Patent ID: 7569185

Claim:
A syringe system for mixing and for recording the mixing date to permit monitoring of the shelf life of a mixed two-part dental composition, the syringe system comprising: a first pre-dosed composition pre-packaged so as to be contained in a first syringe having a barrel with a first plunger slidable within the first barrel; a second pre-dosed composition pre-packaged so as to be contained in a second syringe having a barrel, with a second plunger slidable within the second barrel, and the separate compositions each having a shelf life significantly greater than the shelf life of the two compositions after they are mixed; the first and second plungers being operable so that by first sliding the first plunger into the first syringe barrel the first pre-dosed composition is introduced into the second syringe barrel so that it contacts the second pre-dosed composition, the two compositions thereafter being either further mixed using one or both syringe barrels, or else applied in a dental procedure by expressing the mixed contents from the second syringe barrel; and time and temperature sensitive marking means, disposed on one of the first or second syringes, which, when activated upon mixing the two compositions, thereafter provides a visual indication which automatically changes over time so as to indicate the lapsed time and temperature conditions from when the two compositions were mixed, and which also changes as a function of temperature, so that the shelf life of the mixed compositions is easily ascertainable from the visual indication.