You can attempt to recreate deleted objects if their tombstone lifetimes have passed and the objects have been purged from the Active Directory Deleted Objects container.
However, you should be aware of the following:
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Most applications will not recognize a recreated object since recreated objects are not identical to the original deleted object. Recreated objects are assigned new global unique identifiers (GUIDs) and security identifiers (SIDs) that cannot be identified by the applications that created the original object.
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Attributes created by the Windows operating system cannot be recreated when a purged object is recreated. Hence, objects that rely on attributes set by the operating system will not be recognized by Windows when the objects are recreated.
More Information
Recreating purged Active Directory objects
Recreating purged ADAM/AD LDS objects
About restoring individual Active Directory and ADAM/AD LDS objects