Dental Cements:
Dental Cements:
➢ Hard, brittle materials are formed by mixing powdered oxide or glass with a liquid
➢ Classified according to their properties and their intended uses in dentistry
, Primary Uses of Dental Cements:
1. To retain (cement) indirect restorations or appliances:
luting (like gluing)
2. To serve as a liner or base under a restorative filling
material
3. To serve as a temporary filling material
4. Cements are also used for specialized purposes in
endodontic (root canal sealers), orthodontic (cementation
of orthodontic bands), periodontal, and surgical fields
(surgical dressing)
Luting Cements (LC):
➢ Designed to be either permanent or temporary
➢ Acceptable thickness: 25 um to 120 um
Requirements for Permanent Luting Cements
Film thickness Around 25um
Minimum compressive strength: 70MPa
Water Solubility Less than 0.2 (wt.%)
Setting time Less than 10 minutes
Classification of Luting Cement:
1. Water-based
2. Resin-based
3. Oil-Based
Water Based Luting Cements:
1. Zinc Phosphate Cements
2. Zinc Polycarboxylate cements
3. Glass ionomer cement: GIC
4. Resin Modified GIC: RMGIC
1. Zinc Phosphate Cement:1878
➢ Oldest of the cementation agents
○ Has the longest track record
➢ Serves as a standard by which newer systems can be compared
➢ Composition:
○ Liquid: phosphoric acid in water buffered by aluminum and zinc ions
■ Aluminum and zinc ions = slow the setting reaction during mixing
○ Powder: Zinc Oxide, Magnesium Oxide, Pigments.
Types of Zinc Phosphate:
Type 1: Type 2:
- Fine grain - luting - Medium grain - base
Dental Cements:
➢ Hard, brittle materials are formed by mixing powdered oxide or glass with a liquid
➢ Classified according to their properties and their intended uses in dentistry
, Primary Uses of Dental Cements:
1. To retain (cement) indirect restorations or appliances:
luting (like gluing)
2. To serve as a liner or base under a restorative filling
material
3. To serve as a temporary filling material
4. Cements are also used for specialized purposes in
endodontic (root canal sealers), orthodontic (cementation
of orthodontic bands), periodontal, and surgical fields
(surgical dressing)
Luting Cements (LC):
➢ Designed to be either permanent or temporary
➢ Acceptable thickness: 25 um to 120 um
Requirements for Permanent Luting Cements
Film thickness Around 25um
Minimum compressive strength: 70MPa
Water Solubility Less than 0.2 (wt.%)
Setting time Less than 10 minutes
Classification of Luting Cement:
1. Water-based
2. Resin-based
3. Oil-Based
Water Based Luting Cements:
1. Zinc Phosphate Cements
2. Zinc Polycarboxylate cements
3. Glass ionomer cement: GIC
4. Resin Modified GIC: RMGIC
1. Zinc Phosphate Cement:1878
➢ Oldest of the cementation agents
○ Has the longest track record
➢ Serves as a standard by which newer systems can be compared
➢ Composition:
○ Liquid: phosphoric acid in water buffered by aluminum and zinc ions
■ Aluminum and zinc ions = slow the setting reaction during mixing
○ Powder: Zinc Oxide, Magnesium Oxide, Pigments.
Types of Zinc Phosphate:
Type 1: Type 2:
- Fine grain - luting - Medium grain - base
