Bonding agents for digital denture and polymer work. VITA Vionic Bond is an MMA-based, self-curing two-component bonding system for fixing digital denture teeth in a digital denture base. Harvest EasyGum Bond is an all-in-one composite bonding agent for the EasyGum gingiva system, used on polymers, metal and zirconia hybrids, dentures and try-ins, printed or milled.