If the pain is there in the wisdom tooth you can not go for the crown with out getting the root canal treatment as it looks like the wisdom tooth is already infected. If you put the crown with out the root canal treatment it will start painning and you have to get the root canal treatment done eventually. If you decide for puling it out then you have to get the upper one also pulled out. so in my opinion if the tooth can be saved with root canal treatment then go for the root canal treatment and then the crown above that. For more info on root canal treatment you can visit the following link on our web site.......http://www.identalhub.com/articlecategory-root-canal-therapy-17.aspx