Abstract: The present invention discloses a method for preparing tooth structure, such as dentin and enamel, for bonding with a composite material. The method includes the steps of creating a first fluid stream laden with an abrasive material, such as aluminum oxide and a second liquid stream. The fluid streams are directed towards the tooth structure so that the abrasive material laden fluid stream and liquid stream both impinge upon the tooth structure and roughen it for enhanced bonding with composite material.

Abstract: A dental hand piece is provided for use in conjunction with a source of pressurized water, a source of pressurized gas and a source of abrasive material. The hand piece includes an elongated body having a proximal end and a distal end. An internal mixing chamber is formed within the body and this mixing chamber is fluidly connected to a first outlet port at the distal end of the body by a first passageway. The source of pressurized water is fluidly connected to the mixing chamber by a second fluid passageway formed in the body while the pressurized gas source is fluidly connected by a third fluid passageway in the body to the mixing chamber. A fourth fluid passageway in the body fluidly connects the source of abrasive material to a second port formed at the distal end of the body. The first and second fluid ports are oriented so that the affluent from the first and second ports intersect each other at a predetermined distance from the distal end of the body.