Osteonecrosis of the jaws (ONJ) is an important possible late adverse effect of bisphosphonates. Serum C-terminal cross-linking telopeptide of type I collagen (CTX) can determine bone turnover and can act as a biological marker of bone resorption. We studied this biological marker in 15 patients (Group 1) with bisphosphonate-induced ONJ comparing with a control group of 10 healthy people matched by age and gender. We found no statistically significant relationships in Group 1 either between the serum CTX and the number of areas of exposed bone nor with the size of the osteonecrotic area.

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