Abstract: A device for automatic dilution of chemical additives and water utilizing a single pump (20) drawing water and other chemical additives through a dilution manifold (10). The introduction of air into the system is monitored such that the system performance is not impaired. If the air leak is small corrections can be made, and if the air leak is large, the system will shut down and activate an indication or alarm to signify that some malfunction has occurred, such as a chemical supply is unconnected or empty.

Abstract: An electronic drive for fluorescent lamps that includes a feedback loop arrangement where a lumen or intensity setting is compared to the lamp current and the frequency of an inverter is changed to bring the lumen output of the lamp to a level that matches the setting. The bandwidth of the feedback loop is great enough such that the time delay around the feedback loop is faster than prior art designs, and is preferably about 50 microseconds. This fast feedback loop provides the advantage that fluorescent lamps, and especially the more non-linear fluorescent lamps, can to be dimmed down to 10-30% of normal full scale lumen output without extinguishing. The faster feedback loop also prevents flicker when as the lamp is dimmed.

Abstract: A tooth replacement including an implant (24), abutment (2), and crown, where the abutment is shaped to match the tooth being replaced in inclination, orientation and gingival emerging profile. A method is also claimed where measurements of the teeth adjacent to the implant are taken along with other relevant oral measurements. These measurements are input to a computer which generates data for guidance and control of the forming of an abutment, including at least the size, shape, inclination, and orientation of the abutment. The abutment shape corresponds to that of the tooth being replaced, but of a reduced size such that the crown attached to the abutment matches the tooth being replaced. Preferentially, the abutment is both the healing and the permanent abutment which saves time, money and aggravation. The abutment is made of anyone or combinations of several metals and materials benign to the body, as are known in the art.