Hi Mary, thanks for your question.  Have you discussed your CTx score with the oral surgeon?  The surgeon would know if these scores are right to go ahead with the implant.  Some implant specialist feel that a CTx should be at or above 150 to proceed with an implant, but this is usually after someone has been on a bisphosphonate (Actonel) for several years.  If you have periodontal disease, and are taking Actonel, sometimes they will have you stop the medication for some time and recheck your CTx to see where it is while on a drug holiday.  A score of 100-150 would mean you are at moderate risk, but this depends on your *existing* dental/jaw bone health.

Here's an article from the Osseo News with more info on CTx.  Osteonecrosis is fairly rare so I wouldn't worry about it unless you've had some jaw bone injury or severe periodontal disease.  A small number of people can get this from oral bisphosphonate use, but the majority of those who contract it are from the IV cancer dose which is much larger and more frequent than the oral medication is administered for osteoporosis.  I'm not saying that this can't happen, but the stats are low for the oral dose of bisphosphonates especially if you haven't taken it for that long of a time (6 months).  Here's another article from the same place (Osseo News) that has a slightly different spin on C-Telopeptide scores.

Good luck and ask your Surgeon what he/she thinks.  Also did you have a baseline test done prior to this last one of 68, and was it better or worse?  If you have any other questions don't hesitate to ask.