The Use of Chisels in the Extraction of Mandibular Third Molars: A Technique That May Prevent the Aerosolization of Severe Acute Respiratory Syndrome Coronavirus 2.

An aerosolizing reducing technique for the extraction of impacted mandibular third molars with the use of a bibevel chisel and mallet will be presented. Every oral and maxillofacial surgeon should have this technique in their armamentarium, especially with the current global pandemic with the severe acute respiratory syndrome coronavirus 2, the cause of coronavirus disease 2019. In this era, we must all consider ways to reduce the number of aerosols produced during the extraction of third molars. Prioritizing hand instrumentation with the use of chisels and mallets will reduce aerosolization as compared with the more traditional technique of using a surgical handpiece.

Modified mason model for bulk acoustic wave resonators.

Accurate modeling of a bulk acoustic wave resonator frequency response is limited by the inability of the current 1-D models to simulate certain parasitic modes excited in realistic 3-D structures. A simple technique is proposed to simulate such parasitic modes by employing the 1-D Mason Model of a resonator and a coupling term between the fundamental mode and those parasitic modes. This Modified Mason Model allows accurate simulation of resonators with arbitrary impedance and arbitrary resonating frequency. Finally, the model's prediction is compared with the on-wafer measurement of a ladder-type filter composed of several resonators.

A generic passive matching network for multiplexers.

A systematic approach to matching an arbitrary number of bulk acoustic wave or surface acoustic wave filters is proposed. The filters can be modeled as capacitor networks at frequencies above and below their passbands. The generic matching network consists of a single shunt inductor (or a transmission line) and series capacitors in front of each filter.