Principles of Attachment Selection for Implant Supported Overdentures
| Principles of Attachment Selection for Implant Supported Overdentures | Hamid Shafie, DDS* and George Obeid, DDS** |
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divergence of up to 20° each for a total of 40° between implants. (Fig. 2F) Rigorous cyclic testing showed significant retention up to 60,000 insertion/removals at this degree of divergence.27
Resilient Function An important element in attachment design is resiliency. Resiliency allows movement between the implants and the restoration, transferring stress from the implants to the tissue bearing areas. The pivoting feature, combined with the use of the black processing insert, provides rotational and vertical resilient function to minimize stress transferred to the implants. (Fig. 3A on P. 6) Vertical Space A critical consideration when case planning an attachment restoration is vertical space. Adequate space is required to allow room for the attachment and the acrylic/denture tooth over the assembled complete attachment. Selection of an attachment with excessive height can result in a restoration that is over-contoured or has a thin, weak area subject to breakage. The Locator® was designed to have a lower vertical profile compared to other existing attachments. (Fig. 3B on P. 6) The Locator® metal housing with nylon male inset requires only 2.27 mm above the tissue. The female abutment is only required to extend 1.5 mm above the tissue for the male element to seat without impinging on the tissue. (Fig. 3C onP. 6) |
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Volume 19.6 |