A patient presents with anterior crowding as a result of large size of teeth in comparison to the base of mandible. This will be classified as:

 # A patient presents with anterior crowding as a result of large size of teeth in comparison to the base of mandible. This will be classified as: (AIIMS PG 2020)

A. Primary Crowding

B. Secondary Crowding

C. Tertiary crowding

D. Third degree crowding

The correct answer is A. Primary Crowding.

Explanation:

Primary Crowding refers to crowding that arises due to a disproportion between the size of the teeth and the size of the jawbones. In this case, the patient has large teeth relative to a smaller mandible, leading to anterior crowding. This is often genetic in origin and present even before all permanent teeth have erupted.

Secondary Crowding typically develops later, often due to factors like premature loss of primary teeth, leading to mesial migration of posterior teeth and a reduction in arch length for the erupting permanent teeth.

Tertiary Crowding (also known as late adult crowding) usually occurs in late adolescence or early adulthood, often involving the lower anterior teeth, and its exact etiology is multifactorial but can involve late mandibular growth, mesial drift, and eruption of third molars.

Third-degree crowding is not a standard classification of crowding etiology; rather, crowding is often quantified as mild, moderate, or severe, sometimes with degrees (e.g., in millimeters of discrepancy), but not as "first, second, or third degree" in terms of cause.