SpeedCEM Plus – working principle

SpeedCEM Plus – working principle

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SpeedCEM Plus is a self-adhesive, self-curing resin cement with optional light-curing. This video explains how this self-adhesive and self-curing material works using the cementation of a zirconium oxide crown as an example. Preparation and restoration are conditioned according to the Instructions for Use. SpeedCEM Plus is now applied onto the bonding surface. The adhesive monomer MDP in the material starts exerting its effect on the zirconium oxide surface as soon as it is applied. The monomer consists of a phosphoric acid group and a methacrylate group. The phosphoric acid group acts as the bonding agent on the zirconium oxide surface. It reacts with the oxygen on the zirconium oxide surface and forms a very strong chemical bond. The opposing methacrylate group enables the connection with the other components in the cement. In the meantime, the crown is placed in the patient’s mouth. As soon as the cement comes into contact with the tooth structure, the strong adhesive forces of the MDP become effective. In addition to organic substances, the tooth structure mainly consists of hydroxy apatite. The phosphoric acid group of the MDP reacts with the calcium of the hydroxy apatite. A strong chemical bond between MDP and the tooth structure is formed. The cement is polymerized using the self-curing or dual-curing mode. With the activation of the initiators, the monomers are combined to form a stable network upon polymerization. In this process, the MDP adhesive monomers on the restoration and the tooth surface as well as the filler particles are integrated into the network. The filler particles provide high stability and particularly high radiopacity of the cement. The polymerization of the cement can be accelerated with a curing light.

2 comments

  1. hi. When we try the restoration in the mouth, it comes into contact with the salivary phosphates which contaminate the zirconia intaglio surface blocking the bonding sites. How can a reliable bond be achieved in such a clinical situation.

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