<qa>  What is the term for preemptive analgesia?Central sensitization refers to persistent post-injury changes in the central nervous system resulting in greater pain sensitivity. The concept of preemptive analgesia is defined as a treatment that prevents establishment of central sensitization by providing analgesic coverage during the perioperative period of surgery. Previous acute pain studies using the oral surgery model have shown that suppression of postoperative pain, not intra-operative nociceptive barrage, diminishes the development of sensitization at 24 to 48 hours post-surgery. During the intermediate postoperative period, the nociceptive input from both surgical insult and inflammation leads to central sensitization, yet their relative contributions have not been clearly evaluated. The proposed study is designed to evaluate the relative impact of surgical insult and the subsequent inflammation on postoperative pain. The relative contribution of each of these nociceptive processes provides a basis for postoperative pain management and the development of preemptive strategies. 