Fifty patients participated in this controlled double-blind study. The results showed that, when compared with a placebo, injection of the steroid (dexamethasone, 4 mg) significantly reduced both the incidence and severity of pain at 4 h posttreatment and reduced pain at 24 h posttreatment. Other patient and treatment factors such as age, sex, tooth number, pulp and periapical status, and number of appointments had no effect on posttreatment pain. However, posttreatment pain did correlate with the presence of pretreatment pain in both incidence and severity.
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