A syringe fill system is described, which is useful for filling syringes for dental anesthetic applications. The system incorporates capability for &ldquopush-pull&rdquo, &ldquopull-push&rdquo, &ldquopush-push&rdquo, and &ldquopull-pull&rdquo modes of operation, for loading syringes with compositions comprising multiple fluid components. A syringe fillable by such syringe fill systems is described, providing haptic and audible feedback to a user, to aid in administering precise amounts of therapeutic compositions. Also disclosed are cassette assemblies for use in such syringe fill systems. Such cassette assemblies may be formed of plastic and elastomeric materials of construction, as disposable or single-use components of the syringe fill system.
