Colour determination using a spectrophotometer
®, tooth
Changes in tooth colour of the treatment and control groups were measured using the VITA EasyShare Advance® (Vita Zahnfakrik, Germany) device. Before measurement, the teeth were isolated and air-dried for 5 s. The measurements were repeated three times for each tooth, and the averages of the L*, a*, and b* values of the International Commission on Illumination (CIE) scale were recorded. The changes in tooth colour were measured before; immediately after; and 1, 3, and 6 months after resin application in both the treatment and control groups. The teeth' L*, a*, and b* values and the subsequently derived ΔE values were recorded.