Osteonecrosis has been responsible for the ejection/rejection/loosening of previously-well-integrated dental implants as bone recedes around the implant. I'm not saying that that's true in your case, of course, but, having two dental implants and a complicated oral/dental history, the osteonecrosis possibility was one that was foremost in my mind when considering any treatment for osteopenia. As was the risk of longitudinal femur fracturing from bisphosphonates. I'm keeping an eye on diet and exercise and hoping that future DEXA continues to show no change or maybe even some improvement.