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.
In other words, the dentist can treat dental diseases and conditions that he or she feels qualified to treat. Patients present to dentists with a spectrum of conditions and diseases, some less common or more complex than others. The profession of Dentistry has historically responded by developing specialty programs to train dentist to meet the needs of these patients; Periodontics is one of the dental specialties. In the early twentieth century Periodontics began as a specialty that treated periodontitis or gum disease.