Abstract: A screw device for orthodontic treatment is formed with a platform part that has a relatively large radial width between a head part and a screw-body part of the screw device, and a neck part that has a radial width smaller than that of head part is also formed between the platform part and the head part. Therefore, a hook ring at the end of a spring (or rubber band) used for orthodontic treatment may be directly fitted from the head part and be positioned at the neck part without worrying about being dropped off. The thickness of the platform part may prop the spring up the gingiva for keeping from friction. By screwing the screw-body part into the maxilla (or mandible) to make the platform part abutted against the maxilla (or mandible), not only may a stable screwing force be provided for securing the screw, but also does the side surface of the platform have a function of facilitating the gingiva tissue to grow, so the healed-over wound will be more even and good looking.

Abstract: A bubble detection system to detect bubbles in photoresist. The system includes photoresist at least one tank, a buffer tank, a pump, and a bubble sensor. The photoresist tank provides the photoresist. The buffer tank stores the photoresist from the photoresist tank. The pump pumps the photoresist from the buffer tank to an end terminal. The bubble sensor is set between the buffer tank and the pump to detect bubbles in the photoresist, and outputs an alarm signal when bubbles are detected. The nozzle is set at the end terminal to output the photoresist.

Abstract: A screw device for orthodontic treatment is formed with a platform part that has a relatively large radial width between a head part and a screw-body part of the screw device, and a neck part that has a radial width smaller than that of head part is also formed between the platform part and the head part. Therefore, a hook ring at the end of a spring (or rubber band) used for orthodontic treatment may be directly fitted from the head part and be positioned at the neck part without worrying about being dropped off. The thickness of the platform part may prop the spring up the gingiva for keeping from friction. By screwing the screw-body part into the maxilla (or mandible) to make the platform part abutted against the maxilla (or mandible), not only may a stable screwing force be provided for securing the screw, but also does the side surface of the platform have a function of facilitating the gingiva tissue to grow, so the healed-over wound will be more even and good looking.

Abstract: An improved hinge system is provided to couple a first component and a second component. The hinge system includes a first fastener (200), a clutch (300), and a second fastener (500). The first fastener includes a first end (220) adapted to be secured to the first component, and a second end defining a first cylindrical portion (210). The clutch includes a first end defining a second cylindrical portion (320) including a first cavity (325) therein, and a boss (330). The first cavity is sized to tightly yet rotatably receive the first cylindrical portion of the first fastener within, so as to form an axle of the hinge. The second fastener includes a first end forming a third cylindrical portion (553) defining a second cavity (550) therein, and a second end (520) adapted to be secured to the second component. The second cavity is sized to slidably receive the boss of the clutch within, in such a manner that the second cavity and the boss cannot axially rotate with respect to each other.