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occupation class
A group of occupations that present a similar risk to an insurance company. If all other factors are equal, people in the same occupation class will pay the same premium rates for health insurance.

orthodontia
For purposes of this Plan, orthodontia is any procedure concerned with the growth, guidance, correction and maintenance of the dentofacial complex, with special emphasis on developmental disturbances and those conditions that cause or require movement of teeth. The area of orthodontia practice includes the diagnosis, prevention, interception and treatment of all forms of malocclusion of the teeth and the associate alterations in their supporting structures; the design, application, and control of functional and corrective appliances; and the guidance of the developing dentition to attain optimum occlusal relations in physiologic and aesthetic harmony with other facial and cranial structures.