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Precision attachment, 截圖 2023-04-29 下午2.01.36, 截圖 2023-04-29 下午2.02.00, 截圖…

- - - - Also known as Interlocks
      - Mainly for joining different sections of fixed prosthesis.
      - Provide vertical stabilization & support
    - - used for overdenture retention (full denture)
      - It consist in an stud soldered to a post 螺柱焊接到post上 (cemented in a RCT root) that clips into a flexible ring (embedded in the resin of a denture)
      - The clip or the stud should be placed once they are no linger resilient
      - The size of the stud (ball) should meet with the verticle dimension avalaible, so that construction of artificial teeth could be done
    - - retangular (box-block): friction can be increased
      - A slit: in the male part: be widened with a scalpel Blade, increasing retention(Mccollum or Crismani)
      - Succumb屈於to fatigue & the male (embedded in denture) need replacement
      - Minimum of 2.5mm of height
    - - A device which parts lock rapidly together (T-block attachment)
      - Minimun of 6mm requrired
    - - The plunger can be replaced
      - Require from 4-5mm of height
      - A spring protrudes a plunger rod that engages to depression in the box
- - - - Pin and tube joints or multiple pin-tubes-slots.
      - Require the use of teeth with strong periodontal support, and should be entirely supported by teeth
      - Denture becomes a rigid extension of cantilever.
      - Excellent retention.
      - Movement only occurs during insertion of denture
    - - The rigid could provoke tilting &periodontal destruction, these attachments were developed to allow rotation and resilience within the joints, and therefore reduce the torque over abutment teeth
      - Resilient
        
        Dalbo stress breaker attachment with an spring within the body of the socket that allows a small amount of verticle setting beside the abutment teeth.
        
        Crismani attachment has also a modification in which and spring is available at the bottom of the box
      - Rotated
        
        Hinges that allow prosthesis to rotate around an horizontal axis transmitting the forces to the residual ridge.
        
        Dalbo attachment is a good example of ball-socket joint