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A potential side effect associated with bisphosphonates, a class of drugs used in the treatment of osteoporosis, Paget's disease and metastatic bone disease, is osteonecrosis of the jaw (ONJ). The incidence of ONJ in the general population is unknown; this rare condition also may occur in patients not receiving bisphosphonates. Case reports have discussed ONJ development in patients with multiple myeloma or metastatic breast cancer receiving bisphosphonates as palliation for bone metastases. These patients are also receiving chemotherapeutic agents that might impair the immune system and affect angiogenesis. The incidence or prevalence of ONJ in patients taking bisphosphonates for osteoporosis seems to be very rare. No causative relationship has been unequivocally demonstrated between ONJ and bisphosphonate therapy. A majority of ONJ occurs after tooth extraction. Furthermore, the underlying risk of developing ONJ may be increased in osteoporotic patients by comorbid diseases. Treatment for ONJ is generally conservative.

In light of recent reports of osteonecrosis of the jaw (ONJ) in cancer patients whose treatment regimens include an intravenous bisphosphonate, Novartis convened an international advisory board of experts in the fields of oral surgery and pathology, medical oncology, metabolic bone disease, and orthopedics to review existing data and provide updated recommendations on the clinical diagnosis, prevention, and management of ONJ in the oncology setting. Recommendations were developed to help guide healthcare professionals in early diagnosis and patient management. It is recommended that patients be encouraged to receive a dental examination prior to initiating bisphosphonate therapy and, if possible, complete any necessary dental procedures (e.g., tooth extraction) prior to initiating bisphosphonate therapy. Patients should receive regular dental visits during bisphosphonate therapy. Patients should be encouraged to practice good oral hygiene and minimize possible jaw trauma. If possible, patients should avoid dental surgery during treatment with bisphosphonates. If exposed bone is observed or reported in the oral cavity at any time (suspected ONJ), refer the patient to a dental professional immediately.

The first reports of osteonecrosis of the jaw in patients taking bisphosphonates to reduce excessive bone resorption were published in 2003. Subsequent reports raised concern and resulted in manufacturers writing letters of caution to physicians and dentists. Recommendations were issued by the US FDA, and the European Agency for the Evaluation of Medicinal Products requested that pharmaceutical companies update their product information and package leaflets. The European Society on Clinical and Economic Aspects of Osteoporosis and Osteoarthritis and the Foundation for Research on Osteoporosis and other Bone Diseases Working Group Meeting was convened on 14 December 2006 in Geneva, Switzerland, to review the available data and published guidelines on this rare but serious condition. The purpose of the meeting was to assess the impact of osteonecrosis of the jaw on the management of osteoporosis. The discussion focused on the current definition of osteonecrosis of the jaw, its epidemiology and pathophysiology, as well as identifying potential risk factors. Agreement was also reached on best practice in terms of diagnosis and management. [ABSTRACT FROM AUTHOR]