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U abutment, U-shaped gravity abutment; Cantilever abutment, cantilever retaining wall designed for large vertical loads; Full height abutment, cantilever abutment that extends from the underpass grade line to the grade line of the overpass roadway; Stub abutment, short abutments at the top of an embankment or slope, usually supported on piles
In dentistry, an abutment is a connecting element. [1] This is used in the context of a fixed bridge (the "abutment teeth" referring to the teeth supporting the bridge), partial removable dentures (the "abutment teeth" referring to the teeth supporting the partial) and in implants (used to attach a crown, bridge, or removable denture to the dental implant fixture).
A cantilever is a bridge where a pontic is attached to a retainer only at one side. The abutment tooth may be mesial or distal to the pontic. [3] In a spring cantilever, the pontic and retainer are remote from each other and connected by a metal bar. Usually, a missing anterior tooth is replaced and supported by a posterior tooth.
In dentistry, Ante's law is a postulate about crown-to-root ratio put forth by Irwin H. Ante [1] in a thesis paper he wrote in 1926. [2]Ante's law states that "the total periodontal membrane area of the abutment teeth must equal or exceed that of the teeth to be replaced."
A multi-unit abutment (MUA) is an abutment most commonly used with dental implants in "All-on-Four" protocols. [1] [2] They are designed for screw-retained group restorations, [3] which are often used in combination with angled dental implants [4] and whole arch replacements, as well as screw fixation of bridges made of zirconium or metal-ceramic group restorations to the implant.
In implant dentistry, the implant-abutment junction (IAJ) refers to the location of intimate contact between a dental implant and its restorative abutment.. The IAJ is a focus of much attention because its morphology and location tend to affect the amount of bone resorption during the initial period of crestal bone changes immediately following implant placement.