Effect of temperature on sealing ability and microhardness of mineral trioxide aggregate

doi:10.3877/cma.j.issn.1674-1366.2013.04.003

Abstract

Abstract:

Objective

The aim of this study was to evaluate the effect of temperature on sealing ability and microhardness of mineral trioxide aggregate （MTA）.

Methods

Forty single-rooted human pre-molars were divided into three experimental （n=10） and two control groups （n=5）. The root canals were instrumented and root apices were resected. Root-end cavities were prepared and filled with MTA stored at 5℃， 25℃or 40℃. Microleakage was evaluated using a glucose leakage test. MTA were immediately mixed after removal from storage according to manufacturer's instructions and mixed and packed into cylindrical tubes. Surface microhardness of each specimen was measured.

Results

The highest microleakage were observed in 5℃followed by 25℃and 40℃groups （P＜0.05）. The highest microhardness were observed in 40℃followed by 25℃and 5℃groups （P＜0.05）.

Conclusions

The microleakage of MTA reduces and microhardness increases with the up-regulation of the temperature.Thus MTA with low temperature should be avoided for clinical usage.

Key words: Mineral trioxide aggregate, Microleakage, Temperature, Microhardness

Chun-mei YU, Yi-yun FANG, Yu PAN, Yang WANG, Ju-feng CHEN, Lei WANG. Effect of temperature on sealing ability and microhardness of mineral trioxide aggregate[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2013, 07(04): 271-275.

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https://zhkqyxyjzz.cma-cmc.com.cn/EN/Y2013/V07/I04/271

Figures/Tables 5

References 14

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组别	时间（d）
组别	1	7	14	21	28
低温组	0.009（0.006 ～ 0.011）	0.077（0.057 ～ 0.088）^a	0.261（0.178 ～ 0.328）^a	0.414（0.332 ～ 0.524）^a	0.613（0.424 ～ 1.046）^a
室温组	0.005（0.002 ～ 0.009）	0.033（0.025 ～ 0.044）	0.142（0.112 ～ 0.166）	0.312（0.116 ～ 0.386）^b	0.421（0.298 ～ 0.476）^b
高温组	0.005（0.003 ～ 0.007）	0.032（0.023 ～ 0.039）^c	0.108（0.082 ～ 0.146）^c	0.182（0.074 ～ 0.256）^c	0.208（0.134 ～ 0.302）^c

组别	时间（d）
组别	1	7	14	21	28
低温组	0.009（0.006 ～ 0.011）	0.077（0.057 ～ 0.088）^a	0.261（0.178 ～ 0.328）^a	0.414（0.332 ～ 0.524）^a	0.613（0.424 ～ 1.046）^a
室温组	0.005（0.002 ～ 0.009）	0.033（0.025 ～ 0.044）	0.142（0.112 ～ 0.166）	0.312（0.116 ～ 0.386）^b	0.421（0.298 ～ 0.476）^b
高温组	0.005（0.003 ～ 0.007）	0.032（0.023 ～ 0.039）^c	0.108（0.082 ～ 0.146）^c	0.182（0.074 ～ 0.256）^c	0.208（0.134 ～ 0.302）^c

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