For example, a graphite/epoxy (graphite fibers suspended in an epoxy matrix) lamina may be on the order of 0.127 mm thick. For the purpose of analysis, a lamina is typically modeled as having one layer of fibers through the thickness.
Minnesota allows dental therapists with direct supervision; and advanced dental therapists (ADT) with general supervision. ADTs may be dually licensed as an ADT and registered dental hygienist (RDH). Maine allows dental hygiene therapists (DHT) with direct supervision.
Is a dental hygienist allowed to drill on teeth? I'm a dentist. I do know that some states allow hygienists to administer local anesthesia (which I think is a terrible idea) and perform some other expanded duties. I do know that some states allow assistants to place fillings. Using the drill, however, is solely the doctor's privilege. To my knowledge, no one else has the authority to do so in any U.S. state. Keep in mind that it's entirely possible, in fact, it's likely that the doctor was unaware of the hygienist's actions.