Prostaglandins and bone: potential risks and benefits related to the use of nonsteroidal anti-inflammatory drugs in clinical dentistry.

In the skeleton, prostaglandins, mainly PGE(2) produced by osteoblasts under COX-2 stimulation, play either a stimulatory or an inhibitory role in bone metabolism, depending on the physiological or pathological conditions. The anabolic effect occurs largely in response to mechanical forces and in bone fracture healing, whereas PGE(2)-mediated resorption contributes significantly to bone loss in inflammatory diseases and in response to prolonged immobilization. Many reports have shown that conventional nonsteroidal anti-inflammatory drugs (NSAIDs) may delay fracture healing and negatively interfere with spinal fusion in both humans and other animals, whereas the alleged inhibitory effects of COX-2-selective NSAIDs still lacks experimental and clinical evidence.