<prompt> Most common mechanism of failure of dental implants isAlveolar crest resorption due to overloadingPeriimplantitis due to infectionImplant fracture after loadingNone of the above  <response>: The most common failure mechanism is alveolar crest resorption due to overloading. This inevitably leads to progressive periodontal lesions, decreased areas of supporting tissues, and ultimately to implant loosening. Aseptic failures are most often the cumu- lative result of more than one of the aforementioned factors. 