光固化复合树脂中的收缩应力：材料和光活化模式的影响。

Shrinkage stress in light-cured composite resins: influence of material and photoactivation mode.

作者信息

Charton Christophe, Colon Pierre, Pla Fernand

机构信息

Laboratoire des Sciences du Génie Chimique, UPR 6811, INPL, ENSIC, 1, rue Grandville, BP 451 F-54.001 Nancy Cedex, France.

出版信息

Dent Mater. 2007 Aug;23(8):911-20. doi: 10.1016/j.dental.2006.06.034. Epub 2006 Oct 6.

DOI:10.1016/j.dental.2006.06.034

PMID:17027939

Abstract

OBJECTIVES

The aim of this study was to record the effect of composite type and photoactivation mode on the stresses resulting from polymerization of five established composite resins: packable (Solitaire, Solitaire 2), micro-hybrid (Aelitefil, Z100) and hybrid (Clearfil AP-X).

METHODS

A mechanical testing machine was used to record the polymerization contraction stress (MPa) of cylindrical composite specimens (d=5mm; h=2mm; C-factor=1.25) at 0.1s intervals over a period of 400s. The samples were photopolymerized using a halogen light curing device under two types of light exposure: group 1, Standard (800mW.cm(-2)x60s); group 2, Exponential (logarithmic increase from 150 to 800mW.cm(-2) over 15s+800mW.cm(-2)x45s). The stress rate (SR: slope(MPa>0-60s)) and the maximum shrinkage stress (MSS: MPa(400s)) of each material (five replications) were statistically analysed by one-way ANOVA/Scheffe's test and Pearson's correlation procedure (alpha=0.05). Finally, Student's t-test (two matched series) enabled the assessment of the effect of the irradiation method on the results.

RESULTS

For group 1, in decreasing order, the MSS was 1.51+/-0.07MPa (Solitaire) statistically equivalent to 1.45+/-0.06MPa (Aelitefil), 1.29+/-0.08MPa (Solitaire 2), and 1.04+/-0.03MPa (Z100) statistically equivalent to 0.92+/-0.05MPa (Clearfil AP-X). Z100 showed the highest SR (0.045+/-6x10(-3)) and Solitaire, the lowest (0.017+/-2x10(-3)). There was no correlation between SR and MSS (r<-0.33, p<0.05). For group 2, the MSS and SR values were distributed in a similar way to those from group 1. There was a negative correlation between SR and MSS (r<-0.43 and p<0.01). The exponential ramp successfully reduced the MSS (-3.9%) and SR (-11%) values.

SIGNIFICANCE

There is no relationship between composite resin type, stress rate and shrinkage stress levels. The slower stress rate development, resulting from ramped light intensity, helped slightly to reduce the maximum polymerization stress.

摘要

目的

本研究旨在记录复合树脂类型和光活化模式对五种已确定的复合树脂聚合产生的应力的影响：可压实型（Solitaire、Solitaire 2）、微混合型（Aelitefil、Z100）和混合型（Clearfil AP-X）。

方法

使用机械试验机在400秒内每隔0.1秒记录圆柱形复合树脂试样（直径 = 5毫米；高度 = 2毫米；C因子 = 1.25）的聚合收缩应力（兆帕）。使用卤素光固化装置在两种光照类型下对样品进行光聚合：第1组，标准光照（800毫瓦·厘米⁻²×60秒）；第2组，指数光照（在15秒内从第150毫瓦·厘米⁻²对数增加到800毫瓦·厘米⁻² + 800毫瓦·厘米⁻²×45秒）。通过单因素方差分析/谢费检验和皮尔逊相关程序（α = 0.05）对每种材料（五个重复样本）的应力率（SR：斜率（兆帕>0 - 60秒））和最大收缩应力（MSS：兆帕（400秒））进行统计分析。最后，使用学生t检验（两个匹配系列）评估照射方法对结果的影响。

结果

对于第1组，按降序排列，MSS为1.51±±0.07兆帕（Solitaire），在统计学上等同于1.45±±0.06兆帕（Aelitefil）、1.29±±0.08兆帕（Solitaire 2），以及1.04±±0.03兆帕（Z100），在统计学上等同于0.92±±0.05兆帕（Clearfil AP-X）。Z100的SR最高（0.045±±6×10⁻³），Solitaire最低（0.017±±2×10⁻³）。SR和MSS之间无相关性（r < -0.33，p < 0.05）。对于第2组，MSS和SR值的分布与第1组相似。SR和MSS之间存在负相关（r < -0.43且p < 0.01）。指数斜坡成功降低了MSS（-3.9%）和SR（-11%）值。