Orthodontics Multiple Choice Question And Answers

Orthodontics Multiple Choice Questions

Question 1. According to Wolf’s law:

1. Human teeth drift mesially as interproximal wear occur
2. Pressure causes bone resorption
3. The optimal level of force for moving teeth is 10 to 200 gm
4. Bone trabeculae line up in response to mechanical stress

Answer. 4. Bone trabeculae line up in response to mechanical stress

Question 2. Overjet is defined as:

1. Horizontal overlap
2. Vertical overlap
3. Transverse plane discrepancy
4. All of the above

Answer. 1. Horizontal overlap

Question 3. Abnormal thick labial frenum results:

1. Midline diastema
2. Imbrication
3. Labial inclination of incisors
4. All of the above

Answer. 1. Midline diastema

Read And Learn More: Orthodontics Question And Answers

Question 4. Hyperactive mentalis muscle is the feature of:

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

Answer. 2. Class 2 div. 1

Question 5. If the force applied is through tooth’s center of resistance than tooth will:

1. Tip
2. Translate
3. Move bodily
4. Intrude

Answer. 2. Translate

Question 6. Anchorage is most effective in:

1. Round roots
2. Flat roots
3. Triangular roots
4. All of these equally

Answer. 4. All of these equally

Question 7. Examples of fixed functional appliance:

1. Activator
2. Frankel
3. Bimler
4. Herbst

Answer. 4. Herbst

Question 8. Elastics are used in fixed appliance:

1. To correct Class 2 molar relation
2. To correct Class 2I molar relation
3. Directly attached to appliance component
4. All of the above

Answer. 4. All of the above

Question 9. Extraction of permanent molars is called:

1. Balanced extraction
2. Serial extraction
3. Wilkinson’s extraction
4. Compensated extraction

Answer. 2. Serial extraction

Question 10. Which of the following wires are called as shaping memory wires?

1. Stainless steel round wire
2. Multiflex round wire
3. Nickel titanium wires
4. Stainless steel edgewise wire.

Answer. 3. Nickel titanium wires

Question 11. Lip bumpers are used to move:

1. Lower molar distally
2. Lower incisor distally
3. Upper incisor labially
4. Upper molar distally

Answer. 1. Lower molar distally

Question 12. A tooth will translate when the center of rotation in at:

1. The incisal edge
2. The bracket
3. Infinity
4. The root apex

Answer. 3. Infinity

Question 13. The adam drap is made of:
1. 24 mil wire
2. 28 mil wire
3. 23 mil wire
4. 22 mil wire

Answer. 2. 28 mil wire

Question 14. Optimal orthodontic force according to Schwartz is:

1. 30-36 grams per sq cm
2. 20-26 grams per sq cm
3. 20-26 grams per sq inch
4. 20-26 grams per sq mm

Answer. 2. 20-26 grams per sq cm

Question 15. Denholtz appliance is used for:

1. Correction of open bite
2. Distalization of the upper molars
3. Correction of deep bite
4. Correction of anterior crossbite

Answer. 2. Distalization of the upper molars

Question 16. 18/8 stainless steel:

1. 18% Nickel, 8% chromium
2. 18% Chromium, 8% copper
3. 18% chromium, 8% nickel
4. None of the above

Answer. 3. 18% chromium, 8% nickel

Question 17. The main criteria for serial extraction is:

1. Spacing
2. Crowding
3. Jaw relation
4. Patient’s cooperation

Answer. 1. Spacing

Question 18. Orthodontic correction of which of the following is most easily retained:

1. Anterior crossbite
2. Crowding
3. Diastema
4. Spacing

Answer. 1. Anterior crossbite

Question 19. Which of the following cannot act on a space maintainer?

1. Well restored tooth
2. Lingual arch
3. Nance holding arch
4. Maxillary expansion device

Answer. 4. Maxillary expansion device

Question 20. A helix is placed for:

1. Activation
2. Increasing the flexibility and range
3. Esthetics
4. Retention

Answer. 2. Increasing the flexibility and range

Question 21. Cranium to face ratio at birth is:

1. 40:1
2. 5:1
3. 8:1
4. 2:1

Answer. 3. 8:1

Question 22. The major growth center of mandible is:

1. Symphysis
2. Condyle
3. Alveolar bone
4. None of the above

Answer. 2. Condyle

Question 23. With the growth of mandible from birth to the adult stage the gonial angle:

1. Increases
2. Decreases
3. Remains the same
4. First increases then decreases

Answer. 2. Decreases

Question 24. The first ossification center of mandible in relation to Meckele’s cartilage develops:

1. Mesial to Meckele’s cartilage
2. Superior to Meckele’s cartilage
3. Lateral to meckle’s cartilage
4. Within the Meckele’s cartilage

Answer. 3. Lateral to meckle’s cartilage

Question 25. Which of the following structures do not contribute to cranial growth?

1. Sphenoethmoidal synchondrosis
2. Sphenooccipital synchondrosis
3. Frontonasal suture
4. Lambdoid suture

Answer. 4. Lambdoid suture

Question 26. The first evidence of dental lamina is seen at:

1. 4th week of intrauterine life
2. 6th week of intrauterine life
3. 3rd month of intrauterine life
4. 4th month of intrauterine life

Answer. 6th week of intrauterine life

Question 27. The incisal liability in maxillary arch and the mandibular arch is respectively:

1. 10 mm and 8 mm
2. 7 mm and 5 mm
3. 3 mm and 6 mm
4. 4 mm and 12 mm

Answer. 2. 7 mm and 5 mm

Question 28. According to Edward Angle the position of maxillary first permanent molar is fixed in relation to:

1. Key ridge
2. ANS
3. PNS
4. Pterygoid process

Answer. 1. Key ridge

Question 29. Tooth erupts into oral cavity when:

1. One third root formation completed
2. Two third root formation completed
3. Root is fully formed
4. Crown is fully formed

Answer. 4. Crown is fully formed

Question 30. A boy aged 8 years has lost his maxillary deciduous second molar on right side due to caries. Treatment by the dentist at this stage involves:

1. Extraction of deciduous maxillary second molar on left side to maintain symmetry of maxillary arch.
2. Mesial movement of maxillary first permanent molar on right side to close the space created by lost tooth.
3. Immediate space maintainer
4. None of the above

Answer. 3. Immediate space maintainer

Question 31. The six keys to normal occlusion was introduced by:

1. Dewey
2. Andrews
3. Tweed
4. Angle

Answer. 2. Andrews

Question 32. Enlow’s “V” principle of growth is found in:

1. Cranial base
2. Maxilla only
3. Maxilla and mandible
4. None of the above

Answer. 3. Maxilla and mandible

Question 33. As skeletal changes take place gonion moves:

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

Answer. 2. Downward and backward

Question 34. Sequence of eruption of permanent maxillary teeth:

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

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

Question 35. In occlusion the teeth have:

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

Answer. 4. Surface-to-surface contact

Question 36. Hyperactive mentalis muscle is a prominent feature of:

1. Class 1
2. Class 2 Div. 1
3. Class 2 Div. 2
4. Class 3

Answer. 2. Class 2 Div. 1

Question 37. Chin cup is used to correct:

1. Skeletal Class 1 malocclusion
2. Skeletal Class 2 malocclusion
3. Skeletal Class 3 malocclusion
4. Dental Class 1 malocclusion

Answer. 3. Skeletal Class 3 malocclusion

Question 38. Oral drive theory to explain thumb sucking habit was given by:

1. Benjamin
2. Sears and Wise
3. Sigmund Freud
4. Sheldon

Answer. 2. Sears and Wise

Question 39. Apertognathia means:

1. Anterior crossbite
2. Open bite
3. Posterior crossbite
4. Prognathism

Answer. 2. Open bite

Question 40. Prolonged retention is usually needed in:

1. Diastema
2. Mild crowding
3. Anterior crossbite
4. Deep bite

Answer. 1. Diastema

Question 41. Dolichocephalic refers to:

1. Long wide faces
2. Long narrow faces
3. Short wide faces
4. Short narrow faces

Answer. 2. Long narrow faces

Question 42. Calcification of first molar starts at:

1. 2 weeks of IU life.
2. At birth
3. 6 months after birth
4. 30 months after birth

Answer. 2. At birth

Question 43. In Sicher’s theory suture acts as:

1. Has independent growth potential
2. Dependent on cranial base
3. Used for growth adjustment
4. None of the above

Answer. 1. Has independent growth potential

Question 44. Following profile is more prone for fractures of maxillary incisors:

1. Class 1
2. Class 2 Div. 1
3. Class 2 Div. 2
4. Class 3

Answer. 2. Class 2 Div. 1

Question 45. The cause of pseudo class 3 malocclusion is:

1. Developmental deficiency
2. Increased mandibular growth
3. Functional abnormality
4. Hormonal disturbances

Answer. 3. Functional abnormality

Question 46. In Ackermann-Profit classification, outer envelop represents:

1. Alignment
2. Profile
3. Transverse relation
4. Vertical relation

Answer. 1. Alignment

Question 47. Fishman’s index is used in relation with:

1. Population
2. Hand-wrist radiograph
3. Cephalogram
4. Periodontal disease

Answer. 2. Hand-wrist radiograph

Question 48. Which of the following does not be on the mandible?

1. Pogonion
2. Menton
3. Porion
4. Gnathion

Answer. 3. Porion

Question 49. Angle of convexity:

1. SNA
2. SNB
3. N-A- Pog
4. ANB

Answer. 3. N-A- Pog

Question 50. The appliance used to treat thumb sucking:

1. Crib appliance
2. Frankel appliance
3. Bionator
4. Activator

Answer. 1. Crib appliance

Question 51. The term orthodontics coined by:

1. Le Felon of France
2. Hunter
3. Carabelli
4. Norman Kigsley

Answer. 1. Le Felon of France

Question 52. Oral and nasal capsule of functional growth is related to:

1. Periosteal matrix
2. Sutural matrix
3. Capsular matrix
4. None of the above

Answer. 3. Capsular matrix

Question 53. The ugly-duckling stage is seen at the age of:

1. 6–7 years
2. 9–10 years
3. 10–12 years
4. 12–14 years

Answer. 2. 9–10 years

Question 54. If dentition is placed close to Frankfort horizontal plane then it is called as:

1. Protraction
2. Attraction
3. Abstraction
4. Contraction

Answer. 2. Attraction

Question 55. Acromegaly is associated with:

1. Class 1 malocclusion
2. Class 2 malocclusion
3. Class 3 malocclusion
4. Class 1 crossbite

Answer. 3. Class 3 malocclusion

Question 56. The most anterior part of bony chin:

1. Gonion
2. Pogonion
3. Menton
4. Gnathion

Answer. 2. Pogonion

Question 57. The cells involved in bone resorption are:

1. Osteoblasts
2. Osteoclasts
3. Osteocytes
4. None of these

Answer. 2. Osteoclasts

Question 58. Maximum resistance to tooth movement is given by:

1. Mandibular molar
2. Maxillary molar
3. Mandibular canine
4. Maxillary canine

Answer. 1. Mandibular molar

Question 59. Example for fixed functional appliance:

1. Activator
2. Frankel
3. Bimler
4. Herbst

Answer. 2. Frankel

Question 60. Which of the following is the non-invasive method of gaining space?

1. Slenderization
2. Expansion
3. Extraction
4. All of the above

Answer. 2. Expansion

Question 61. Calcification of first permanent molar starts at:

1. 11/2 week of IU life
2.  At birth
3. 6 months after birth
4. 21/2 years after birth

Answer. 2. At birth

Question 62. Eruption of teeth is delayed in all of the following except:

1. Hypothyroidism and cleidocranial dysplasia
2. Acromegaly and hyperthyroidism
3. Rickets and cherubism
4. Cretinism and dentigerous cysts

Answer. 1. Hypothyroidism and cleidocranial dysplasia

Question 63. The most reproducible relation of the jaws is:

1. Centric occlusion
2. Centric relation
3. Protrusive contact position
4. Lateral contact position

Answer. 2. Centric relation

Question 64. A pseudo class 3 is differentiated from true class 3 by:

1. Presence of premature contacts
2. Normal gonial angle
3. Deviated path of closure
4. All of the above

Answer. 4. All of the above

Question 65. Abnormal muscular activity more often is result of:

1. Bruxism
2. Nail biting
3. Tongue thrusting
4. Tongue sucking

Answer. 3. Tongue thrusting

Question 66. Blanch test is used in the diagnosis of:

1. Abnormal frenal attachments
2. Pseudo Class 3
3. Tongue thrusting
4. Thumb sucking

Answer. 1. Abnormal frenal attachments

Question 67. Arch perimeter is measured with:

1. Cephalogram
2. Brass wire
3. Vernier calliper
4. Occlusal radiograph

Answer. 2. Brass wire

Question 68. Which of the following landmarks is present at the angle of mandible?

1. Gnathion
2. Gonion
3. Pogonion
4. Porion

Answer. 2. Gonion

Question 69. Carpal radiographs is used for assessment of:

1. Bone condition
2. Chronological age
3. Treatment plan
4. Skeletal maturation

Answer. 4. Skeletal maturation

Question 70. Y-axis is used to analyze:

1. Maxillary growth
2. Mandibular growth
3. Both maxillary and mandibular growth
4. To design appliance

Answer. 2. Mandibular growth

Question 71. In translation center of rotation is at:

1. Apical 1/3rd
2. Infinity
3. Apex
4. Coronal 1/3rd

Answer. 2. Infinity

Question 72. Baker’s anchorage is a type of:

1. Intermaxillary anchorage
2. Intramaxillary anchorage
3. Extraoral anchorage
4. Skeletal anchorage

Answer. 1. Intermaxillary anchorage

Question 73. Blanch test is used in diagnosis of:

1. Abnormal frenal attachment
2. Pseudo class 3
3. Tongue thrust
4. Thumb sucking

Answer. 1. Abnormal frenal attachment

Question 74. Posterior bite plane is used in correcting:

1. Deep bite
2. Anterior crossbite
3. Posterior crossbite
4. Crowding

Answer. 2. Anterior crossbite

Question 75. Anterior open bite is caused by:

1. Bruxism
2. Lip biting
3. Thumb sucking
4. Nail biting

Answer. 3. Thumb sucking

Question 76. Example of fixed functional applications:

1. Activator
2. Frankel
3. Oral screen
4. Herbst

Answer. 4. Herbst

Question 77. The process of securing arch wire to the bracket is known as:

1. Separation
2. Bonding
3. Ligation
4. Isolation

Answer. 3. Ligation

Question 78. Wilkinson’s extraction is:

1. Extraction of 1st molars
2. Extraction of 2nd molars
3. Extraction of 3rd molars
4. Extraction of 1st premolars

Answer. 1. Extraction of 1st molars

Question 79. Vestibular screen works on the principle of:

1. Forces application
2. Forces elimination
3. Both of the above
4. None of the above

Answer. 3. Both of the above

Question 80. Which of the following is not a type of a labial bow?

1. Short
2. Long
3. Medium
4. Reverse

Answer. 3. Medium

Question 81. Which branch of orthodontics is mostly related to mixed dentition period?

1. Preventive
2. Interceptive
3. Corrective
4. Surgical

Answer. 2. Interceptive

Question 82. The body tissue that grows rapidly but shows minimal growth after the age of 6 – 7 years is:

1. Neural tissue
2. Lymphoid tissue
3. Genital tissue
4. Skeletal tissue

Answer. 1. Neural tissue

Question 83. Servosystem theory of growth was given by:

1. Scot
2. Petrovic
3. Limborgh
4. Van der Klaw

Answer. 2. Petrovic

Question 84. Most of the mesenchymal structures of the face are formed from:

1. Ectoderm
2. Endoderm
3. Neural crest cells
4. Mesoderm

Answer. 3. Neural crest cells

Question 85. At what age child is expected to have 12 primary teeth and 12 erupted permanent teeth:

1. 4.5 years
2. 6.5 years
3. 8.5 years
4. 11.5 years

Answer. 3. 11.5 years

Question 86. Most of the Leeway space is contributed by:

1. Second primary molar
2. Primary canine
3. First primary molar
4. Same by all

Answer. 1. Second primary molar

Question 87. The final form of dental arch is finally determined by:

1. Facial type
2. Growth pattern
3. Angle’s classification
4. Balance between intraoral and extraoral muscle force

Answer. 4. Balance between intraoral and extraoral muscle force

Question 88. In occlusion the teeth have:

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

Answer. 4. Surface-to-surface contact

Question 89. If the tooth has not erupted to the line of occlusion it is called:

1. Supraversion
2. Torsiversion
3. Rotated
4. Infraversion

Answer. 4. Infraversion

Question 90. Which one of the following has maximum familial tendency?

1. Protruded maxillary incisors
2. Open bite
3. Deep bite
4. Upper and lower crossbite

Answer. 3. Deep bite

Question 91. Rearward resorption is seen in:

1. Application of light forces
2. Application of heavy forces
3. Both of the above
4. None of the above

Answer. 2. Application of heavy forces

Question 92. A typical formulation of stainless steel wire for orthodontic use has:

1. 18% chromium and 8% nickel
2. 18% nickel and 8% chromium
3. 18% chromium and 8% gold
4. 8% gold and 18% palladium

Answer. 1. 18% chromium and 8% nickel

Question 93. Anchorage is:

1. Resistance to unwanted tooth movement
2. Resistance to wanted tooth movement
3. Resistance to both wanted and unwanted tooth movement
4. None of the above

Answer. 1. Resistance to unwanted tooth movement

Question 94. Tooth movement most likely to relapse unless adequate retention is applied is:

1. Extrusion
2. Intrusion
3. Tipping
4. Rotation

Answer. 4. Rotation

Question 95. Tongue blade is a simple device used for correction of:

1. Lip sucking
2. Finger sucking
3. Tongue thrusting
4. Incisor crossbite

Answer. 4. Incisor crossbite

Question 96. The following is not a component of fixed appliance:

1. Bands
2. Brackets
3. Open coil spring
4. Adam’s clasp

Answer. 4. Adam’s clasp

Question 97. The following is not a myofunctional appliance:

1. Activator
2. Begg’s appliance
3. Frankel
4. Oral screen

Answer. 2. Begg’s appliance

Question 98. Face mask therapy is used to:

1. Push maxilla posteriorly
2. Pull maxilla anteriorly
3. Pull mandible anteriorly
4. None of the above

Answer. 2. Pull maxilla anteriorly

Question 99. Which of the following condition should be treated as soon as it is seen?

1. Proclination
2. Crowding
3. Anterior tooth crossbite
4. Spacing

Answer. 3. Anterior tooth crossbite

Question 100. Intermaxillary elastics used in fixed orthodontics are worn:

1. In same arch
2. Between opposing arches
3. Only in maxilla
4. Only in mandible

Answer. 2. Between opposing arches

Question 101. Growth of condyle is by:

1. Membranous growth
2. Interstitial growth
3. Cartilaginous growth
4. Bony Apposition

Answer. 3. Cartilaginous growth

Question 102. Spheno-occipital synchondrosis closes at the age of:

1. 6 year
2. Early puberty
3. Early adult age
4. It never closes

Answer. 3. Early adult age

Question 103. Incisal liability in maxillary arch is:

1. 7.6 mm
2. 5 mm
3. 1.7 mm
4. 3.2 mm

Answer. 1. 7.6 mm

Question 104. What would be the treatment choice for adult with Class 2 skeletal malocclusion with recessive chin and normal maxilla:

1. Fixed orthodontics only
2. Functional appliance
3. Surgical orthodontics
4. All the above

Answer. 3. Surgical orthodontics

Question 105. Most common orofacial malformation producing malocclusion is:

1. Ectodermal dysplasia
2. Pierre Robin syndrome
3. Clef lip and palate
4. Osteogenesis imperfecta

Answer. 3. Clef lip and palate

Question 106. Mentalis muscle contraction causes lip to…………

1. Retrede
2. Protrude
3. Inversion
4. Eversion

Answer. 2. Protrude

Question 107. Normal nasolabial angle is:

1. 110°
2. 70°
3. 55°
4. 155°

Answer. 1. 110°

Question 108. Torsiversion refers to:

1. Change in inclination
2. Impaction of tooth
3. Change in position
4. Rotation around tooth axis

Answer. 4. Rotation around tooth axis

Question 109. Surgery of cleft lip is advocated at:

1. 3 to 6 months
2. 3 years
3. 1 year
4. 9 months

Answer. 1. 3 to 6 months

Question 110. Heavy forces on periodontal ligament cause:

1. Hyalinization
2. Gestalt bone reception
3. Osteoclastic activity around tooth
4. Osteoblastic activity

Answer. 1. Hyalinization

Question 111. First diagnostic setup was given by:

1. Angle
2. Kesling
3. Tweed
4. None of the above

Answer. 2. Kesling

Question 112. Normal value for FMA angle is:

1. 45°
2. 10°
3. 25°
4. 5°

Answer. 3. 25°

Question 113. Maxillary and mandibular incisor protrusion with spacing indicates:

1. Mouth breathing habit
2. Thumb sucking
3. Tongue thrusting
4. None of the above

Answer. 4. None of the above

Question 114. Angle’s classification of malocclusion was given in which year:

1. 1899
2. 1999
3. 1909
4. None of the above

Answer. 3. 1909

Question 115. Which will exhibit more flexibility:

1. NiTi
2. TMA
3. Stainless steel
4. None of the above

Answer. 1. NiTi

Question 116. If ANB angle is more than 40. It indicates:

1. Class 1 malocclusion
2. Class 2 malocclusion
3. Class 3 malocclusion
4. None of the above

Answer. 2. Class 2 malocclusion

Question 117. Timing for pubertal growth spurt in males is:

1. 7 to 9 years
2. 13 to 15 years
3. 15 to 18 years
4. Above 18 year

Answer. 2. 13 to 15 years

Question 118. Which is the most stable landmark in cephalogram:

1. Sella
2. Nasion
3. Porion
4. Point A

Answer. Sella

Question 119. Incline plane is constructed:

1. 45° to occlusal plane
2. 70° to occlusal plane
3. 25° to occlusal plane
4. None of the above

Answer. 1. 45° to occlusal plane

Question 120. After mixed dentition stage the arch length from first molar to first molar is usually:

1. Decreases
2. Increases
3. Remains same
4. None of the above

Answer. 1. Decreases

Question 121. Which is the supplemental diagnostic aid:

1. Study casts
2. Facial photographs
3. Cephalogram
4. Clinical examination

Answer. 3. Cephalogram

Question 122. Blanch test is used for diagnosis of:

1. Pseudo class 3
2. Abnormal frenal attachment
3. Tongue thrusting
4. Thumb sucking

Answer. 2. Abnormal frenal attachment

Question 123. In mixed dentition, which of the following may be considered as a self correcting problem with age:

1. Unilateral loss of primary canine
2. Lack of inter – dental spaces
3. Distal step
4. Open bite

Answer. 3. Distal step

Question 124. Baker’s anchorage is a type of:

1. Intermaxillary anchorage
2. Intramaxillary anchorage
3. Extraoral anchorage
4. Skeletal anchorage

Answer. 1. Intermaxillary anchorage

Question 125. Total mandibular arch contained in the maxillary arch is:

1. Scissor bite
2. Cross bite
3. Deep bite
4. Reverse bite

Answer. 3. Deep bite

Question 126. Fishman’s index is used in relation with:

1. Population
2. Hand wrist radiograph
3. Cephalogram
4. Orthodontic treatment index

Answer. 2. Hand Wrist radiograph

Question 127. Which of the following tells about the maxillomandibular relationship:

1. SNA
2. SNB
3. IMPA
4. ANB

Answer. 4. ANB

Question 128. Which is the example of reciprocal anchorage:

1. Midline diastema correction
2. Using Class 2 elastics
3. Through the bite elastics
4. Both a and c

Answer. 4. Both 1 and 3

Question 129. Which of the wire is called as shape memory wire:

1. Stainless steel wire
2. Multiflx wire
3. Nickel titanium wire
4. Coaxial wire

Answer. 3. Nickel titanium wire

Question 130. Optimum orthodontic force should not exceed the:

1. Arterial blood pressure
2. Venous blood pressure
3. Capillary blood pressure
4. Masticatory pressure

Answer. 3. Capillary blood pressure

Fill In The Blanks

Question 1. The pharyngeal muscle that forms the part of buccinator muscle is ……………

Answer. Superior constrictor

Question 2. Total Leeway space of Nance in mandibular arch is……………

Answer. 3.4 mm

Question 3. Concave profile is seen in…………… malocclusion.

Answer. Class 3

Question 4. Sphenooccipital synchondrosis closes at the age of…………… years.

Answer. 20

Question 5. Flush terminal plane is seen in relation to which tooth……………

Answer. Second primary molar

Question 6. The angle of convexity is measured as angle ……………

Answer. to the extent of maxillary basal arch at its anterior limit relative to the total facial profie

Question 7. The optimal orthodontic force is …………… gm/cm2 of root surface area.

Answer. 20 to 25

Question 8. The moment to force ratio (M/F) for translator tooth movement is ……………

Answer. 10:1

Question 9. …………… is an example of fied functional appliance.

Answer. Herbst appliance

Question 10. Pericision/CSF is done to prevent the relapse of ……………teeth.

Answer. Rotated

Question 11. Name of one commonly used cephalometric analysis is ……………

Answer. Steiner’s analysis

Question 12. Name of one commonly used mixed dentition analysis is ……………

Answer. Moyer’s analysis

Question 13. One common cephalometric reference plane is ……………

Answer. ANB

Question 14. Class 3 malocclusion have …………… profie.

Answer. Concave

Question 15. Andrews gave …………… keys of occlusion.

Answer. Six

Question 16. ………………….. is used to assess skeletal age.

Answer. Hand-Wrist radiograph

Question 17. Osteoclasts lie in …………… lacunae.

Answer. Howship’s

Question 18. Intermaxillary anchorage example is …………… Anchorage.

Answer. Baker’s

Question 19. …………… spring is used for maxillary expansion

Answer. Coffin

Question 20. …………… is the active component of fied appliance.

Answer. Arch wire

Question 21. Correction of ………………….. bite by cross elastics is known as Baker’s anchorage.

Answer. Cross

Question 22. Another name for infantile swallowing is ……………………. swallowing.

Answer. Visceral or Reverse infantile

Question 23. ……………….. Frankel appliance is used for correction of class 2 Div. 1 malocclusion.

Answer. FR1

Question 24. Target to source distance in a cephalostat is………………….. inches.

Answer. 60

Question 25. Closure of spheno-occipital synchondrosis takes place at the age of……………………..

Answer. 20 years

Question 26. Lip bumper is used for…………………

Answer. Distalization of lower molars

Question 27. Dentists act was framed in the year…………………….

Answer. 1948

Question 28. Posterior clearance in anterior bite plane is………………………

Answer. 2–3 mm

Question 29. Adam’s clasp is fabricated by ………………..mm stainless steel wire.

Answer. 0.7

Question 30. Father of modern orthodontics is……………………….

Answer. Edward Angle

Question 31. Hyrax is a type of ………………………. appliance.

Answer. Rapid maxillary expansion

Question 32. The most common cause of midline diastema is……………………..

Answer. Abnormal labial frenum attchment

Question 33. Caries control is a part of ……………… orthodontics

Answer. Preventive

Question 34. ANB angle in Steiner’s analysis is an indicator of ………………… relationship.

Answer. Maxilla and mandible

Question 35. ………………… is a type of self correcting malocclusion.

Answer. Ugly duckling

Question 36. Shape memory and superelasticity are two unique properties of ……………… arch wire.

Answer. Nickel – Titanium

Question 37. The term ugly duckling stage was coined by…………………

Answer. Broadbent

Question 38. The only malocclusion with monogenetic inheritance is Angle’s ………………. malocclusion.

Answer. Class 3

Question 39. Headgear is a type of ……………….. anchorage.

Answer. Extra-oral

Question 40. Adenoid face is seen in …………… habit.

Answer. Mouth breathing

Question 41. The ugly duckling stage is seen at the age of…………………. years.

Answer. 8 to 9

Question 42. Heavy forces on periodontal ligament cause……………..

Answer. Hyalinization

Question 43. In…………… cases the anchoraging unit should not more than 25%.

Answer. Maximum or critical anchorage

Question 44. ……………….. appliance is used for correction of anterior crossbite.

Answer. Inclined plane

Question 45. Hyperactive mentalis muscle is a prominent feature of………… malocclusion.

Answer. Class 2 Div. 1

Question 46. …………………. is defined as joining the parts of a metal by melting them by the application of heat/pressure without any intermediatory.

Answer. Soldering

Question 47. Total mandibular arch contained within maxillary arch is called…………….. bite.

Answer. Cross

Question 48. Carpal radiograph is used for assessment of……………… maturation.

Answer. Skeletal

Question 49. The age upto which thumb sucking is accepted………….year.

Answer. 31/2 to 4

Question 50. …………. forces best accomplish orthodontic tooth movement.

Answer. Light and continuous

Question 51. ………………………… is considered as the Father of Modern Orthodontics.

Answer. Edward Hartley Angle

Question 52. Serial extraction is a part of………………………orthodontics.

Answer. Interceptive

Question 53. …………………. Is the nerve of fist branchial arch.

Answer. Mandibular nerve

Question 54. The mean value of incisor mandibular plane angle (IMPA) in Tweed’s analysis is………………..

Answer. 90°

Question 55. Overall ratio of more than 91.3% indicates ………………….. tooth material excess in Bolton’s analysis.

Answer. Mandibular

Question 56. ………………… is the simplest type of tooth movement.

Answer. Tipping

Question 57. Intermaxillary anchorage is also termed as …………………. Anchorage.

Answer. Baker’s

Question 58. Edgewise appliance was given by…………………….

Answer. Edward Hartley Angle

Question 59. Herbst appliance is a type of …………………….. appliance.

Answer. Fixed functional

Question 60. Anterior bite plane can be used in correcting …………………….malocclusion.

Answer. Vertical

Question 61. Activator was designed by…………………..

Answer. Viggo Andresen (1908)

Question 62. The concept of expanding V principle was put forward by……………………

Answer. Enlow

Question 63. Localized spacing present mesial to upper canine and distal to lower canine are called as……………………

Answer. Primate space

Question 64. Leeway space in maxilla is……………………..and mandible is……………………

Answer. 1.8 mm and 3.4 mm

Question 65. Movement of tooth around its own axis is called as………………….

Answer. Rotation

Question 66. ………………….are used to create space between adjacent teeth for bonding procedures.

Answer. Separators

Question 67. …………………….is useful adjunctive surgical procedure in which the gingival fiers are incised to prevent relapse.

Answer. Edward’s procedure

Question 68. Intraoral elastics stretched between molars and anterior teeth of the same arch are called…………………… elastics.

Answer. Class 1

Question 69. Rotational tendency of the couple in orthodontics is called as…………………………..

Answer. Moment of the couple

Question 70. ……………………….is defied as the procedure for joining metals by the use of filer material.

Answer. Soldering

Question 71. Cephalometric radiography was introduced in 1931 by……………………………..

Answer. Holly Broadbent Sr. in USA.

Question 72. Resorption of alveolar bone by cells from adjacent marrow spaces is called …………………….

Answer. Undermining resorption or rearward resorption

Question 73. In…………………type of tooth movement only tension areas are present.

Answer. Extrusion

Question 74. Removable appliances produce…………………………. type of tipping.

Answer. Uncontrolled

Question 75. A single force through center of resistance of tooth will cause……………. type of tooth movement.

Answer. Bodily

Question 76. 9 theorums of retention was put forward by ……………………

Answer. Riedel

Question 77. ICON acrenym stands for……………………

Answer. Index of complexity, outcome and need

Question 78. …………………………… malocclusion in single largest group of malocclusion.

Answer. Class 1 (50 to 55%)

Question 79. Mandibular inter canine width completes by …………………………years of age.

Answer. 9

Question 80. Concept of functional matrix theory was given by………………………….

Answer. Melvin Moss (1960)

Question 81. Lymphoid tissue proliferates rapidly in late childhood and reaches almost………………% of about size.

Answer. 200

Question 82. Sutural theory was given by………………….

Answer. Sicher and Weinmann

Question 83. Gum pads usually lasts for ………………months after birth.

Answer. Six

Question 84. Ackerman Proffit classification is based on the ………………….diagram.

Answer. Venn

Question 85. Class 3 malocclusion patients generally have ………………profile.

Answer. Concave

Question 86. Serial extraction has been defied as active supervision of teeth by extraction by………………

Answer. Reducing crowding problems

Question 87. Pendulum appliance is used to………………… the molars.

Answer. Distalize

Question 88. Quad helix is used for……………..expansion.

Answer. Maxillary teeth

Question 89. Riedel has summarized the different concepts and philosophies existing into……………..theories.

Answer. Retention

Question 90. Catlan’s appliance is used to treat anterior……………….

Answer. crossbite

Question 91. The term “orthodontics” wascoined by……………………..

Answer. Sir James Murray

Question 92. FH plane is formed by joining……………………

Answer. orbitale and porion

Question 93. Rate of activation with slow expansion is…………………

Answer. 0.5 mm per week

Question 94. “Whip spring” is used for correction of…………….

Answer. Rotation

Question 95. Is extracted in Wilkinson extraction………………….

Answer. All permanent fist molars

Question 96. Anterior bite plane is used for correction of……………………

Answer. Extrusion

Question 97. P in and Tube appliance is a contribution of………………..

Answer. Angle (1910)

Question 98. Blanch test is used in diagnosis of………………………..

Answer. Midline diastema

Question 99. Adams is………………..component of removable orthodontic appliance.

Answer. Retentive

Question 100. Optimal orthodontic force is……………………g/sq inch

Answer. 129 to 166.7

Question 101. Bionator is developed by…………………..

Answer. Wilhelm Balters of Germany

Question 102. Early mesial shift is utilized by……………………..

Answer. Permanent mandibular and maxillary first molars

Question 103. Centre of resistance in case of multirooted teeth is located at 1 to 2mm apical to the……………….

Answer. Furcation

Question 104. Acid etch technique was introduced by……………….

Answer. Buonocore (1955)

Question 105. Mean value of mandibular plane angle in Steiner’s analysis is……………..

Answer. 32°

Question 106. Dissolves any surface impurities on metal to be joined is called………………..

Answer. Flux

Question 107. Most common etiological cause of midline diastema is abnormal or…………………..labial………….

Answer. Hypertrophic labial frenum

Question 108. Mid sagittal suture opening after rapid palatal expansion is assessed by……………….radiograph.

Answer. Occlusal

Question 109. Hyperactive mentalis muscle is a common fiding of…………………..malocclusion.

Answer. Class 2 division 1

Question 110. Most commonly used clasp is……………………………..

Answer. Adam

Additional Information

Various Scientists in Orthodontics Along with their Discoveries

Various Theories of Growth and the Scientists who had Given Them

Various Theories of Growth and their Summary

Various Cartilages and their Derivatives

Timings of Cranial Base Growth

Various Synchondrosis and their Time of Ossification

Various Stages in Development of Males and Females

Various Numbers of Bone Present in Body

Various Types of Malocclusions and Their Meanings

Various Malocclusions Along with their Percentages of Occurrence

Various Diseases Leading to Jaw Abnormalities

Types of Lips

Types of Head

Types of Facial Form

Types of Facial Divergence

Various Transient Malocclusions

• Transient skeletal Class 2
• Open bite in gum pads
• Flush terminal plane
• Ugly duckling stage
• First deep bite
• Second deep bite

Various Angles and their values

Optimum Forces for Tooth Movement

Various Types of Movements and their Center of Rotation

Various Types of Orthodontic Wires With their Modulus of Elasticity

Various Sizes of Wire with Their Play

For 18 Slot Bracket

For 22 Slot Bracket

Enumeration of Slow Expansion Appliances

• Jack screw
• Coffin spring in maxilla
• Quad helix in maxilla
• Ni – Ti expander
• Schwartz appliance in mandible

Enumeration of Rapid Expansion Appliances

• Removable appliance incorporating jack screw
• Fixed tooth and tissue borne appliances
  • Derichsweiler
  • Hass type
• Fixed tooth borne appliances
  • Isaacson type
  • Hyrax type

Various Analysis

Various Components and Diameter of Wire used in Making Them

Various Bends in Edgewise Appliance

Type of Copper Ni–Ti Alloys

Various Teeth with Band Thickness and Band Width

Some Important Points About various Myofunctional Appliances

Various Surgeries Associated with Different Malocclusions

Various Recommended Observation Periods Before Orthodontic Treatment

Difference Between Angle Class 2 Div And Div 2

Various Exercises for Muscles in Orthodontics

Various Treatment Procedures in Orthodontics with their Disadvantages

Component of Fixed Appliances

• Active components
  • Separators
  • Elastics
  • Archwire
  • Spring
• Passive components
  • Brackets
  • Ligature wire
  • Lock pin
  • Buccal tube

Difference Between Edgewise and Begg’s Technique

Various distances in a X­-ray

 

Various conditions and space maintainers used in them

Retention in Various cases

Recommended observation period before orthodontic treatment

Principles of Bioprogressive therapy

Katz premolar classification

Premolar Class 1: It is identified when the most anterior upper premolar fis exactly into the embrasure created by the distal contact of the most anterior lower premolar. This definition applies when a full complement of premolars are present that is whether one upper premolar opposes two lower premolars or two upper premolar oppose one lower premolar or whether only one premolar is present in each quadrant in essence these relationships represent perfect interdigitations and the value is 0 millimeter on the calipers.

Premolar Class 2: Here the most anterior upper premolar is occluding mesial to the embrasure created by the distal contact of the most anterior lower premolar. The measurement has a plus sign.

Premolar Class 3: Here the most anterior upper premolar is occluding distal of the embrasure created by the distal contact of the most anterior lower premolar. The measurement has a negative sign.

Various appliances and their force application

Root resorption index at the time of tooth movements

Grade 1: Irregular root contour

Grade 2: Root resorption at apex, less than 2 mm

Grade 3: Root resorption accounting to 2 mm to one-third of root length

Grade 4: Root resorption more than one third of root length