Abstract: According to an aspect of the present invention there is provided a tip for fitting to a nozzle of an air abrasion dental tool. The tip comprises a tip body having a central bore that extends through the length of the tip body from an inlet end to an outlet end. The inlet end of the tip body is configured to receive and form an interference fit with the nozzle of the dental tool. The outlet end of the central bore is provided with at least one flexible prong that extends outwardly from the outlet end in a direction that is substantially parallel to longitudinal axis of the central bore.

Abstract: A method and system for monitoring when chemicals in a development process need replenishing. The system comprises a reference strip bearing a developed graduated scale of exposure of a radiation sensitive medium to a range of exposures and a testing module comprising a radiation shielded pouch and an unexposed radiation sensitive medium within the pouch. The said module include a radiation filter for producing a graduated scale of a range of exposures to radiation on a test strip when it is exposed to radiation and subsequently developed. The scale on the test strip being identical to that on the reference strip when the test strip is exposed to the same radiation, and developed in a developing bath with an acceptable chemical level and composition as that used to produce the scale on the reference strip. Means are provided for comparing the scales on the reference and test strips side-by-side.

Abstract: A powder, such as an abrasive powder, is delivered from a pressure vessel having an outlet in the floor communicating with a flow of pressurized gas. A container of the particulate material is located within the pressure vessel and has an outlet to dispense small portions of the particulate material. The material in the container is at substantially the same pressure as that in the pressure vessel itself.

Abstract: A dental tool for the delivery of pressurized air containing abrasive media includes a supply of unpressurized water which joins the leading end of the tool at a location at which the water is drawn to form a curtain about the pressurized air/media flow.