Abstract: The invention is a device for determining the thickness of radar absorption material coatings. The device comprises a radiating element assembly 22 for transmitting RF energy to and recovering reflected RF energy from the coating. A source of frequency modulated RF signal, including an FM ramp generator assembly 11, buffer amplifier assembly 13 and Gunn oscillator 16, is provided. A ferrite circulator 20 is adapted to direct the source of modulated RF signal to the radiating element assembly 22 and the reflected RF energy to a detector assembly. The detector assembly includes a Schottky detector 24, a video amplifier assembly 40, a converter/driver assembly 42, and a digital display 44, and is adapted to sense the reflected RF energy from the coating and provide a visual display in the form of a voltage inversely proportional to the amount of the reflected RF energy.

Abstract: There is disclosed a process and a material for brightening teeth. The process comprises the construction of a splint around the tooth or teeth to be brightened, followed by the insertion within the splint of a brightening agent selected from one of many peroxide groups. The splint is constructed so that the splint is relatively liquid tight to the gingiva. The brightening agent is periodically renewed and can be mixed with various other agents to increase the nascent oxygen release aerating factors. In one embodiment, the peroxide that is used is a 10% solution of carbamide peroxide mixed with a water free gel.

Abstract: There is disclosed a .Iadd.novel .Iaddend.process and a .[.material.]. .Iadd.composition .Iaddend.for brightening teeth.Iadd., together with a novel use of old compositions for brightening teeth. .Iaddend.The .Iadd.novel .Iaddend.process .Iadd.and use each comprises .Iaddend..[.comprises.]. the .[.construction.]. .Iadd.placing .Iaddend.of a splint around the tooth or teeth to be brightened, .[.followed by the insertion within the splint of.]. .Iadd.with .Iaddend.a brightening agent .[.selected from one of many peroxide groups.]. .Iadd.comprising a composition capable of sustained nascent oxygen release.Iaddend.. The splint is constructed so that the splint is relatively liquid tight .[.to the gingiva.].. .Iadd.Preferably, .Iaddend.the brightening agent is periodically renewed .Iadd.during the day .Iaddend.and can be mixed with various other agents to increase the nascent oxygen release .[.aerating factors.].. In one embodiment, the .[.perioxide.]. .Iadd.peroxide .Iaddend.