A reline jig is a device used in dentistry to assist in the process of relining dentures. Over time, as the shape of the gums and bone changes, the denture may become loose and uncomfortable to wear. Relining involves adding new material to the underside of the denture to improve its fit and stability. A reline jig is a custom-made device that fits over the existing denture and provides a stable platform for the dentist or dental technician to apply the new denture material. It allows for precise application of the material and ensures that the denture is held securely in place during the relining process. The reline jig can be made of various materials, such as acrylic resin or metal, and is typically designed to fit a specific patient's denture.