A 2-year-old child has suffered a teeth trauma. Objectively: the crowns of the 51 and 61 teeth are by 1/3 shorter than the others. Mucosa in the area of the 51 and 61 is hyperemic, swollen. X-ray reveals absence of the periodontal fissure in the root apex areas of the 51 and 61. What treatment tactics would be optimal?