Undercut

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ECM

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Organizational Behavior

by Radwan Hussein

Undercut

Undercut Shape Images

Generalized

denture fibroma

Localized

Causes

Aging Changes

Tuberosity with pneumenization of maxillary sinus air cells….etc

Genial tubercle prominence ...

Interior oblique ridge prominence ...

Post Extraction Problems

Uncompressed socket …etc

Bone Disease

Bone tumor….etc

Bone exostosis ...

Soft Tissue Disease

Soft tissue tumor….etc

Fibromatosis ...

Developmental

Mandibular tori….etc

Undercut Management

The use of implant retained fixed dentures

Without flanges ...

Surgical Correction

Bone shaping….etc

Soft tissue corrections….etc

Relief

For one of the bilateral undercuts ...

Utilize It

Rotational path of insertion ...

Unilateral ...

If less than 180 degree ...

Leave It

Reduce distolingual length ...

Outside denture area ...

Defintion ( \Un´dur-kUt\ n (1859) )

3: any irregularity in the wall of a prepared tooth that prevents the withdrawal or seating of a wax pattern or casting

2: the contour of a cross-sectional portion of a residual ridge or dental arch that prevents the insertion of a dental prosthesis

1: the portion of the surface of an object that is below the height of contour in relationship to the path of placement