高粘度大块充填复合树脂的固化行为

Curing behaviour of high-viscosity bulk-fill composites.

作者信息

Ilie Nicoleta, Stark Katharina

机构信息

Department of Operative/Restorative Dentistry, Periodontology and Pedodontics, Ludwig-Maximilians-University of Munich, Goethestr. 70, 80336 Munich, Germany.

出版信息

J Dent. 2014 Aug;42(8):977-85. doi: 10.1016/j.jdent.2014.05.012. Epub 2014 Jun 2.

DOI:10.1016/j.jdent.2014.05.012

PMID:24887360

Abstract

OBJECTIVES

This study aimed to assess the effect of curing conditions--exposure time, mode, energy density, and exposure distance--on the mechanical properties of high-viscosity bulk-fill resin-based composites (RBCs) measured at simulated clinical relevant filling depths.

METHODS

Three high-viscosity bulk-fill RBCs were investigated by assessing the variation in micromechanical properties in 200μm steps (Vickers hardness [HV] and indentation modulus [E]) within simulated 6-mm deep fillings (n=5) polymerized under 16 different curing conditions. The exposure duration was 5, 20, and 40s in the standard power mode; 3, 4, and 8s in the high power mode; and 3 and 6s in the plasma mode; the exposure distance was 0 and 7mm. Energy density ranged from 2.63 to 47.03J/cm(2). Measurements were performed after 24h of storage in distilled water at 37°C. The depth of cure (DOC) was calculated as the 80% hardness drop-off.

RESULTS

The results were compared using one- and multiple-way ANOVAs and Tukey's HSD post hoc test (α=0.05). The effect of the parameter material was significant and strong on all measured properties (p<0.05, partial eta-squared ηP(2)=0.492 for E, 0.562 for HV, and 0.087 for DOC). Energy density exerted the strongest influence on the measured properties in all materials, whereas the influence of the exposure distance was strong on DOC, low on E and not significant on HV. The high-viscosity bulk-fill RBCs respond heterogeneously to variations in curing conditions.

CONCLUSIONS

A lower energy density limit was identified, allowing for a 4mm material bulk placement (5.88J/cm(2) for EvoCeram Bulk Fill, 7.0J/cm(2) for x-tra fil, and 23.51J/cm(2) for SonicFill). This limit increased to 47.03J/cm(2) for a 5mm bulk placement, as claimed for SonicFill. To maintain mechanical properties in depth, however, an energy density of at least 23.51J/cm(2) is recommended for EvoCeram Bulk Fill and x-tra fil and 47.03J/cm(2) for SonicFill, respectively. This energy density should be achieved at moderate irradiance and increased curing time.

CLINICAL SIGNIFICANCE

An exposure time of 20s at moderate irradiance is recommended for all materials for a 4 mm bulk placement.

摘要

目的

本研究旨在评估固化条件（暴露时间、模式、能量密度和暴露距离）对在模拟临床相关充填深度下测量的高粘度大块充填树脂基复合材料（RBCs）力学性能的影响。

方法

研究了三种高粘度大块充填RBCs，通过评估在16种不同固化条件下聚合的模拟6mm深充填物（n = 5）中，以200μm步长（维氏硬度[HV]和压痕模量[E]）的微观力学性能变化。在标准功率模式下暴露持续时间为5、20和40秒；在高功率模式下为3、4和8秒；在等离子体模式下为3和6秒；暴露距离为0和7mm。能量密度范围为2.63至47.03J/cm²。在37°C蒸馏水中储存24小时后进行测量。固化深度（DOC）计算为硬度下降80%处的深度。

结果

使用单因素和多因素方差分析以及Tukey's HSD事后检验（α = 0.05）对结果进行比较。参数材料对所有测量性能的影响显著且强烈（p < 0.05，对于E，偏η² = 0.492；对于HV，偏η² = 0.562；对于DOC，偏η² = 0.087）。能量密度对所有材料的测量性能影响最强，而暴露距离对DOC影响强烈，对E影响较小，对HV无显著影响。高粘度大块充填RBCs对固化条件的变化反应不均一。

结论

确定了一个较低的能量密度限值，允许进行4mm材料的大块放置（EvoCeram Bulk Fill为5.88J/cm²，x-tra fil为7.0J/cm²，SonicFill为23.51J/cm²）。对于5mm的大块放置，该限值增加到47.03J/cm²，如SonicFill所宣称的那样。然而，为了在深度上保持力学性能，建议EvoCeram Bulk Fill和x-tra fil的能量密度分别至少为23.51J/cm²，SonicFill为47.03J/cm²。该能量密度应在适度辐照度和增加的固化时间下实现。