Cements and bonding is one of the most dry, boring subjects in Dentistry but it is incredibly important! If you can't bond effectively then your restorations will fail.
Thankfully, this document has done all the hard work for you and summarises everything you need to know, as a dental student, o...
Bonding and Cements
Contents
• Zinc Oxide Eugenol
• Zinc Phosphate
• Zinc Polycarboxylate
• Glass ionomer cement
• Resin-luting cement
• RMGIC
• What material to use
• Bonding to metals
• Bonding to ceramics
Zinc Oxide Eugenol
Advantages:
• Anti-inflammatory properties
• Cheap
Disadvantages:
• Weakest cement
• Does not bond to tooth tissue
• Direct contact with pulp can cause necrosis
Indications:
• Temporary Restorations
• Base
• Temporary luting of restorations
• Endodontic sealer
• Impression material
Contraindications:
• Temporary restorations in non-retentive cavities
• Direct placement on exposed pulp
• Luting agent unde resin-containing materials
Examples:
• Temp Bond (Kerr) - temporary crowns and bridges
• IRM (Dentsply) - IRM Intermediate Restorative material is designed for restorations
intended to remain in place for up to one year. Indications - Emergency placement
, prior to complete treatment, endo access openings, pedo teeth that will soon exfoliate,
and caries management programs
Zinc Phosphate
Advantages:
• Acceptable mechanical properties
• Cheap
• Good long term stability
Disadvantages:
• Acidic when setting - can cause post-cementation sensitivity
• Soluble
• No molecular adhesion - friction only
Indications:
• Definitive cementation of inlays, metal crowns and bridges and orthodontic bands
• As a base
Contraindications:
• Definitive cemention of ceramic crowns and bridges
• Base when in close proximity to the pulp
Zinc Polycarboxylate
Advantages:
• Bonds to tooth
• Acceptable mechanical properties
• Cheap
Disadvantages
• Difficult to mix
• Soluble in mouth
• Opaque
Indications:
• Temporary Restorations in non-retentive cavities or with an inflammed pulp
• Bases
• Definitive luting of metal/metal ceramic crowns and orthodontic browns
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