RELINING AND REBASING 4M** 2M***

  1. Mc reason = bone resportion occurs as denture takes support from bone and tissue = after some time = denture will become loosely fit
  2. Only done when occlusal contacts are proper 
  3. RELINING = 
    1. Tissue changes are minimum 
    2. It means to resurface the tissue surface of denture to improve FIT 
  4. Rebasing 
    1. Tissue changes are maximum 
    2. Extreme version of relining 
    3. More material is needed for refitting 
  5. If both maxilla and mandible needs reline or rebase 
    1. Maxillary procedure is done first 
    2. Cause Max denture maintains the occlusion plane
  6. RELING PROCEDURES
CLINICALLAB
STATIC = open or closedFunctional relineChairsideArticulator methodJig method Flask method 
  1. OPEN MOUTH TECHNIQUE
    1. Given by boucher 
    2. Impressions made independently 
    3. Max and mand impression separately 
    4. Not using any existing occlusion
    5. Denture of the pt= used as impression tray 
    6. Material = ZnOE
  2. CLOSED MOUTH 
    1. Impression material is placed on intalglio surface of denture 
    2. Place in pt mouth
    3. Ask pt to bite = functional pressure while recording 
    4. Problem
      1. It doesnt record tissues at rest 
      2. How to determine the amount of pressure needed? Pt is biting and pt doesnt know how much pressure to be applied = Pressure variation 
      3. Impression material might move before the material sets
      4. Hence, Lab remounting of denture become extremely necessary  
  3. FUNCTIONAL METHOD
    1. Dentures are not sent to the lab 
    2. Soft liner or tissue conditioner is used as impression materials
    3. After 3- 5 days of using soft liner = you take Final impression is when there is ABSOLUTE NO INJURIES = soreness and ulcers are healed in the pt
    4. Chairside = acrylic chemical cure must not be used = they might burn mucosa due to heat generation 
  4. SOFT LINERS/ TISSUE CONDITIONERS
    1. Shock absorber 
    2. This shock is energy transmitted to the denture bearing areas or ridge during mastication 
    3. Short term soft liner 
      1. is called TISSUE conditioner  2m***
      2. Self curing or chemical cure 
      3. After 7 days, you MUST remove the material 
      4. It will absorb and interact with saliva 
      5. Hence, it will loose its property of elasticity 
    4. Plasticized acyrlic = 
      1. long term soft liner 
      2. Good bond between acyrlic denture and acylic liner
    5. Silicone elastomers
      1. No acyrlic 
      2. Rubber base material 
      3. Adv = good tissue adaptation 
      4. Doesnt form Good bond with acyrlic denture
      5. More prone to fungal infections  

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