Anti-loosing and corrosion-proof dental-implant central screw

Abstract

The invention discloses an anti-loosing and corrosion-proof dental-implant central screw, which is characterized in that the minor thread diameter of the screw is 1.5-2.5 mm, the height of a thread form of the screw is 1 / 10 of the minor thread diameter, and the surface of the screw is coated with a phosphorus-containing TiO2 membrane by using a sol-gel method; the thread form of the central screwis triangular, the flank angle of a leading flank is 30 degrees, and the flank angle of a following flank is 20 degrees; the thread crest is arc-shaped, junctions between a thread root and the leading flank as well as the following flank are also arc-shaped, and the curvature radiuses of the arc-shaped parts are all 1 / 50 of the minor thread diameter; the pitches between five channels of screw threads (close to a screw cap) of the central screw are 0.4-0.5 mm, the thread root inclines inwards along the screw cap, and a 10-degree included angle is formed between the thread root and a thread axis; and the pitches between the other screw threads are 0.8-1.0 mm, and the thread root is parallel to the thread axis. The central screw disclosed by the invention is uneasy to loose, difficult to corrode, reliable in performance and long in service life, therefore, the central screw can be used for improving the long-term success rate of dental implants.

Description

technical field [0001] The invention relates to a component of a dental implant for dental restoration, in particular to a central screw of the dental implant. technical background [0002] With the development and improvement of osseointegration theory and decades of clinical practice, dental implants have become one of the key restoration techniques for missing teeth. Compared with traditional removable dentures and fixed dentures, dental implants are aesthetically pleasing and comfortable. , stronger chewing function and other advantages. Although recent studies have shown that the five-year success rate of dental implants can reach 94.8% (upper jaw), 97.5% (lower jaw), the overall success rate is 96.1%. However, with the further extension of the service time, the long-term success rate of dental implants has a further downward trend. The 16-year follow-up success rate in foreign countries is reported to be 82.94%, and the domestic 11-15-year follow-up success rate is re...

AI Technical Summary

Problems solved by technology

The central screw serves in a very special environment of oral corrosion. A large amount of moisture and enzymes in the oral cavity, changing temperature and pH value, occlusal force and abnormal function, bad habits, etc. can cause fatigue and aging of the sealing material of the fixed screw hole of the implant. , resulting in poor edge sealing, micro-leakage is unavoidable, and corrosive media can easily penetrate into the extremely small gaps in the interface of the central screw; during the operation, the surface of the central screw will inevitably be affected by saliva, blood, Contamination of liquids, etc.

The above factors cause the central screw to be easily corroded, resulting in poor performance and failure; at the same time, corrosion will also accelerate the loosening of the central screw

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