The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

1. VARNISH, LINERS, and BASESVARNISH, LINERS, and BASES
INDIAN DENTAL ACADEMY
Leader in continuing Dental Education
© 2006, Bayne and Thompson
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2. OVERVIEWOVERVIEW
OF PULPAL PROTECTIONOF PULPAL PROTECTION
1.1. CHEMICAL ProtectionCHEMICAL Protection
2.2. PULPAL MedicationPULPAL Medication
3.3. THERMAL / ELECT ProtectionTHERMAL / ELECT Protection
4.4. MECHANICAL ProtectionMECHANICAL Protection
PROBLEM = No perfect replacement for missing enamel and dentin.PROBLEM = No perfect replacement for missing enamel and dentin.
1.1. SOLUTION LINER = thin film (varnish, bonding system, dentin sealer)SOLUTION LINER = thin film (varnish, bonding system, dentin sealer)
2.2. Suspension Liner (20-25Suspension Liner (20-25 µµm)m)
3.3. CEMENT LINER = medium thickness (100-500CEMENT LINER = medium thickness (100-500 µµm)m)
4.4. CEMENT BASE = thick (500-1000CEMENT BASE = thick (500-1000 µµm)m)
NORMAL
RESTORED
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3. PULPALPULPAL
PROBLEMS:PROBLEMS:
 Fluid FlowFluid Flow
 MicroleakageMicroleakage
FLUID FLOW = J = (P) (FLUID FLOW = J = (P) (rr44
) / (8) () / (8) (ηη) () (ll))
Occlusion ofOcclusion of
tubulestubules
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4. CHEMICAL PROTECTIONCHEMICAL PROTECTION
DEFINITIONS:
Varnish = thin film solution liner (hydrophobic)
Suspension liner = thin film aqueous liner (hydrophilic)
Bonding system = thin film solution liner (hydrophilic)
Dentin sealer = thin film solution liner (hydrophilic)
COPALITECOPALITE = 90% solvent + 10% copal resin
• Hydrophobic and does not wet dentin well.
• Requires 2 applications for 85% coverage.
• Thin coats work best.
Copalite
Smear Layer on Dentin
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5. DENTIN
FUNCTIONS:
 Chemical ProtectionChemical Protection
 Thermal / Electrical ProtectionThermal / Electrical Protection
 Biological Protection (Biological Protection (MedicationMedication))
 Mechanical ProtectionMechanical Protection
PULPALPULPAL
PROBLEMS:PROBLEMS:
 Fluid FlowFluid Flow
 MicroleakageMicroleakage
PULPAL MEDICATIONPULPAL MEDICATION
(Biological Protection)(Biological Protection)
RDTRDT
11º Dentinº Dentin
22º Dentinº Dentin
3º Dentin3º Dentin
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6. DENTIN
FUNCTIONS:
 Chemical ProtectionChemical Protection
 Thermal / Electrical ProtectionThermal / Electrical Protection
 Biological Protection (Biological Protection (MedicationMedication))
 Mechanical ProtectionMechanical Protection
PULPALPULPAL
PROBLEMS:PROBLEMS:
 Fluid FlowFluid Flow
 MicroleakageMicroleakage
PULPAL MEDICATIONPULPAL MEDICATION
(Biological Protection with Eugenol or Calcium Hydroxide)(Biological Protection with Eugenol or Calcium Hydroxide)
and ZnO ( Zn++)
• pH = 11.0pH = 11.0
• Low strengthLow strength
• Ca ion + salicylateCa ion + salicylate
Ca(OH)2 StimulatingStimulatingEugenol
PalliativePalliative
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7. THERMAL PROTECTIONTHERMAL PROTECTION
Intraoral HEAT FLOW:Intraoral HEAT FLOW:
Normal thermal transient = 30-60s at 5-60Normal thermal transient = 30-60s at 5-60°°CC
HEAT paths = through restoration or via microleakageHEAT paths = through restoration or via microleakage
Pulpal temperature = f ( TIME, TEMP,Pulpal temperature = f ( TIME, TEMP, THICKNESSTHICKNESS ))
ThroughThrough
restoration:restoration:
Thermal ConductivityThermal Conductivity Thermal DiffusivityThermal Diffusivity
AroundAround
restoration:restoration:
Thermal ExpansionThermal Expansion
RDTRDT
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8. MECHANICAL PROTECTIONMECHANICAL PROTECTION
PROTECTION = 1-2 mm (1000-2000PROTECTION = 1-2 mm (1000-2000 µµm)m)
> Chemical Protection (Sealed tubules)> Chemical Protection (Sealed tubules)
> Biological Protection (Pulpal Medication)> Biological Protection (Pulpal Medication)
> Thermal / Electrical Protection (1-2 mm)> Thermal / Electrical Protection (1-2 mm)
> Mechanical Protection (BASE = 1-2 mm)> Mechanical Protection (BASE = 1-2 mm)
RMGIRMGI
PolycarboxylatePolycarboxylate
Zinc PhosphateZinc Phosphate
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9. BASESBASES
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10. COMMERCIAL EXAMPLESCOMMERCIAL EXAMPLES
of Varnishes, Liners, and Basesof Varnishes, Liners, and Bases
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11. PROCEDURE SUMMARYPROCEDURE SUMMARY
forfor Medicament, Liner/Base, Varnish/Sealer/DBSMedicament, Liner/Base, Varnish/Sealer/DBS
RDT =
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