Fig 5.
Effect of masticatory muscle inflammation on gnaw time. CFA was injected bilaterally into the masseter muscle of mice and their gnaw time was compared to control saline-injected mice and indomethacin-pretreated mice receiving CFA injection into the masseter muscle. Gnaw time was significantly increased 10 hours post-CFA injection (white circles, n=4) compared to saline injection (black squares, n=4) into the masseter muscles (*P<0.05, Mann-Whitney U Test). Indomethacin pretreatment (5mg/kg intraperitoneal) 30 minutes prior to CFA injection (black circles, n=5) into the masseter muscles completely blocked CFA effects on gnaw time increase (*P<0.05, Mann-Whitney U Test).