Abstract: A dental treatment unit and method for use by dentists and the like, the treatment unit including an isolated aseptic central core component with a positive pressure internal environment, and which contains a work area for a dental dispensing assistant, plumbing, dental mechanical and electrical components, dental equipment and controls, dental instruments, and dental supplies. The supply core component mechanically engages, conveniently accesses, and provides function to an attachable treatment module enabling a dental team to provide treatment to a patient who is physically separated from all dental materials and medicament containers, cabinet and drawer handles, instruments, and dental devices, thereby creating an aseptic environment heretofore nonexistent in the dental profession. The treatment unit and method effectively eliminate all cross-contaminating common surfaces in the treatment module and provides a highly efficient functional design.

Abstract: The modular roof structure includes a grid system with a plurality of parallel beams and a plurality of roof tiles provided on the parallel beams in an overlapping manner. The parallel beam has an engaging protrusion that projects upward. The roof tile has a front end that is provided with a hook portion to receive the engaging protrusion of the parallel beam, and a rear end which is provided with a projection to abut with the hook portion of an adjacent roof tile and a covering member which shields the hook portion from rain and sunshine.