Stress breaker 4m** 2m**

  1. It is defined as a device, which relieves the abutment tooth of all or part of the occlusal forces (GPT) 
  2. In order to minimize the stress in the case of distal extension partial denture, devices like stress breakers are used.
  3. Type I = In this type, a movable joint is placed between the direct retainer and denture base.
  4. Type II  = This type consists of a flexible connection between the direct retainer and the denture base. 
  5. Advantages 
    1. Preservation of the alveolar support of abutment
      tooth due to the reduction of stress on it.
    2. Balanced stress on residual alveolar ridge and
      abutment.
    3. Weak abutment teeth are well splinted even when
      the denture base is moved.
    4. Even if relining is not done properly, abutment
      teeth are not damaged.
    5. Direct retention is less required.
    6. A massaging effect is produced on the soft tissues during the movement of the denture base.
    7. This lessens the need for frequent relining and rebasing.
  6. Disadvantages 
  • Complicated design and expensive.
  • Weak assembly and fractures easily.
  • It distorts due to rough handling.
  • It is difficult to repair.
  • It can counter only the vertical forces on the
    denture.
  • Reduced stability against horizontal forces.
  • Inappropriate relining leads to excessive ridge resorption.
  • Reduced indirect retention.
  • The split major connector tends to collect food
    debris at the area of split.

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