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Cementation is one of the final steps in the sequence of clinical procedures for indirect restorations.
molecular interactions between a substrate (adherend) and an adhesive brought into close contact, creating an adhesive joint
Headings
to help retain the restoration in place
maintain the integrity of the remaining
tooth structure
-friction (or micromechanical interlocking)
-by an adhesive joint consisting of the prepared tooth, the cement, and the
restoration
-or a combination of both mechanisms
-easy to use
-good long-term clinical service
-Some release fluoride
and bond to tooth structures
-based on resin composites
-high bond strengths
-better mechanical properties
-more technique sensitive
The most basic aspect the cleanliness of the substrate
Saliva, biofilm, and other organic debris
The walls of a cavity preparation smear layer
All reduce the surface energy of the substrate and, consequently, its wettability
-For both temporary cementation and permanent fixation of metallic and metalloceramic crowns and bridges
-neutral pH
-antibacterial action
-low strength Temporary
calcium fluoroaluminosilicate glass
-the most popular materials for permanent cementation
-good physical properties
-adhere to the tooth structure and metals
-release significant amounts of fuoride
bacteriostatic
resistance of enamel and dentin
-it is extremely important to protect the cement against gain and loss of water
during the first 24 hours
-Bonding to tooth structures is one of the main characteristics of glass ionomers
-Its mechanical properties are superior to other acid-base cements and increases significantly over long periods
Resin-modified Glass Ionomer
-an acid-base and a polymerization reaction.
poly(acrylic acids) modified with pendant methacrylate groups
Initiators for the light-cured polymerization
-does not show the early sensitivity to moisture conditions
-
-In vitro fluoride release by conventional and resin-modified luting glass ionomers was found to be similar
-Water uptake higher compared to resin cements
-Solubility in water is also higher compared to resin cements
-class 1 (self-cured),
class 2 (light-cured)
or class 3 (dual-cured)
-similar composition to that of restorative composites
-higher filler levels and higher conversion
correspond to higher mechanical properties
-simple application procedure
-combining the advantages of glass ionomers (adhesion, fluoride release) with mechanical properties comparable to those of resin cements
-higher cytotoxicity than resin cements and acid-base cements
What kind of a cement is this?
How should we prevent the GI from over drying or moisture in the first 24 hours?