Socket Preservation vs. Ridge Augmentation

What's the difference between socket preservation and ridge augmentation? Is socket preservation preferred for a lower molar and ridge augmentation for an upper molar?

[scottma]

Socket preservation is commonly performed immediately after tooth extraction, which is a very procedure. Ridge augmentation is performed is the edentulous area to increase the width and/or height of alveolar bone.ridge augmentation is highly technique sensitive.if you need implant therapy, seeing a qualified dentist is advised.

[merrymarietta]

I'm not sure I understand your comment, "Ridge augmentation is highly technique sensitive." How does this procedure differ from socket preservation? Why would it be used instead of socket preservation?