A handpiece tip having a set of longitudinally vibrating piezoelectric elements. The source of pressure may be a compressed gas cylinder provided with valve and conduit means for controlling the admission of compressed gas from the cylinder into the water container, and the means for feeding gas to the filter inlet comprise conduit and valve means for feeding gas to the inlet directly from the gas cylinder. Also, when using an appropriate implementation, the computational requirements for coding an enhancement layer picture consisting entirely of skipped slices are almost negligible. The attenuated threadlines are dried with a defined secondary gaseous source. The semiconductor device includes a core oxide on the semiconductor substrate in the core area, a portion of the core oxide being nitrided, a first polysilicon pattern on the core oxide, an IO oxide including pure oxide on the semiconductor substrate in the peripheral area, and a second polysilicon pattern on the IO oxide.