Abstract: An orthodontic bracket includes a base with a central opening, and a body with a passage aligned with the opening. A curing light assembly includes an outer end portion that is removably received in the passage for curing adhesive beneath the central section of the bracket body. Once the adhesive beneath the central section of the bracket body has cured to temporarily tack the bracket base to the patient's tooth, adhesive extruded from the peripheral edge of the bracket base can be readily removed without dislodging the bracket from its intended position.

Abstract: In the reproduction of colored images, the "white point", that is to say a point which determines which areas are to be printed with zero-ink, is a critical adjustment. In this invention, signals representing the three color components derived from the original are applied to a NAND gate (14) and when all of these signals simultaneously represent a zero printing color condition, the NAND gate generates a zero-ink signal. This is used to modify the zero-ink or white display on the monitor tube, for example by inhibiting passage of red and blue signals (18R, 18B) to the display tube while allowing the passage of green signals. The green signal to the monitor tube may be periodically interrupted, so that zero-ink areas are shown in pulsating green. The operator then adjusts the white point until the pulsating green areas correspond to the areas of the original which are to be reproduced with zero-ink.