Influence of Load on Retention during Placement of a Magnetic Attachment in an Overdenture

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Purpose: The purpose of the present research was to clarify the influence of load on the retention of the overdenture when placing a magnetic attachment. Materials and Methods: A mandibular model with a root only in the left canine was fabricated. A root coping containing the keeper of a magnetic attachment was placed on the left canine. The thickness of the simulated mucosa in the residual ridge was 2mm. The mucosa was fabricated using a fitness test material. A magnet was placed on the keeper and then embedded in the denture base with quick self-curing acrylic resin. A load ranging from 4.9 to 29.4 N was applied to the occlusal surface of the denture. Results: When loads of 26.4 or 29.4 N were applied, the attractive force of the overdenture was less than 10 N (p<0.01), which is significantly smaller than the attractive force obtained when a load of less than 23.5 N was used. These results are probably due to the rebound of the residual ridge membrane. Conclusion: Although sufficient attractive force was obtained when a magnetic attachment was placed in the mouth and a small load was applied to the denture, the attractive force of the magnetic attachment may not be great enough under large loads, such as occlusal force. Care should be taken regarding the amount of load applied to the occlusal surface of the overdenture when placing magnetic attachments.
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