A 3-year-old girl complains about pain and tumescence in the region of the decayed 51, 52 teeth, body temperature rise up to 37,5 — 37,9°C. Objectively: the face is asymmetric because of a tumescence in the upper lip region and right infraorbital region. The crown of the 51 tooth is completely decayed. Mucous membrane in the region of the 52, 51, 1 teeth is edematic, mucogingival fold is smoothed, palpation provokes pain, mobility of I-II-degree of the 51,52 teeth is also present. What is the most likely diagnosis?