Manufacturing defects/deformation - no defects identified as a result of the manufacturing process.No deformations or damages identified as a result of the manufacturing process.End user physical damage - the abutment was overcast so that casting material flowed over the implant connection collar.This was attempted to be resolved by grinding the material away, which a) they did not get all of it so there was still over casted material on the implant connection collar and b) they grinded away portions of the implant connection collar investigation results and conclusions - the implant connection collar on the abutment has been damaged during the processing of the final restoration.Overcasting and grinding changes the dimensions and geometry of the specifically designed implant conical connection between the abutment and the implant so that there is no longer a uniform connection around the abutment/implant junction.Because there is no longer a uniform connection, forces will cause the abutment to rock in the junction and apply forces to the hex.The hex is designed to be passive.So, when acted on by the forces caused by the rocking of the abutment, the hex failed and fractured.There should never be overcasting past the collar of the abutment.There should never be grinding of the collar of the abutment.Failure caused by improper technique or improper use of product.
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