The inner layer of the material structure consists of a highly airtight substance, while the skeletal framework is composed of high-strength aramid fibers; the outer protective coating uses rubber materials that are resistant to aging and ozone degradation. Both pneumatic shield-type rubber dams and standard rubber dams rely on inflatable bladders for operation; however, because of fundamental differences in their constituent materials and performance characteristics, their service lives differ significantly. The bladder of the pneumatic shield-type rubber dam is a composite structure comprising three distinct layers: an inner layer of synthetic rubber reinforced with polyester fibers, a middle layer of monomeric synthetic rubber, and an outer layer consisting of a rubber compound formulated to resist ozone and ultraviolet radiation. Comparative analysis reveals substantial disparities between the two types—not only in terms of material composition but also regarding their physical and mechanical properties; consequently, the dam bag designed for a standard rubber dam cannot serve as a substitute for the bladder used in a pneumatic shield gate. After weighing factors such as operational flexibility, reliability, and service life, the bladder system specifically designed for pneumatic shield gates was ultimately selected.