Dental Cement for Crowns: Which Material to Use and When

Selecting the right dental cement for crowns is one of the most consequential decisions in restorative workflow, yet it is frequently made by default rather than by indication. The cement class determines the retention mechanics, the risk of post-operative sensitivity, the retrievability of the restoration, and, critically, whether the marginal seal will hold over the long term.

This article covers the four main cement classes used for permanent crown cementation, the clinical evidence on retention and failure rates, crown-specific selection criteria, and procurement considerations. For a comprehensive comparison across all cement categories in restorative dentistry, see our complete guide to dental cements for restorative practice.

The Four Cement Classes for Crown Cementation

Based on articles retrieved from PubMed, a 2022 review in Dentistry Journal by Leung et al. (PMID 36354653) classifies permanent luting materials into four categories for fixed prosthodontics, each with distinct chemical mechanisms and clinical profiles.

Zinc phosphate cement is the oldest class in continuous clinical use, with over a century of evidence behind it. It bonds through mechanical interlocking rather than chemical adhesion, relying on preparation geometry to generate retention. Setting reaction produces phosphoric acid, which causes a transient pH drop at the pulp interface and is the primary driver of post-cementation sensitivity in vital teeth. Despite its age, it remains a clinically defensible option for high-retention metal and PFM crown preparations where retrievability is a consideration.

Glass ionomer cement (GIC) and resin-modified glass ionomer (RMGI) bond through a combination of mechanical interlocking and ionic interaction with the calcium ions in dentin and enamel. They release fluoride throughout their service life, providing some cariostatic effect at the crown margin, and generate less pulp irritation than zinc phosphate during setting. RMGI formulations add a light-cured resin component that improves early strength and handling.

Resin cement provides the highest bond strength of any class through micromechanical and chemical adhesion to both the tooth surface and the internal surface of the restoration. It is the mandatory choice for all-ceramic, zirconia, and lithium disilicate crowns, where it is the only cement class capable of generating clinically adequate retention without relying on preparation geometry alone. A 2023 review in Polymers by Maletin et al. (PMID 37896400, DOI: 10.3390/polym15204156) identifies resin cements as the preferred option for polycrystalline ceramic restorations, where a durable adhesive bond between the ceramic and tooth structure is essential to clinical success.

Bioactive hybrid cements (calcium aluminate plus glass ionomer) represent a newer class. A prospective clinical study by Jefferies et al. (2013, Compendium of Continuing Education in Dentistry, PMID 23577551) followed 38 crowns and bridges in 17 patients for 3 years and reported no loss of retention, no secondary caries, no marginal discoloration, and a reduction in mean tooth sensitivity VAS from 7.63 mm at baseline to 0.00 mm at the 2- and 3-year recall. The clinical data are promising but limited by small sample size and absence of randomization.

Retention Evidence: What the Data Shows

The retention hierarchy across cement classes is well established in the laboratory literature, though translating in vitro results to clinical predictions requires caution. A systematic review by Heintze (2009, Dental Materials, PMID 19931901, DOI: 10.1016/j.dental.2009.10.004) pooled 18 crown pull-off studies and found that resin cements (Panavia, RelyX Unicem) consistently produced the highest retention values, followed by glass ionomer and then zinc phosphate, with the difference between glass ionomer and resin-based materials statistically significant at p<0.05 when data were pooled and normalized.

Preparation geometry was identified as the most important modifier: stump height and convergence angle had a greater influence on crown retention than the cement class in many scenarios. This finding reinforces the principle that cement selection is most critical when preparation geometry is suboptimal.

A split-mouth RCT by Jokstad (2004, International Journal of Prosthodontics, PMID 15382776) followed 39 pairs of metal-ceramic and Procera crowns cemented with either zinc phosphate or RMGI for up to 102 months in 20 patients. Estimated survival at 102 months was 89% overall, with no statistically significant difference between the two cement groups. The study concluded that RMGI was at least equivalent to zinc phosphate over an 8.5-year observation period, which remains one of the longer clinical follow-ups in the crown cementation literature.

A controlled laboratory study by Tuntiprawon (1999, Journal of Prosthetic Dentistry, PMID 9922426) compared zinc phosphate, glass ionomer (Fuji Cap I), and resin cement (Panavia 21) on premolar preparations with varying surface roughness. Two-way ANOVA showed statistically significant differences in retention for both cement class and surface roughness (p<0.001). Panavia 21 with coarse diamond preparation delivered the best retention, while neither GIC nor zinc phosphate showed benefit from surface roughness in the same predictable pattern.

Crown-Specific Cement Selection: A Clinical Decision Framework

The correct dental cement for crowns is determined by three factors: the restoration material, the preparation geometry, and the pulp status.

Full-metal and PFM crowns on teeth with adequate preparation geometry (stump height above 3 mm, convergence angle 10 to 20 degrees) can be reliably cemented with RMGI cement as the default. The 102-month RCT data from Jokstad (2004) supports this choice. Zinc phosphate remains appropriate when retrievability is a specific goal or when practice protocol calls for it, with the caveat of higher post-cementation sensitivity risk on vital preparations.

All-ceramic crowns (lithium disilicate, zirconia, feldspathic) require resin cement. This is not a preference but a materials science requirement: these restoration types lack the preparation-dependent mechanical retention of metal crowns, and their bond to tooth structure depends on the adhesive interface generated by the resin cement system. For zirconia specifically, surface treatment of the intaglio surface (sandblasting, MDP primer application) is required before resin cementation to activate the chemical bonding mechanism.

Crowns on short preparations or conical preparations should be cemented with resin cement regardless of restoration material, because mechanical retention from geometry is insufficient to compensate for a lower-retaining cement class.

Non-vital teeth with reduced proprioceptive feedback increase the risk of overload on the cemented crown. Resin or RMGI cement is preferred in these cases over zinc phosphate, because the chemical adhesion component provides retention that does not depend entirely on the occlusal load being distributed across a well-designed preparation.

Crowns on implant abutments follow a different logic: retrievability is a clinical priority for implant-supported restorations to allow future access to the implant. Here, a eugenol-free temporary or provisional cement with controlled retention, rather than a permanent adhesive cement, is frequently the preferred strategy.

Step-by-Step Cementation Protocol for RMGI and Resin Cements

The following protocol covers the permanent cementation of a single crown with RMGI cement. Resin cement protocols require additional steps for dentin conditioning and adhesive application per manufacturer instructions and are briefly addressed below.

1. Provisional removal and cleanup. Remove the provisional restoration and clean the preparation with pumice slurry on a rubber cup. Rinse thoroughly and dry lightly. If a ZOE provisional cement was used, check that no eugenol residue remains before proceeding to resin cementation: eugenol contamination will reduce bond strength.
2. Crown try-in. Verify seating, margins, occlusion, and interproximal contacts without cement. Make all adjustments at this stage. For zirconia and all-ceramic crowns, inspect the intaglio surface and apply surface treatment protocol if required by the cement manufacturer.
3. Isolation. Achieve adequate hemostasis at the gingival margin before cementation. Subgingival margins are the most common source of contamination-related marginal failure.
4. RMGI mixing and loading. Dispense and mix the RMGI cement per manufacturer instructions and load the internal surface of the crown. Apply a thin, even coat and avoid excess material at the margins.
5. Seating. Seat the crown with firm, sustained pressure and hold for the duration of the initial setting phase. Ask the patient to bite on a cotton roll to ensure full seating. Do not release pressure until the cement has reached working set.
6. Excess removal. Remove marginal excess at the rubbery stage before full hardness for RMGI cements. For dual-cure resin cements, tack-cure excess for 1 to 2 seconds to stiffen it before removal, then proceed with full cure.
7. Final check. Verify occlusion under articulating paper with the patient in the upright position. Confirm with dental floss that interproximal contacts are clean.

Advantages and Limitations by Class

Zinc phosphate offers a long track record, reliable compressive strength, and straightforward handling. Its limitations are the acid-mediated pulp irritation, lack of chemical adhesion, and higher post-cementation sensitivity in vital teeth compared to GIC-based alternatives.

RMGI provides fluoride release, lower post-cementation sensitivity, and chemical adhesion to dentin without the technique sensitivity of resin cement. Its limitation is lower bond strength relative to resin cements for low-retention preparations and all-ceramic restorations.

Resin cement delivers the highest retention and is essential for ceramic restorations, but it requires the most precise technique: dentin preparation, adhesive application, isolation, and exposure control are all critical to achieving the bond strength documented in laboratory studies. Retrievability is limited once the restoration is fully bonded.

Bioactive hybrid cements offer favorable biocompatibility and clinical results in the available data, but the evidence base is smaller than for the established classes. They are an option where post-cementation sensitivity on vital teeth is a consistent clinical concern.

Procurement Considerations

The dental cement for crowns category encompasses several product lines at different price points, and the purchase price per kit varies significantly by distributor, account tier, and product generation. RMGI cements such as RelyX Luting Plus (3M) and Fuji PLUS (GC America) typically list at $55 to $90 per kit. Resin cements including RelyX Ultimate (3M) and Panavia V5 (Kuraray) range from $90 to $160 per kit. Zinc phosphate cements remain the most affordable option at $25 to $45 per powder-liquid kit.

For practices cementing a high volume of all-ceramic restorations, resin cement represents one of the higher per-unit consumable costs in the restorative supply category. Comparing prices across vendors before placing orders in this segment captures meaningful savings at practice scale.

Alara's platform compares pricing on the full dental cement category, including all RMGI and resin cement product lines, across 15+ verified vendors in real time. Your practice sees the best available price on every order without manual price checks or negotiation.

References

1. Leung GK, Wong AW, Chu CH, Yu OY. Update on Dental Luting Materials. Dent J (Basel). 2022;10(11):208. PMID: 36354653.
2. Maletin A, Knezevic MJ, Koprivica DD, et al. Dental Resin-Based Luting Materials - Review. Polymers (Basel). 2023;15(20):4156. PMID: 37896400.
3. Jokstad A. A split-mouth randomized clinical trial of single crowns retained with resin-modified glass-ionomer and zinc phosphate luting cements. Int J Prosthodont. 2004;17(4):411-416. PMID: 15382776
4. Tuntiprawon M. Effect of tooth surface roughness on marginal seating and retention of complete metal crowns. J Prosthet Dent. 1999;81(2):142-147. PMID: 9922426.
5. Heintze SD. Crown pull-off test (crown retention test) to evaluate the bonding effectiveness of luting agents. Dent Mater. 2009;26(3):193-206. PMID: 19931901.
6. Jefferies SR, Pameijer CH, Appleby DC, et al. A bioactive dental luting cement -- its retentive properties and 3-year clinical findings. Compend Contin Educ Dent. 2013;34 Spec No 1:2-9. PMID: 23577551