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KMID : 0358920170440010028
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Journal of the Korean Academy of Pedodontics
2017 Volume.44 No. 1 p.28 ~ p.37
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Spectrophotometric Analysis of Crown Discoloration Induced by Various MTA Based Materials
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Lim Yu-Ran
Choi Nam-Ki
Kim Jae-Hwan
Kim Seon-Mi
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Abstract
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Mineral trioxide aggregate have been used for many years as a pulp therapy material. The most widely used product, Proroot white MTA® has a major drawback that it causes tooth discoloration. This study assessed discoloration of crown when various MTA-based materials were placed in the coronal aspect of the root canal. Seventy-five single-rooted, unrestored premolar teeth were selected. The teeth were randomly assigned to four experimental groups, each of Biodentine®, Proroot wMTA®, Endocem®, RetroMTA® and one negative control groups. Color measurements were utilized by the Commission International de I’Eclairage’s L*a*b* system with spectrophotometer. The color was assessed eight times : initial, 1 day, 1 week, 2 weeks, 4 weeks, 8 weeks, 12 weeks, and 16 weeks after the placement. Statistical analysis was performed using the 2-way repeated analysis of variance and Bonferroni’s method with p < 0.05. Proroot wMTA® induced significant decreases in L* values during experiment period. Tooth samples from the Endocem® group presented indistinct grayish color changes. The Biodentine® and RetroMTA® showed color stability. Consequently, while Proroot wMTA® and Endocem® that contain bismuth oxide as a radiopacifier showed tooth discoloration, displayed no sign of discoloration Biodentine® and RetroMTA® that contain zirconium oxide as a radiopacifier.
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KEYWORD
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Crown discoloration , Spectrophotometer , Mineral trioxide aggregate , Bismuth oxide , Zirconium oxide , Radiopacifier
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