Abstract: The orthodontic device includes a base member for attaching to a tooth, a wire duct on the base member, a channel besides the wire duct, a cover element slidably configured on the base member, a positioning element embedded to the cover element, a flexible block inside the positioning element, a roller rotatably positioned between the channel and the positioning element, and a filler for sealing the channel As the roller facilitates the opening and closing of the cover element, the flexible block provides an inward deformation capability to the positioning element, thereby reducing the wear between the roller and the positioning element. The cover element as such may be repeatedly and reliably opened and closed. The limitation by the filler to the roller provides assembly convenience.

Abstract: A dental traction device comprises an extension main-body, a tractive-body, a blocking-stopping-body, and a seat-body. When using, the dental orthotics are firstly set and the dental correction archwire connection is set, and the bone nail is set at the gum; then, the seat-body is fixed on the dental correction archwire; one end of the elastic element is bypass the blocking-stopping-body to stick and engage on the tractive-body and the other end is stuck and engaged on the bone nail; then the blocking-stopping-body is cooperated with the tractive-body to fix the elastic element to avoid falling-off; and the contraction elastic force of the elastic element generates the pulling force to the dental correction archwire and the teeth by using the extension main-body as the force moment to produce the traction correction effect; and so as to achieve the practicality and progressiveness which is convenient in use and avoids falling-off.

Abstract: A dental traction device mainly comprises at least one seat-body set with a bonding-surface and a rod-body; wherein the bonding-surface and the rod-body are located at two different opposite sides; wherein the rod-body comprises a bending-portion and an extending-portion, which the bending-portion is connected on the seat-body to change the extension direction of the rod-body; wherein the extending-portion is connected on one end to extend the rod-body length, and one end of the extending-portion facing away from the bending-portion is set with a engaging-hooking piece; thereby, the seat-body can be adhered on the tooth of the user and then the elastic element is stuck and engaged on the engaging-hooking piece to cooperate with the extending-portion to generate a status of force moment; which will simultaneously move and rotate the teeth to be closer for each other, and so as to have the dual effects rapidly and conveniently.