MCQ orthodontic Mey phoung 5

What’s function of labial bow ( Active ) when apply the force to anterior teeth
To procline anterior teeth
To retract anterior teeth
To intrude the anterior teeth
To keep in position of anterior teeth
Unrelated
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 unrelated
What cephalometric planes tracing were found ?
Frankfort plane
Maxillary plane
Functional occlusal plan
Mandibular plane
All are related
The normative values of SNA angle for the A-P Jaw relationship of the Chinese Norm:
SNA: 83±1
SNA: 83±2
SNA: 83±3
SNA: 83±4
All unrelated
The normative values of SNB angle for the A-P Jaw relationship of the Chinese Norm:
SNB: 80±3
σ� SNB: 82±3
SNB: 83±3
SNB: 84±3
All unrelated
The normative values of ANB angle for the A-P Jaw relationship of the Chinese Norm:
ANB: 3±1
ANB: 3±2
ANB: 3±3
ANB: 3±4
All unrelated
The normative values of SNA angle for the A-P Jaw relationship of the Caucasian Norm:
SNA: 81±1
SNA: 81±2
SNA: 81±3
SNA: 81±4
All unrelated
The normative values of SNB angle for the A-P Jaw relationship o
SNB: 78±1
SNB: 78±2
SNB: 78±3
SNB: 78±4
All unrelated
The normative values of ANB angle for the A-P Jaw relationship of the Caucasion Norm: ?
ANB: 3±1
ANB: 3±2
ANB: 3±3
ANB: 3±4
All unrelate
The most frequently used of cephalometric in orthodontic ?
Postero-Anterior view
σ� Lateral view
Lateral oblique
All are related
Unrelated
The skeletal discrepancy of Class II malocclusion when
The maxilla normal and mandibular retrusive
The maxilla protrusive and mandibar retrusive
The maxilla protrusive and mandible normal
All are related
All unrelated
The skeletal discrepancy of Class III malocclusion when ?
The maxilla retrosive and mandibular protrusive
The maxilla normal and mandibular protrusive
The maxilla retrosive and mandibular normal
σ� All are related
Unrelated
The skeletal Class I was described when ?
ANB : 2-3 degree
ANB: 2-4 degrees
ANB: 2-5 degrees
ANB: 2-6 degrees
Unrelated
The skeletal Class II was described when ?
ANB : ˃ 1 degrees
ANB : ˃ 2 degrees
ANB : ˃ 3 degrees
ANB : ˃ 4 degrees
All unrelated
The skeletal Class III was described when ?
ANB : ˂ 1 degrees
ANB : ˂ 2 degrees
ANB : ˂ 3 degrees
ANB : ˂ 4 degrees
All unrelated
Dental analysis, how can upper central incisor compares to ?
SN Line
Maxillary plane
Lower central incisor
All are related
All unrelated
Dental analysis, how can lower central incisor compares to ?
Facial plane
Occlusal plane
Mandibular plane
σ� Franfort plane
All unrelated
In cephalometric analysis of children with malocclusion, the angle ANB is frequently used. In patients with severe Class II malocclusion, this angle is ?
Greater than the Norm
Less than the Norm
σ� Normal
Unrelate
Ometimes greater, sometimes less
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
Retroclination of maxillary central incisors
Unrelated
Anterior teeth are most likely to be fractured in children with which of the following mixed dentition malocclusions?
σ� Class
Class II div 1
Class II div 2
Class III
There is no relation
The best time to correct a upper central incisor crossbite is ?
After permanent canines erupt
σ� After permanent central incisors erupt
After permanent lateral incisors erupt
During erupting stage of central incisors erupt
Un related
The inter-incisal angle was constructed by axis of
Upper incisor to maxillary plane
Upper incisor to mandibular plane
Lower incisor to maxillary plane
Lower incisor to mandibular plane
Upper incisor to Lower inciso
Lower anterior facial height ratio ( % ) was calculated by ?
LAFH + TAFH x 100%
LAFH/TAFH x100%
UAFH + TAFH x 100%
UAFH/TAFH x 100%
All unrelated
The line joining the tip of the nose to the chin was called a Ricketts E- Line or Aesthetic Line in Normative value for the Caucasion Norm is ?
Value = 2 ± 2 mm
Value = 2 ± 1 mm
Value = 2 ± 0 mm
Value = 0 ± 1 mm
Value = 1 ± 1 mm
The Functional was defined as Removable or fixed appliance that ?
Stretching the muscles
Posture the mandible move forward
Force was transmitted to the dentition
σ� Force was transmitted to the skeletal structure
All are related
The most important action of a functional appliance was ?
The condyles in the glenoid fossa
Holding the mandible forwards
Holding the mandible backwards
Holding the mandible upwards
All are related
The patient in deep bite case who wear functional appliance the bite plane was used as ?
Posterior bite plane
Posterior capping
Anterior bite plane
Lower incisor capping
Lower incisor inclined bite plane
What’s happened when the functional appliance was finished ?
Discrepancy of the skeletal structure
σ� facial convexity
Condylar heads were ankylosis
Gap in the buccal segments
Lower incisor are retroclined
The component that can be used to help upper arch expansion during functional appliance related to the soft tissue change ?
Labial bow
Frankels
Shields
Springs
Wax bite
Space analysis requires a comparison between the amount of space available for the alignment of teeth and the amount of space required to align them properly, the method of space analysis when ?
Permanent first premolars have erupted
Permanent second premolars have erupted
Permanent first molars have erupted
Permanent second molars have erupted
Permanent third molars have erupted
The space analysis of Tanaka and Johnston prediction value based on in mixed dentition when ?
Lateral incisors have erupted
Central incisors have erupted
σ� Permanent first molars have erupted
All are related
Unrelated
The factor that 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
The soft tissue effect when functional appliance was finished ?
σ� Lower lip incompetence
Lower lip competence
Lower lip seal when swallowing
Lower lip cover full crown of the upper incisors
All are related
What’s ideal patient was Indicated for functional appliance
Average FMPA
Low FMPA
FMPA : 20-30 deg
All are related
σ� Unrelated
What method that can effect for the overbite reduction when patient wear removable appliance?
Molar capping
Posterior bite plane
Anterior bite plane
σ� Head gear
All are related
For patient compliance, patient should wear functional appliance regularly at least ?
10 hours/day
12 hours/day
14 hours/day
24 hours/day
All are correct
A 12 years old boy with upper and lower teeth alignment in both arches who has class II incisor relationship associated with skeletal II base, what’s appliance should be indicated for this patient ?
Removable appliance
Functional appliance
Fixed appliance
Head gear
All are related
Which option can be related to the Andrew six keys ?
Molar relationship class II
Spacing
Rotation
Inclination abnormal
All unrelated
The most important of incline bite plane when the functional appliance was finished ?
Keep for aesthetic
Keep mandible in position
Keep mandible move forward
Keep mandible move backward
Keep the gap at the buccal segment
The most common cause of median diastema in the ugly duckling stage with patient who has ?
4 to 5 year of age
5 to 6 year of age
6 to 7 year of age
8 to 9 year of age
All are related
The patient who has to need for fixed retainers after post- treatment of orthodontic when?
Teeth are spacing
Teeth are Periodontology
σ� Teeth are rotation
All are related
Unrelated
What is the right answer for teeth movement in fixed appliance ?
Rotation
Tipping movement
Bodily movement
Extrusion
All unrelated
What is the optimum force ( g ) for root uprighting ?
50g – 100g
50g – 120
50g – 130g
50g – 140g
All unrelated
( overjet= 11 mm ) and the teeth in both arches are well aligned combined with skeletal II base by the normal maxilla when the mandible in retrusive, how can manage this patient ?
Fixed applianc
Removable appliance
Functional appliance
Facemask
All are related
Treatment of early loss of deciduous teeth, space maintainer can be used if ?
The E is present
The E has large restoration
The E is lost prematurely
The E has just roots
All unrelated
Upper and lower arches were checked in intra-oral examination ?
Inclination of incisors
Crowding teeth
Gingival recession
Cross bite, rotation, missing, impacted….
All are related
The angulation of upper and lower permanent canines means that when the canines ?
Mesially inclined
Distally inclined
Upright
σ� All are related
Unrelated
What are the components for functional appliance ?
Working bite
Bite-planes
Shields
Extra-components
All are related
The component to change the soft tissue balance in functional appliance is ?
Bite-planes
Working bite
Spring
Shield
Scre
The function of the upper inclined bite plane is ?
To maintain space
To allow eruption the lower posterior teeth
To expand upper arch transversel
All are related
All unrelated
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