The first incisors to erupt in an infant: UPSC 07
**Core Concept**
The eruption of primary teeth in infants is a significant milestone in oral development. The sequence and timing of tooth eruption are influenced by various factors, including genetics and environmental conditions. The eruption of primary teeth is a complex process involving the coordinated action of multiple cell types and tissues.
**Why the Correct Answer is Right**
The first incisors to erupt in an infant are the central incisors, specifically the maxillary central incisors. This is due to the early development and maturation of the dental lamina, a layer of epithelial cells that gives rise to the teeth. The maxillary central incisors are among the primary teeth that erupt between 6 to 12 months of age, marking the beginning of the primary dentition.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the eruption of the mandibular central incisors typically occurs after the maxillary central incisors. The mandibular central incisors usually erupt between 8 to 12 months of age.
* **Option B:** This option is incorrect because the eruption of the maxillary lateral incisors occurs after the central incisors. The maxillary lateral incisors typically erupt between 9 to 16 months of age.
* **Option C:** This option is incorrect because the eruption of the primary canines occurs later in the primary dentition. The primary canines typically erupt between 12 to 16 months of age.
* **Option D:** This option is incorrect because the eruption of the primary molars occurs in the second year of life. The primary molars typically erupt between 12 to 30 months of age.
**Clinical Pearl / High-Yield Fact**
The eruption of primary teeth is a dynamic process influenced by various factors, including genetics, nutrition, and environmental conditions. A child's dental development should be closely monitored to identify any potential issues or abnormalities.
**Correct Answer:** A.