Free Development of Teeth MCQs with Answers

• A. 4 yrs
• B. 6 yrs
• C. 8 yrs
• D. 10 yrs

Explanation: Root resorption of primary maxillary incisors usually begins at about 4 years of age, well before their exfoliation around 6 to 7 years.

• A. Cusps
• B. Fissures
• C. Grooves
• D. All of the above

Explanation: Each crown lobe develops as a separate area, and normal coalescence leaves developmental grooves marking their union.

• A. Calcification of maxillary primary first premolar is completed at birth
• B. The primary dentition is initiated at 10th month in uterus
• C. The crowns of primary dentition are more yellowish than permanent
• D. Mandibular first molar erupts at one and half years of age

Explanation: The mandibular primary first molar usually erupts at about 13 to 19 months, making one and a half years a suitable approximation.

• A. Mandibular first molar
• B. Mandibular central incisor
• C. Maxillary central incisor
• D. Maxillary second molar

Explanation: The mandibular central incisor is usually the first primary tooth to erupt, at approximately six to eight months.

• A. 4th month of life
• B. 4th month in utero
• C. 41/2 month in utero
• D. 5th month in utero

Explanation: Primary lateral incisor calcification begins at about four and a half months in utero.

• A. From birth to 11 years
• B. From 6 months to 11 years
• C. From 6 years to 11 years
• D. From 6 months to 6 years

Explanation: The primary dentition begins with eruption of the first primary tooth at about 6 months and remains the only dentition until the first…

• A. 12 CDE6
• B. 12C456
• C. 123DE6
• D. 123456

Explanation: At 9 years, the permanent first molars and incisors have usually erupted, while the primary canines and molars remain.

• A. One year
• B. Two years
• C. Three years
• D. Four years

Explanation: After crown enamel is complete, a permanent tooth generally requires about three years to complete its eruption pathway.

• A. 2 years
• B. 4 years
• C. 6 years
• D. 8 years

Explanation: Calcification of the crowns of nearly all permanent teeth, except the third molars, is completed by about 8 years.

• A. 3 years
• B. 1 years
• C. 2 years
• D. 1 month

Explanation: The roots of primary teeth usually complete formation about one year after eruption.

• A. 8 months
• B. 18 months
• C. 8 years
• D. 16 years

Explanation: Calcification of the permanent third molar usually begins around 7 to 8 years of age. Among the choices, 8 years is the accepted value.

• A. Premolars, incisors and 1st molars
• B. Canine and 2nd molars
• C. Incisors and 1st molars
• D. Canines, premolars and2nd molars

Explanation: At age 6, the permanent canines, premolars, and second molars are still undergoing calcification and can be affected by tetracycline…

• A. 4-5 months
• B. 3-4 months
• C. 5-6 months
• D. 6-7 months

Explanation: An erupting premolar typically takes about 4 to 5 months to move through 1 mm of overlying bone.

• A. 20 months
• B. 18 months
• C. 24 months
• D. 28 months

Explanation: The maxillary second primary molar usually erupts at about 28 months, within the broader normal range of roughly 25 to 33 months.

• A. 20
• B. 22
• C. 24
• D. 30

Explanation: At birth, the 20 primary tooth germs are present, and the four permanent first molars have also begun calcifying, giving 24 teeth visible…

• A. 6 EDC21/ 6EDC21
• B. 6EDCBA/ 6EDC21
• C. EDC21/EDC21
• D. 76EDC21/ 7EDC21

Explanation: At about 9 years, the permanent first molars and incisors are present, while the primary canines and molars usually remain.

• A. 6-1-2-3-4-5-7-8
• B. 6-1-2-4-5-3-7-8
• C. 1-6-2-3-5-4-7-8
• D. 6-1-2-4-3-5-7-8

Explanation: The usual mandibular permanent eruption sequence is first molar, central incisor, lateral incisor, canine, first premolar, second…

• A. It is too early to make final predication
• B. The teeth may develop later
• C. Primary second molar extracted to allow mesial drifting of permanent first molar
• D. The child may never develop premolars

Explanation: Calcification of the mandibular second premolar can be delayed and normally begins around the third year, so lack of a visible calcified…

• A. 1-6-2-3-4-7-5-8
• B. 2-3-1-6-7-5-4-8
• C. 6-1-2-4-3-5-7-8
• D. 6-1-2-3-4-5-7-8

Explanation: The common maxillary sequence is first molar, central incisor, lateral incisor, first premolar, second premolar, canine, second molar and…

• A. Before lateral incisor
• B. Before first molar
• C. After second molar
• D. After first molar

Explanation: Primary eruption generally proceeds through the incisors, first molars, canines and then second molars.