Hi
You may check that whether a new content database has been created in SQL server. If so, you can resort to following Stsadm command line tools to solve this problem.
Stsadm –o addcontentdb –url <url> -databasename <database name>
If no new content database has been built, things will be different. I need more details to help you out.
1.Are you doing a restore for a site collection, a specific web application or a server farm?
2.What are your backup and recovery tools?
Best Regards!