Oral implant with asymmetric thread structure

Abstract

The invention discloses an oral implant with an asymmetric thread structure. The oral implant comprises an implant part c, an implant part b and an implant part a in sequence from top to bottom; a column body is arranged at the contact part of the implant part c and a compact bone; the implant part b adopts a cone with a cambered surface; the bottom surface of the implant part a is a circular arc surface; an asymmetric thread is arranged on the oral implant; the depth of the asymmetric thread is gradually decreased from the implant part b to the implant part c and the implant part a on the two sides of the implant part b; the inclined angle between the upper edge of the asymmetric thread and the horizontal plane is smaller than that between the lower edge of the asymmetric thread and the water level; a circular arc surface is arranged at the transition part of either the upper edge or the lower edge of the asymmetric thread and the vertical surface of the bottom diameter of the asymmetric thread; the helix angle of the asymmetric thread is varied along with the variation of the diameter of the implant; the thread structure can transfer a bite force well, has a good retention force, and can avoid stress concentration; the screw pitch is reasonable, the helix angle has self-lock performance, and the stability is improved; the variable thread depth can reach the optimal bone bonding strength.

Description

technical field [0001] The invention belongs to the field of oral implants, in particular to an oral implant with an asymmetric thread structure. Background technique [0002] Dental implant technology has been developed for more than 30 years. From the early leaf-shaped structure and columnar structure to the current threaded structure, the stability and reliability of implants have been effectively improved. Different thread structures have different mechanical transmission properties, which in turn have different effects on the surrounding bone tissue. In addition to the cross-sectional shape of the thread, the thread structure also includes the pitch and thread depth. Common thread forms include V-shaped thread, rectangular thread, and zigzag thread (asymmetrical thread). The performance of V-shaped thread in transmitting vertical force is poor, the retention force of rectangular thread is average, and the overall performance of zigzag thread is better than the above tw...

AI Technical Summary

Problems solved by technology

Theoretically, the smaller the pitch, the denser the thread, which will increase the force and bearing area of ​​the implant, and enhance the stability. However, the denser thread will cause more damage to the bone interface, which will increase the stress of the bone interface of the implant and lead to bone fatigue. Damage; excessive pitch, increased lift angle, reduced implant stability

Increasing the depth of the thread can increase the contact area with the bone and increase the support, but increasing the depth of the thread will increase the torque of the implant. Excessive torque will burn the bone and cause bone damage

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