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To ensure the trouble-free and long lasting function of the attachments, stability of the removable denture is of the utmost importance.
- Bredent attachments require a circumferential shoulder with a groove on the abutment crown bearing the patrix. It is recommended for this shoulder and groove to be incorporated in the waxing stage using a milling machine or a surveyor. The shoulder rest with groove will receive a lingual arm coming from the partial.
- The lingual arm and shoulder rest seat with a groove prevent displacement of the appliance and keeps attachments free of stress by diverting shear forces down the long axis of the abutment tooth.
- The lingual arm is not retentive, it only provides stability, stress distribution and guidance for patients to insert and remove the prosthesis.
- Failure to provide the lingual arm and rest seat with a groove can result in the patrix (male) breaking completely off of the crown or wear prematurely due to the prosthesis displacing frequently.
