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Volume 15 , Issue 2
March/April 2000

Pages 239246

Passivity of Fit and Marginal Opening in Screw- or Cement-Retained Implant Fixed Partial Denture Designs

David L. Guichet, DDS, Angelo A. Caputo, PhD, Hyeonju Choi, DMD, John A. Sorensen, DMD, PhD

PMID: 10795456

The relationship of stress generation upon placement of cement-retained or screw-retained implant restorations has not been thoroughly investigated. Passivity of fit and marginal discrepancies of screw- and cement-retained implant fixed partial denture (FPD) designs were determined using a photoelastic model of a partially edentulous posterior mandibular arch with 3 screw-type implants. Buccal and lingual marginal openings, measured with a traveling microscope before cementation or screw tightening, revealed no statistical difference in adaptation between designs. Screw tightening caused a reduction in marginal opening (changes significant, P < .05). The opening with the cemented FPDs was similar before and after cementation. Photoelastic evaluation of the FPDs showed that cement-retained FPDs exhibited a more equitable stress distribution than did their screw-retained counterparts. (INT J ORAL MAXILLOFAC IMPLANTS 2000;15:239246) Key words: cement-retained, custom abutment, implant biomechanics, implant prosthesis, loading, passive fit, screw-retained, telescopic crown

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