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Polymerization shrinkage of resin-based composites for dental restorations: A digital volume correlation study.
Dental Materials ( IF 4.6 ) Pub Date : 2019-09-22 , DOI: 10.1016/j.dental.2019.08.116 Marta Gallo 1 , Hazem Abouelleil 2 , Jean Marc Chenal 1 , Jérôme Adrien 1 , Joël Lachambre 1 , Pierre Colon 3 , Eric Maire 1
Dental Materials ( IF 4.6 ) Pub Date : 2019-09-22 , DOI: 10.1016/j.dental.2019.08.116 Marta Gallo 1 , Hazem Abouelleil 2 , Jean Marc Chenal 1 , Jérôme Adrien 1 , Joël Lachambre 1 , Pierre Colon 3 , Eric Maire 1
Affiliation
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OBJECTIVE
Resin-based composites are widely used in dental restorations; however, their volumetric shrinkage during polymerization leads to several issues that reduce the restoration survival rates. For overcoming this problem, a deep study of shrinkage phenomena is necessary.
METHODS
In this study, micro-tomography (μ-CT) is combined with digital volume correlation (DVC) to investigate the effect of several factors on the polymerization strain of dental composites in model cavities: the presence/absence of an adhesive, the use of transparent/blackened cavities, and irradiation times between 1 and 40s.
RESULTS
The results indicate that the presence of an adhesive at the interface between the cavity and composite does not reduce the total strain but instead limits it to a preferential direction. In addition, regardless of the conditions, the main strain is generated along the axis parallel to the polymerization irradiation (the vertical axis). Finally, the total strain appears to occur in the first 5s of irradiation, with no further evolution observed for longer irradiation times.
SIGNIFICANCE
This work provides new insight into resin-based composite shrinkage and demonstrates the benefit of coupling DVC and μ-CT to better understand the degradation mechanisms of these materials.
中文翻译：
牙科修复用树脂基复合材料的聚合收缩：数字量相关性研究。
目的树脂基复合材料被广泛用于牙齿修复。然而，它们在聚合过程中的体积收缩导致降低恢复存活率的几个问题。为了克服这个问题，必须对收缩现象进行深入研究。方法在本研究中，将显微断层扫描（μ-CT）与数字体积相关性（DVC）结合使用，以研究几种因素对模型型腔中牙科复合材料聚合应变的影响：粘合剂的存在与否，使用方法透明/变黑的腔体的照射时间为1到40s。结果结果表明，在型腔与复合材料之间的界面处存在粘合剂不会降低总应变，而是将其限制在优先方向上。此外，无论条件如何，主应变沿着平行于聚合辐射的轴（垂直轴）产生。最后，总应变似乎发生在照射的前5 s，对于更长的照射时间没有观察到进一步的演变。意义这项工作为树脂基复合材料的收缩提供了新的见解，并展示了将DVC和μ-CT偶联以更好地了解这些材料的降解机理的益处。
更新日期：2019-09-22
中文翻译：
牙科修复用树脂基复合材料的聚合收缩：数字量相关性研究。
目的树脂基复合材料被广泛用于牙齿修复。然而，它们在聚合过程中的体积收缩导致降低恢复存活率的几个问题。为了克服这个问题，必须对收缩现象进行深入研究。方法在本研究中，将显微断层扫描（μ-CT）与数字体积相关性（DVC）结合使用，以研究几种因素对模型型腔中牙科复合材料聚合应变的影响：粘合剂的存在与否，使用方法透明/变黑的腔体的照射时间为1到40s。结果结果表明，在型腔与复合材料之间的界面处存在粘合剂不会降低总应变，而是将其限制在优先方向上。此外，无论条件如何，主应变沿着平行于聚合辐射的轴（垂直轴）产生。最后，总应变似乎发生在照射的前5 s，对于更长的照射时间没有观察到进一步的演变。意义这项工作为树脂基复合材料的收缩提供了新的见解，并展示了将DVC和μ-CT偶联以更好地了解这些材料的降解机理的益处。
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