Asymmetrical dental implant

1. A dental implant for supporting a dental prosthesis, the implant comprising:

a body comprising an outer surface, an apical end, and a coronal portion;

at least one thread located on at least a threaded portion of the outer surface of the body, the thread comprising a coronal flank and an apical flank, the thread further comprising a face extending between the coronal flank and the apical flank; and

a collar at the coronal portion of the dental implant, the collar comprising a curved surface defining a first peak, a second peak generally opposed to the first peak, a first valley between the first peak and the second peak, and a second valley between the first peak and the second peak and generally opposed to the first valley;

wherein a most apical point of the first valley is more coronal than a most apical point of the second valley, wherein when viewed from a side along an axis passing through the first and second peaks, between the first and second peaks adjacent the first valley, the curved surface of the collar is only convex.

2. The dental implant of claim 1 , wherein the curved surface between the second valley and the first peak is concave shaped.

3. The dental implant of claim 1 further comprising a helical groove formed on the outer surface of the body and located between the apical and coronal flanks.

4. The dental implant of claim 1 , comprising a first groove having a helical pattern, the first groove being formed on at least a portion of an apical flank of the thread.

5. The dental implant of claim 1 further comprising a cavity located at least partially in the coronal portion of the body, the cavity being open towards the coronal end of the dental implant and configured to attach an abutment.

6. The dental implant of claim 5 , wherein the cavity comprises at least one surface that tapers inwardly to form a substantially conical portion that extends from a top surface of the implant.

7. The dental implant of claim 6 , wherein the substantially conical portion defines a conical half angle with respect to a longitudinal axis of the implant between about 10 degrees and about 20 degrees.

8. The dental implant of claim 6 , wherein the substantially conical portion defines a conical half angle with respect to the longitudinal axis of the implant of about 12 degrees.

9. The dental implant as in claim 6 , wherein the substantially conical portion has a length measured from the top surface in a direction along a longitudinal axis that is equal to or greater than at least about 1 mm.

10. The dental implant of claim 6 , further comprising an interlock recess comprising at least one flat side positioned below the substantially conical portion.

11. The dental implant of claim 10 , wherein the ratio of the length of the conical portion and the length of the interlock portion is about 1:1.

12. The dental implant of claim 6 , further comprising an interlock recess that includes at least one anti-rotational feature positioned apical to the substantially conical portion, and a threaded portion that includes a thread positioned below the interlock recess.

13. The dental implant of claim 1 , further comprising a plurality of substantially horizontally extending grooves on the collar.

14. The dental implant of claim 1 , wherein the curved surface of the collar at the second valley is oriented at an angle relative to the longitudinal axis.

15. The dental implant of claim 1 , wherein the curved surface of the collar at the first valley is oriented at an angle relative to the longitudinal axis.

16. The dental implant of claim 1 , wherein the curved surface of the collar at the first and second peaks is oriented normal relative to the longitudinal axis.

17. The system of claim 1 , wherein the curved surface of the collar at the first and second valleys is oriented at an angle relative to the longitudinal axis and wherein the curved surface of the collar at the first and second peaks is oriented normal relative to the longitudinal axis.

18. A system for replacing a tooth, the system comprising:

a dental implant having a body comprising an outer surface, an apical end, and a coronal portion;

at least one thread located on at least a threaded portion of the outer surface of the body, the thread comprising a coronal flank and an apical flank, the thread further comprising a face extending between the coronal flank and the apical flank; and

a collar at the coronal portion of the dental implant, the collar comprising a curved surface defining a first peak, a second peak generally opposed to the first peak, a first valley between the first peak and the second peak, and a second valley between the first peak and the second peak and generally opposed to the first valley; wherein the first valley has a most apical point that is more coronal than a most apical point of the second valley, wherein when viewed from a side along an axis passing through the first and second peaks, between the first and second peaks adjacent the first valley, the curved surface of the collar is only convex; and

an abutment configured to be coupled to the dental implant, the abutment having an elongate body comprising a coronal portion, an apical portion, an apical end, and an interlock portion at the apical end, and a transition surface between the coronal portion and the apical portion; wherein the transition surface defines a first transition peak, a second transition peak generally opposed to the first transition peak, a first transition valley between the first transition peak and the second transition peak, and a second transition valley between the first transition peak and the second transition peak and generally opposed to the first transition valley; wherein the first transition valley has a most apical point that is more coronal than a most apical point of the second transition valley.

19. The system of claim 18 , wherein the curved surface of the collar at the second valley is oriented at an angle relative to the longitudinal axis.

20. The system of claim 18 , wherein the curved surface of the collar at the first valley is oriented at an angle relative to the longitudinal axis.

21. The system of claim 18 , wherein the curved surface of the collar at the first and second peaks is oriented normal relative to the longitudinal axis.

22. The system of claim 18 , wherein the curved surface of the collar at the first and second valleys is oriented at an angle relative to the longitudinal axis and wherein the curved surface of the collar at the first and second peaks is oriented normal relative to the longitudinal axis.