MCQs on Development of Dentition - Orthodontics

# In children, median diastema between maxillary permanent incisors closes with the eruption of:
A. Maxillary permanent first premolars
B. Maxillary permanent lateral incisors
C. Maxillary permanent canines
D. Maxillary permanent second molars

# The average "Leeway space" available in each half of the maxilla is approximately:
A. 0.9 mm
B. 2.9 mm
C. 4.0 mm
D. 6.9 mm

# If a flush terminal plane is present in the deciduous dentition, then the molars will erupt:
A. Initially in class I occlusion
B. Initially in class II occlusion
C. Initially in class III occlusion
D. End to end

# The primate spaces are related to the portion of the diastema that are:
A. distal to the maxillary primary canines and mesial to mandibular primary canines
B. mesial to the maxillary primary canines and distal to the mandibular primary canines
C. distal to both the maxillary and mandibular primary canines
D. mesial to both the maxillary and mandibular primary canines

# Which of the following can be predicted from a flush terminal plane of primary dentition ?
A. Always results in Class I molar relation
B. Always results in class II molar relation
C. Always results in class III molar relation
D. Final molar relation cannot be predicted definitely

# The "ugly duckling" stage of the transitional dentition is characterized by all of the following except:
A. Deep overbite
B. Distoangular axial inclination of the maxillary incisors
C. Mandibular lateral incisors erupting lingual to the mandibular central incisors
D. Possible overjet

# Late mesial shift is due to:
A. Closure of primate spaces
B. Eruption of first permanent molars
C. Related to end on molar relation
D. Closure of Leeway space

# With respect to their permanent successors, the sum of the mesiodistal diameters of the first and second deciduous molars is generally:
A. Less
B. Greater
C. the same
D. not related

# Primate spaces are between:
A. B and C
B. C and D
C. A and C
D. Options A and B

# Spacing seen between the maxillary deciduous teeth in a 6 year old child indicates:
A. Good growth
B. Class III tendency
C. Class II tendency
D. Presence of mesiodens

# Intercanine width in maxilla is increased with:
A. Eruption of lateral incisors
B. Eruption of permanent canines
C. Eruption of premolars
D. Eruption of peg laterals

# Transitional phase of dentition is:
A. During eruption of permanent and exfoliation of deciduous teeth
B. After all permanent teeth have erupted
C. Phase during correction of malocclusion
D. None of the above

# Ugly duckling stage affects:
A. Maxillary anterior teeth
B. Mandibular anterior teeth
C. Both maxillary and mandibular teeth
D. Cause decrease in vertical height

# Which terminal plane is favourable for E/E to have class I molar relationship?
A. Flush terminal plane
B. Mesial step
C. Distal step
D. None of the above

# Good contacts in primary teeth with lack of spacing predicts:
A. Normal occlusion in permanent teeth
B. Crowding in permanent teeth
C. Anterior cross bite
D. Spaced permanent dentition

# After mixed dentition stage the arch length from first molar to first molar usually:
A. Remains same
B. Increases
C. Decreases
D. Doubles

# Which of the following is a self correcting anomaly ?
A. Ugly Duckling stage
B. Deep bite
C. Retrusion
D. Protrusion

# Leeway space of Nance is utilized in:
A. Early mesial shift of first permanent molars
B. Incisal liability
C. Late mesial shift of first permanent molars
D. Secondary spacing of first permanent molars

# The ugly duckling stage is seen at the age of:
A. 6-7 years
B. 8 - 9 years
C. 10 - 12 years
D. 12 - 14 years

# Spacing in anterior teeth in deciduous dentition:
A. Common and desirable
B. Uncommon and undesirable
C. Common and undesirable
D. Uncommon

# A 9 year old child came to the dental clinic with spacing in anterior teeth. The line of treatment is:
A. Fixed appliance
B. Removable appliance
C. Inclined Plane
D. No treatment, observation of the patient

# Difference in width of permanent and primary incisors is:
A. Incisal guidance
B. Incisal inclination
C. Overjet
D. Incisal liability

# Leeway space in mandibular arch is:
A. 1.7 mm and greater in mandible than in maxilla
B. 1.7 mm and less in mandible than in maxilla
C. 3.4 mm and greater in mandible than in maxilla
D. 3.4 mm and less in mandible than in maxilla

# Into how many segments the infant's gum pad is divided ?
A. Two in each quadrant
B. Three in each quadrant
C. Two in each jaw
D. Five in each quadrant

# Spaces in deciduous dentition are:
A. Physiological
B. Pathological
C. Incisal liability
D. None of the above

# An 8 year old child has first molar cusp to cusp relation. The treatment is:
A. Fixed appliance
B. Removable appliance
C. Continuous recall and observe
D. None of the above

# In primary dentition, the anatomic structure used to determine the molar relationship is:
A. Mesiobuccal cusp of primary second molar
B. distal plane of primary first molar
C. mesial surface of primary first molar
D. distal plane of primary second molar

# Grooves, which are present in gum pads between the canine and the first molars and relates the upper and lower gum pads are called as:
A. Gingival groove
B. Dental groove
C. Vestibular sulcus
D. Lateral sulcus

# The average Leeway Space available in each half of mandible is:
A. 3.8 mm
B. 1.7 mm
C. 2.4 mm
D. 0.9 mm

# Mesial step formation in deciduous dentition is indication of future:
A. Class II malocclusion
B. Class III malocclusion
C. Anterior crowding
D. Anterior cross bite

# In a newborn child we generally see:
A. Maxillary protrusion
B. Maxillary retrusion
C. Mandibular protrusion
D. Mandibular retrusion

# Which of the following is correct ?
A. The primary teeth begin to erupt at 6 months
B. The eruption of all primary teeth is completed by 2.5 to 3.5 years
C. The sequence of eruption of mandibular permanent teeth is A-B-D-C-E
D. All of the above

# Eruption of the permanent maxillary second molar prior to the maxillary second premolar is:
A. Normal and desirable
B. Abnormal and undesirable
C. Abnormal and desirable
D. Normal and undesirable

# According to Wolff's law:
A. Human teeth drift mesially as interproximal wear occurs
B. Pressure causes bone resorption
C. The optimal level of force for moving teeth is 10 to 200 grams
D. Bone trabeculae line up in response to mechanical stresses

# The commonest teeth involved in transposition are:
A. Maxillary central and lateral incisor
B. Maxillary canine and first premolar
C. Maxillary first and second premolar
D. Maxillary canine and lateral incisor

# Incisal liability on an average in the maxillary arch is:
A. 3mm
B. 6mm
C. 4mm
D. 7.5mm

# Ugly duckling stage of dentition in children is corrected by eruption of which permanent tooth ?
A. Central incisor
B. Lateral Incisor
C. Canine
D. Second molar

# After 6 years of age, the lengthening of mandible occurs mainly:
A. at the symphysis
B. between the canines
C. distal to first permanent molar
D. along the lower border

# Ugly duckling stage coincides with transitional phase:
A. 1st transitional phase
B. Inter transitional
C. 2nd transitional
D. All of the above

# Which of the following is not a transient/self correcting malocclusion ?
A. Spaced primary dentition
B. Deep overbite in primary dentition
C. Flush terminal planes in primary dentition
D. Anterior crossbite in primary dentition

# Safety valve mechanism is:
A. The anteroposterior increment in the maxilla at 14 years
B. Increase in the mandibular inter-canine width at 14 years
C. Increase in the mandibular height at 12 years
D. Increase in the maxillary intercanine width at 12 years

# Midline diastema present in children is self correcting if diastema is not more than:
A. 2.0 mm
B. 1.5 mm
C. 1.0 mm
D. 0.5 mm

# At which stage of Nolla's , the tooth starts erupting ?
A. Stage 5
B. Stage 6
C. Stage 7
D. Stage 8

# Leeway space is due to:
A. Space difference between deciduous canine and molar and their succedaneous permanent teeth
B. Space difference between deciduous incisors and their succedaneous permanent teeth
C. Difference between deciduous and permanent maxillary canine
D. None of the above