Process and colour kit for the colour correction of dental prosthesis or natural teeth

The invention relates to a method and a color kit for color correction of all kinds of dentures (Eg veneers, crowns, bridges, denture teeth, fillings, inlays, etc.) from the may be varied in the dental field common materials produced (Eg composites, ceramics, plastics) and of natural teeth.

There are a number of color systems and color keys that the adaptation the dental technician the finished prosthesis from him to the course prescribed tooth color of the patient facilitate. For this, the most well-known system of 16 colors comprehensive one called Vita® -Farbschlüssel (Vita® Lumin-Shade Guide). In this system, the color groups A (red-brown: shades: A1, A2, A3, A3.5, A4) B (red-yellow: color B1, B2, B3, B4), C (gray: Colors C1, C2, C3, C4) and D (reddish gray: colors D2, D3, D4) represented in varying degrees of intensity.

After visual determination of brightness and color intensity of the color is likewise determined by sight selected and instructed the dental laboratory with the production of the dental prosthesis. The hue is located at Vita in 4 groups A, B, C and D, which in turn in different intensities are divided.

It can always happen that after completion of the dentures the color but not quite fit and correction is needed.

To correct such errors methods and systems for ceramic bodies already known: DE 195 04 31 A1 recommends etching of the ceramic and coating a thin liquid curable Tooth color. DE 31 25 924 A1 relates to the color correction of ceramic without pretreatment the surface by means of preferably nail varnish and then glazing. In the 43 40 352 A1 describes the application of a veneering. DE 101 26 968 A1 relates a color kit for the preparation and coloration of the gum portion of denture.

According to the invention is a method for color correction of dental restorations or herein proposed natural teeth, the color correction based on common basic colors allows. For this purpose in a preferred embodiment, correction for color Vita -Grundfarben A, B, C and D provided. These can then by diluting the intensity are used to generate intermediate tones. Preference is additionally three correction coatings for the color directions orange, white and blue and black in addition to Influencing the brightness. The correction coatings allow, starting from the respective Basic color corrections towards orange, white or blue. Thus, the color shades human dentures covered completely. The coatings can through transparent dilution infinitely adjustable in intensity. This is advantageous with a transparent varnish reached. Exemplary embodiments can be found in those described below Color kits.

It is of course possible to the method of example to other color systems as the used Vita system apply. For this purpose, where appropriate, the color correction tones or the number of correcting colors changed.

The method is suitable for all kinds of dental work such as crowns or artificial teeth, but also for natural teeth or tooth surfaces. can hochweiß A painting toward replace as a teeth bleaching. Before application of the correction color, the surface is the suitably prepared to correct tooth in the customary manner, for example by etching, Sanding and / or application of adhesion promoters.

Suitable coatings should meet the following requirements:

It should be a light-curable coating material which is flowable, a paste-like or paint-like consistency has coatable with the brush, after curing a smooth and glossy surface is formed, and finally an abrasion-resistant coating on a tooth surface or a dental prosthesis surface results that a desired color impression evokes in the viewer.

Preferably, such materials<sl><li>(A) 40 -. 60% by weight of matrix monomer (s)</li><li>(B) 60-40% by weight filler of quartz. </li><li>(C) 0.1 - 1% by weight (Photo) initiator.</li><li>(D) small amounts of dental pigments.</li></sl>

The matrix monomers are preferably conventional dental monomers, eg a mixture of Bisphenol-A-diglycidilacrylate, urethane dimethacrylate and triethylene glycol dimethacrylate.

The filler mixture of quartz may preferably be a mixture of quartz and silica-containing its splinter polymer. The splinter polymer can be eg quartz / Polydodecandioldimethacrylat.

The quartz filler can glass fillers (eg Ba-Al silicate glasses, also containing fluoride) and / or metal and non metal oxides and their mixed oxides.

The photoinitiator is preferably camphorquinone or bis or trisacylphosphine.

The pigments are pigments preferably used in the dental industry, such as iron oxides, Chromium-iron-zinc spinels, titanium dioxide, copper-chromium-iron spinels, cobalt aluminum spinels and zirconium.

Further embodiments of the invention are known. Color kits, which are collections of Individual components with which the inventive method can be performed. Preferably, there are also the appropriate color key, instructions and tools included. Insbsondere it is possible to correct colors for Vita shades A, B, C, D separated and correction colors toward the blue, yellow or white offer separately, each preferably with Transparent lacquer and black lacquer.

The invention also relates to a color kit for color correction of tooth replacements or tooth surfaces, comprising the following components:<sl><li>1 corrective color for the Vita basic tooth colors A,</li><li>1 corrective color for the Vita basic tooth colors B,</li><li>1 corrective color for the Vita basic tooth colors C,</li><li>1 corrective color for the Vita basic tooth colors D,</li><li>1 transparent thinning paint for adjusting the color intensity and optionally</li><li>1 black corrective color for individualizing the Vita basic tooth colors with respect to brightness; Furthermore, a Color kit for color correction of tooth replacements or tooth surfaces, comprising the following components: </li><li>1 orange corrective color for individualizing the Vita basic tooth colors in the red / yellow Color range</li><li>1 blue corrective color for individualizing the Vita basic tooth colors in the blue / green Color range</li><li>1 white corrective color for individualizing the Vita basic tooth colors and brightness Transparency,</li><li>1 transparent thinning paint for adjusting the color intensity and optionally</li><li>1 black corrective color for individualizing the Vita basic tooth colors with respect to brightness; and additionally a summarized color kit for color correction of tooth replacements or tooth surfaces, comprising the following components:</li><li>1 corrective color for the Vita basic tooth colors A,</li><li>1 corrective color for the Vita basic tooth colors B,</li><li>1 corrective color for the Vita basic tooth colors C,</li><li>1 corrective color for the Vita basic tooth colors D,</li><li>1 orange corrective color for individualizing the Vita basic tooth colors in the red / yellow Color range</li><li>1 blue corrective color for individualizing the Vita basic tooth colors in the blue / green Color range</li><li>1 white corrective color for individualizing the Vita basic tooth colors and brightness Transparency,</li><li>1 transparent thinning paint for adjusting the color intensity and optionally</li><li>1 black corrective color for individualizing the Vita basic tooth colors with respect to brightness.</li></sl>

These can each shade Mixing Instructions and explanation of the correction possibilities and appropriate tools like mixing plate, pipette, brush come.

The inventive method for color correction can in practice by way of example in the following As described are used to color adaptation of composite veneer crowns:<ul><li>The surface of the polymerized faced crown is a sandblaster by Al₂O₃Sand and a pressure of 2 bar roughened.</li><li>The surface is cleaned with a steam cleaner and dried following. </li><li>An activation fluid as c &amp; b liquid (Fa. Heraeus Kulzer) is applied with a brush (Composition: Dimethacrylate, multifunctional methacrylates, adhesive silane, Photoinitiators).</li><li>According to the color correction be made to the required color from the Kit of color coating materials selected, optionally mixed and accordingly of the desired color effect applied with a brush.</li><li>The color coating of the invention is a polymerization unit (eg Heraflash, Fa. Heraeus Kulzer) polymerized.</li><li>The surface of the color-corrected faced crown is to achieve a high gloss polished if necessary with suitable polishing systems (eg Prepol and Hipol, Fa. Heraeus Kulzer).</li></ul>

This basic method is depending on the application (for example, material of the surface, intra- or extra-oral use) with respect to the surface treatment of the color to be corrected Surface, the connection of the correction and varnishes used to for curing Devices adapted.

In the shade customization and correction of a natural tooth, the connection is made for example by conventional methods such as etching and bonding.

When correcting PMMA denture teeth own other activating solutions (eg c &amp; b connector, Fa. Heraeus Kulzer, a light-curing conditioner to connect light-curing c &amp; b-veneering of PMMA-hot or cold-cured polymers and plastic denture teeth. Composition: methyl methacrylate, polymethyl methacrylate, urethane, Photoinitiators.

When correcting ceramic surfaces, for example, conventional Silanisierungsmethoden offer.