Attachments or locks. This fixation method is not often used when installing removable dentures, but it is often used when installing fixed structures. Attachments can be used for partial edentulism when there are no more than two teeth in the patient’s mouth. The patrix or fitting part of the attachment can be located in the root or crown part of the abutment tooth.
Clasps and hooks. This type of fitting is used mainly for removable prosthetics, and the fixing devices and the dentures are made of similar material. Acrylic, polyurethane, and nylon dentures have fixation devices, while removable clasp dentures are equipped with metal hooks.
Suction cup or flexible dentures. This method of attachment is used when installing a complete denture or overdenture. The attachment mechanism of such devices is based on the adhesion or natural vacuum effect of suction.
Implants. Removable implant-retained dentures can be fixed by a bar or ball attachment.