[Health care plans: interfaces between the public and private system in the dental sector].

The present work presents a brief history of health plans in Brazil examining the interface between the public and the private sector. The evolution and regulation of the supplementary care system is analyzed, the different care modalities are defined and the main differences between health plans and dental care insurance are pointed out. The coverage provided by the supplementary care system and its relationship with the public health system is shown on the basis of current data.