Abstract: A precision electric welding device is used for welding dental crowns and bridges in the mouth. The dental elements to be welded comprise dentally suitable metals, especially titanium and titanium alloys. The device comprises a welding gun and a base unit provided with a direct current voltage source and a storage device for storing welding sequences. Each welding sequence defines the energy requirements for successive pulses in a particular welding operation. The base unit generates a series of controlled voltage potentials for each operation, and the welding gun is responsive thereto for performing the welding operations. The portable welding system is of the capacity-discharge, contact-resistance type, and performs welding with high-precision endo-oral metals by generating controlled sequences of electrical energy pulses (1) selected from a permanent storage library, or (2) manually controlled from a local console, or (3) externally controlled from an external computer.

Abstract: Dental crowns, bridges and jointing implements or tabs for dental prostheses which are capable of being welded in the mouth are disclosed. These structures are preferably comprised of high purity titanium alloy. The dental crowns are formed as a cast or prepressed central cap in the shape of the tooth to be treated. The crown is additionally provided with one or two tabs which correspond to one or both of the linking sides of the crown with an adjacent crown. The titanium jointing tabs are designed for coupling and welding in the mouth and may be used with crowns or bridges of conventional structure such as gold or a gold alloy. Each jointing implement is provided at one end with a shaped element such as a screw to be rigidly coupled to the crown. The jointing implement is also optionally provided with one or more microindentations on the inside lateral surface to facilitate welding in the mouth with the jointing implement or tab of the crown element associated with the adjacent tooth.

Abstract: A precision electric welding device is used for welding dental crowns and bridges in the mouth, the dental elements to be welded being made up of dentally suitable metals, especially of titanium and titanium alloys. The device comprises, in combination, an electronic welding base unit supplied with direct current voltage source and provided with a storage device containing a plurality of welding sequences, each welding sequence defining the energy requirements for successive pulses in a particular welding operation. The base unit generates a series of controlled voltage potentials for each operation, and an interdental precision electric welding gun is responsive to said series of controlled voltage potentials for performing the welding operations.