MCQs in Orthodontics

Chapter 3: Diagnosis and Treatment planning

 

1- Serial extraction is contraindicated in all of the following EXCEPT:

 

  1. open bite
  2. spaced dentition
  3. flaring of teeth
  4. anodontia

 

 

 

 

The answer is: C

 

2- Whip spring is used for correction of:

 

  1. Rotation
  2. Proclination
  3. Crossbite
  4. Open bite

 

 

 

 

 

The answer is: A

 

3-Normal facial index is:

 

  1. 65-75%
  2. 75-80%
  3. 80-90%
  4. 100%

 

 

 

 

The answer is: C

 

4- M spring is used for:

 

  1. closure of midline diastema
  2. for treatment of open bite
  3. for treatment of posterior cross bite
  4. for occlusal settting

 

 

 

 

 

The answer is: A

 

5- Cetlin appliance is used for:

 

  1. Molar distilization'
  2. anterior cross bite
  3. posterior cross bite
  4. for midline diastema

 

 

 

 

 

The answer is: A

 

6- Orthodontic tooth movement in pulpless teeth compared to vital teeth is:

 

  1. Same for all teeth          
  2. More in maxillary teeth
  3. Less in maxillary teeth
  4. Depends on number of roots of the tooth

 

 

 

 

 

The answer is: A

 

7- Amount of magnification possible with panoramic radiograph is:

 

  1. 20-25%
  2. 10-15%
  3. 5-10%
  4. 15-30%

 

 

 

 

 

The answer is: C

 

8-ANB angle is used to assess:

 

  1. Sagittal jaw discrepancy.
  2. Vertical jaw discdrepancy.
  3. Soft tissue profile.
  4. Dental pattern.

 

 

 

 

The answer is: A

 

9-Which is not a essential diagnostic aid in orthodontics:

 

  1. Study models
  2. OPG
  3. Photographs
  4. Hand wrist radiographs

 

 

 

 

 

The answer is: D

 

10- A blanch test is used to test which of the following:

 

  1. Abnormal frenal attachment
  2. The size of an overjet
  3. Saliva quantity
  4. Saliva quality

 

 

 

 

 

The answer is: A

 

11- A Bitewing Radiograph can detect all of the following pathologies, EXCEPT:

 

  1. Height and contour of alveolar bone
  2. Interproximal caries
  3. Pit and fissure caries
  4. Secondary caries

 

 

 

 

The answer is: C

 

12- Orthodontic study models are an important diagnostic aid, the maxillary and mandibular cast bases are:

 

  1. 100 degree angle to each other
  2. Perpendiclar to each other
  3. Parallel to each other
  4. None of the above

 

 

 

 

 

 

The answer is: C

 

13- which of these tests are the least useful in concluding the site of new bone deposition in laboratory animals:

 

  1. Histochemical stains
  2. Tetracycline stains
  3. Implants
  4. Radiographs

 

 

 

 

 

The answer is:D

 

14- A patient with orthodontic appliances takes aspirin, this can cause orthodontic movement to:

 

  1. slow done
  2. be faster than normal
  3. be unaffected
  4. cannot be predicted

 

 

 

 

 

The answer is: A

 

15- A patient with class 2 div malocclusion is likely to have which of the following:

 

  1. Orthognathic profile
  2. Straight profile
  3. Convex profile
  4. Concave profile

 

 

 

 

 

The answer is: C

 

16- Ideally, when the teeth are in normal occlusion the mandibular skeletal base compared to the maxillary skeletal base is:

 

  1. 5-7mm posterior
  2. 2-3mm posterior
  3. 2-3mm anterior
  4. 5-6mm anterior

 

 

 

 

 

 

The answer is: B

 

17- An ANB angle of 8degrees, indicates:

 

  1. Class 1 malocclusion
  2. Class 2
  3. A and B
  4. Class 3

 

 

 

 

 

The answer is: B

 

 

18- Dental age can be determined by:

 

  1. Assessing the stage of root development and calcification
  2. MRI scan
  3. Periapical radiograph
  4. None of the above

 

 

 

 

 

The answer is: A

 

19- The extraction of teeth is usually advised when there is:

 

  1. Arch length – tooth material discrepency
  2. Abnormal sagittal inter-arch relationship
  3. Abnormally large size and form of teeth
  4. All of the above

 

 

 

 

 

The answer is: D

 

20- The most commonly extracted teeth as a part of orthodontic treatment are:

 

  1. Deciduous teeth
  2. Premolars
  3. Canines
  4. Incisors

 

 

 

 

 

The answer is: B

 

21- The drawbacks of extracting lower incisors include:

 

  1. Narrowing of lower inter-canine width
  2. Retroclination of lower incisors
  3. Deep bite
  4. All of the above

 

 

 

 

 

The answer is: D

 

22-Extracting premolars can create space to orthodontically correct the:

 

  1. Anterior region
  2. Posterior region
  3. Both of the above
  4. None of the above

 

 

 

 

 

The answer is: C

 

23- Wilkinson extraction  refers to:

 

  1. Extraction of four first permanent molars between ages 8.5 and 9.5 years.
  2. Extraction of four deciduous molars between 6 and 7 years
  3. Extraction of four deciduous canines before puberty
  4. None of the above

 

 

 

 

 

The answer is: A

 

24- In a patient with a class 3, if the maxillary primary canines exfoliate early, then to avoid worsening of the pre-normalcy, the dentist should:

 

  1. Extract lower deciduous canines.
  2. Extract lower deciduous central incisors.
  3. Extract lower deciduous lateral incisors.
  4. Extract lower first molars.

 

 

 

 

 

The answer is: A

 

25- Extraction of first permanent molars should be avoided because:

 

  1. It does not give adequate space in the anterior region
  2. It can result in deepening of the bite
  3. The second premolar and the second molar may tip into the extraction space
  4. All of the above

 

 

 

 

 

The answer is: D

 

26- The extraction of second permanent molars is advocated in all of the following, EXCEPT:

 

  1. To prevent impaction of third molars
  2. To allow distilization of first molars
  3. In open bite cases
  4. In deep bite cases

 

 

 

 

The answer is: D

 

27- Balancing extractions means:

 

  1. Removal of another corresponding tooth on the opposite side of the same arch to prevent the midline shift to the side of the extraction space.
  2. Extraction of teeth in the opposite jaw to preserve the buccal occlusal relationship.
  3. Removal of a tooth on the opposite side of the opposite jaw.
  4. None of the above.

 

 

 

 

 

The answer is: A

 

28- A patient presents with mild anterior crowding, open bite, and multiple carious teeth with first molars grossly decayed and unrestorable, the above condition can be preferable treated with:

 

  1. First premolars
  2. Second premolars
  3. First molars
  4. Second molars

 

 

 

 

 

The answer is: C

 

29- If An arch length-tooth material discrepancy is about 7mm the tooth most preferred for extraction is:

 

  1. first premolar
  2. second premolar
  3. First molar
  4. Second molar

 

 

 

 

The answer is: A

 

30- Which of the characteristics below does not represent a class 2 div 2 malocclusion:

  1. Retroclined central incisors
  2. Deep overbite
  3. Forward path of occlusion
  4. Molars in disto-occlusion

 

 

 

 

The answer is: C

 

31-  The facial profile of a patient with malocclusion of a class 2 div 2 is usually:

  1. Convex
  2. Concave
  3. More or less straight
  4. It is difficult to predict as each patient is different.

 

 

 

 

 

The answer is: C

 

32- In a class 3 malocclusion the mesio-buccal cusp of the upper first molar occludes with:

  1. The mesio-buccal groove of the lower first permenant molar
  2. The disto-buccal groove of lower first permenant molar
  3. In between the mandibular first and second permanent molars
  4. With the mesio-buccal groove of lower second permenant molar.

 

 

 

 

 

The answer is: C

 

33- The facial profile of a patient with a class 3 malocclusion is typically:

 

  1. Concave
  2. Convex
  3. Straight
  4. Severely convex

 

 

 

 

 

The answer is: A

 

34- A class 3 maloclussion is most complicated by:

  1. Presence of a forward path of closure
  2. Presence of anterior cross bite
  3. presence of skeletal malrelationship
  4. presence of normal incisor relationship

 

 

 

 

 

The answer is: C

 

35- A patient with a class 3 malocclusion has a normal maxilla but a prognathic mandible, which of the following should be used to help correct this:

  1. Activator
  2. Face mask
  3. Chin cap with high pull head gear
  4. Reverse head gear

 

 

 

 

 

The answer is: C