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有时间间隔的光固化周期变化及其对纳米混合复合材料聚合收缩、转化率和显微硬度的影响比较

Comparison of variation in the light curing cycle with a time gap and its effect on polymerization shrinkage, degree of conversion and microhardness of a nanohybrid composite.

作者信息

Subbiya Arunajatesan, Pearlin Mary Newbegin Selvakumar Gold, Suresh Malathi, Vivekanandhan Paramasivam, Dhakshinamoorthy Malarvizhi, Sukumaran Vridhachalam Ganapathy

机构信息

Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath University, Narayanapuram, Pallikaranai, Chennai, Tamil Nadu, India.

出版信息

J Conserv Dent. 2015 Mar-Apr;18(2):154-8. doi: 10.4103/0972-0707.153055.

DOI:10.4103/0972-0707.153055
PMID:25829697
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4379658/
Abstract

BACKGROUND

Giving a time gap and distance during curing can decrease the polymerization shrinkage.

AIM

To evaluate the effect of time gap and distance between the curing tip and restoration on the polymerization shrinkage, degree of monomer conversion (DOC), and microhardness of a nanohybrid composite.

MATERIALS AND METHODS

A total of 50 standardized cylindrical specimens (Z350, 3M ESPE) were fabricated using a brass mould. The curing was done in contact with the sample surface for 20 seconds in the control group. In the four experimental groups, curing was initiated at 1-cm distance, followed by variation in the time gap and the curing cycle. The polymerization shrinkage, DOC, microhardness was calculated.

STATISTICAL ANALYSIS

One-way analysis of variance (ANOVA) and post hoc-Dunnett test were used to analyze the data.

RESULTS

Curing at 1-cm distance for 10 seconds with a gap of 10 seconds and finishing the curing cycle with 20 seconds at 0 cm proved to be an appropriate technique to reduce the polymerization shrinkage without significantly affecting the DOC and microhardness.

CONCLUSION

A simple innovative modification of varying the distance of curing and a time gap in the curing cycle can decrease the polymerization shrinkage without affecting the DOC and microhardness.

摘要

背景

在固化过程中设置时间间隔和距离可降低聚合收缩率。

目的

评估固化头与修复体之间的时间间隔和距离对纳米混合复合材料聚合收缩率、单体转化率（DOC）及显微硬度的影响。

材料与方法

使用黄铜模具制作50个标准化圆柱形试件（Z350，3M ESPE）。对照组在与样品表面接触的情况下固化20秒。在四个实验组中，从1厘米的距离开始固化，随后改变时间间隔和固化周期。计算聚合收缩率、DOC及显微硬度。

统计分析

采用单因素方差分析（ANOVA）和事后Dunnett检验分析数据。

结果

在1厘米的距离处固化10秒，间隔10秒，然后在0厘米处再固化20秒完成固化周期，这被证明是一种适当的技术，可减少聚合收缩率，且不会显著影响DOC和显微硬度。

结论

在固化周期中简单创新性地改变固化距离和时间间隔，可在不影响DOC和显微硬度的情况下降低聚合收缩率。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/c717613363c3/JCD-18-154-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/d16e7dcf71bb/JCD-18-154-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/9a750c60ffbf/JCD-18-154-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/85cf49e21279/JCD-18-154-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/c717613363c3/JCD-18-154-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/d16e7dcf71bb/JCD-18-154-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/9a750c60ffbf/JCD-18-154-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/85cf49e21279/JCD-18-154-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/56ba/4379658/c717613363c3/JCD-18-154-g008.jpg

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