Restoration system 3M

The emergence of new dental materials, extensive aesthetic dentistry and the growing demands of patients for aesthetic dental updates encourage dentists to correct the work of the past. Currently, the most common solution to this problem is to replace traditional crowns from non-ferrous metals with aesthetic zirconium and cermet crowns.

However, given the need for laboratory production of these aesthetic designs, their high cost, multistage treatment, resection of the enamel in the preparation process, doctors increasingly prefer the method of direct composite restoration of teeth.
Undoubtedly, unlike usual filling, for restoration of all crown part of a tooth a gamut of composite materials of various shades and transparency is necessary.

Composite materials are divided into 5 groups according to the degree of opacity (opacity).

The first group - masking agents - liquid composites with maximum opacity, which is absent in natural teeth. These are dyes that can obscure the fluorosis spot, hide the color of the metal structure, eliminate the discolouration of the tooth tissues that arose as a result of endodontic treatment with the use of tooth syringes.

The second group - composite materials in terms of opacity are similar to dentin tooth, so-called opaquers. They are indispensable in the restoration of significant tooth defects, where imitation of natural dentin is needed.

The third group is composites, which occupy an intermediate place in the degree of opacity between enamel and dentine and imitate them. An example of such a material is the Valux Plus composite, which is part of the 3M restoration system.
The fourth group is enamel composites, or composites with standard transparency, the application of which allows to achieve the effect of natural depth and translucency of the enamel of the tooth.

The fifth group is composites with increased transparency, which are used mainly to restore the cutting edge of the front teeth.

They have a characteristic grayish or grayish-blue hue.

For many years, the dental clinic Dent has accumulated extensive experience in restoration and restoration of teeth after removing unaesthetic metal and plastic crowns. We bring to the attention of specialists one of the options for restoring the crown part of natural teeth with the materials of the company 3M, the restoration system of which contains composite materials of all the named groups.

Fig. 1. The initial situation before the restoration of the natural appearance of the dentition: 21 and 22 teeth are covered with metal crowns, made 16 years ago. There are no changes in the periapical tissues (based on radiography data)

Fig.2. Type after removal of the crowns: a change in the color of the tissues of the 21 teeth, caused by endodontic treatment with the use of dyes. Simultaneously with the restoration of the anatomical form 21 and 22 teeth, it is necessary to eliminate the color defect of the 21 teeth.

Fig. 3. Fig. The key to successful restoration is the reliable isolation of the cofferdam.

Fig.4. The filling material that filled the pulp chamber is eliminated. The sealed root canals are insulated with a neutral gasket to avoid contact with the components of the adhesive system. After etching, the Single Bond adhesive system is applied.

Fig.5. For the imitation of natural dentin using the sandwich technique, an opaque (universal dentin from the Valux Plus restoration kit)

Fig.6. After preliminary preparation (installation of a transparent matrix and a slight wedging of the teeth), the oral surface of the crown, proximal walls and cutting edge are layer-by-layer restored using the basic shades of Valux Plus.

Fig.7. Before conducting the lining of the vestibular surface, abrasive surface treatment with diamond burs is carried out. The incisal edge is vestibular thinned, in order to restore its front wall in the subsequent stages with a transparent shade of I (Insight) Siluxe Plus.

Fig.8. The application of the adhesive system Single Bond is preceded by acid etching of the tooth tissues for 20 seconds.

Fig.9. The part of the tooth that is darkened and changed in color is covered with the thinnest layer of masking agent 3M.

Fig.10. In order to "smooth out" the non-uniform structure of the tooth structure on the vestibular surface, a small amount of opaque is applied after the masking agent (universal dentine Valux Plus).

Fig.11, 12. At subsequent stages, less transparent layers of Valux Plus are layered first, then (superficially) - transparent shades of Silux Plus.

Fig. 13. The processing of the restored crowns of 21 and 22 teeth is carried out with the help of finishing burs. After eliminating excess material and giving the anatomical form to the teeth, a microrelief of the vestibular surface is formed to give a natural appearance.

Fig.14. The polished teeth polished to a mirror finish have a natural appearance. The slightly lighter neighboring teeth, which have dried during the procedure, after the natural water absorption will gain the same appearance, and the gingival interval between 21 and 22 teeth will be closed by the regenerated gingival papilla.

• Author: O.Mykolaichuk
• Denta Plus