Dental implant

  • US 8,052,422 B2
  • Filed: 08/29/2008
  • Issued: 11/08/2011
  • Est. Priority Date: 08/29/2008
  • Status: Active Grant
First Claim
Patent Images

1. A dental implant for inserting into a sinus of a gum, comprising:

  • a dental implant body which is a cylindrical body having a first end, a second end, a ferroembrace, and an asymmetric thread formed around said dental implant body, wherein said second end is a threadless end portion and said asymmetric thread has an elongated segment of main thread portion and a short segment of end thread portion provided adjacent to said second end portion while said main thread portion extending immediately from said end thread portion to said first end, wherein said main thread portion has a first side, a second side and a blade edge at a tip between said first and second sides, and said end thread portion has lower height and shorter pitch than said main thread portion, so as to form said asymmetric thread, wherein said ferroembrace which is provided around said second of said dental implant body has a bevel wall extending inwardly from a periphery edge of said second end for placing the gum on said bevel wall of said ferroembrace after said dental implant is inserted in the sinus of the gum;

    an apex lock formed at said first end of said dental implant body for inserting into the sinus of a desired position, wherein said apex lock has an apex cavity which is a blind hole indented in said first end and has a cavity bottom and a cavity wall extending to a periphery edge of said apex lock, wherein said apex cavity defines an apex opening allowing a new grown bone of the sinus to grow therein, wherein said apex lock comprises a lock element which is an internal thread provided on said cavity wall of said apex cavity for providing a locking mechanism to ensure an integration between said dental implant and the bone of the sinus, wherein said internal thread of said cavity wall of said apex cavity is oriented in an opposite direction of said asymmetric thread, thereby when a force is applied to loosening said asymmetric thread, said internal thread of said apex lock is fastened at the same time; and

    an endomaximum lock provided at said second end of said implant body for integrally connecting with an abutment through a bolt;

    wherein said end thread portion of said asymmetric thread of said dental implant body has a smaller dimension than said main thread portion for increasing contact area between said end thread portion and a surrounding bone of the sinus for stability;

    wherein said first side of said main thread portion of said asymmetric thread, which is facing the first end of said dental implant body, has a smaller slope angle while said second side of said main thread portion of said asymmetric thread, which is facing said second end of said dental implant body, has a larger slope angle, rendering said second side being more precipitous than said first side, thereby said first side with smaller slope angle reduces resistance when said dental implant is inserted into said sinus, and said second side with larger slope angle increases resistance to pull said dental implant out of said sinus so as to increases a stability of said dental implant after inserted into said sinus;

    wherein said blade edge is a self-cutting edge for cutting into the surrounding bone of the sinus without drilling out the surrounding bone of the sinus for maximally reducing bone loss during the inserting of said dental implant into the sinus;

    wherein said main thread portion of said dental implant body has a tapered insertion root portion adjacent said first end thereof and a plurality of apex indentions spacedly formed in said insertion root portion of said dental implant body, wherein each said apex indention has a V-shape cross section defining two blade surfaces cutting into said dental implant body from a tip of said first end of said dental implant body, wherein at said two blade surfaces, said blade edge forms one or more cutting blades, thereby when said dental implant is screwed inside the sinus, said cutting blades cut into the surrounding bone of the sinus first and any surrounding bone drilled out by said cutting blades is reserved inside said apex indentations.

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