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只留下sound structure的牙齒 (評估下還剩多少ferrule (大於2mm (後牙 (3 wall以上 (直接build up),…

- - - - 堪用(C/R ratio還有1:1)
      - 不堪用
        
        拔掉
  - - - 直接build up(不用crown)
      - post needed
        
        normal canal
        
        parapost
        
        ovoid canal (像canine)
        
        casting post
    - - 3 wall以上
        
        直接build up
      - 2/3 wall
        
        parapost
      - 2 wall以下（最後殺招）
        
        casting post