Prosthodontics & Occlusion · single question

For the same tooth #21 with Class III mobility and bone loss to the mid-root, what is the cause of the mobility and bone loss given the precision-attachment RPD?

Distal torque (lever/tipping) forces transmitted to the abutment by the attachment to the removable partial denture
Primary occlusal trauma from a high restoration
An untreated carious lesion
A vertical root fracture from the attachment

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Correct answer: A. Distal torque (lever/tipping) forces transmitted to the abutment by the attachment to the removable partial denture

A precision attachment connecting an abutment to a distal-extension RPD can transmit unfavorable torque/lever forces to the abutment, producing mobility and localized bone loss.Other options: There is no high restoration, caries, or fracture described; the biomechanics of the distal-extension attachment best explain the findings.Key exam takeaway: Distal-extension RPDs and rigid precision attachments can overload terminal abutments, causing mobility and bone loss.

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For the same tooth #21 with Class III mobility and bone loss to the mid-root, what is the cause of the mobility and bone loss given the precision-attachment RPD?

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