Color stability - an important issue during orthodontic treatment.

Ziskind, D., Dr. Med. Dent.

www.lingualnews.com Volume 1, Number 1, November 2002

Proper shade selections for reconstructive restoration become easier with recently developed optimized-particle composites. However, achieving a pleasing appearance in our patients in the long term is not always guaranteed. Changes in color and optical properties after polymerization, accelerated aging or staining as a result of using mouth-rinsing solution during orthodontic treatment, are the subject of research in the field of dental materials. (Fig 1)

Fig 1: Staining as a result of using mouth-rinsing solution during orthodontic treatment

Water storage and light exposure influence the color properties of microfilled and hybrid composites. Resin-based restoration materials undergo measurable changes due to daylight exposure. (Fig 2). Increased changes occurred under the influence of water storage. (Buchalla W et.al. 2002, Nathanson D, Banasr F. 2002) The chemical action of mouth rinsing solution, bleaching agents or other materials may affect Surface texture and color perception.Color is a complex property of a material that is interpreted through light waves by the brain. A change in the reflectance property may cause different color perception. (Fig 3).

Fig 2: Resin-based restoration materials undergo measurable changes

Fig 3: The chemical action of mouth rinsing solution, bleaching agents or other materials may affect Surface texture. A change in the reflectance property may cause different color perception.

No effect was found from tooth bleaches from commercial bleaching systems and 5.3% and 6.5% peroxide gel on the surface or subsurface prism architecture of enamel. (White DJ et. al. 2002). Other study compared bleached to unbleached bovine enamel indicates that the bleached bovine teeth showed apparent color differences as well as slight morphological alterations after bleaching. (Kwon YH et. al. 2002).

An interesting method to reduce chlorhexidin staining was found to be effective. A whitening dentifrice has demonstrated stain suppression when prescribing a chlorhexidine rinse. (Tilliss TS 1999).

References:
1. Buchalla W, Attin T, Hilgers RD, Hellwig E.
The effect of water storage and light exposure on the color and translucency of a hybrid and a microfilled composite. J Prosthet Dent 2002 Mar;87(3):264-70

2. Nathanson D, Banasr F.
Pract Proced Aesthet Dent 2002 Aug;14(6):449-55;

3. White DJ, Kozak KM, Zoladz JR, Duschner H, Gotz H.
Peroxide interactions with hard tissues: effects on surface hardness and surface/subsurface ultrastructural properties.
Compend Contin Educ Dent 2002 Jan;23(1A):42-8

4. Kwon YH, Huo MS, Kim KH, Kim SK, Kim YJ
Effects of hydrogen peroxide on the light reflectance and morphology of bovine enamel. J Oral Rehabil 2002 May;29(5):473-7

5. Tilliss TS. Use of a whitening dentifrice for control of chlorhexidine stain.J Contemp Dent Pract 1999 Nov 15;1(1):9-15

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Adult and Lingual Orthodontics
EDITORS:
Dr. Silvia Geron D.M.D., M.Sc
Dr. Rafi Romano D.M.D., M.Sc
Dr. Pablo Echarri D.M.D., M.Sc