Pediatric Dentistry · patient case question
At what age does calcification of the permanent second molars typically begin?
Patient case: A young patient in the mixed dentition
demo: 5-year-old female
chief: Routine examination. Her mother is worried that her front teeth are coming through early.
history: Healthy. The family moved recently from a community with fluoridated water to one with none. Her mother reports the older sibling had a similar early pattern.
meds: None.
findings: Both mandibular permanent central incisors are fully erupted. A 3 mm midline diastema is present in the maxilla between the primary central incisors. A periapical film of a maxillary lateral incisor shows an invagination of enamel and dentin extending into the pulp chamber.
Show answer and explanation
Correct answer: B. Around 3 years
- A. First permanent molars begin calcifying at birth, which is why they record perinatal disturbances.
- B. Correct. Permanent second molars begin calcifying at roughly 2.5 to 3 years, crown completion follows at 7 to 8 years, and eruption occurs at 11 to 13. Knowing initiation timings matters when interpreting enamel defects, because the insult can be dated to the period of crown formation.
- C. By 8 years the crown of the second molar is already complete or nearly so.
- D. By 12 years the second molar is erupting, well past the start of calcification.
Note: The recall author was uncertain between 3 and 8 years. Three years is correct for the start of calcification; 8 is approximately when the crown is complete.
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