MCQ orthodontic Mey phoung4
What treatment options when permanent lateral incisors are missing ?
Create space for implants
Preserve space with bridges
Preserve space with partial denture
Closing space and shape 3 to look like 2
All are related
Premature loss of deciduous teeth, when the C and D in unilateral loss cause ?
σ� Midline shift to the side of extraction
The first permanent molars drift distally
The E’s drift backwards
All are related
All unrelated
Premature loss of deciduous teeth, when the C and D in bilateral loss cause ?
The first permanent molars and the E’s to drift forwards
The first permanent molars and the E’s are rotated
The first permanent molars and the E’s are tilting
All are related
All unrelated
Premature loss of deciduous teeth, when the E is extracted before 6 erupts
The 6 will erupts more towards the mesial entering the premolar areas
Loss of space in the arch for the premolar erupts
Midline shift to the extraction side
σ� All are related
All unrelated
Premature loss of deciduous teeth, when the E is extracted after 6 has erupted ?
The 6 will tilt mesially
The 6 will extrude
The 6 will drift backwards
Space will be created
All unrelated
The early loss of deciduous teeth would cause ?
Loss of space will be faster
Loss of space will be more severe
Crowding in the buccal segment
All are related
All unrelated
Treatment of early loss of deciduous teeth, balancing extraction is needed if ?
The C or D is decay
The C or D is missing unilaterally
The C or D has crown fracture
The C or D has restoration
All unrelated
Treatment of early loss of deciduous teeth, space maintainer is 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
Examination and Diagnosis in family and social history related to
Hereditary factor
Do they understandwhat orthodontic treatment involves
How far they live
Can they come regurlary
All are related
Usually reduced face height is associated with ?
Normal bite
Deep bite
Open bite
Cross bite
All unrelated
Excessive lower face height may be the cause of ?
Anterior open bite
Anterior deep bite
Anterior cross bite
Anterior over the bite
All unrelated
The inclination of mandibular plane to the true horizontal or Franfort plane should be note ?
A steep mandibular plane angle correlates with long anterior face height
Anterior open bite malocclusion
A flat mandibular plane angle correlates with short anterior face height
σ� Deep bite malocclusion
All are related
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 Chinese Norm is
Value = 2 ± 2 mm
Value = 2 ± 1 mm
Value = 2 ± 0 mm
Value = 0 ± 1 mm
Value = 1 ± 1 mm
The ideally of the lip line at rest position the lower lip cover between?
� or ½ of the labial surface of the upper central inciso
¾ of the labial surface of the upper central incisor
� of the labial surface of the upper central incisor
� of the labial surface of the upper central incisor
All unrelated
Check the soft tissue in clinical examination in extra-oral of the lip was found ?
Competent or incompetent lip
Lip line
Lip posture
Habitual position of lip
All are related
Clinical examination of intra-oral in the labial segment was checked and found
Incisor relationship
Overbite, Overjet
Centre line
Any displacement on closure
All are related
What we can see the overbite after intra-oral examination ?
Reduced or deep bite
Anterior open bite
Complete or incomplete
Trauma or non trauma
All are related
The amount of anchorage required depend on the factor below?
The number of teeth to be move
The distance of teeth need to be move
Force applied
Root surface areas (RSA) of the teeth used for anchorage
All are related
Which one the following types of anchorage for orthodontic treatment
Intra-maxillary
Inter-maxillary
Extra-oral anchorage
All are related
All unrelated
How to minimize anchorage loss for the tooth movement ?
Use force as light as possible
Move minimum number of teeth at one time
Ncrease the resistance of anchor teeth
All are related
All unrelated
The factors determining of the anchorage value ?
Force magnitude
Pressure distribution in the periodontal ligament
Root morphology
Space availabl
All are related
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 Orbital
Basion and Orbital
The FMPA Angle was recognized and constructed by ?
Frankfort to maxillary plane
Frankfort to mandibular plane
Frankfort to horizontal plane
Frankfort to occlusal plane
Frankfort to SN plane
The Molar relationship class II was known as the mesio-buccal cusp of the upper first permanent molar occlude to the lower first permanent molar at ?
The mesio-buccal groove
The distal-buccal groove
The distal of mesio-buccal groove
The mesial of mesio-buccal groove
Unrelated
In determining a patient's skeletal growth pattern, the most important factor is ?
Diet
σ� Habits
Heredity
Dental occlusion
Unrelated
The last primary tooth to be replaced by a permanent tooth is usually the ?
Maxillary canine
Mandibular canin
Maxillary first molar
Maxillary second molar
Mandibular second molar
The factors that causes of overjet increase ?
Skeletal factor
Dental factor
Soft tissues
Habits
All are related
A child at 5-6 years with molar class II, later stage the first molar become class I. The causes of the leeway space in ?
The upper arch is greater
The lower arch is smaller
The upper arch is normal
σ� The lower arch is greater
Unrelated
The malocclusion cause by thumb sucking
Procline of upper incisors
Retrocline of lower incisors
Anterior open bite
Constricted the maxilla
All are related
Screw expansion should be turned for a week ?
¼ turn = 0.15mm
¼ turn = 0.20mm
¼ turn = 0.25mm
¼ turn = 0.30mm
Unrelated
The buccal canine retractors are used when The canines are buccally erupted in ?
Mesially inclined
Distally inclined
Upright
Palatal position
All are related
The mandibular plane is constructed by joining which of the following landmarks ?
Gonion to Pogonion
Gonion to B Point
Gonion to Menton
Pogonion to Menton
Porion to Menton
The Normative values for A-P Jaw relationship in SNA angle for the Chinese Norm is ?
SNA : 80 ± 3
SNA : 81 ± 3
SNA : 82 ± 3
SNA : 83 ± 3
SNA : 84 ± 3
The measurement in dental analysis of inclination of the upper central incisors to
Maxillary plane
Cranial base or SN Line
Lower central incisors
All are related
Unrelated
The high risk of upper central incisor trauma when ?
Overjet = 9mm
σ� Overjet > 9mm
Overjet < 9mm
Sometime great, sometime less
Unrelated
The function of Z spring to apply the force to move the tooth ?
To mesially
To disally
To palatally
To labially
All are related
. The tooth moves in the dental arch in mesially or distally as ?
Palatal finger spring
Screw expansion
Clasp spring
All are related
Unrelated
The most common cause of the teeth missing ?
Central incisors
Lateral incisors
First premolars
First permanent molar
Second permanent molars
The conjunction of the fronto-nasal suture ?
Fronta
Sella
Nasion2
Nasal
Basion
The space analysis of Tanaka and Johnston prediction value based on in mixed dentition when the
Lateral incisors have erupted
Central incisors have erupted
σ� Permanent first molar have erupted
All are related
Unrelated
What method that can effect to the overbite reduction when patient wear removable appliance ?
Molar capping
Posterior bite plane
Anterior bite plan
Head gear
All are related
On 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
The action lower block of the functional appliance (Class II twin block )tendency to
To upright lower incisors
σ� To retrocline lower incisors
To procline lower incisors
All are related
Unrelated
The definition of incisor relationship class II , the lower incisors edges occlude
To the cingulum plateau of the upper incisors
Posteriorly of the cingulum plateau of the upper incisors
Anteriorly of the cingulum plateau of the upper incisor
σ� Edge to edge to the upper central incisor
σ� Unrelated
The management of the median diastema when the patient has a problem with the teeth missing of upper lateral incisors ?
Closing space
Create space
Keep the space for partial denture
Keep the space for implant
All are related
A patient who has class II division 1 malocclusion and the upper incisors are proclined with increase overjet 6 mm , upper and lower arches are well alignment. How many space requirement for overjet reduction ?
6mm
7mm
8mm
9mm
10mm
A child at 5-6 years with molar class II, later stage the first molar become class I. The causes of the skeletal growth ?
Maxilla growth is longer than the mandible
σ� Mandible growth is longer than the maxilla
Maxilla and mandible growth at the same duration
Mandible growth sometimes longer, sometimes shorter
Skeletal growth change by functional appliance
The most frequently used of radiographic in orthodontic ?
Postero-anterior view
Lateral oblique view
Maxillary anterior occlusal view
Lateral view
All are related
The points in the maxillary landmark have known as ?
Orbital
Gonion
Basion
Porion
σ� Unrelated
The type of retentive component is Z spring/ double helical spring, what’s function when apply the force to anterior teeth ?
To move premolar or canine buccally
To move teeth in the dental arch mesially or distally
To procline one or a group of anterior teeth
To upright premolar or canine in the arc
All are related
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