The screw is pressed and rotated by the toothed template (toothed plate). Make its surface form tooth lines in the dental mold. This method is usually called dental reconstruction. Making screws needs to be divided into two parts: heading and screwing.

Screw is a tool to tighten instruments and parts step by step by using the physical and mathematical principles of circular rotation and friction of the inclined plane of an object. Screw is a general term for fasteners. Screws are indispensable industrial necessities in daily life, such as tiny screws used in cameras, glasses, clocks and watches, electronic products, etc. Universal screws for TV sets, electrical products, musical instruments, furniture, etc. As for projects, buildings and bridges, large screws and nuts are used; Transportation equipment, airplanes, trams, cars, etc. There are both large and small screws.