Thanks for posting your query.
As per the details provided,you were wearing splint
to prevent grinding of teeth.
This has lead into jaw deterioration due to imbalanced occlusion or biting.
I would suggest you to use either side of the jaws equally/simultaneously,without applying pressure on a single side.
If required,the splint has to be removed.
You can also try jaw movement exercises.
avoid too much of wide mouth opening.
hope this helps.