Cool Temp Natural Automix Temporary Crown and Bridge Material, Cartridge Refill Shade A2, Package of 1 - 50 mL Cartridge and 10 Mixing Tips. Cool Temp Natural Temporary Automix Crown and Bridge Material is a bis-acrylic, MMA-free resin composite that allows chairside, laboratory, or matrix-guided fabrication without requiring a dispensing gun. It prevents pulp damage or irritation and strongly resists bending and abrasions.