What is the name of the natural nail extension method that uses a form?

Sculpted nails refer specifically to the technique of creating nail extensions using a form that is placed under the natural nail. This method allows the nail technician to shape the extension to the desired length and contour, using products like acrylic or gel to build up the structure of the nail. The use of a form provides greater control over the shape and allows for a more customized look, as opposed to pre-made tips which are glued onto the natural nail.

In contrast, tips are artificial nail pieces that are pre-shaped and glued onto the natural nail. Acrylic nails refer to a broader category of nails that can utilize forms or tips, but they do not specify the application method. Wraps are a technique that involves adhering materials like fiberglass or silk to strengthen the natural nail but do not involve the creation of an extension using a form. Therefore, the definition and technique of sculpted nails specifically align with the use of a form, making it the most accurate answer for the question asked.