电离辐射对修复材料性能的影响。

Effect of ionizing radiation on properties of restorative materials.

机构信息

Postgraduate Program in Dentistry, Dental School, University of Passo Fundo, Brazil.

出版信息

Dent Mater. 2018 Feb;34(2):221-227. doi: 10.1016/j.dental.2017.10.006. Epub 2017 Nov 6.

DOI:10.1016/j.dental.2017.10.006

PMID:29102159

Abstract

OBJECTIVE

To evaluate the effect of ionizing radiation from high energy X-ray on properties of restorative materials.

METHODS

Study materials (3M-ESPE) were: Z250-microhybrid resin-based composite (Filtek Z-250); Z350-nanofilled resin-based composite (Filtek Z-350XT); VIT-resin-modified glass ionomer cement (Vitremer); and KME-conventional glass ionomer cement (Ketac Molar Easymix). Sixty bar-shaped and cylinder-shaped specimens were fabricated from each material. Specimens were light activated (980mW/cm, Radii, SDI) for 60s (3×20s for Z250 and Z350) and 120s (3×40s for VIT) and thirty specimens from each shape were irradiated (IR) with 1.8Gy/day for 39days (total IR=70.2Gy). IR and non-irradiated (NI) specimens were evaluated for flexural strength (σ, n=30) followed by fractography (SEM), diametral tensile strength (DTS, n=30), hardness (H, n=10), surface roughness (R, n=10) and chemical composition (n=3). The IR effect on each material property was statistically analyzed using Student's t test (α=0.05). Data from σ and DTS were also analyzed using Weibull statistics.

RESULTS

IR significantly increased the mean σ values of VIT and KME and the mean DTS value of VIT (p<0.05). IR increased R and H values for VIT and decreased H value for Z-250 (p<0.05). The remaining materials and properties were not significantly affected by IR (p>0.05). There was no significant change on materials composition after IR.

SIGNIFICANCE

The recommended radiotherapy protocol for head and neck cancer altered some material properties, mainly for glass ionomer cements. Such variations on material properties are not related to chemical composition changes.

摘要

目的

评估高能 X 射线电离辐射对修复材料性能的影响。

方法

研究材料（3M-ESPE）为：Z250-微混合树脂基复合材料（Filtek Z-250）；Z350-纳米复合树脂基复合材料（Filtek Z-350XT）；VIT-树脂改性玻璃离子水门汀（Vitremer）；和 KME-传统玻璃离子水门汀（Ketac Molar Easymix）。每种材料均制作 60 个条形和圆柱形试件。试件用光激活（980mW/cm，Radii，SDI）60s（Z250 和 Z350 为 3×20s）和 120s（VIT 为 3×40s），然后将 30 个试件中的每个形状用 1.8Gy/天照射 39 天（总 IR=70.2Gy）。对 IR 和非照射（NI）试件进行弯曲强度（σ，n=30），随后进行断口形貌（SEM）、直径拉伸强度（DTS，n=30）、硬度（H，n=10）、表面粗糙度（R，n=10）和化学成分（n=3）评估。使用学生 t 检验（α=0.05）对 IR 对每种材料性能的影响进行统计学分析。σ 和 DTS 的数据也使用威布尔统计进行分析。