Mechanical principles associated with removable partial dentures
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Mechanical principles associated with removable partial dentures

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Removable Prosthodontics

Removable Prosthodontics

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Mechanical principles associated with removable partial dentures Presentation Transcript

  • 1. Removable Partial Dentures by design are intended to be placed into and removed from the mouth.  Because of this they cannot be rigidly connected to the teeth or tissue. This makes them subject to movement in response to functional loads, such as those created by mastication.
  • 2.  In human body, movement can occur in any of the three fundamental planes which are mutually perpendicular to each other and therefore intersect at right angles.  There are also three axes called the transverse axis, vertical axis and the saggital axis.  Rotation movement of RPD around any of the three axes can occur only within the plane that runs exactly perpendciular to that axis.
  • 3. Movement occurs in this plane relative to a mediolateral axis that is perpendicular to the saggital plane
  • 4. Movement in this plane occurs around a vertical axis that is perpendicular to the horizontal plane
  • 5. Movement in this plane occurs relative to an anteroposterior axis running perpendicular to the frontal plane