is a graph of the viscosity profiles of the conventional beyar cement and that of the present invention it is believed that the viscosity profile of the present invention will have a rapid initial increase in viscosity due to the wetting of a first pmma fraction a long working time characterized by essentially no increase in viscosity due to the subsequent release of the reaction stemming anti oxidant until it is consumed and then a later viscosity increasing window due to the subsequent wetting of the second pmma fraction in a prophetic embodiment of the invention cement with a viscosity profile as described above is useful in vertebral repair for example in vertebroplasty and or kyphoplasty procedures it is believed that the lengthened working window of the present invention will permit a medical practitioner sufficient time to load a high pressure injection device and inject the cement into a desired location optionally an injection needle or cannula is inserted into the body prior to or concurrent with the mixing so that the window need only be long enough for loading and injection exemplary injection systems include the confidence injection system marketed by depuy synthes spine of raynham mass optionally cement injection into a vertebra is under sufficient pressure to move fractured bone such as vertebral plates of a collapsed vertebra optionally injection of viscous cement under high pressure contributes to fracture reduction and or restoration of vertebral height in a prophetic.