Morphology and Development of Primary and Permanent Teeth

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Pediatric dentistry

The labiolingual difference between upper and lower primary central incisor is:

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a. 1 mm

b- 2 mm

c. 3 mm

d- 2.5 mm

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Cusp of carabelli is seen on the lingual surface of:

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a. Primary mandibular 2nd molar

b. Primary maxillary 2nd molar

c. Primary maxillary 1st molar

d. Primary mandibular 1st molar

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The direction of the enamel rod at cervix in case of primary teeth are directed:

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a. Occlusally

b. Gingivally

c. Horizontally

d. None of the above

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Which of the following is true about primary teeth?

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a. Enamel and dentin are thin

b. Broad proximal molar contact and pronounced cervical ridge

c. There are more number of accessory canals

d. All of the above

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1. Evidence of development of human tooth can be observed as early as:

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(a) 6th week of embryonic life

(b) 11th week of embryonic life

(d) 16th week of embryonic life

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2. Microdontia or macrodontia of teeth is because of damage in stage of tooth development:

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(a) initiation/proliferation

(b) histodifferentiation

(d) apposition

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3. Enamel hypoplasia is because of disturbance____ stage of tooth development:

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(a) initiation/proliferation

(b) historiifferentiation

(d) apposition

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The first macroscopic indication of morphologic development of primary incisors occurs approximately at:

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(a) 11 weeks in utero

(b) 14 weeks in utero

(d) 6 weeks in utero

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In primary teeth, cusp of Carabelli is seen in:

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(a) maxillary first molar

(b) maxillary second molar

(d) mandibular second molar

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The primary tooth which least resembles any of the permanent tooth la:

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(a) maxillary first molar

(b) maxillary second molar

(d) mandibular second molar

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Extreme curvature of the buccal side is characteristic of:

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(a) mandibular first primary molar

(b) mandibular second primary molar

(d) maxillary second primary molar

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Which is true?

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a. The cervicoincisal length of primary maxillary lateral incisor is less than the mesiodistal width

b. The cervicoincisal length of primary maxillary central incisor is greater than its cervicoincisal length

c. Primary teeth have pronounced cervical ridge

d. All of the above

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The primary second molar (mandibular) resembles:

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(a) maxillary first permanent molar

(b) mandibular first permanent molar

(d) mandibular second permanent molar

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The largest cusp of primary maxillary first molar is:

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a. Mesiobuccal cusp

b. Distobuccal cusp

c. Mesiolingual cusp

d. Distolingual cusp

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15 . Which is not true?

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a. Primary pulp is more cellular

b. Primary tooth pulp chamber are large with prominent pulp horn

c. Primary mandibular first molar resembles morphologically with permanent mandibular ﬁrst molar

d. All of the above

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