Celebrex for Pain Relief After Oral Surgery

Facial Pain

Celecoxib, Thromboxane B2, Prostaglandin E2, Microdialysis, Ibuprofen

This study will evaluate the effects of the new anti-inflammatory drug, Celebrex, on relieving pain after oral surgery. It is also designed to assess the drug's selective inhibition of a chemical called cyclooxygenase-2 and not its closely related form, cyclooxygenase-1. This selective inhibition allows pain alleviation without the adverse side effects (e.g., bleeding and stomach upset) often associated with anti-inflammatory drugs. Healthy volunteers who require removal of their third molars are eligible for this study. Participants will have oral surgery for tooth extraction after receiving a local anesthetic (lidocaine) in the mouth and a sedative (midazolam) through an arm vein. On the evening before and 1 hour before surgery, patients will be given a dose of either the standard anti-inflammatory drug ibuprofen (Advil, Nuprin, Motrin), or Celebrex, or a placebo (a pill with no active ingredient). After surgery, a small piece of tubing will be placed in each extraction site and tied to an adjacent tooth to hold it in place. Samples will be collected from the tubing to measure chemicals involved in pain and inflammation. Patients will stay in the clinic for up to 6 hours after surgery while the anesthetic wears off and will complete pain questionnaires. During that time, they may receive acetaminophen plus codeine (Tylenol 3), if needed, for pain. The tubing then will be removed and the patient discharged with standard pain medication.

Prostanoids are mediators that have been implicated in all stages of inflammation. The inhibition of prostanoid synthesis by NSAIDs forms the basis of their therapeutic as well as side effects. NSAIDs directly inhibit cyclooxygenase \[COX\], which leads to reduction of prostaglandin synthesis and also to gastric erosions, inhibition of platelet aggregation and nephrotoxicity. The identification of the two isoforms of COX lead to the hypothesis that COX-2 is responsible for the production of prostaglandins following tissue injury, while COX-1 is involved in normal homeostasis. The selective COX-2 inhibitors are believed to be efficacious anti-inflammatory drugs devoid of the side effects associated with the inhibition of COX-1. However, the selectivity of these drugs has only been demonstrated in vitro and ex vivo, which may not be a reliable indicator of the in vivo selectivity. The proposed study aims to evaluate the in vivo selectivity of celecoxib, a drug demonstrated to be a selective inhibitor of COX-2 in vitro in the oral surgery model of acute inflammation.

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United States