Gum inflamed after cap and veneer. What do you think the cause could be? (Photo)

Four years ago I had a crown replaced and 3 veneers on my front 4 teeth. From day 1 the gum around the cap between the front two teeth has been inflamed and sore. The dentist removed the front cap and veneer and put on a one piece moulded until the acrylic temporarys were ready. Gum REALLY calmed down: the colour went back to pink and the size reduced within a week. The trouble, is he fitted the temporarys today and the gum is inflamed again. What do you think the cause could be? Losing hope.