Silanization increases the reliability of the dental restoration

In metal-free restorations, the adhesion of porcelain to the tooth tissues requires the use of special preparations based on silane.

Silan is used as an intermediate layer between the composite and the ceramic and allows to increase the reliability of the restoration and reduce the postoperative sensitivity of the teeth.

More about technology

Silanization is the coating of the restoration area with a thin layer of a silane solution to increase adhesion and moistening. This intermediate layer between porcelain and composite makes it possible to carry out various restoration procedures with minimal invasiveness.

Specifications

Silane is a dual function monomer in the form of a liquid solution. It makes possible the connection between organic and inorganic substances. The one-component solution is supplied in syringes with disposable nozzles and protective cap.

Properties and composition of the drug

The composition of the preparation is simple: Silan in alcohol solution (acetone may be added). Silicon radicals of silane bind with silicon in porcelain, glass fiber, and radicals of organic origin are embedded in the layer of polymer cements. Due to this, the drug increases the adhesion between the tooth tissue and the restoration material at the mechanical and chemical levels.

In addition, silane enhances the resistance of the restoration to moisture, protecting the bonding from the effects of liquids and premature wear. In fact, due to the presence of a solvent in its composition, the drug penetrates into the etched surface ceramic element, and after evaporation of the solvent, a layer of methacrylate remains, which adheres well to composite.

Indications for use

Silane is used in restorations in which polymer cements are bonded to ceramics, fiberglass pins, keromers and composite materials. It is also suitable for work in which a chipped fragment is attached to a ceramic element. The preparation is applied to the surface of the ceramic or post.

Surface treatment

Silane is used for surface treatment of various elements:

• inner surface of restorations (ceramics, keromers, laboratory composites);
• details of the listed restorations requiring partial or complete restoration using composites;
• fiberglass pins.

The drug is recommended for use in all these cases when working in the adhesive cementation technique. If there are metal elements in the working area, they are covered with a layer of opaque, then work is carried out in the usual manner established by the instructions for the composite.

Application methods

When cementing fiberglass posts, the surface of the post is cleaned with alcohol and thoroughly air-dried. The silane is then applied with a brush and cured for 60 seconds. The layer is dried with air without water and oil impurities, and then the cementing work is carried out according to the instructions for a specific polymer cement.

Cementation of ceramics and keromer restorations is carried out in several stages:

1. Sealing the margin of the restoration with wax.
2. Applying hydrofluoric acid 10% to the inner work area.
3. Washing off the acid and drying the surface.
4. Silane application for 60 seconds, air drying.
5. Adhesive application.
6. Restoration of the chipped area with composite material according to the instructions.

The protection of the edges of the working area with wax is very important, as hydrofluoric acid can destroy the outer edges of the restoration and lead to the adhesion of the polymer cement to it.

The use of silane in all cases is carried out according to a simple scheme:

• applying a layer to an acid-etched surface;
• one minute break allotted for the interaction of materials;
• drying by a stream of air without oil impurities and water.

Application technique

Silane is applied using the White Mini Brush in a thin, even layer over the entire work surface. The product can only be used on a well-dried surface that, after correctly etched treatment, has a matte coating. The area of ​​porcelain that has been acid-treated must be thoroughly rinsed.

The silanization step not only increases the adhesion to the ceramic surface, but also moisturizes it when dry. By using a silane solution, the specialist can more thoroughly prepare the porcelain surface for work.

Precautionary measures

When working with silane, it is necessary to adhere to precautions in relation to handling the patient and maintaining the properties of the drug. So, if the syringe is not in use at the moment, it must be closed with a protective cap to prevent the evaporation of alcohol. All attachments must be disposable.

Before applying the product, make sure that the working surface is properly acid etched, rinsed and dried. Only in this case will the silane provide the expected effect.

The tissues of the oral cavity, mucous membranes and human skin must be protected from contact with silane. If the drug comes into contact with the patient's mucous membrane, it must be thoroughly rinsed. Silan is kept refrigerated and used only under aseptic conditions.

The solution is highly flammable, so it must not be used near open sources of fire. When stored outside the refrigerator, no chemical changes occur in the preparation, however, the higher the ambient temperature, the faster the alcohol evaporates.

How important is the silanization step?

The use of silane can significantly improve the quality of work. An easy-to-use preparation requires a minimum investment of time and effort from the doctor, but helps to achieve the highest adhesion between composite materials and ceramic materials.

Compliance with simple rules of use helps to get the maximum effect with metal-free restorations.