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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
January/February 2002
Volume 15 , Issue 1

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Changes in Prosthetic Screw Stability Because of Misfit of Implant-Supported Prostheses

Lulwa Ebrahim E. Al-Turki, BDS, MS, John Chai, BDS, MS, MJ, DLaw, Eugene P. Lautenschlager, PhD, Mark C. Hutten, DDS, MS

Pages: 38–42
PMID: 11887597

Purpose: The effect of two levels of prosthesis misfit on prosthetic screw stability was evaluated. Materials and Methods: Two levels of vertical discrepancies—100 and 175 µm—were introduced between an implant-supported complete denture and the terminal abutment. An implant-supported complete denture without vertical discrepancy served as a control. Cyclic load was delivered vertically on the cantilever portion of the prosthesis next to the terminal abutment for 48 hours for each trial. A total of seven sets of new screws were tested for each level of fit. Results: The results revealed significant prosthetic screw instability at both the 100- and 175-µm levels of discrepancy. Conclusion: Vertical discrepancies of 100 and 175 µm introduced between an implant-supported fixed complete denture and the terminal abutment resulted in significant prosthetic screw instability. Int J Prosthodont 2002;15:38–42.

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