What term indicates the curvature of the nail that can appear due to changes in its matrix?

The term that indicates the curvature of the nail due to changes in its matrix is "pincer nail." This condition is characterized by the nail plate becoming excessively curved, often resembling a claw shape, which can result from a variety of factors, including genetic predisposition or nail trauma that affects the matrix, the tissue beneath the nail that produces the nail plate.

Understanding the importance of the nail matrix is key here; when the matrix is compromised or altered, it can lead to changes in how the nail grows, manifesting as abnormal curvature. In contrast to other conditions, like trumpet nails, which refer to a specific deformity where the sides of the nail grow more concavely than the center, or onychorrhexis, which involves split or brittle nails, pincer nails specifically relate to a modification in curvature that stems from matrix changes. Onychomycosis, a fungal infection of the nails, affects the overall health and appearance of the nails but does not directly relate to the curvature caused by matrix alteration.