What is a SPLIT thickness pouch graft used for ridge augmentation?
a. SPLIT thickness pouch graft is used for ridge augmentation to increase the width and height of the alveolar ridge for implant placement
b. SPLIT thickness pouch graft is used for ridge augmentation to stabilize dentures in edentulous patients
c. SPLIT thickness pouch graft is used for ridge augmentation to treat gum recession and root exposure
d. SPLIT thickness pouch graft is used for ridge augmentation to improve the aesthetics of the smile and facial appearance