Abstract: A dental implant instrument set for vertically displacing sinus mucosa to form a space for bone augmentation comprises a bone drill and a sinus curette. The bone drill includes a drill bit for drilling upwardly a hole at a site of the alveolar bone where a tooth is lost, so as to expose sinus mucosa. The sinus curette includes a holding portion and a curette head portion. The curette head portion has one end provided with a turning part for separating from the alveolar bone and displacing the exposed sinus mucosa inward through the hole drilled by the drill bit, so as to form a space for bone augmentation above the site of the alveolar bone where the tooth is lost. The turning part is arranged to be at a first angle between 45 to 135 degrees with the curette head portion.

Abstract: Permeable portions of a subterranean formation are temporarily plugged by driving a foam formed by interacting an aqueous surfactant solution and dense fluid carbon dioxide into the permeable portions of the formation. In an embodiment of the invention the aqueous surfactant solution and the dense fluid carbon dioxide are introduced into the formation by sequential slug injections of the foam generating compositions. In another embodiment oil is displaced from an oil-bearing underground formation by plugging more permeable portions of the formation as described above, introducing a drive fluid into the formation and producing recovered oil and drive fluid from a well penetrating the formation.