MCQs in Orthodontics

Chapter 2: The Development of Orthodontic problems

 

1- Cartilage differ from bone in that it grows by:

 

  1. appositional growth pattern
  2. interstitial growth pattern
  3. growth of cells in lacunae
  4. None of the above

 

 

 

 

 

 

The answer is: B

 

2-Compared to a permanent tooth abscess a a primary tooth abcess is more diffuse because:

 

  1. surrounding bone is less dense
  2. Roots of primary tooth are farther apart
  3. pain is less, therefore abcess is not detected early
  4. young patients are less resistant to infection

 

 

 

 

 

 

The answer is: A

 

3- Maxilla has how many ossification centre:

 

  1. 3
  2. 2
  3. 1
  4. 4

 

 

 

 

 

 

 

The answer is: A

 

4- The articular angle is large if mandible is:

 

  1. retrognathic
  2. prognathic
  3. none of the above
  4. any of above

 

 

 

 

 

 

The answer is: A

 

5- Development of palate occurs at:

 

  1. 5th week IUL
  2. 8th week IUL
  3. 9th week IUL
  4. 11 week IUL

 

 

 

 

 

 

The answer is: C

 

6- Sunday bite is defined as:

 

  1. Habitual forward posturing of mandible to Class I. 
  2. Posturing of mandible to Class III due to a premature contact.
  3. Posturing the mandible laterally to establish maximum cuspation  in bilaterally narrow maxilla cases.
  4. Posturing the mandible back to Class II, when actually in Class I.
  5. Under closure of jaw.

 

 

 

 

 

 

The answer is: A

 

7-Bite of accommodation means:

 

  1. Habitual forward posturing of mandible to Class I. 
  2. Posturing of mandible to Class III due to a premature contact.
  3. Posturing the mandible laterally to establish maximum cuspation in bilaterally narrow maxilla cases.
  4. Posturing the mandible back to Class II, when actually in Class I.
  5. Underclosure of mouth.

 

 

 

 

 

The answer is: C

 

8- If the frankfort plane and mandibular plane meet beyond the occipital plane then patient is

 

  1. horizontal grower
  2. vertical grower
  3. cant predict
  4. deep bite

 

 

 

 

 

 

 

The answer is: A

 

9- Blanch test is used to identify:

 

  1. incompetant lips
  2. deviated nasal septum
  3. a shift in mandible during closing
  4. abnormal frenal attachment

 

 

 

 

 

 

 

The answer is: D

 

10- Weight increase is over 6 billion fold from ovum to birth, what is the ratio of height increase from the prenatal stage to the postnatal stage:

  1. 5000 fold:3fold
  2. 3000fold:3 fold
  3. 3600 fold: 3 fold
  4. 2000 fold : 3 fold

 

 

 

 

 

The answer is: A

 

11- Which of the following is not a period of Prenatal life:

 

  1. Ovum
  2. Embryonal period
  3. Fetal Period
  4. Crown period.

 

 

 

 

The answer is: D

 

12- The embronal period starts and end on which of the following:

 

  1. 1st day to 56th day
  2. 12th day to 90th day
  3. 14th day to 56th day
  4. 13th day to 81st day

 

 

 

 

 

 

The answer is: C

 

13- The vertical groove located  in the midline of the upper lip, is known as the  ‘philtrum’, which 2 processes fuse together to form this:

 

  1. Lateral nasal process and maxillary process
  2. Medial nasal process and maxillary process
  3. Lateral nasal process and medial nasal process
  4. None of the above.

 

 

 

 

 

 

The answer is: B

 

14- As the sharp demarcation, made by thee lateral nasal process and the maxillary closes over,  it is converted into:

 

  1. Nasolacrimal duct
  2. Mentolabial sulcus
  3. Thyroglossal duct
  4. All of the above.

 

 

 

 

 

 

The answer is: A

 

15- foramen caecum marks the union of which of tthe following branchial arches:

 

  1. Second and third
  2. First and Second
  3. First and third
  4. All of the above

 

 

 

 

 

 

The answer is: B

 

16- Activity of the Intersphenoidal synchondrosis occurs when:

 

  1. Birth
  2. 3 months of extrauterine life
  3. 6 months of extrauterine life
  4. None of the above

 

 

 

 

 

 

The answer is: A

 

17- Which of the following is the most responsible for the growth of the cranial base:

 

  1. Sphenoethmoidal synchondrosis
  2. Sphenooccipital synchondrosis
  3. Intersphenoidal synchondrosis
  4. Intraoccipital synchondrosis

 

 

 

 

 

 

The answer is: B

 

18-The midsagittal suture closes at which age:

 

  1. Birth
  2. 1st decade of life
  3. 50 years old
  4. Middle of the third decade of life

 

 

 

 

 

 

The answer is: D

 

19- The cranial base which grows in which of the following ways:

 

  1. Downward and forward
  2. Downward and backward
  3. Upward and forward
  4. Upward and backward

 

 

 

 

 

 

The answer is: D

 

20-Missing teeth affects the growth of which structure:

 

  1. Alveolar bone
  2. Condyles
  3. Alveolar ridge
  4. Maxilla

 

 

 

 

 

The answer is: A

 

21- At which stage is the symphysial cartilage  replaced by bone:

 

  1. At birth
  2. Before birth.
  3. At 4 months – 1 year
  4. At Any age

 

 

 

 

 

 

The answer is: C

 

22-Which of the following structures is the major growth centre of the mandible:

 

  1. Condyle
  2. Angle of the mandible
  3. Symphysis
  4. None of the above

 

 

 

 

 

 

The answer is: A

 

23- How is room for the mandibular molars created:

 

  1. Apposition at the anterior border of ramus and resorption at the posterior border of ramus
  2. Resorption at the anterior border of ramus and resorption at the posterior border of ramus
  3. Apposition at the anterior border of ramus and apposition at the posterior border of ramus
  4. Resorption at the anterior border of ramus and apposition at the posterior border of ramus

 

 

 

 

 

 

The answer is: D

 

24- Growth spurts occur in girls at approximately 3 years of age, the second growth spurt is between 6-7years, when is the third growth spurt:

 

  1. 11-12 years
  2. 17-18years.
  3. 21-23 years
  4. 30-32 yers.

 

 

 

 

 

The answer is: A

 

25- What best describes the Scammons General tissue growth curve:

 

  1. S- shaped
  2. M-shaped
  3. L shaped
  4. O-shaped

 

 

 

 

 

 

The answer is: A

 

26-The earliest sign of the dental lamina is seen at which point of intrauterine life:

 

  1. 5th month
  2. 4th month
  3. 6th week
  4. 30 weeks

 

 

 

 

 

 

The answer is: C

 

27- Permanent teeth that replace the deciduous dention develops from which of the following:

 

  1. Buccal extention of the dental lamina
  2. Lingual extension of the dental lamina
  3. Distal extension of the dental lamina
  4. Mesial extension of the dental lamina.

 

 

 

 

 

 

The answer is: B

 

28- The permanent molars form which aspect of the dental lamina:

 

  1. Buccal extention of the dental lamina
  2. Lingual extension of the dental lamina
  3. Distal extension of the dental lamina
  4. Mesial extension of the dental lamina.

 

 

 

 

 

 

The answer is: C

 

29- The development of teeth can be divided into 3 stages, Cap stage, Bell stage and bud stage.  What is the correct order of these stages:

 

  1. Cap stage, bell stage, bud stage.
  2. Bell stage, bud stage, cap stage.
  3. Bud stage, Cap stage, bell stage.
  4. Bud stage, bell stage, cap stage.

 

 

 

 

 

 

The answer is: C

 

30- What term is used to describe teeth present at the time of birth:

 

  1. neonatal teeth.
  2. subluxated teeth.
  3. Ankylosed teeth.
  4. Natal teeth.

 

 

 

 

 

 

The answer is: D

 

31-In what order do the primary teeth erupt:

 

  1. A,B,D,C,E
  2. A,B,C,E,D
  3. A,B,C,D,E
  4. A,C,B,D,E

 

 

 

 

 

The answer is: A

 

32-Limited space in the deciduous dentition at age 5years and 6months, suggests which of the following:

 

  1. Crowding may occur in the permenant dentition
  2. Spacing may occur in permenant dentition
  3. An Anterior open bite is more likely to form
  4. A posterior open bit is likely to occur.

 

 

 

 

 

 

The answer is: A

 

33- The primary dentition should all be erupted by what age:

 

  1. 1 years old.
  2. 5-6 years.
  3. 7 years.
  4. 2.5-3.5 years.

 

 

 

 

 

 

The answer is: D

 

34- A midline diastama between the permenant incisors of an 8 year old should be given which of the following advice:

 

  1. Extract the central incisors, to prevent lateral incisors from drifting.
  2. An orthodontic referral
  3. Wait till the canines erupt, as the diastama could correct its self.
  4. The diastama will get bigger with age.

 

 

 

 

 

 

The answer is: C

 

35- A 10year old boy has his maxillary 1st deciduous molar tooth extracted  due to caries, what should the Dentist do next in regards to this:

 

  1. Extract maxillary left 1st deciduous molar tooth
  2. Provide a space maintainer
  3. provide an implant
  4. take an xray to to asses the first premolar.

 

 

 

 

 

 

The answer is: D

 

36-For the maxillary dentition, the usual sequence of eruption is:

 

  1. 1-2-3-4-5-6-7
  2. 6,1-2-3-4-5-7
  3. 6-1-2-4-3-5-7
  4. 6-1-2-4-5-7-3

 

 

 

 

 

 

The answer is: C

 

37-The order of eruption in the mandibular arch is usually:

 

  1. 1-2-3-4-5-6-7
  2. 6-1-3-4-5-2-7
  3. 6-1-2-3-4-5-7
  4. 7-6-5-4-3-2-1

 

 

 

 

 

 

The answer is: C

 

38-Once the teeth have erupted, after how long is root formation complete:

 

  1. 1 year
  2. 2 year
  3. 3-4 years
  4. 6-7 years.

 

 

 

 

 

 

The answer is: C

 

39-What term is given to 2 teeth that have swapped placed:

 

  1. Ankylosed
  2. Subluxed
  3. Transposition
  4. inclined

 

 

 

 

 

 

The answer is: C

 

40- The malocclusion of the dentition seen in the transverse plane is:

 

  1. Over jet
  2. Over bite
  3. Open bite
  4. Cross bite

 

 

 

 

 

 

The answer is: D

 

41- Which of the following habits in childhood may cause the maxillary central incisors to procline:

 

  1. Not brushing teeth
  2. Grinding of teeth
  3. Thumb sucking
  4. None of the above

 

 

 

 

 

The answer is: C

 

42-Which of the following orthodontic tools can be used to help the thumb sucking habit:

 

  1. A functional appliance worn at night.
  2. Cribs that are placed on the palatal surface on the upper incisor teeth.
  3. twin block appliance.
  4. None of the above.

 

 

 

 

 

The answer is: B

 

43- Which of the following conditions is true regarding lateral tongue thrust habit:

 

  1. It can be treated with removable or fixed orthodontic appliances
  2. It is associated with a deep over bite.
  3. It is associated with a posterior cross bite
  4. All of the above

 

 

 

 

 

 

The answer is: D

 

44- A thumb sucking, lip biting and tongue thrusting habit can commonly present which of the following:

 

  1. Proclined anterior teeth
  2. Anterior crossbite
  3. Posterior crossbite
  4. Missing teeth

 

 

 

 

 

 

The answer is: A

 

45- A class 3 malocclusion may be characterised by all of the following, EXCEPT:

 

  1. Anterior cross bite
  2. Posterior cross bite
  3. Broad upper arch
  4. Forward path of closure

 

 

 

 

 

The answer is: C