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Volume 10 , Issue 3
May/June 1995

Pages 326-334

Bending Overload and Implant Fracture: A Retrospective Clinical Analysis

Bo Rangert, Mech Eng, PhD/Paul H. J. Krogh, DDS, MSD/Burton Langer, DMD, MScD/Ned Van Roekel, DDS, MSD

PMID: 7615329

Thirty-nine patients with implant fractures treated by three of the authors have been analyzed as to probable causes. Thirty-five (90%) of the fractures occurred in the posterior region. Thirty (77%) of the prostheses were supported by one or two implants, which were exposed to a combination of cantilever load magnification and bruxism or heavy occlusal forces. It was concluded that prostheses supported by one or two implants and replacing missing posterior teeth are subjected to an increased risk of bending overload. The literature review indicates that the fracture frequency is low in these situations and this study demonstrates that with appropriate treatment planning, such overload situations can essentially be prevented. (INT J ORAL MAXILLOFAC IMPLANTS 1995;10:326334)

Key words: bending overload, bone resorption, implant fracture, mechanical problems, osseointegrated implant

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