Luting Cement

Source: 3M Dental Products Division

Luting Cement
RelyX luting cement consists of a powder and a liquid, like the other products in the company's glass-ionomer line
RelyX luting cement consists of a powder and a liquid, like the other products in the company's glass-ionomer line. The powder is mixed with the liquid in a 1:1 scoop:drop ratio within 30 seconds. The resulting mix is mousse-like and is easily scooped off the pad for placement in the crown or bridge restoration. Working time is 2.5 minutes. After placement of the crown/bridge, excess cement may be removed from the margins after a minimum of 3 minutes.

This product passes all ISO 9917:1991 (E) requirements for glass-ionomer luting cements. These requirements include a maximum film thickness of 25 microns, setting time between 2.5 and 8 minutes, minimum compressive strength of 70 MPa, and acid erosion of less than 0.05 mm/hour.

The system is based on the chemistry of the company's Vitremer Core Buildup/Restorative product. However, this luting cement is not light curable. Two setting reactions do take place in this system: an acid-base reaction between the fluoroaluminosilicate glass and the polycarboxylic acid (i.e., a true glass ionomer setting reaction), and a free radical polymerization of the pendant methacrylate groups of the polymer and HEMA (2-hydroxyethylmethacrylate). The free radical polymerization reaction takes place without the need for light activation (a methacrylate dark cure) via the same patented water-activated redox catalyst system found in the Vitremer Core Buildup/Restorative. FTIR (Fourier Transform Infrared) spectroscopy confirms the presence of both a glass ionomer and a methacrylate cure during setting. Because of this chemistry, the luting cement can be classified as a hybrid glass-ionomer cement.


  • Permanent cementation of porcelain fused-to-metal crowns and bridges to tooth structure, amalgam, composite or glass ionomer core buildups
  • Luting metal inlays, onlays or crowns
  • Pre-fabricated and cast post cementation
  • Luting orthodontic bands
  • This luting cement is not indicated for composite or porcelain inlays or onlays, composite or all porcelain crowns.

    3M Dental Products Division, Bldg. 275-2SE-03, 3M Center, St. Paul, MN 55144. Tel: 800-634-2249; Fax: 800-782-0956.