| 摘要 |
A plastic, disposable, easy-to-assemble dental contra-angle (101) includes a one-piece body (103), a one-piece drive gear and shaft (117, 115), a driven gear (127), and a cap (135). The body (103) includes a sleeve portion (104), a neck (105), and a head (106). The neck (105) is bent about 10 DEG to 30 DEG . The forward end of the shaft (115) has an axial cavity (118) to provide additional flexibility. The shaft (115) is rotatably supported only at its forward end, and its free end bears against a slot (102) in the sleeve portion (104) when the contra-angle is not in use to reduce its degree of bending and to allow it to remain relatively relaxed.
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