MCQs in Orthodontics - Myofunctional and Orthopedic appliances

# All of the following can be classified as myofunctional appliances EXCEPT:
A. Anterior bite plane
B. Andersen appliance
C. Begg appliance
D. Oral screen

# All the following are passive tooth-borne functional appliances except:
A. Andersen activator
B. Woodside and Hawley activator
C. Expansion activator
D. Herbst appliance

# Functional appliances in skeletal class II are indicated when:
A. Maxilla is normal, mandible is retrognathic
B. Maxilla is prognathic
C. Mandible is retrognathic in a mature individual
D. When severe crowding is present

# Which of the following is not an indication for a class II activator:
A. Mandibular retrusion
B. Horizontal/anterior type of mandibular growth
C. Crowding lower anteriors
D. Upright lower anteriors

# FRANKL-IV used for:
A. Class-I malocclusion
B. Class-II malocclusion
C. Class-III malocclusion
D. Bimaxillary protrusion

# Myofunctional appliance is given at which stage:
A. Primary dentition
B. Mixed dentition
C. Permanent dentition
D. Adulthood

# Denholtz appliance is used for:
A. Correction of open bite
B. Distalisation of the molars
C. Correction of deep bite
D. Correction of anterior cross bite

# In which of the following conditions oral screen should not be used:
A. Nail biting habit
B. Tongue thrusting
C. Acute infection of tonsils and adenoids
D. Thumb sucking

# Lip bumper not used in the treatment of:
A. Lip biting
B. Distalisation of molars
C. Nail biting
D. Lip exercises

# Oral screens are used for all of the following purposes except:
A. Mouth breathing
B. Tongue thrusting
C. Lip biting
D. Retraction of upper protruded teeth
E. None of the above

# The optimal time to employ an orthodontic appliance that takes advantage of growth is during:
A. Late mixed dentition
B. Early mixed dentition
C. Late primary dentition
D. Early permanent dentition

# Frankl appliance is a:
A. Myofunctional appliance
B. Removable appliance
C. Fixed appliance
D. None of the above

# Myofunctional appliances are:
A. Active removable appliances
B. Passive appliances delivering forces from surrounding oral and periodontal tissues
C. Semi-fixed appliances
D. Fixed appliances

# The only tissue-borne functional appliance is:
A. Activator
B. Bionator
C. Twin block
D. Frankel

# The angle of inclined plane in Clarke's twin block is:
A. 45°
B. 70°
C. 65°
D. 80°

# Jasper jumper is a:
A. Flexible fixed functional appliance
B. Rigid fixed functional appliance
C. Fixed functional appliance
D. None of the above

# Herbst appliance is commonly used to correct class II relations in:
A. Young patients
B. Patients aged above 20 years
C. In preadolescent patients between 12-18 years
D. None of the above

# Contraindications of activator include:
A. Crowding cases
B. Proclined incisors
C. Non-growing individuals
D. Vertical growers with high FMA angle
E. All of the above

# Headgear should not be prescribed in which of the following situations:
A. Facial asymmetry is severe
B. The mandibular plane angle is high
C. There is no chance that the headgear will be worn
D. Posterior movement of mandibular teeth is necessary

# Head gear causes:
A. Bucco lingual movement of maxillary molars
B. Mesio distal movement of maxillary molars
C. Intrusion of molars
D. All of the above

# Which of the following headgear is preferred while treating a class II div. 1 malocclusion with a horizontal growth trend?
A. High pull headgear
B. Medium pull headgear
C. Cervical headgear
D. Reverse pull headgear

# Distalisation of molars is accomplished with:
A. Cervical headgear
B. Occipital headgear
C. Chin cap
D. A & B

# Reverse headgear is used mainly:
A. To retract maxilla
B. To induce the growth of maxilla in skeletal retrusion
C. To inhibit growth of mandible in class-III malocclusion
D. To induce growth of mandible in class-III

# The indication for the use of Kloehn type cervical headgear is in:
A. Maxillary retrusion
B. Maxillary protrusion
C. Mandibular prognathism
D. Mandibular retrognathism

# Milwaukee brace is used:
A. To redirect the maxillary growth
B. Maxillary protrusion
C. To stop the maxillary growth
D. To stop the mandibular growth

# A headgear applied to the maxillary molars can serve to improve anteroposterior skeletal dysplasia by:
A. Downward and backward rotation of the maxilla
B. Posterior repositioning of the maxillary teeth within the maxilla
C. Rapid palatal expansion
D. Redirection of maxillary growth

# The major disadvantage of treatment using a cervical headgear is:
A. Impaction of maxillary canines
B. Extrusion of maxillary incisors
C. Extrusion of maxillary molars
D. Deformity of neck

# Surgery on the hard palate of a 3-year-old cleft palate patient may inhibit growth centers, causing the facial profile to become:
A. Elongated
B. More curved
C. Shortened
D. More concave

# Chin cap is used in which of the following cases?
A. To redirect mandibular growth in skeletal class III malocclusion with anterior open bite
B. To correct anterior cross bite of maxillary central incisors
C. Following serial extraction
D. To correct skeletal class II malocclusion

# Surgical orthodontic treatment is required in:
A. Maxillary teeth proclined
B. Abstraction
C. Skeletal Class III
D. None of the above

# The high pull headgear is used to:
A. Extrude the maxillary incisors and correct anterior deep bite
B. To intrude the maxillary incisors and correct anterior deep bite
C. To intrude the mandibular incisors and correct anterior deep bite
D. None of the above

# Maxillary protraction headgear is used for:
A. Maxillary skeletal protrusion
B. Mandibular skeletal retrusion
C. Bi maxillary protrusion
D. Skeletal open bite

# Chin cap is used in:
A. Class I
B. Class II
C. Skeletal class III
D. Dental class III

# The minimum force required to retard and redirect the maxillary growth:
A. 300 - 400 gm/side
B. 400 - 500 gm/side
C. 500 - 600 gm/side
D. 450 - 550 gm/side

# Delaire's Facemask is used in the treatment of:
A. Mandibular retrognathism
B. Maxillary retrognathism
C. Mandibular ankylosis
D. Maxillary prognathism

# Functional appliances:
A. Only move teeth
B. Can change the direction of growth
C. Are fabricated in the original mandibular position
D. Correct malocclusion rapidly

# Oral screen:
A. Causes the child to breathe through the nose
B. Allows for the passage of air through mouth
C. Prevents passage of air through nares
D. Allows the passage of air through mouth and nose

# NORWEGIAN APPLIANCE is:
A. Bionator
B. Activator
C. Frankel
D. Twin block

# The wax "working bite" prior to functional appliance construction is made primarily with the intention of:
A. Providing a record of occlusion
B. Registering desired mandible position
C. To relax the jaw muscles
D. All of the above

# For best result in class III malocclusion correction, the orthopedic appliance should be worn at least:
A. 12-16 hours per day
B. 8-10 hours per day
C. 5-8 hours per day
D. Throughout the night

# The labial bow in activator is constructed with:
A. 0.6mm
B. 0.5mm
C. 0.7mm
D. 0.8mm & slightly heavier

# Which of the following is a fixed functional appliance:
A. Bionator
B. Bow activator
C. Herbst appliance
D. A & B

# Appliance of choice in cases with anteroposterior maxillary deficiency is:
A. Cervical pull headgear
B. Reverse pull headgear
C. Occipital pull headgear
D. Parietal pull headgear

# Oral vestibular screens are mainly used in correction of:
A. Thumb sucking
B. Tongue thrusting
C. Mouth breathing
D. Lip biting

# Oral screens are used for all the following purposes EXCEPT:
A. Tongue thrusting
B. Mouth breathing
C. Lip biting
D. Retraction of upper protruded teeth

# Lip bumper is used for:
A. Mouth breathing
B. Nail biting
C. For lip biting & hyperactive mentalis
D. All of the above

# Infant orthopedics in a cleft patient is done at the age of:
A. 1 - 2 weeks
B. 3 - 6 weeks
C. 9 - 12 weeks
D. 12 - 15 weeks

# Ideal age for the use of Delaire face mask in the treatment of skeletal maxillary deficiency cases is in the:
A. 6 - 8 year old age group
B. 8 to 10 year old age group
C. 10 to 12 year old age group
D. 12 to 14 year old age group

# Myofunctional appliances are highly effective in Class II malocclusion with:
A. Prognathic maxilla and normal mandible
B. Prognathic maxilla and retrognathic mandible
C. Normal maxilla and Retrognathic mandible
D. Retrognathic maxilla and normal mandible

# A 10-year-old boy comes to the clinic presenting with a distal step molar relation in the mixed dentitional stage. He would most probably need which of the following appliances?
A. Nance holding arch
B. Oral screen
C. Functional regulator
D. Space maintainers

# Which of the following myofunctional appliances can be used in uncooperative patients with class II malocclusions?
A. Activator
B. Frankel II
C. Bionator
D. Herbst

# Which of the following is a myofunctional appliance?
A. Catalan's appliance
B. Hawley's appliance
C. Expansion screw
D. Derichsweiler appliance

# Major goals of growth modification always is:
A. To maximize skeletal changes and minimize dental changes
B. To maximize skeletal changes
C. To maximize dental changes
D. To maximize dental changes and minimize skeletal changes

# Bone can be induced to grow at surgically created sites by the method called:
A. Osteogenesis
B. Distraction osteogenesis
C. Bone wax
D. Green stick fracture

# Which of the following is considered a contraindication for functional appliance treatment?
A. Class II Div. 2 pattern
B. Mandibular retrognathism
C. Proclined lower incisors
D. Deep bite

# Mid palatal split following Le-Fort 1 osteotomy is done by moving the maxilla in which direction?
A. Superior
B. Inferior
C. Antero-posterior
D. Transverse

# Amount of pressure/Force exerted by Lip on maxillary Incisors?
A. 10-15 gm/cm²
B. 20-25 gm/cm²
C. 25-30 gm/cm²
D. 30-35 gm/cm²