Color Stability of Different Denture Teeth Materials against Various Staining Agents

Abstract

The purpose of this in vitro study was to evaluate the color stability of two brands of porcelain teeth and three brands of acrylic denture teeth. Samples were immersed into three staining drinks as test groups and distilled water as a control. Color measurements of teeth were performed by using a spectrophotometer. Before immersion, the initial color value of each tooth was recorded. Color change values were determined after 1 day, 1 week, 2 weeks, and 4 weeks of immersion. Color differences were characterized using the CIE L*a*b* color space. The color stability of all teeth was significantly affected by the immersion period (p<0.0001). Instant coffee was found to be the most chromogenic agent among the solutions tested (p<0.0001). Among the materials tested, porcelain was found to be more resistant to discoloration. It was concluded that acrylic teeth showed a higher degree of color change and that the amount of color change for each group increased proportionally with time.

Effect of Cigarette Smoke on Acrylic Resin Teeth

“…Among denture teeth, resin teeth are known to have sidelined ceramic teeth in the market recently [9]. On the downside, conventional acrylic teeth are inferior to porcelain teeth in maintaining an adequate aesthetic appearance with wear and discolouration, and they thus have a shorter durability period and service life [9].…”

“…It is currently one of the most popular and widely used colour spaces. It is well suited for the determination of small colour differences [9]. American Dental Association (ADA) recommends the use of this system.…”

“…In dental literature, the staining of various aesthetic dental materials like composite resin [1,3-5,7] and maxillofacial silicone [8] by cigarette smoke has been reported,. Also, there is a good amount of literature which have reported staining which was caused by food colourants, like staining of artificial teeth [9,10], aesthetic restorative materials [11,12], denture base resin [13] and acrylic resins for provisional restoration [14]. Some authors had evaluated colour stabilities of denture teeth as was affected by both polymerization methods and thermal cycling [15].…”

“…This colour system has a meaningful correlation with the visual perception and clinical significance of colour differences [9,15,21]. Thus, CIELAB measurements evaluate the colour of each specimen at a given time and they also enable the calculation of the amount of colour change (∆E) between two time intervals by using a formula:…”

“…According to Coresta Recommended Method N° 22 6 , standard conditions which were used were as follows:- To detect colour change, instrumental techniques are preferred, as they eliminate the subjective interpretation [9,15,18,19]. Among them, spectrophotometers are preferred, as they can generally provide more systematic, reliable and precise measurements [15].…”