| 3081 Mandibular Implant Overdentures Load Transfer with Magnetic and Resilient Attachments | ||
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S. HOJO1, K. OCHIAI2, S. SADOWSKY3, M. TOYODA4, and A.A. CAPUTO2, 1Kanagawa Dental College, Yokosuka, Kanagawa, Japan, 2UCLA School of Dentistry, Los Angeles, CA, USA, 3UCLA school of Dentistry, Los Angeles, CA, USA, 4Kanagawa Dental College, Japan Objectives: A prior study evaluated the load transfer characteristics of four implant splinted and unsplinted mandibular overdenture designs. Comparative load transfer effects of different magnets or conventional mechanical retention attachments for an unsplinted two implant overdenture have not been investigated. The purpose of this study was to compare the load transfer characteristics of two implant mandibular overdentures with four different unsplinted attachments. Methods: A photoelastic model of an edentulous mandible was fabricated with two 3.75 x 13 mm screw type implants (3i Osseotite, Palm Beach Gardens, FL) in the canine areas. Four dentures were identically fabricated using clear heat cured denture resin. Four attachment designs were incorporated: Dome magnet (MAGFIT-IP-3i-D, Aichi Steel Corp.; Japan), Flat magnet (MAGFIT-IP-3i-F, Aichi Steel Corp), Locator (Zest Anchors, Escondido, CA), ERA (Sterngold Attachments; Attleboro, MA). Simulated occlusal loads applied were: a) bilateral equal loads on first molars, b) bilateral unequal loads on first molars c) unilateral load on left first molar, d) anterior at central incisors. The resulting stresses were photographed in the field of a circular polariscope. Results: Load transfer to the mucosal support areas was observed for all loadings of the tested designs. Equal bilateral loading generated the highest stress in the posterior simulated mucosal support areas for the dome and flat magnet attachments, followed by the Locator then ERA attachments. Similar observations were made for the unequal bilateral loads. Unilateral molar loads produced minimal differences between the attachment designs. Dentures were unstable for all designs under the anterior loading condition. Conclusions: For the unsplinted two implant supported overdenture designs evaluated, there were slight differences in load transfer between the implant and soft tissue supporting areas with the magnet and resilient attachments. Results suggest that criteria, such as the specific retention requirements of the patient, may play a major role in attachment selection. | ||
| Seq #333 - Implant Prosthodontic Research 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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