What is the usual time of eruption of first two lower central incisors?

Appeared in: UPPSC-2021

Explanation

The first primary teeth to erupt in an infant are the lower central incisors.
The typical age for this developmental milestone is between 6 and 8 months, which aligns with the information from pediatric textbooks.
This event marks the beginning of the primary dentition period, which involves the eruption of 20 teeth in total.
The full set of primary teeth is generally complete by 3 years of age.

Option A: This timeframe is too early for the normal eruption of primary teeth. Eruption at this age is considered atypical.
Option C: This is too late for the first teeth. By 10-12 months, the lower central incisors have usually been present for several months, and the upper incisors are typically erupting.
Option D: This timeframe is significantly later than the eruption of the first incisors. It corresponds to the eruption of molars and canines.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Eruption timeline of primary (deciduous) teeth as background academic context rather than a clinical decision trigger.
Nurses play a key role in educating parents about the signs of teething (e.g., drooling, irritability, gum swelling) and providing guidance on comfort measures like chilled teething rings or gentle gum massage.
It is critical to teach caregivers that while mild fussiness and a low-grade temperature can accompany teething, a high fever (above 100.4°F or 38°C) is not a sign of teething and indicates an underlying illness that requires medical attention.
What if? If an infant has not erupted any teeth by 18 months of age, this is considered delayed eruption. The nurse should advise the parents to consult a pediatrician or pediatric dentist to rule out nutritional deficiencies, endocrine disorders (like hypothyroidism), or other systemic conditions.

How to Approach the Question

First, identify the specific developmental milestone the question is asking about: the eruption of the 'first two lower central incisors'.
Recognize this as a question of factual recall related to pediatric growth and development.
Recall the standard timeline for teething. The first teeth are known to appear at approximately 6 months of age.
Scan the options to find the one that includes this timeframe.
The option '6 to 8 months' is the most accurate and standard range for this event.
Eliminate the other options by reasoning they are either too early (2-3 months) or too late (10-12 months for first teeth, 1-2 years for molars/canines).

Concept Tested & Keywords

QDo5ZI5-5J755hb07goIPm

E6 Anatomy Grays 43e Vol 2 Part 1 p. 90-92

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 16-18

Practise the full UPPSC-2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.