CONSERVATIVE & ENDODONTICS

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Prevention of Microleakage

1)   Proper manipulation and its placement after cleaning tooth surface

2)   Use of rotary instruments over manual cutting for finishing margins.

3)   Coating of Varnish or petroleum jelly should be applied to protect rest. From moisture contamination

4)   Prior conditioning of tooth surface with weak acids.

5)   Resin modified GIC (rapid initial setting) but show more leakage as shrink during polymerization as compared to chemically cured ones.

 

Microleakage around Composite Restoration

  • Does not bond to tooth structure on its own.
  • Development of internal stresses from polymerization shrinkage and thermal changes also has detrimental effect on bond leading to gap formation and microleakage.
  • Acid etching, priming/conditioning and the use of enamel and dentin bonding agents necessary.
  • Enamel – Better bonding if sufficient enamel thickness is present.
  • Dentin – weaker bonding (vitality of the dentin, difference in physical and chemical composition of dentin compared to enamel, presence of dentinal fluid, smear layer and etc.)

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