Abstract: A dental adhesive composition containing as major components:(a) at least one isocyanate-group-containing urethane prepolymer,(b) at least one isocyanate-group-containing silane compound,(c) at least one radical-polymerizable unsaturated monomer, and(d) at least one initiator selected from the group consisting of redox polymerization initiators and photopolymerization initiatorsis disclosed.This composition is excellent in bonding properties when it is used to bond a living dental tissue with a restoring material such as a metal, organic polymer, and ceramic. Also, this adhesive composition does not require a troublesome pretreatment of the restoring material with an etching agent such as phosphoric acid when the restorating material is required to bond to the living tissue.

Abstract: Disclosed are dental adhesive compositions consisting essentially of(a) at least one urethane prepolymer containing one or more isocyanate groups, or a blend of the urethane prepolymer and an inert diluent;(b) at least one radical-polymerizable unsaturated monomer;(c) a photopolymerization initiator;and, if desired,(d) a polymerizable phosphoric ester compound having a specific structure.These dental adhesive compositions can be used to bond a restorative material to dentin without requiring any troublesome pretreatment with an etching agent such as phosphoric acid, and can exhibit bonding power sufficient for practical purposes.

Abstract: A noise suppressor for a vehicle including a branch circuit of low impedance connected to an electrical circuit through which a high frequency current passes in a standing wave. The branch circuit is connected at approximately a point corresponding to a node of the standing wave, and is of a length related to the wavelength of the current.

Abstract: A distributor containing an apparatus for suppressing noise is described, comprising an electrode of a distributor rotor and a group of electrodes of a plurality of stationary terminals which are arranged along a circular locus defined by the rotating distributor rotor keeping a constant spark discharging gap, wherein the surface of at least one of said electrodes of the distributor rotor and the stationary terminals is formed by an electrically high resistive material layer. The base layers for the electrodes and terminals are disclosed as made of silicon, brass, invar, steel and aluminum. The electrically high resistive layers are disclosed as made of silicon dioxide, copper oxide, aluminum oxide and invar oxide.

Abstract: A method for measuring the axial force exerted on a body to be measured by applying two ultrasonic frequencies respectively having a transverse-wave vibration mode and a longitudinal-wave vibration mode to a body on which an axial force is exerted, measuring the natural frequencies of the body in the transverse-wave and longitudinal-wave vibration modes, obtaining the result of a computational operation (e.g., the result of a subtraction) on the measured natural frequencies, and measuring from this result the axial force exerted on the body in accordance with the predetermined result-versus-axial force calibration values.