This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'Most common mechanism of failure of dental implants is \nSelect and explain. \nA. Alveolar crest resorption due to overloading, B. Periimplantitis due to infection, C. Implant fracture after loading, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]