Analgesic efficacy and tolerability of oxycodone 5 mg/ibuprofen400 mg compared with those of oxycodone 5 mg/acetaminophen 325 mg and hydrocodone 7.5 mg/acetaminophen 500 mg in patients with moderate to severe postoperative pain: A randomized, double-blind, placebo-controlled, single-dose, parallel-group study in a dental pain model