If the crown part is lost and root is still insde you can go to the dentist who after doing the clinical examination and taking the X-ray will assesss the condition of the root . If it is healthy then after doing the root canal treatment you can go for post and core. In this the support is taken from inside the root and you do not have to worry about getting any surgical procedure. But this can be done only if the root is healthy. For more info on post and core you can visit the following link....www.identalhub.com/article_what-is-post-and-core-280.aspx