| http://www.w3.org/ns/prov#value | - In another embodiment of the invention, there is provided a piezotome operation unit for lifting a maxillary sinus via vertical approaching, the unit including a window body, an end of which is fixedly inserted into a hand piece of a piezo main unit, a window pole extending in a linear or bent fashion from another end of the window body such that the window pole easily approaches the maxillary sin
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