To Lute or to Bond?
Posted on 05/13/2014
In a recent article in JADA 145A (April 2014, pgs 383-385), Dr. Gordon Christenson discusses the common question – what is the best method to cement an all ceramic crown such as e.Max or Zirconia?
Dr. Christenson offers a number of recommendations outlined below. But among his key observations is that a clinician should consider the eventual removal of the restoration first. If removal is of a high concern, luting cements are almost always recommended.
Here are the general rules:
1. Bonding: If preparation lacks retention, like onlays, short crown preparations, or significantly tapered restorations, bonding cements are recommended. However, removing that restoration may be impossible, as the material and the natural tooth will look nearly identical. So care should be taken to confirm the fit is excellent and margins are sealed, before cementing.
2. Luting: If preparation has adequate retention (i.e. acceptable length and parallelism of axial walls), luting cements (such as resin-modified glass ionomer, or conventional glass ionomer) are recommended. The advantages include easier removal, less likelihood of tooth sensitivity.
Dr. Christenson does not mention specific cements, but the following list is, from our experience, the most widely used:
Bonding: Insure, Cosmodent; Nexus, Kerr; Choice, Bisco;
Luting: Vivaglass, Ivoclar Vivadent; Variolink, Ivoclar Vivadent;GC Fuji, GC America; Panavia F, J. Morita; C&B Metabond;
Dr. Christenson offers a number of recommendations outlined below. But among his key observations is that a clinician should consider the eventual removal of the restoration first. If removal is of a high concern, luting cements are almost always recommended.
Here are the general rules:
1. Bonding: If preparation lacks retention, like onlays, short crown preparations, or significantly tapered restorations, bonding cements are recommended. However, removing that restoration may be impossible, as the material and the natural tooth will look nearly identical. So care should be taken to confirm the fit is excellent and margins are sealed, before cementing.
2. Luting: If preparation has adequate retention (i.e. acceptable length and parallelism of axial walls), luting cements (such as resin-modified glass ionomer, or conventional glass ionomer) are recommended. The advantages include easier removal, less likelihood of tooth sensitivity.
Dr. Christenson does not mention specific cements, but the following list is, from our experience, the most widely used:
Bonding: Insure, Cosmodent; Nexus, Kerr; Choice, Bisco;
Luting: Vivaglass, Ivoclar Vivadent; Variolink, Ivoclar Vivadent;GC Fuji, GC America; Panavia F, J. Morita; C&B Metabond;
