Hello, Sadly bungie cannot replace accidentally dismantled items. The following services cannot be provided: Recovery of dismantled items Reset character features Transfer of items between platform accounts Reset or refund weapon and armor upgrades Refund currencies on accidental purchases Revert Exotic Bounty choices Refund materials on accidental reforged weapons Restore deleted characters The choices you make in Destiny are often permanent. Please be careful when you perform any of the above actions. http://www.bungie.net/en/Help/Article/12211

Nope can't get it back you will have to switch between characters. Bungie don't return nothing once it dismental