Abstract: Adhesion promoters containing (meth)acryloyloxyethyl dihydrogen phosphate and/or di(meth)acryloyloxyethyl hydrogen phosphate and acidic (meth)acryloyloxyethyl esters of carboxylic acids can improve the adhesion of photopolymerizable tooth materials to the enamel and dentine. The very strong bonding to the dentine immediately after curing proves to be particularly advantageous.

Abstract: A driving circuit for a low-pressure discharge lamp, particularly a compact fluorescent lamp, features a heating transformer with two separate secondary windings, which are respectively permanently connected to the lamp electrodes, and furnish them with pre-heating current. Parallel to the primary winding of the transformer, there is connected a series circuit of an operating switch, a ballast inductor, and the discharge path formed between the lamp electrodes. The electrodes are connected to each other via a starter connected in parallel to the discharge path.

Abstract: Firmly adhering, durable dental metal/plastic composite structures that are stable in the presence of moisture can be made from dental alloys and plastics, if an adhesion promoting layer having a concentration gradient and comprising silicon dioxide and metal oxide, particularly chromium oxide, is disposed between them.

Abstract: The present invention is an improvement upon a known apparatus for polymerization of a body from dental plastic material by irradiation of the body with radiation of a selected wave length in the range between about 350 nm and about 550 nm. To achieve a desired degree of polymerziation of the dental plastic, a specific amount of radiation must be applied to the body. In order to achieve reproducible irradiation results in spite of fluctuations in supply voltage, alterations in lamp characteristics, burn out of one or more lamps, shifting of spectral outputs, replacement of defective or superannuated lamps, soiling of lamps and reflector surfaces and/or changes of operating temperatures in the irradiation area, a supplemental detection system in provided.

Abstract: Fingernail light systems for curing photopolymerizable plastics on fingernails are known, having a housing with a bottom plate 7, in which housing a support body 4, having indentations 18 on its outer contour, is provided for positioning the fingers of the hand 5 to be irradiated, and having at least one irradiation lamp 14, which at least partially surrounds the support body in a spaced-apart manner in the irradiation position, the support body being accessible in the irradiation position via an opening 10 in the housing.

Abstract: Light systems, in particular for curing photopolymerizable plastics on fingernails, are known which have an irradiation chamber in which one or more irradiation lamps are located and having a fan for ventilating the irradiation chamber, the fan being located in a region of the housing partitioned off from the irradiation chamber. To provide a light system, in particular for irradiating artificial fingernails, that has an adequate forced ventilation of the irradiation chamber regardless of the position of the fan in the housing and regardless of the flow courses, while still being compact in structure, an air distribution chamber is provided between the irradiation chamber and the suction or compression side of the fan. The air distribution chamber is partitioned off from the irradiation chamber by a wall having air openings, and with increasing distance from the suction or compression side of the fan, the cross-sectional area for the passage of air to the air treatment chamber is greater.

Abstract: To provide for essentially uniform ultraviolet (UV) irradiation of all the nails of all the fingers of a hand of a user, a radiation source of essentially horseshoe shape is placed within a housing. The plane, in which the radiation source is located, is inclined with respect to the bottom wall (2) of the housing, on which the hand of the user is supported. The radiation is directed to impinge on the nails at about 90.degree.. The nail of the thumb also has radiation impinging at about 90.degree.. The radiation source may be a single, bowed, UV-emitting lamp, or may be built-up of straight lamp sections (12,13), e.g., two lamps along the housing sides for irradiating the thumbs, and one or two lamps across the housing to irradiate the nails of the index finger through little finger.