Clinical management and microscopic characterisation of fatigue-induced failure of a dental implant. Case report.
BACKGROUND
Osseointegrated endosseous implants are widely used for the rehabilitation of completely and partially edentulous patients, being the final prosthodontic treatment more predictable and the failures extremely infrequent. A case of fracture of an endosseous dental implant, replacing the maxillary first molar, occurring in a middle-age woman, 5 years after placement is reported.


METHODS
The difficult management of this rare complication of implant dentistry together with the following rehabilitation is described. Additionally, the authors performed an accurate analysis of the removed fractured implant both by the stereomicroscope and by the confocal laser scanning microscope.


CONCLUSIONS
The fractured implant showed the typical signs of a fatigue-induced fracture in the coronal portion of the implant together with numerous micro-fractures in the apical one. Three dimensional imaging performed by confocal laser scanning microscope led easily to a diagnosis of "fatigue fracture" of the implant. The biomechanical mechanism of implant fractures when overstress of the implant components due to bending overload is discussed.


CONCLUSIONS
When a fatigue-induced fracture of an dental implant occurs in presence of bending overload, the whole implant suffers a deformation that is confirmed by the alterations (micro-fractures) of the implant observable also in the osseointegrated portion that is easily appraisable by the use of stereomicroscope and confocal laser scanning microscope without preparation of the sample.
Capodiferro
S
S
Department of Dental Sciences and Surgery, University of Bari-Italy, Bari, Italy. saveriocapodiferro@libero.it
Favia
G
G
Scivetti
M
M
De Frenza
G
G
Grassi
R
R
D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D018613:Microscopy, Confocal; D008875:Middle Aged; D013499:Surface Properties
D015921:Dental Implants