自粘接树脂水门汀在模拟根管内的硬度变化

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[摘要] 目的 比较自粘接与通用型树脂水门汀在模拟根管内固化开始后的硬度变化。方法 将双重固化自粘接树脂水门汀A（RelyX Unicem）、B（BisCem）和双重固化通用型树脂水门汀C（DUOLINK）注满单端开口、以盖板封闭的半圆柱形不锈钢槽，将光固化灯紧贴开口端持续照射20 s，试件避光保存0.5 h后打开封闭盖板，测量树脂纵断面距照射光源1～10 mm间，以1 mm为间隔共10个深度的努氏显微硬度。试件继续避光保存24、120 h后，重复上述测量。对测量数据进行统计学分析。结果 3种材料的硬度值随模拟根管深度的增加而降低（P

最多，24 h后硬度值达到或接近最大值。光照后120 h，除1 mm深处外，C组在各深度的硬度值均显著高于A和B组（P

0.001）。结论 2种类型树脂水门汀双重固化条件下的硬度值差异有统计学意义，但随时间变化的趋势基本一致。

[关键词] 自粘接树脂水门汀； 双重固化； 显微硬度； 根管

[中图分类号] R 783.1 [文献标志码] A [doi] 10.3969/j.issn.1000-1182.2012.03.005

Hardness development of self-adhesive resin cement in simulated root canal Ding Hong1, Lan Weidong2, Meng Xiangfeng1. （1. Dept. of Prosthodontics, School of Stomatology, Nanjing University & Nanjing Stomatological Hospital, Nanjing 210008, China; 2. Dept. of Oral Medicine, School of Stomatology, Nanjing University & Nanjing Stomatolo-gical Hospital, Nanjing 210008, China）

[Abstract] Objective To compare the hardness development of dual-cured self-adhesive and universal resin cement in simulated root canal. Methods The light-proof half-cylinder steel slot with one end open were syringed and filled respectively by self-adhesive A（RelyX Unicem）, B（BisCem） and universal C（DUOLINK） resin cements, then the open end of slot was irradiated directly by a light unit for 20 s. Specimens were stored in a light-proof box for 0.5 h, Knoop microhardness was measured along the vertical surfaces of specimens from 1 mm to 10 mm depth at 1 mm intervals. The same measurements were taken at 24 h and 120 h after irradiation. Data were analyzed by One-way ANOVA. Results

Hardness of each group decreased with the increase of simulated canal depth（P

[Key words] self-adhesive resin cement； dual-cured； microhardness； root canal

临床常用树脂水门汀将成品金属桩或纤维桩黏固在残根残冠的根管中，从而为冠桥修复体提供支持。有限元分析显示：桩冠修复体在功能载荷下的最大剪切应力集中在牙根管壁-树脂水门汀-根管桩界面[1]。因此对桩冠的稳定支持一方面来自树脂水门