Etiological factors of malocclusion (local and general) l Orthodontics MCQ for dental students

8. A child who had a congenital defect of cleft lip and cleft palate is most likely to suffer from which kind of malocclusion a) Bilateral posterior cross bite b) A collapsed anterior mandibular arch c) Protrusion and spacing of maxillary anterior teeth d) Class II division I malocclusion 9. Acromegaly is associated with: a) Class. I malocclusion b) Class. I cross bite c) Class. II malocclusion d) Class. Ill malocclusion 10. Abnormally thick maxillary labial frenum results in a) Maxillary Midline diastema b) Imbrication of incisors c) Labial inclination of incisors d) Anterior deep bite 11. The abnormal swallowing pattern with the poorest prognosis is: a) Simple tongue thrust b) Complex tongue thrust c) Infantile swallow d) Retained infantile swallow 12. Treatment of diastema because of a thick labial frenum is done: a) After frenectomy b) Before eruption of canines c) After eruption of canines d) Before frenectomy 13. The most probable cause of crowding in lower anterior region is: a) Prolonged retention of lower primary incisors b) Premature exfoliation of lower primary incisors c) Presence of supernumerary teeth d) Tooth-size-arch length discrepancy 14. Prolonged retention of primary tooth may lead to a) Altered path of permanent tooth eruption b) Root resorption of adjacent tooth c) Ankylosis of permanent tooth d) Warping of roots of adjacent teeth 15. A child is brought to the clinic with complaint of irregular teeth. The maxillary central incisor is rotated in an otherwise normal occlusion. What should the next step be? a) Check for supernumerary teeth b) Resection of supracrestal fibers c) Exert a couple on tooth d) Fixed orthodontic appliances given 16. A malocclusion is characterized by protrusion of maxilla, labioversion of maxillary incisors deep overbite and overjet. These are typical characteristic of which malocclusion a) Class I b) Class II Div 1 c) Class 11 Div 2 d) Class 111 17. A 9—year-oId patient exhibits left maxillary central incisor in cross bite. Supporting bone is in harmony with tooth size. The most probable cause is: a) Premature extraction of primary right central incisor b) Prolonged retention of primary left central incisor c) Absence of mandibular left central incisor d) All of the above 18. The most common cause of class II malocclusion a) Sleeping habits b) Growth discrepancy c) Thumb and tongue thrusting d) Tooth to jaw size discrepancy. 19. Bruxism bears which one of the following relationships to malocclusion a) Malocclusion is only cause of bruxism b) Malocclusion may be the cause of bruxism c) Correction of occlusal discrepancy always eliminate bruxism d) None of above 20. A 10 year-old patient with class II relationship stops thumb - sucking a) Over-jet will decrease b) Upper incisors will become up right c) There will be crowding of the lower incisors d) A and B 21. Which of the following is not a features of simple tongue thrust swallowing a) Contraction of facial muscle b) Contraction of mandibular elevators c) Teeth apart swallow d) Anterior open bite 22. The oral drive theory to explain thumb sucking habit was given by a) Benjamin b) Sears and wise c) Sigmund freud d) Scheldon 23. Abnormal muscle activity results in a) Bruxism b) nail biting c) Tongue thrusting d) thumb sucking 24. In adenoid facies, the facial profile is a) Long and wide b) Long and narrow c) Short and wide d) Short and narrow 25. Which of the following statements is False a) Heredity plays an important role in the development of normal occlusion. b) A tongue thrusting habit may cause an open bite c) Mouth breathing is a recognized contributing cause of malocclusion d) The cuspids are the most useful teeth for the anchorage of appliances 26. In the pre-school stage what % of the children show thumb-sucking a) Less than 10% b) 10-20% c) More than 50% d) all children 27. Rooting reflex disappears in normal infants by the age of a) 4 months after birth b) 7 months after birth c) 9 months after birth d) 12 months after birth 28. Earnest Klein has classified habits into a) Compulsive and non-compulsive habits b) Intentional and non-intentional habits c) Primary and secondary habits d) Pressure and non-pressure habits 29. Breathing is termed anatomic mouth breathing if a) Short upper lip b) Enlarged Adenoid c) Enlarged Tonsil d) Both A and B 30. The positioning of tongue in infantile swallowing is a) Posterior b) Medial c) Lateral d) Anterior 31. The patients with class II division I malocclusion have a) Hypertonic lower lip b) Hypotonic lower lip c) Hypertonic upper lip d) Hypotonic upper lip 32. In thumb-sucking habit, posterior cross bite occurs due to a) Loss of normal outward thrust of the tongue b) Negative pressure within the oral cavity, which causes buccinator to force the maxillary molar palatally c) Both a and b d) Loss of oral seal 33. Laltoo, a 13-year old child has a severe thumb-sucking habit. On examination he has a Class-II malocclusion, anterior open bite with an over-jet of 12mm. His cephalogram will show: a) Normal anterior and posterior facial heights b) Increased anterior facial height and normal posterior facial height c) Increased posterior facial height and normal anterior facial height d) Increased posterior facial height and increased anterior facial height 34. The effect of enlarged Adenoids on the maxillary growth is by a) Narrowing of maxilla b) Widening of maxilla c) Palatal plane tipped upwards at PNS d) Palate descends down 35. Which of the cephalometric parameter is used to diagnose a long face syndrome patient? a) ANB angle b) SNA angle c) Jaraback ratio d) Saddle angle

MCQs in etiological factors of malocclusion in orthodontics

1. Among the following the most common cause of malocclusion

A. Premature loss of deciduous teeth

B. Late shedding of deciduous teeth

C. Presence of supernumerary teeth

D. Absence of few teeth

2. The most common cause of premature loss of deciduous teeth is:

A. Periodontal disease

B. Caries

C. Gingivitis

D. Congenital deformities

3. Among the following the most commonly seen congenital defect is:

A. Macrognathia

B. Clcidocranial dysostosis

C Oligodontia

D. Cleft lip and cleft palate

4. The clinical feature(s) that is/are associated with cleft lip and cleft palate Ware:

A. Presence of supernumerary teeth

B. Absence of few teeth

C. Both of the above

D. None of the above

5. Milwaukee braces that are used for the treatment of scoliosis on prolonged use can cause:

A Mandibular prognathia

B. Mandibular retrognathia

C. Maxillary prognathia

D. Maxillary retrognathia

6. Delayed eruption of permanent teeth may be due to:

A. Congenital absence of the permanent tooth

B. Presence of supernumerary tooth

C Endocrinal disorders such as hypothyroidism

D. All of the above

7. Delayed eruption of teeth is a characteristic sign of which of the following conditions:

A. Hypothyroidism

B. Hyperthyroidism

C. Hypoparathyroidism

D. Hyperparathyroidism

A. Early loss of deciduous teeth can cause migration of adjacent teeth into the space and can therefore prevent the erupuon of permanent successor
B. Dental caries can lead to premature loss of deciduous teeth there by causing migration of contiguous teeth, abnormal axial inclination and supra-eruption of opposing teeth.
D. Cleft lip and palate occur as a result of non-fusion between the various embryonic processes.
C, Cleft patients may exhibit a number of dental problems including missing teeth, mobile teeth, rotations, cross bite etc.
B. Milwaukee braces derive support from mandible .Thus, prolonged use of these braces can cause marked mandibular growth retardation.
Presence of heavy mucosal barrier and presence of deciduous root fragments that are not resorbed can also block the erupting permanent teeth.
A. Endocrinal disturbances such as hypothyroidism causes prolonged retention of deciduous teeth.

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Malocclusion etiology l Orthodontics mcqs for dental students

Etiological factors of malocclusion (local and general) l Orthodontics MCQ for dental students

MCQs in etiological factors of malocclusion in orthodontics

1. Among the following the most common cause of malocclusion

2. The most common cause of premature loss of deciduous teeth is:

3. Among the following the most commonly seen congenital defect is:

4. The clinical feature(s) that is/are associated with cleft lip and cleft palate Ware:

5. Milwaukee braces that are used for the treatment of scoliosis on prolonged use can cause:

6. Delayed eruption of permanent teeth may be due to:

7. Delayed eruption of teeth is a characteristic sign of which of the following conditions:

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Malocclusion etiology l Orthodontics mcqs for dental students

Etiological factors of malocclusion (local and general) l Orthodontics MCQ for dental students

MCQs in etiological factors of malocclusion in orthodontics

1. Among the following the most common cause of malocclusion

2. The most common cause of premature loss of deciduous teeth is:

3. Among the following the most commonly seen congenital defect is:

4. The clinical feature(s) that is/are associated with cleft lip and cleft palate Ware:

5. Milwaukee braces that are used for the treatment of scoliosis on prolonged use can cause:

6. Delayed eruption of permanent teeth may be due to:

7. Delayed eruption of teeth is a characteristic sign of which of the following conditions:

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Mouth preparation for RPD & Class I l Removable prosthodontics MCQs

Kennedy classification RPD l Removable partial denture MCQs

Major connector of RPD l Removable partial denture MCQs

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