A Phase 3, Double-Blind, Randomized, Safety and Efficacy Study Comparing a Single Oral Dose of Ibuprofen (IBU) 250 mg/Acetaminophen (APAP) 500 mg (Administered as Two Tablets of IBU/APAP 125 mg/250 mg) to Each Active Drug Monocomponent Alone and to Placebo in the Treatment of Post-Surgical Dental Pain