowledge Quiz
Test your knowledge of orthodontics with our comprehensive quiz designed for Year 4 Dental students! This interactive quiz covers a wide range of topics, from cephalometric landmarks to treatment approaches in orthodontics.
Compete for a high score while enhancing your understanding. Topics include:
- Cephalometric Analysis
- Orthodontic Treatment Techniques
- Malocclusion Classifications
- Facial Skeletal Structures
1. The conjunction of the fronto-nasal suture ?
Frontal
Sella
Nasion
Nasal
Basion
2. What type of extra- oral traction when combined with fixed appliance treatment ?
Headgear
Mini- implant
Inter- traction
Intra- traction
All are related
3. High pull headgear was indicated in case of lower anterior facial height ?
Decrease
Increase
Normal
MMPA < 27 ± 3 deg
Unrelated
4. Function of active component to apply force to the teeth in order to move teeth known as ?
Springs
Screws
Labial bow ( active )
Elastics
All are related
5. Frankfort Horizontal is a reference plane constructed by joining which of the following landmarks?
Nasion and Sella
Porion and Sella
Porion and Nasion
Porion and Orbitale
Basion and Orbitale
6. The best time to correct a maxillary central incisor crossbite is ?
After permanent canines erupt
After permanent central incisors erupt
After permanent lateral incisors erupt
During erupting stage of central incisors erupt
Unrelated
7. Which of the following conditions is usually present in a Class II, Division 2 malocclusion?
Open bite
Steep mandibular plane
Mesiocclusion of permanent first molars
Lingual inclination of maxillary central incisors
Unrelated
8. The type of movement usually produced by a removable appliance is ?
Torque
Tipping
Rotation
Bodily movement
Un related
9. Anterior teeth are most likely to be fractured in children with which of the following mixed dentition malocclusions?
Class I
Class II Division 1
Class II DIvision 2
Class III
There is no relation
10. What factors that effect to relapse overbite correction after orthodontic treatment ?
No enough overbite
No occlusal stop
Growth of the mandible
All are related
Unrelated
11. The use of lateral Cephalometric radiograph in diagnosis for focusing on the skeletal pattern in dimension view ?
Antero-posterior
Transverse
In-out
All are related
Unrelated
12. What diagnosis will be found when the lateral cephalometric tracing was finished ?
Skeletal pattern
Dental base length
Soft tissue
Dental factors
All are related
13. The anterior point of the fronto-nasal suture is ?
A Point
B Point
S Point
N Point
All unrelated
14. The deepest point on the concavity of the mandibular profile between the point of chin and the alveolar crest is ?
A Point
B Point
N Point
S Point
All unrelated
15. The deepest point on the maxillary profile between anterior nasal spine and the alveolar crest is ?
A Point
B Point
Ba Point
S Point
All unrelated
16. The most posterior, inferior point on the angle of the mandible ?
B Point
Po Point
Ba Point
Go Point
All unrelated
17. The lowermost point on the mandibular symphysis ?
B Point
Me Point
Po Point
Pog Point
All unrelated
18. The maxillary plane ( Mx ) was represented by a line drawn through from ?
ANS and PNS
ANS and Po
PNS and Or
PNS and Go
All unrelated
19. The Mandibular plane ( Mn ) was represented by a line drawn through from ?
Me and Pog
Me and Po
Me and Ba
Me and Go
All unrelated
20. The most inferior point on the marginal of the orbit ?
A Point
B Point
Or Point
Po Point
All unrelated
21. The highest point on the bony external auditory meatus ?
Or Point
Po Point
Ba Point
S Point
All unrelated
22. The Franfort plane ( FP ) was represented by a line connecting from ?
Po and ANS
Po and Nasion
Po and Pog
Po and Or
Unrelated
23. The most anterior point of the bony chin ?
Me Point
B Point
Pog Point
Ii Point
All unrelated
24. Functional occlusal plane ( FOP ) was represented by a line that passes through the occlusion of the ?
Mesial cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors
Mesial cusps of the permanent molar and halfway between the tips of the upper and lower central incisors.
Distal cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors.
Distal cusps of the permanent molar and halfway between the tips of the upper and lower central incisors.
All unrelated
25. The upper anterior facial height is a line that is perpendicular to ?
The Maxillary plane from the S Point
The Maxillary plane from the N Point
The Maxillary plane from the frontal bone
The Maxillary plane from the nasal bone
All unrelated
26. The lower anterior facial height is a line that is perpendicular to ?
The Maxillary plane from the B Point
The Maxillary plane from the Pog Point
The Maxillary plane from the chin
The Maxillary plane from the Me Point
All unrelated
27. The location of the Basion ( Ba Point ) was known as ?
The most inferior point of the Porion
In the middle point of the sella turcica
Nearest the zygomatic bone
The most superior of the condylar head
All unrelate
28. In the cranial base & cranium landmark there are the main five points as below: ?
Sella, Nasion, Porion, ANS and PNS
Sella, Nasion, Porion, Pogonion and Orbitale
Sella, Nasion, Porion, Basion and Orbitale
Sella, Nasion, Porion, Basion and Menton
Unrelated
29. The mandibular landmark were known as below: ?
Pogonion, Menton, Porion, Point B, Ii
Pogonion, Nasion, Gonion, Point B, Ii
Pogonion, Menton, Gonion, Point B, Ii
Pogonion, Basion, Gonion, Point B, Ii
All unrelated
30. The factor effect to the choice for teeth extraction when the space is required as follows ?
Teeth are poor prognosis
Teeth are well alignment with spacing
Anchorage requirements is enough
Teeth are well alignment without spacing
All are related
31. Definition of class I incisor relationship that lower incisor edge occlude to ?
Directly to cingulum ptateau of the upper incisor
Posteriorly of cingulum ptateau of the upper incisor.
Anteriorly of cingulum ptateau of the upper incisor.
Unrelated.
All are related.
32. The trauma to the tooth when the heavy force to supply ?
Crown fracture
Root fracture
Root resorption
Tooth lost
All are related
33. The convexity of the face with profile view when the ?
Skeletal is class III base
Skeletal is class II base
Skeletal is class I base
Skeletal discrepancy
Unrelated
34. The concavity of the face with profile view when the ?
Skeletal is class III base
Skeletal is class II base
Skeletal is class I base
Skeletal discrepancy
Unrelated
35. The premature contact when the teeth bite by ?
Posteriorly
Maximum inter-cuspation
Anteriorly
The edge to edge
Unrelated
36. Case selection for removable appliance when skeletal pattern as below ?
2˚≤ ANB ≤4˚
4˚˂ ANB ˂6˚
0˚≤ ANB ≤1˚
All are related
All unrelated
37. Tooth movement for removable appliance need ?
Tipping movement
Bodily movement
Uprighting movement
All are related
All unrelated
38. Which degree of rotation in tooth movement when the URA is indicated ?
The tooth that has 45º rotation
The tooth that has less than 45º rotation
The tooth that has more than 45º rotation
All are related
All unrelated
39. Which teeth apexes are suitable for removable appliance ?
The teeth apexes are displaced
The apexes are not diplaced
The apexes are resorbed
All are related
All unrelated
40. Which case for removable appliance should be indicated when ?
Posterior crossbite without mandibular displacement
Posterior crossbite with mandibular displacement
Bilateral buccal crossbite
All are related
All unrelated
41. Contra- indication for removable appliance when ?
Teeth need bodily movement
Very deep overbite
Severe imbalance skeletal pattern
All are related
All unrelated
42. The components for removable appliances ?
Active components
Retentive components
Anchorage
Baseplate
All are related
43. What is the function for active components ?
To prevent the teeth move in any places
To apply force to the teeth in order to move teeth
To keep in position all the teeth
All are related
All unrelated
44. Types of active components ?
Adams clasp
Southend clasp
Clasp
Springs
All are related
45. What types of springs for removable appliances ?
Z spring
Buccal canine retractor
T spring
All are related
All unrelated
46. Which size of wire for palatal finger spring ?
0.5 mm
0.7 mm
0.9 mm
1.0 mm
All unrelated
47. Which size of wire for buccal canine retractor ?
0.6 mm
0.7 mm
0.8 mm
0.9 mm
All unrelated
48. Which size of wire for Z spring ?
0.5 mm
0.7 mm
0.9 mm
All are related
All unrelated
49. Which size of wire for T spring ?
0.9 mm
0.7 mm
0.5 mm
0.3 mm
All unrelated
50. What function for palatal finger spring ?
To move a tooth to buccally
To move a tooth to palatally
To move a tooth to mesially or distally
To move a tooth to buccally or palatally
All unrelated
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