hello and welcome to hcm forum,
i would like to inform you that as they x-ray of both the teeth were fine, therefore the problem lies within the interdental space(space between those two restored teeth), what i can recommend is keep your teeth free from food debris because ,moment food lodgement occurs ,their would be inflammation in the gums and pain.
i would suggest, continue doing antibacterial rinses(betadine
), avoid flossing that area too much,
rinse your mouth with plain water after every meal,
also, use topical gel(metrohex) ,apply with finger, leave it for half an hour(3-4 times/day),
do not worry inflammation will resolve soon,
i wish you good health,