Impression Materials

Description

First Year Dentistry Mind Map on Impression Materials, created by sanna pathy on 04/03/2020.
sanna pathy
Mind Map by sanna pathy, updated more than 1 year ago
sanna pathy
Created by sanna pathy over 4 years ago
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Resource summary

Impression Materials
  1. Properties
    1. Viscosity
      1. High = less detail & mucocompressive
        1. Putty
          1. Heavy bodied addition silicone
            1. Compound
            2. Low = more detail & mucostatic
              1. Alginate
                1. ZOE
                  1. Light bodied silicone
                2. Elasticity
                  1. Elastic = can be removed past undercuts
                    1. Light bodied silicone
                      1. Alginate
                      2. Non-elastic = cannot be removed past undercuts or is permanently deformed when it does
                        1. Compound
                          1. ZOE
                        2. Dimensional stability
                          1. Unstable
                            1. Alginate
                              1. Compound
                              2. Stable
                                1. Addition silicone
                                  1. ZOE
                              3. Compound
                                1. Types
                                  1. Sheet form
                                    1. C/C & P/P Primary imps
                                    2. Greenstick
                                      1. C/C Major imps
                                        1. Tray modifications
                                      2. Thermoplastic setting
                                        1. Hard at mouth temp.
                                          1. Soft at 55-60°C
                                          2. Advantages
                                            1. Muco-compressive
                                              1. Easily modified/added to
                                                1. Short ST
                                                2. Disadvantages
                                                  1. Can't record undercuts
                                                    1. Low detail
                                                      1. Dimensionally unstable
                                                        1. Pour cast within 1hr
                                                    2. ZOE
                                                      1. C/C Major Imps
                                                        1. Chelation acid base reaction (ionic)
                                                          1. Pseudoplastic = less viscous when pressure applied
                                                            1. Advantages
                                                              1. Fine detail
                                                                1. Hydrophilic
                                                                  1. Dimensionally stable
                                                                    1. Easily modified/added to
                                                                    2. Disadvantages
                                                                      1. Can't record undercuts
                                                                        1. Mucostatic - must be supported by tray
                                                                          1. Can cause burning sensation
                                                                            1. Xerostomia
                                                                        2. Alginate
                                                                          1. Irreversible hydrocolloid
                                                                            1. Use
                                                                              1. P/P Primary & Major imps
                                                                                1. Study models
                                                                                  1. C/C Primary imp w/ flabby ridge/bony undercuts
                                                                                  2. Setting reaction = Sol to Gel
                                                                                    1. Advantages
                                                                                      1. Fine detail
                                                                                        1. Easiest to remove from undercuts
                                                                                          1. Hydrophilic
                                                                                            1. Cheap
                                                                                            2. Disadvantages
                                                                                              1. Dimensionally unstable on storage
                                                                                                1. Imbibition
                                                                                                  1. Syneresis
                                                                                                  2. Low tear strength
                                                                                                    1. Requires adhesive & perforated tray
                                                                                                  3. Silicones
                                                                                                    1. Use
                                                                                                      1. C/C Major imp
                                                                                                        1. Light bodied
                                                                                                        2. Crowns & Bridges
                                                                                                          1. Light & Heavy bodied/Putty
                                                                                                          2. Denture adjustments
                                                                                                            1. Light bodied
                                                                                                          3. Addition silicone = Polyvinylsiloxane
                                                                                                            1. Addition (cross-linking) reaction
                                                                                                              1. Platinum catalyst
                                                                                                              2. Heavy bodied
                                                                                                                1. More stable
                                                                                                                  1. Less detail
                                                                                                                  2. Light bodied
                                                                                                                    1. Fine detail
                                                                                                                    2. Putty
                                                                                                                      1. Most stable
                                                                                                                        1. Least detail
                                                                                                                      2. Advantages
                                                                                                                        1. High tear strength
                                                                                                                          1. Records undercuts
                                                                                                                            1. Fine detail
                                                                                                                              1. Light bodied
                                                                                                                              2. Dimensionally stable
                                                                                                                              3. Disadvantages
                                                                                                                                1. Hydrophobic
                                                                                                                                  1. Expensive
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