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不同光照强度和固化时间下，通过不同乳牙厚度固化的复合树脂的显微硬度：体外研究

Microhardness of composite resin cured through different primary tooth thicknesses with different light intensities and curing times: In vitro study.

作者信息

Mazhari Fatemeh, Ajami Behjatolmolok, Moazzami Saied Mostafa, Baghaee Bahareh, Hafez Bahareh

机构信息

Dental Material Research Center, Department of Pediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

Oral and Maxillofacial Diseases Research Center, Department of Pediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

出版信息

Eur J Dent. 2016 Apr-Jun;10(2):203-209. doi: 10.4103/1305-7456.178316.

DOI:10.4103/1305-7456.178316
PMID:27095897
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4813436/
Abstract

OBJECTIVE

The aim of this study was to evaluate the effect of increased exposure time and light intensity on microhardness of cured composite through different thicknesses of tooth structure in primary teeth.

MATERIALS AND METHODS

One hundred and seventy cylindrical resin composite specimens were prepared. All specimens were divided into 17 experimental and control groups. "Light-emitting diode" light curing unit (LCU) applied directly or through 1, 2, and 3 mm thicknesses tooth slices for experimental groups. The irradiation protocols were 25 and 50 s at 650 mW/cm(2) and 15 and 30 s at 1100 mW/cm(2). The "quartz-tungsten-halogen" LCU (400 mW/cm(2)) for 40 s was used in control group. Microhardness was measured by the Vickers hardness test.

RESULTS

Indirectly cured specimens and those cured through a 1 mm thick tooth structure, an increase in intensity caused hardness drop. In the specimens cured through 2 and 3 mm thick tooth structures, increased intensity and/or exposure time did not show any appropriate changes on microhardness.

CONCLUSION

Irradiation through a 1.0 mm thick tooth slice resulted in reduced microhardness although it was still within the clinically acceptable level. The hardness values of the specimens cured through 2 or 3 mm thick tooth slices fell below the clinically acceptable level even after doubling the exposure time and/or light intensity.

摘要

目的

本研究旨在评估增加照射时间和光强度对乳牙不同厚度牙体组织中固化复合树脂微硬度的影响。

材料与方法

制备170个圆柱形树脂复合材料标本。所有标本分为17个实验组和对照组。实验组使用“发光二极管”光固化机（LCU）直接照射或透过1、2和3毫米厚的牙片照射。照射方案为在650毫瓦/平方厘米下照射25和50秒，在1100毫瓦/平方厘米下照射15和30秒。对照组使用“石英 - 钨 - 卤素”LCU（400毫瓦/平方厘米）照射40秒。通过维氏硬度测试测量微硬度。

结果

间接固化的标本以及透过1毫米厚牙体组织固化的标本，强度增加导致硬度下降。在透过2毫米和3毫米厚牙体组织固化的标本中，强度和/或照射时间增加对微硬度未显示出任何明显变化。

结论

透过1.0毫米厚牙片照射会导致微硬度降低，尽管仍在临床可接受水平内。即使将照射时间和/或光强度加倍，透过2毫米或3毫米厚牙片固化的标本的硬度值仍低于临床可接受水平。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/b3ff9602f091/EJD-10-203-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/601187de41b5/EJD-10-203-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/f1c40db77f8f/EJD-10-203-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/b3ff9602f091/EJD-10-203-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/601187de41b5/EJD-10-203-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/f1c40db77f8f/EJD-10-203-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0773/4813436/b3ff9602f091/EJD-10-203-g007.jpg

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