Temporary dentition usually starts at which year of age ?
**Core Concept**
Temporary dentition, also known as deciduous dentition, is a stage of tooth development in humans. It is characterized by the eruption of 20 primary teeth, which begin to appear in the mouth when the child is around 6 months old and continue to erupt until they are 3 years old.
**Why the Correct Answer is Right**
The correct answer indicates the average age range when temporary dentition starts. This is typically around 6 months after birth, when the first primary tooth begins to erupt. The mechanism behind this is the gradual eruption of primary teeth due to the resorption of the primary tooth buds. The primary teeth are smaller and whiter than permanent teeth and start to erupt in the lower front teeth, followed by the upper front teeth.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as temporary dentition starts before 1 year of age, not after.
**Option B:** This option is incorrect as temporary dentition starts before 2 years of age, not exactly at 2 years.
**Option C:** This option is incorrect as temporary dentition starts before 3 years of age, not exactly at 3 years.
**Clinical Pearl / High-Yield Fact**
It's essential to note that the eruption time of primary teeth can vary significantly among individuals. The American Academy of Pediatric Dentistry recommends a child's first dental visit by their first birthday to monitor the eruption of primary teeth.
**Correct Answer: C. 6 months to 1 year of age.**