Denture Lining Material PDF

# Denture Lining Material ## Definition They are very soft material that added to fitting surface of denture to act as cushion. ## Types - Tissue conditioner - Soft liner (acrylic / rubber) ## Soft Liners ### Uses - Knife-edge ridge covered by thin mucosa - Mucosa - very thin (inadequate thi...

# Denture Lining Material ## Definition They are very soft material that added to fitting surface of denture to act as cushion. ## Types - Tissue conditioner - Soft liner (acrylic / rubber) ## Soft Liners ### Uses - Knife-edge ridge covered by thin mucosa - Mucosa - very thin (inadequate thickness) - Patient who has bruxism or clenches his teeth - Denture patient problem is psychological (not tolerate hard denture) ### Requirement - Resilient - Dimension stable - Adhere to denture base - Color stability - Good rupture properties ### Classification - **Reaction:** Gelation reaction (physical reaction) as solvent volatile evaporation & leave Polymer gel - **Manipulation:** Mouth-cured or chair side technique - **Properties:** Hardness is Very low (softest of resilient liners) flowable & get excellent details, no reaction with tissue (good biological effect), weight Loss (evaporation of solvent), dimension change is less than 2%, material lose its resiliency after 5 days due to losing plasticizer so it must be replaced ## Tissue Conditioner ### Definition Resilient liner act as (temporary cushion) to prevent masticatory loads to transfer to underlying tissue. ### Uses - After surgery (reduce pain) "surgical pack" - Functional impression - Treatment of irritated denture-bearing mucosa ### Composition - Powder (ethyl methacrylate polymer) (no initiator) - Liquid aromatic ester & ethyl alcohol & butyl Phthalate (plasticizer) - It is solvent liquid not monomer ### Reaction Gelation reaction (physical reaction) as solvent volatile evaporation & leave Polymer gel ### Manipulation Mouth-cured or chair side technique ### Properties - Hardness is Very low (softest of resilient liners) - Flowable & get excellent details - No reaction with tissue (good biological effect) - Weight Loss (evaporation of solvent) - Dimension change is less than 2% - Material lose its resiliency after 5 days due to losing plasticizer so it must be replaced ### Classification - **Temporary:** One month P/L - **Permanent:** (6-7 months) P/L ### Requirement - Compatible with tissue - Easy in processing - Low water sorption ## Classification | | Cold cure | Heat cure | |---|---|---| | **Soft liner** | **Acrylic** | **Rubber** | | **Temporary** | Plasticized | Permanent (6-7 months) Paste (silicone) catalyst (liquid) | | **Permanent** | Permanent (6-7 months) | Permanent (6-7 months) Single paste (vinyl terminated silicone polymer) | ### Requirement - **Permanent:** (few weeks or month) - **Temporary:** (4-7 month) ### Chair Side Lab Replaced due to lose plasticizer ### Lab Replaced due to water sorption & fungal growth All soft liners are permanent to patient but change after time