From 1952 through 1976, dentists have changed the organization and configuration of their practices in response to several economic, scientific, and personal factors. For instance, there has been an increase in the number of dentists who are shareholders in incorporated practices or who are involved in various cost-sharing arrangements. Technological advances and the increased use of auxiliaries have allowed dentists to provide more dental services in a shorter time, increasing their potential productivity. This is reflected in the increase in the numbers of patients, visits, and visits per hour from 1952 to 1972, and in turn may contribute to the decrease in office hours, allowing dentists to pursue other business or personal interests. Changes in the size of practice may signify innovations in technology and training as well as reflect dentists' personal preferences.