Partovi Mandana, Al-Havvaz Abdol H, Soleimani Banafsheh
Department of Endodontics, School of Dentistry, University of Babol, Babol, Iran.
Aust Endod J. 2006 Dec;32(3):116-9. doi: 10.1111/j.1747-4477.2006.00034.x.
The aim of this study was to assess the degree of staining of tooth crowns by commonly used endodontic sealers using a computer analysis method. Crown discolouration by root canal sealers AH26, Endofill, Tubliseal, Zinc oxide eugenol (ZnOE), Apatite root canal sealer III as well as gutta-percha and Cavizol (a filling material containing ZnOE) were tested on extracted human premolar teeth. The roots of the teeth were resected 3 mm below the cemento-enamel junction. The pulp chambers were then cleaned and irrigated. The samples were divided into nine groups of five samples each and filled with test materials. Ten teeth were used as control groups: five positive (amalgam) and five negative (distilled water). The degree of tooth discolouration was analysed at 3, 6 and 9 months. The crown discolouration was assessed by computer analysis of digital images taken from the samples using the CIE Lab colour system. Statistical analysis was carried out using anova, repeated measure anova and Tukey's HSD tests. All sealers caused a degree of tooth discolouration, which increased with time. Endofill and ZnOE caused the greatest discolouration and Apatite root canal sealer III caused the least discolouration after 9 months. The most discolouration during the test periods occurred in the cervical third of the crown.
本研究的目的是使用计算机分析方法评估常用根管封闭剂对牙冠的染色程度。在拔除的人类前磨牙上测试根管封闭剂AH26、Endofill、Tubliseal、氧化锌丁香酚（ZnOE）、磷灰石根管封闭剂III以及牙胶和Cavizol（一种含ZnOE的填充材料）导致的牙冠变色情况。将牙根在牙骨质-釉质界下方3毫米处切除。然后清理并冲洗髓腔。将样本分为9组，每组5个样本，并填充测试材料。10颗牙齿用作对照组：5个阳性（汞合金）和5个阴性（蒸馏水）。在3、6和9个月时分析牙齿变色程度。使用CIE Lab颜色系统通过对样本拍摄的数字图像进行计算机分析来评估牙冠变色情况。使用方差分析、重复测量方差分析和Tukey's HSD检验进行统计分析。所有封闭剂都会导致一定程度的牙齿变色，且随着时间推移而增加。9个月后，Endofill和ZnOE导致的变色最严重，而磷灰石根管封闭剂III导致的变色最少。测试期间，牙冠颈部三分之一处的变色最为明显。
