Int J Oral Maxillofac Implants 15 (2000), No. 2 15. Apr. 2000
Int J Oral Maxillofac Implants 15 (2000), No. 2 (15.04.2000)
Passivity of Fit and Marginal Opening in Screw- or Cement-Retained Implant Fixed Partial Denture Designs
Guichet, David L. / Caputo, Angelo A. / Choi, Hyeonju / Sorensen, John A.
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.
Keywords: cement-retained, custom abutment, implant biomechanics, implant prosthesis, loading, passive fit, screw-retained, telescopic crown