Patent Application
20150250563
The present invention relates to a dental implant and particularly to a dental implant equipped with a first internal thread and a second internal thread.
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The fins are extended outwards in a parallel manner. During implant operation the dental implant 70 has to be tapped into human bone. In an event that the implanted angle or depth is undesirable and the dental implant has to be removed, due to the opening 73 of the dental implant 70 is formed in a smooth manner without threads, it cannot be coupled safely with instruments. Therefore it makes clinical operation difficult. Moreover, if the dental implant is located on the posterior side of the upper jaw, the dental implant 70 could be inadvertently pushed into the upper jaw sinus.
Hence there is a need to provide an innovative and novel dental implant with a first internal thread and a second internal thread to resolve the aforesaid problems.
The primary object of the present invention is to provide a dental implant equipped with a first internal thread and a second internal thread. It comprises a fixed part and a connecting part. The fixed part has an external thread region. The connecting part is located on the fixed part and has an opening. The opening has a first inner wall and a second inner wall. The second inner wall is located below the first inner wall. The opening can be connected to an abutment in a threadless manner. The second inner wall has a first internal thread and a second internal thread that are formed in different directions to respectively coordinate with at least one conveying means to facilitate implanting or removing of the dental implant.
Through the first internal thread and the second internal thread the dental implant of the invention can be moved into a human bone or removed therefrom by wrenching to facilitate clinical operation. Moreover, during clinical operation the dental implant of the invention can be coupled with a conveying means without separating or falling off, and prevent the dental implant from falling off or being pushed into the upper jaw sinus
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
It is to be noted that in the following discussion the terms “upper” and “lower” are not related to gravity. The “upper” means proximity to the biting plane or incisive edge of a coupled dental prosthesis, while the “lower” is opposite to the “upper”.
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The connecting part 12 is located on the fixed part 11, and has an opening 120. The opening 120 has a top surface 13 on the dental implant 10 with a bore formed thereon and extended downward. The opening 120 has a first inner wall 121 and a second inner wall 122. The second inner wall 122 is located below the first inner wall 121. The first inner wall 121 does not have internal thread formed thereon. The opening 120 can be connected to an abutment 50 in a threadless manner, namely, the dental implant 10 and the abutment 50 can be connected in a locking taper fashion.
With the abutment 50 and the dental implant 10 connected in the locking taper fashion, the abutment 50 has a first par 51 formed in a conical shape at an angle b slightly greater than an angle a of the first inner wall 121 of the opening 120. Hence when they are made in proper sizes related to each other they can form desired locking and coupling. Such a structure is simple in structure and easy in operation, and also provides improved bacterial closure and does not generate unpleasant odor after implanted onto a patient. In addition, the first part 51 of the abutment 50 is merely in contact with the first inner wall 121 but not in contact with the second inner wall 122. The abutment 50 has a part 52 to couple with a dental prosthesis (not shown in the drawings).
The second inner wall 122 has a first internal thread 123 and a second internal thread 124 that are formed in different directions to respectively coordinate with at least one conveying means to facilitate implanting or removing of the dental implant 10.
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Since the first internal thread 123 and the second internal thread 124 are not in contact with the abutment 50 to receive forces later, they need not be formed in too many rounds in order to avoid the second inner wall 122 from being too lengthy. Thus it facilitates the fabrication of a short implant. More preferably, the first internal thread 123 is formed in one round or less than one round, and the second internal thread 124 also is formed in one round or less than one round. The first internal thread 123 and the second internal thread 124 may be disposed not to cross each other if both the first internal thread 123 and the second internal thread 124 are formed in less than half a round.
Moreover, if the first internal thread 123 and the second internal thread 124 are formed in fewer rounds, they are curved more steeply. Collaborated with the threads that are wide and round, the first internal thread 123 and the second internal thread 124 have fewer cleaning dead spots and can make later cleaning easier.
In this embodiment the second inner wall 122 is a sloped surface and gradually shrunken toward the bottom of the opening 120. The first internal thread 123 and the second internal thread 124 also are extended to the bottom of the opening 120 along the sloped surface of the second inner wall 122, and formed respectively in one round. Moreover preferably, the threads of the first internal thread 123 and the second internal thread 124 on the sloped surface of the second inner wall 122 from the upper side to the lower side are formed gradually in varying depths from shallower to deeper, and the longitudinal diameter of the thread depth are same holistically so that the conveying means is required to respectively turn completely one round to separate from the first internal thread 123 and the second internal thread 124 , which enhance safety in clinical operation.
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The first conveying means 20 also includes a first structural weakened zone 22 located on a region of the first conveying stem 21. The first structural weakened zone 22 is formed at an outer diameter smaller than that of the first conveying stem 21 so that the first conveying means 20 can be fractured at the first structural weakened zone 22 rather than at the first external thread 211.
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The second conveying means 30 further includes a second structure weakened zone 32 located on a region of the second conveying stem 31. The second structural weakened zone 32 is formed at an outer diameter smaller than that of the second conveying stem 31 so that the second conveying means 30 can be fractured at the second structural weakened zone 32 rather than at the second external thread 311.
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Through the first internal thread 123 and the second internal thread 124, the dental implant 10 of the invention can be wrenched into the human bone 40 or wrenched out to facilitate clinical operation. By coupling the dental implant 10 with the conveying means during clinical operation, it does not separate from the conveying means or fall off, hence can avoid contamination of the dental implant caused by falling off, or prevent the dental implant from being pushed into an upper jaw cavity.
While the preferred embodiments of the invention have been set forth for the purpose of disclosure, they are not the limitation of the invention, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2012/084653 | 11/15/2012 | WO | 00 |
