Clinical Reference Guide
Choosing the Right Dental Cement
Dental cements are used in virtually every sector of clinical dentistry — from luting crowns and bridges to sealing root canals and placing temporary restorations. Understanding their classification, composition, properties, and risks is essential for every practitioner.
Do you need help making a decision? Jump to our Cement Selection Guide at the bottom of this article.
What Are Dental Cements?
Dental cements are materials specifically formulated for use in dental care. They serve multiple functions depending on their composition and clinical application. Some are used exclusively by dentists in clinical settings, others by dental technicians in laboratories, and many by both. They can be broadly classified into:
- Luting cements — for permanently or temporarily cementing crowns, bridges, inlays, onlays, and posts
- Restorative cements — used directly as filling materials, especially in primary teeth and ART procedures
- Lining and base cements — placed under restorations to protect the pulp
- Temporary cements — for short-term sealing of cavities and provisional restorations
- Endodontic cements — for root canal sealing and obturation
What Are the Different Types of Dental Cements?
Dental cements can be divided into four major categories based on their composition and mechanism of action:
1. Glass Ionomer Cement (GIC)
Composition: Alumino-silicate glass powder + polyacrylic acid liquid. Sets via an acid-base reaction between the glass and the acid.
How it works: GIC bonds chemically to calcium in tooth structure (enamel and dentine) without requiring a separate bonding agent. It continuously releases fluoride ions, which remineralise surrounding tooth structure and inhibit secondary caries.
- Chemical adhesion to tooth structure
- Sustained fluoride release & recharge
- Biocompatible, pulp-friendly
- No bonding agent required
- Tooth-coloured
- Cost-effective
- Moisture sensitive during initial set
- Lower compressive strength than resin
- Brittle — not for high-stress areas
- Surface must be protected post-placement
- Longer working & setting time
Clinical indications: Luting metal and PFM crowns, Class III/V restorations, primary tooth restorations, ART, liner/base under composites, orthodontic band cementation.
Forms available: Powder-liquid (hand mix), encapsulated (capsule delivery), pre-dosed mini packs.
2. Resin Modified Glass Ionomer (RMGI)
Composition: GIC base + HEMA (hydroxyethyl methacrylate) resin component. Sets via both acid-base reaction and light/chemical polymerisation.
How it works: The resin component provides immediate strength upon light-curing (tack cure), while the GIC component continues to set and release fluoride. Dual-cure mechanism gives the clinician more control and allows immediate excess removal.
- Higher retention than conventional GIC
- Tack light-cure — immediate excess removal
- Fluoride release maintained
- Lower solubility & better moisture resistance
- Good for metal, PFM & Maryland bridges
- Requires bonding agent in some protocols
- HEMA may cause pulpal sensitivity
- Not recommended for all-ceramic restorations
- Higher cost than conventional GIC
- Expansion on water absorption possible
Clinical indications: Luting metal crowns, PFM crowns, Maryland bridges, core build-ups, lining under composites.
3. Self-Adhesive Resin Cement
Composition: Bifunctional resin monomers (MDP phosphate monomer) + filler particles + initiator system. No separate bonding agent required.
How it works: The MDP monomer chemically bonds to hydroxyapatite in tooth structure and to metal oxides in zirconia. Dual-cure mechanism ensures complete polymerisation even in areas inaccessible to light.
- No bonding agent or etching required
- Excellent retention strength
- Dual-cure — reliable in deep preparations
- High colour stability
- Ideal for zirconia, all-ceramic & implants
- Fast mix time (20 seconds)
- Minimal to no fluoride release
- Higher cost
- Difficult to retrieve if needed
- Technique sensitive
- Post-op sensitivity possible
Clinical indications: Zirconia crowns & bridges, all-ceramic restorations, implant-supported crowns, fibre posts, inlays & onlays.
4. Zinc Oxide Eugenol (ZOE) / Temporary Cements
Composition: Zinc oxide powder + eugenol liquid. Sets via a chelation reaction forming zinc eugenolate.
How it works: ZOE cements are self-curing and moisture-activated. Eugenol has a sedative effect on the dental pulp, making these cements analgesic and soothing. Designed for temporary use and can be removed cleanly in one piece.
- Analgesic & pulp-soothing (eugenol)
- Antiseptic properties
- Easy one-piece removal
- Self-curing, moisture-activated
- Very economical
- Hermetic seal
- Not for permanent restorations
- Eugenol inhibits resin polymerisation — never use under composites
- Low mechanical strength
- Eugenol allergy possible
- Dissolves over time in oral fluids
Clinical indications: Temporary cavity sealing, provisional crown cementation, pulp capping (indirect), inter-appointment dressing.
Key Technical Characteristics of Dental Cements
When evaluating dental cements, clinicians should consider the following technical parameters:
| Property | GIC | RMGI | Self-Adhesive Resin | ZOE |
|---|---|---|---|---|
| Compressive Strength | Moderate | Moderate-High | Very High | Low |
| Film Thickness | ~15 µm | ~15–20 µm | ~15 µm | ~25 µm |
| Fluoride Release | High | Moderate | None/Minimal | None |
| Solubility | Moderate | Low | Very Low | High |
| Biocompatibility | Excellent | Good | Good | Good (temporary) |
| Bonding Agent Needed | No | Sometimes | No | No |
| Radiopacity | Yes | Yes | Yes | Variable |
| Colour Match | Good | Good | Excellent | White/Off-white |
Can Dental Cements Be Dangerous to Health?
While dental cements are generally safe when used correctly, there are several potential risks clinicians should be aware of:
- Pulpal irritation: Highly acidic cements can irritate the pulp in deep preparations. Always use a liner within 1mm of the pulp.
- HEMA sensitivity (RMGI): The HEMA monomer can cause pulpal sensitivity and, rarely, allergic reactions.
- Eugenol inhibition (ZOE): Eugenol inhibits resin polymerisation. Never place composite directly over ZOE.
- Eugenol allergy: Use eugenol-free alternatives when allergy is suspected.
- Excess cement: Subgingival excess — especially around implants — is a leading cause of peri-implantitis.
- Microleakage: Improper mixing or contamination can compromise the cement seal.
📋 Cement Selection Guide
| Clinical Situation | Recommended Cement | Reason |
|---|---|---|
| Metal / PFM crown | GIC or RMGI | Fluoride release, adequate retention |
| Zirconia / All-ceramic crown | Self-Adhesive Resin | Highest retention, colour stability |
| Implant-supported crown | Self-Adhesive Resin (retrievable) | Strong bond, minimal excess risk |
| Primary tooth restoration | GIC | Fluoride release, biocompatible |
| Temporary restoration | ZOE (Cavit-G) | Easy removal, pulp soothing |
| Liner under composite | GIC or RMGI (eugenol-free) | Fluoride, no resin inhibition |
| Caries-prone patient | GIC (high fluoride release) | Remineralisation & caries prevention |
| Fibre post cementation | Self-Adhesive Resin | Maximum retention in root canal |
🛒 View Dental Cements on KedarCart
Authentic 3M ESPE, GC Corporation & more — verified expiry dates, worldwide shipping from India.
0 comments