| Objectives | * Provide an adequate seal. | |
| * Retain the provisional restoration. | |
| * Allow for easy and safe removal of the restoration. | |
| * Have minimal solubility. | |
| * Be biocompatible with the pulp and gingiva. | |
| * Be compatible with provisional materials and tooth structure. | |
| * Have adequate handling, working, and setting times. | |
| | |
| Types of Cement | * Zinc-oxide eugenol (ZOE) cement (e.g., Tempbond). This is noted as the most commonly used. | TEMPBOND and TEMPBOND CLEAR |
| * Eugenol-free cement. | |
| * Polycarboxylate cement (noted as a harder cement). | |
| * Tempbond Clear (noted as an aesthetic option). | |
| | |
| Key Clinical | * The Eugenol Issue: Eugenol can inhibit the polymerization (setting) of permanent resin cements. | |
| Considerations | * Eugenol can also act as a plasticizer, potentially affecting methacrylate resins and composite cores. | |
| * Due to this interaction, a eugenol-free cement should be used if the final restoration will be bonded with a resin cement. | |
| * Cement Strength: High-strength cements should generally be avoided, as removal can damage the tooth or restoration. | |
| * The strength of ZOE can be reduced by adding petroleum gel. | |
| * Indications for Stronger Cement: May be needed for preparations with poor retention, long-span provisionals, or patients with parafunctional activities (e.g., grinding). | |
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| Application | 1. Mix the base and activator. | |
| Procedure | 2. Apply a small, thin quantity inside the crown, just short of the margins. | |
| 3. Seat the crown and hold it tightly (or ask the patient to bite on a cotton roll). | |
| 4. Remove excess cement with an explorer once it reaches a rubbery stage. | |
| 5. Use dental floss to clear the interproximal contacts and embrasures. | |
| 6. Ensure no cement is left in the gingival sulcus. | |
| 7. Check and adjust the occlusion after cementation. | |