Translational research on clinically failed zirconia implants.

摘要: Abstract Objectives To provide fractographic analysis of clinically fractured zirconia implants recovered with their cemented crown. calculate bending moments, corresponding stress and crack onset location on the implant’s fracture surface using a mathematical model integrating spatial coordinates crown-implant part occlusal loading obtained from 2D 3D images. Methods 15 parts (11 posterior 4 anterior) all- ceramic crowns still it were recovered. The first generations four manufacturers (AXIS Biodental, Z-Systems, Straumann, Swiss Dental Solutions). time-to-failure varied between 2 weeks 9 years. Fractography was performed identifying failure origin characteristic features. From digital images part, anchoring crown’s contacts central axis reference plane integrated in spreadsheet. Loads 500 N total selectively distributed over identified wear patterns. resultant torsion shear, tensile, maximum principal von Mises calculated. given by an angular position respect to compared analysis. Results Implants periphery smaller inner diameter two threads at bone-entrance level except for one implant which failed half-way within bone. porous coating Biodental) large grit alumina sandblasting (Z-System) created defects directly related origin. spreadsheet showed how affects moments onset. Dominant loads important pattern provided calculated good agreement findings Significance Recovered broken restorative can not only information regarding fractography but also knowledge crown axis. helpful showing initiation site clinical cases.