ANSWERS

How does a cement-retained restoration work?

A cement-retained restoration uses dental cement to bond a crown or bridge to a custom or stock abutment that has been torqued onto the implant. The lab fabricates the abutment and crown separately, the clinician seats the abutment, then cements the crown over it.

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The cement-retained workflow, step by step

A cement-retained implant restoration separates the connection into two parts. The abutment screws into the implant body at a torque value specified by the implant manufacturer, typically 30 Ncm for most major systems per Straumann and Nobel Biocare technical guidelines. The crown is then luted to that abutment with dental cement (resin, glass ionomer, or zinc phosphate depending on the case). Because the screw access channel terminates inside the abutment rather than the crown, the occlusal or lingual surface stays uninterrupted. This is why cement-retained remains the preferred choice for anterior esthetic cases where a screw channel would compromise the labial or incisal surface.

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When should I choose screw-retained over cement-retained?

Choose screw-retained when retrievability matters, on full-arch hybrids, on posterior cases where the screw access channel is hidden in the central fossa, and on any case where you want to eliminate cement-related periimplantitis risk entirely. Choose cement-retained for anterior single units where a labial screw access would be visible, for cases with limited interocclusal space, and when the implant angulation forces an unfavorable access channel. The Dani Dental prosthetic team will flag the recommendation on the case planning call before milling.

What cement should I use on an implant crown?

Resin-modified glass ionomer (RelyX Luting Plus, Fuji Plus) is the most common choice for implant crowns because it cleans up predictably and bonds reliably to zirconia or titanium abutments. Zinc phosphate remains acceptable for definitive cementation when retrievability is not a priority. Avoid permanent resin cements on implant crowns unless retrievability is explicitly not required. Always seat the abutment, verify margins, and radiograph after cementation to confirm no subgingival cement remnants per Wilson's 2009 Journal of Periodontology findings.

Can a cement-retained crown be retrieved if it fails?

Retrieval depends on the cement used. Temporary or semi-permanent cements (TempBond, RelyX Temp NE) allow the crown to be removed by sectioning or with a crown remover. Permanent cements typically require sectioning the crown off the abutment, which destroys the crown. This is the core retrievability disadvantage versus screw-retained: a screw-retained crown comes off in 60 seconds with a hand driver. Dani Dental recommends semi-permanent cementation on most single-unit implant crowns to preserve future retrievability.

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This answer is one piece of a larger workflow. The pillar page covers materials, turnaround, and how we build the case to your specification.

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