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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Sometimes the anatomical shape of the alveolar ridge will not allow the surgeon to position the implants with the bar parallel to the hinge axis. In this situation, the lab technician and restorative doctor can modify the bar design to achieve this goal. (Figs. 13B, 13C, on P. 20) The Anterior-Posterior Distance Rule The Anterior-posterior Distance Rule is good for determining the distal cantilever extension of the bar or distal extension of the hybrid (fixed detachable) prosthesis from the most posterior implants. (Fig. 14) • Draw a line through the center of the most posterior implants on each side of the arch. • Draw another line through the center of the most anterior implants on each side of the arch. • The distance between these two lines is the anterior-posterior spread (A-P distance). • Generally, the distal cantilever should not exceed one and a half times |
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