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By Dr. Aamir Mehmood Butt, Assistant Professor Deptt: Of Prosthodontics LUMHS, Jamshoro

Denture Relining & Rebasing. By Dr. Aamir Mehmood Butt, Assistant Professor Deptt: Of Prosthodontics LUMHS, Jamshoro. Denture Relining. Definition :

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By Dr. Aamir Mehmood Butt, Assistant Professor Deptt: Of Prosthodontics LUMHS, Jamshoro

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  1. Denture Relining & Rebasing By Dr. Aamir Mehmood Butt, Assistant Professor Deptt: Of Prosthodontics LUMHS, Jamshoro

  2. Denture Relining • Definition: “ procedure used to resurface the tissue side of a denture with new base material, producing an accurate adaptation to the denture foundation area” ( GPT 2005)

  3. Indications 1.Resorption of the bone could leads to: • Loss of retention & stability • Loss of VD • Loss of support of facial tissues • Incorrect occlusal relationship • Immediate denture after 3 -to - 6 months of construction. • Economics • Geriatric or chronically ill pt: • Time problem • Loose denture at the time of delivery

  4. Contra- Indications • Poor quality of denture base • Exaggerated bone resorption • Abused or traumatic oral tissues • Poor teeth arrangement • Unsatisfactory jaw relationship • Speech problem • Undercuts • TMJ problems.

  5. Relining Materials • According to time: • Short–term liners example: tissue conditioners, preformed sheets of acrylic gel. b long-term liners • plasticized acrylic( heat & chemical activated forms are available) • Heat activated silicones • RTV ( room temperature vulcanization ) silicones • Plasticized vinyl polymers & copolymers • Hydrophilic polymers • Polyphosphazine fluoropolymers • Fluoroethylene • PVS

  6. Relining Materials • According to type of Activation • Heat activation • Chemical activation

  7. Uses of short-term liners • Treatment & conditioning of abused oral & supporting tissues. • Diagnostic purposes such as recovery of VD. • Temporary relining of immediate denture/ surgical splints/ cleft palate speech aids etc. • Tissue conditioning during implant healing. • Functional impression material.

  8. Qualities of an ideal long-term reliner • Biocompatibility • Dimensional stability • Low water sorption & solubility • Low surface tension • Permanent softness • Abrasion resistance • Good bond to denture base material • Simple to manipulate • Color stability • Resist microorganisms growth

  9. Comparison of plasticized acrylic versus silicon rubber • PLASTICIZED ACRYLIC: • Less resilient • Hardens by time • Good bonding with base material • Acceptable tear resistance • Better abrasion resistance • Resistance to damage by denture cleansers

  10. Comparison of plasticized acrylic versus silicon rubber • SILICONE RUBBER: • Highly resilient • Poor bonding to acrylic denture base • More water sorption • More susceptibility to microorganism growth • Low tear & abrasive resistance • Less resistance to damage by denture cleansers

  11. REBASING • DEFINITION: “ The laboratory procedure of replacing the entire denture base material on an existing prosthesis” (GPT 2005)

  12. Indications • Where the observed clinical changes are moderate to sever. • Some processing fault in denture base e.g: porosity • Discoloration of base material. • Where porcelain teeth have been used.

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