Prosthodontics & Occlusion · single question
Same case (RPD with non-rigid connector). What is the main PURPOSE of this connector?
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Correct answer: A. Retention
The main PURPOSE of a precision/non-rigid attachment (connector) in RPD design is RETENTION — it provides a mechanical means of engaging the tooth structure to keep the denture in place. Unlike clasps that provide retention through flexible arms engaging undercuts, precision attachments provide retention through a male-female interlocking mechanism.
- A. CORRECT. The primary purpose of a precision (non-rigid) attachment is RETENTION — it secures the RPD to the abutment tooth and prevents displacement along the path of insertion.
- B. INCORRECT. While esthetics is an ADVANTAGE of precision attachments (see next question), it is not the primary PURPOSE.
- C. INCORRECT. Stability (resisting horizontal displacement) is provided by bracing arms and the major connector.
- D. INCORRECT. Support (resisting apical/occlusal displacement) is primarily provided by the rest seats in an RPD.
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