MCQs in Orthodontics

Chapter 1: The orthodontic problem

 

1- Column angle is seen in which malocclusion:

 

  1. class 2 division 1 malocclusion
  2. class  2 division 2 malocclusion
  3. bilateral posterior crossbite
  4. class 3 malocclusion

 

 

 

 

 

 

 

The answer is: B

 

2-Down patient shows:

 

  1. Midline retrusion
  2. Retruded mandible
  3. Protruded mandible
  4. None of the above

 

 

 

 

 

 

The answer is: A

 

3- Labial displacement of maxillary canine leading to crowding in the maxillary anterior segment due to lack of space is mainly caused by:

 

  1. The eruption of maxillary canine before that of the maxillary first premolar
  2. The eruption of maxillary lateral incisor before that of maxillary canine
  3. The eruption of maxillary canine before that of maxillary lateral incisors
  4. The eruption of maxillary first premolar before that of maxillary canine

 

 

 

 

 

 

The answer is: A

 

4-A patient is involved in chronic mouth breathing, the clinical examination of the patient reveals:

 

  1. convex profile, long face
  2. concave profile, long face
  3. convex profile, short face
  4. concave profile, short face

 

 

 

 

 

 

 

The answer is: A

 

5- Prenormal occlusion is:

 

  1. class 1 malocclusion
  2. class 2 malocclusion
  3. class 3 malocclusion
  4. bimaxillary protrusion

 

 

 

 

 

 

 

The answer is: C

 

6-Synostosis is:

 

  1. The fusion of two adjacent bone by cartilage
  2. Early closure of suture or early fusion of bone by bone
  3. The fusion of adjacent bone by fibrous cartilage
  4. None of the above

 

 

 

 

 

 

 

The answer is: B

 

 

7-Overbite is defined as a ................ overlap of the incisors.

 

  1. Horizontal
  2. Vertical
  3. Transverse
  4. Mesiodistal

 

 

 

 

 

 

 

The answer is: B

 

8-Which of the following is defined as IOTN grade 5:

 

  1. Increased overjet greater than 9 mm.
  2. Increased and complete overbite with gingival or palatal trauma.
  3. Anterior crossbite with greater than 2 mm discrepancy between CR and ICP.
  4. Presence of supernumerary teeth.

 

 

 

 

 

 

 

The answer is: D

 

 

9- X Occlusion is:

 

  1. buccal crossbite in australian arborigines
  2. seen in south pacific isllanders
  3. seen in oriental population
  4. seen in african population

 

 

 

 

 

 

 

The answer is: A

 

10- Who was first to comment on craniofacial deformity:

 

  1. celsus
  2. hippocrates
  3. fauchard
  4. angle

 

 

 

 

 

 

The answer is: B

 

11-In normal occlusion the teeth have:

 

  1. Marginal contact
  2. Edge to edge contacts
  3. Cusp to cusp contacts
  4. Surface contacts

 

 

 

 

 

 

 

 

The answer is: D

 

12-The incidence of cleft lip and palate is:

 

  1. 1 in 600
  2. 1in 700
  3. 1 in 800
  4. 1 in 900

 

 

 

 

 

 

 

The answer is: C

 

 

13- Natal teeth are defined as:

 

  1. Teeth present at the time of birth.
  2. Teeth erupting in the 2 nd -3rd  month.
  3. Teeth erupting between 6 months to 2 year.
  4. Teeth erupting after 1 year of age.
  5. Teeth erupting after 2 years of age.

 

 

 

 

 

 

 

The answer is: A

 

14-Class 3 malocclusion is seen in:

 

  1. Pierre robin sequence
  2. Treacher collin syndrome
  3. Goldenhar syndrome
  4. Down syndrome

 

 

 

 

 

 

 

 

The answer is: D

 

15-  Which of the following best describes the type of growth of the condyle at the condylar cartilage:

 

  1. Appositional growth
  2. Interstitial growth
  3. None of the above
  4. All of the above

 

 

 

 

 

 

 

The answer is: D

 

 

16- Where is the mental foramen present on a child with deciduous teeth:

 

  1. Beneath the mesiobuccal cusp of the 1st deciduous mandibular molar
  2. Beneath the 1st deciduous central mandibular incisor
  3. Above the 1st deciduous central maxillary incisor
  4. None of the above.

 

 

 

 

 

 

 

The answer is: A

 

17-  Sicher believed that cranio-facial growth occurs at sutures,  what is this theory called:

 

  1. Sutural Dominance theory
  2. cranio- facial theory
  3. Growth dominance theory
  4. Head and neck growth theory.

 

 

 

 

 

 

 

The answer is: A

 

18- The mandibular intercanine width is relatively complete by what age in girls and boys:

 

  1. Between 9-10years in boys and girls
  2. 10 for boys and 15 for girls.
  3. 5years for both girls and boys.
  4. At birth.

 

 

 

 

 

 

The answer is: A

 

19- Which of the following statements about the thymus is correct:

 

  1. The thymus size increases with age
  2. The thymus size decreases with age
  3. The thymus size stays the same size
  4. the thymus size change varies person to person.

 

 

 

 

 

 

The answer is: B

 

20- Which of the following malocclusion typically has lingually inclined upper central incisors that are overlapped by labially tipped upper lateral incisors:

 

  1. Class 3
  2. class 1
  3. class 2 div 1
  4. Class 2 div 2

 

 

 

 

 

 

The answer is: D

 

21- A common feature of a class 2 div 2 malocclusion is:

 

  1. Anterior deep bite
  2. Open bite
  3. Anterior cross bite
  4. none of the above

 

 

 

 

 

The answer is: A

 

22-  A patient with an anterior cross bite with class 3 molars attends your practice, when you retrude the patients mandible and make the patient close in centric relation, the molars are in a class 1 relation.  This feature is known as which of the following malocclusions:

 

  1. Pseudo class 3 malocclusion
  2. True class 3 malocclusion
  3. A Class 3 and class 2 malocclusion.
  4. True class 1 malocclusion

 

 

 

 

 

 

The answer is: A

 

23- ‘Transversion’ is a term used to describe:

 

  1. Class 3 skeletal with class 1 molars
  2. Transposition of 2 teeth.
  3. Staining on teeth.
  4. none of the above

 

 

 

 

 

The answer is: B

 

24- From the following, which is the most common reason for malocclusion:

 

  1. Early loss of primary teeth
  2. Supernumery teeth
  3. Ankylosed teeth
  4. Missing teeth

 

 

 

 

 

The answer is: A

 

25- What is the most common pathological reason for children to prematurely lose their deciduous teeth:

 

  1. Exfoliation
  2. Gingivitis
  3. Caries
  4. none of the above

 

 

 

 

 

 

The answer is: C

 

26- Cleft lip and/or cleft palate patients have a number of associated dental problems, which of the following is an associated feature:

 

  1. Supernumerary teeth
  2. Absence of teeth
  3. macroglossia
  4. A and B only.

 

 

 

 

 

 

 

The answer is: D

 

27- What is the most commonly seen congenital defect from the following:

 

  1. Macrognathia
  2. Parkinsons disease
  3. Cleft lip and palate
  4. Oligodontia

 

 

 

 

 

 

The answer is: C

 

 

28- Late eruption of the permanent dentition can be due to:

 

  1. Supernumerary teeth
  2. Hypothyroidism
  3. Congenitally absent permanent teeth
  4. All of the above

 

 

 

 

 

 

 

The answer is: D

 

29- Some endocrinal conditions can affect the development of teeth, which statement is correct regarding hypothyroidism:

 

  1. Delayed loss of primary dentition
  2. Early loss of primary dentition
  3. Over-activity of the thyroid gland
  4. None of the above.

 

 

 

 

 

The answer is: A

 

30- An 8-year-old child has proclined maxillary anterior teeth due to tongue thrusting, which of the following should be advised:

 

  1. Refer for fixed orthodontic treatment
  2. No advice should be given as the malaligned teeth will correct themselves
  3. Extract the procline teeth
  4. Advice to stop the tongue-thrusting habit as soon as possible.

 

 

 

 

 

The answer is: D

 

31- Which of the following can be causing mouth breathing:

 

  1. Deviated Nasal Septum
  2. Habit
  3. Nasal polyps
  4. All of the above

 

 

 

 

 

 

 

The answer is: D

 

32- Mouth breathing can cause which of the following:

 

  1. Caries
  2. Periodontal disease
  3. Long, narrow face
  4. All of the above

 

 

 

 

 

 

The answer is: D

 

33- A way to test mouth breathing is:

 

  1. mirror test
  2. Water test
  3. Cotton test
  4. All of the above.

 

 

 

 

 

 

The answer is: D

 

34-The most common cause of a class 3 malocclusion is:

 

  1. Hereditary
  2. Occlusal prematurities
  3. Cleft palate
  4. Caries

 

 

 

 

 

 

The answer is: A

 

35- The ANB angle in a patient of class 3 malocclusion is usually:

 

  1. More than 4 degrees
  2. Between 2 to 4 degrees
  3. Negative or less than 2 degrees
  4. Positive and more than 2 degrees.

 

 

 

 

 

 

The answer is: C

 

36- A class 3 skeletal mal relationship is associated with:

 

  1. Retrognathic maxilla only
  2. Prognathic mandible only
  3. Both A and B
  4. All of the above

 

 

 

 

 

 

The answer is: D

 

37- The speech difficulties associated with a class 3 malocclusion are:

 

  1. Labiodental Fricatvie-F and V
  2. S and Z (Sibilants)
  3. T and D linguaalveolar stops
  4. Th, Sh, Ch (Linguo- dental Frication)

 

 

 

 

 

 

The answer is: A

 

38- Most class 3 malocclusions are associated with:

 

  1. Skeletal Class 3 pattern
  2. Open bite
  3. Deep bite
  4. Competent bite

 

 

 

 

 

 

The answer is: A