MCQ orthodontic mey phoung2
What function for Z spring ?
To move one or a group of anterior teeth to palatally
To move one or a group of anterior teeth to buccally
σ� To move one or a group of anterior teeth to mesially
To procline one or a group of anterior teeth
All unrelated
What function for T spring ?
To move premolar buccally
To move canine buccally
To procline an upper incisor
All are related
All unrelated
What function for Buccal canine retractor ?
To move a buccally erupted canine palatally and buccally
To move a buccally erupted canine palatally and mesially
To move a buccally erupted canine palatally and distally
O move a buccally erupted canine palatally and labially
All unrelated
What function for labial bow ?
To protract upper incisors
To retract upper incisors
To procline upper incisors
All are related
All unrelated
Which active component that can retract upper incisors ?
Labial bow with simple U loop
Labial bow with reverse U loop
Robert’s retractor
All are related
σ� All unrelated
What are active components for removable appliance ?
Active components
Retentive component
Achorage components
Base plate
All are related
Types of active components ?
Springs and Screws
Screws and southend clasp
Ball clasps and springs
Adams clasps and elastic
All unrelate
What functions of the screws expansion ?
To move one or a group of teeth labially
Expand upper arch transversely
To move one or a group of teeth distally
All are related
All unrelated
Disadvantage of expansion screw ?
Bulky
More expansive compare with spring
Difficult to manage before and after completion
All are related
All unrelated
What function of the retentive components ?
To move the teeth labially
To keep the appliance in position
To move the teeth distally
σ� All are related
σ� All are related
The various types of retentive components ?
Adams clasp and southend clasp
Adams clasp and clasp spring
Adams clasp and buccal canine retractor
Adams clasp and palatal spring
All unrelated
Anchorage is the resistance to reactive forces generated by ?
Active components of the appliance
Retentive components of the appliance
The contact between the baseplate and the palate
Placements of clasps or bows on teeth
All unrelated
How to preserve the anchorage for removable appliance ?
Contact the baseplate with other teeth not being moved
Placements of clasps or bows on teeth which are not being moved
Contact of the baseplate with the vertical part of the palate in the areas
All are related
All unrelated
What is the optimum force for tipping movement ( profit-2000 ) ?
15 - 60 (g)
25 - 60 (g)
35 – 60 (g)
45 – 60 (g)
All unrelated
What is the optimum force for bodily movement ( profit-2000 ) ?
50 - 100 (g)
60 – 100 (g)
60 – 120 (g)
70 – 120 (g)
All unrelated
What function of the baseplate for removable appliance ?
Prevent unwanted drift of the teeth
Supports the wire and screw
Contributes the anchorage
Protect palatal spring
All are related
How can design and planed the teeth movement for removable appliance
Planed which tooth/ teeth that need to be move
Planed the number of appliances that are needed
Select the wires are suitable for the appliance
All are related
All unrelated
What is the optimum force for root uprighting ( profit-2000 ) ?
10 - 20 (g)
35 – 60 (g)
50 – 100 (g)
70 – 120 (g)
All unrelated
What is the optimum force for intrusion ( profit-2000 ) ?
5 – 10 (g)
10 – 20 (g)
20 - 30 (g)
30 – 40 (g)
All unrelated
The optimum force ( 35g – 60g ) to apply for teeth movement ( profit-2000 ) ?
Tipping
Extrusion
Rotation
All are related
All unrelated
Delayed for extraction of deciduous teeth may lead to ?
Malocclusion
Crowding
Impacted permanent teeth
Permanent teeth are not in the arch
All are related
Early extraction of the all second deciduous molars may lead to ?
Upper and lower midline shift
Upper 1st permanent molar tendency mesially movement
σ� All 1st permanent molars tendency mesially movement
Upper and lower midline coincidence
All unrelated
Why the removable appliance was used in mixed with fixed appliance?
Upper or lower can not treated with fixed appliance
May need to reinforce of anchorage
May loose the brases in the upper or lower ach
Easy to improve oral hygiene in the mouth
All are related
When need to extract the 1st permanent molars with poor prognosis before orthodontic treatment?
1st molars were pain
When 2nd molars erupting with bifurcation
When the 3rd molars were absent
When carie develop to the dentine
All unrelated
Early lost of the 1st permanent molars may lead to ?
Bone resorption
Second premolars tipping distally
Extrude the upper or lower permanent molars in antagonist
Spacing in the arch
All are related
The components for removable appliance ?
Active components
Retentive components
Anchorage
Base plate
ARAB
The active components in removable appliance ?
Adams clasp
Clasp spring
Clasp
Ball clasp
All unrelated
The retentive component of the URA ?
Clasp spring
Ball clasp
T spring
Z spring
All unrelated
What the anchorage for removable appliance ?
Base plate
Springs
Screws expansion
Mini implants
All are related
What are the following active components in removable appliance that effect to correct distally inclined canine ?
Buccal canine retractor
Robert retractor
Distal movement by headgear
Class I traction
All unrelated
How can to calculate the space for teeth alignment when the arch and teeth tendency to crowding ?
Use divider
Ruler
Tanaka and John stone technique
σ� All are related
Unrelated
. Upper incisor inclination 140 degree mean that ?
Normal inclination
Retroclined
Proclined
Uprighting
Unrelated
Class I incisor relationship mean that ?
Lower incisor proclined
Lower incisor retroclined
σ� Lower incisor normal
All are related
Unrelated
Class II division 1 incisor relationship mean that ?
Lower incisor norma
Lower incisor proclined
Lower incisor retroclined
All are related
Unrelated
. Class III incisor relationship mean that ?
Upper incisor retroclined
Upper incisor proclined
Upper incisor uprighting
σ� All are related
Unrelated
How can to expose canine when it’s impacted?
Close exposed
Open exposed
Gold chain
All are related
Unrelated
Canine impacted when the position in?
σ� Palatally
Buccally
In the arch
All are related
Unrelated
Gold chain are usually used when the ?
Permanent canine impacted
Permanent incisor impacted
Permanent premolar impacted
All are related
Unrelated
Transposition of the teeth when ?
Permanent lateral in canine position
Permanent canine in lateral position
Permanent premolar in canine position
σ� Permanent canine in premolar position
All are related
Total arch length minus total teeth width when the result is a negative value, it’s indicates ?
The presence of spacing
The presence of crowding
The presence of alignment
The severe of malocclusion
All unrelated
Total arch length minus total teeth width when the result is a positive value, it’s indicates ?
The presence of crowding
The presence of spacing
The presence of alignment
The severe of malocclusion
All unrelated
The based on Tanaka and John stone method was indicated when in ?
Permanent teeth are presence
Late mixed dentition
Early mixed dentition
σ� Mixed dentition
All unrelated
Every millimeter of incisor overjet reduction requires the space in the dental arch ?
1 mm
2 mm
3 mm
4 mm
All unrelated
Every millimeter of incisor overjet increase, the space are created in the dental arch ?
1 mm
σ� 2 mm
3 mm
4 mm
All unrelated
How can creating space for teeth alignment ?
Extraction
Distal movement of molars
Enamel stripping
Expansion
All are related
Before planning extractions of any permanent teeth, it’s important to ensure that ?
All remaining teeth are present
Developing are appropriately
May need radiograph
All are related
All unrelated
What factors that effect to the choice of the teeth for extraction ?
Position
Prognosis
Amount of space required
Anchorage requirements
All are related
Which teeth are often to choice to be extracted when space requirement is moderate or severe ?
First permanent premolars
Second permanent premolars
First permanent molars
Second permanent molars
All unrelated
The a mount of crowding is classified as ?
Mild crowding
Moderate crowding
Severe crowding
σ� All are related
All unrelated
Modules were used in fixed appliances in order to hold ?
Brackets
Wires
Bands
All are related
All unrelated
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