Design Requirements of Occlusal Rims

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Design Requirements of Occlusal Rims
Occlusal rims hold the teeth in place while the dentist prepares a set of dentures for use. (Prothese image by Andreas P. from

Full and partial denture sets provide needed teeth in place of missing ones. Dentists and dental assistants make denture sets for patients by hand. Occlusal rims are the wax structures in which denture teeth are set during production of a set of dentures. The occlusal rims provide dental technicians with a working model to perfect how the teeth touch together when the patient's jaw is closed.

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Occlusal rims are built on a plastic or silicone base model. These bases are generally prefabricated, but can be handmade by the dental technician. The bases must be rigid and stable to secure accurate placement of teeth. They must also be able to prevent the working model, including the occlusal rim, from bending during denture production.

Lip Support

The occlusal rim must be tested on the patient to ensure correct lip support. Rims that are too pronounced in the anterior of the mouth will protrude from the lips. Rims that do not significantly support the lips will result in facial distortion around the patient's mouth.

Tongue Space

The buccolingual width of the occlusal rims must allow the tongue to freely move inside of the mouth during denture wear. The correct buccolingual width will support the soft-facial tissue on the inside of the patient's cheeks, as well as support the stability of the dentures during use.

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