Removable partial dentures become less retentive over time – “less grippy”

Partial dentures which are retentive at fit become less retentive over time when worn. Retention in this context means the grip of the denture on the teeth.

 This occurs mainly because of:

·       settling of the supporting teeth

·       clasps deforming slightly

I warn the patients that this will occur.

In most circumstances, this goes unnoticed by the patient as their adaptation and neuromuscular control offset this gradual reduction in “grip". It happens less quickly when a major part of the retention is from friction (guide surfaces and accurate dentures) rather than clasps’ resistance to deflection.

Denture Blog 56

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