冠向牙体变色与白色矿化三氧化物聚合体。
Coronal tooth discoloration and white mineral trioxide aggregate.
机构信息
Melbourne Dental School, University of Melbourne, Melbourne, Victoria, Australia.
出版信息
J Endod. 2013 Apr;39(4):484-7. doi: 10.1016/j.joen.2012.11.053. Epub 2013 Jan 30.
INTRODUCTION
This study assessed and characterized discoloration when white MTA (wMTA) was placed in the coronal aspect of the root canal ex vivo and the influence of red blood cells on this discoloration.
METHODS
Canals were prepared from the apical aspect and restored with either wMTA + saline (n = 18), wMTA + blood (n = 18), or controls (n = 4 + 4) (blood or saline alone). Color was assessed according to the CIE Lab* color space using standardized digital photographs at 3 time points: baseline, day 1, and day 35. Statistical analysis was performed by using 1-way analysis of variance and a 2-sample t test with P < .05.
RESULTS
All teeth discolored when restored with wMTA, which was most prominent in the cervical third of the crown. The presence of blood within the canal adjacent to the setting wMTA exacerbated the discoloration (P = .03).
CONCLUSIONS
wMTA induces the gray discoloration of the tooth crown, and the effect is compounded in the presence of blood.
简介
本研究评估并描述了在根管冠向部位使用白色 MTA（wMTA）后发生的变色情况，以及红细胞对这种变色的影响。
方法
从根尖部位制备根管，并分别用 wMTA + 生理盐水（n = 18）、wMTA + 血液（n = 18）或对照组（n = 4 + 4）（单独血液或生理盐水）进行修复。在 3 个时间点（基线、第 1 天和第 35 天），使用标准化数码照片按照 CIE Lab*颜色空间评估颜色。采用单因素方差分析和 2 样本 t 检验进行统计学分析，P <.05。
结果
所有用 wMTA 修复的牙齿都发生了变色，在冠部的颈三分之一最为明显。与凝固的 wMTA 相邻的根管内有血液存在会加重变色（P =.03）。
结论
wMTA 会导致牙齿冠部的灰色变色，而血液的存在会使这种变色更加明显。
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