J Korean Acad Conserv Dent.  2010 Nov;35(6):445-452. 10.5395/JKACD.2010.35.6.445.

Physical properties of novel composite using Portland cement for retro-filling material

• Lee SJ
• Cho OI
• Yum J
• Park JK
• Hur B
• Kim HC

• KMID: 2176466
• DOI: http://doi.org/10.5395/JKACD.2010.35.6.445

Abstract

OBJECTIVES
The aim of this study was to compare apical sealing ability and physical properties of MTA, MTA - AH-plus mixture (AMTA) and experimental Portland cement - Epoxy resin mixture (EPPC) for a development of a novel retro-filling material.
MATERIALS AND METHODS
Forty-nine extracted roots were instrumented and filled with gutta-percha. Apical root was resected at 3 mm and the retro-filling cavity was prepared for 3 mm depth. Roots were randomly divided into 3 groups of 15 roots each. The retro-filling was done using MTA, AMTA, and EPPC as the groups divided. Four roots were used as control groups. After setting in humid condition for 24 hours, the roots were immersed in 1% methylene blue dye solution for 72 hours to test the apical leakage. After immersion, the roots were vertically sectioned and photos were taken to evaluate microleakage. Setting times were measured with Vicat apparatus and digital radiographs were taken to evaluate aluminum equivalent thickness using aluminum step wedge. The results of microleakage and setting time were compared between groups using one-way ANOVA and Scheffe's post-hoc comparison at the significance level of 95%.
RESULTS
AMTA and EPPC showed less microleakage than MTA group (p < 0.05). AMTA showed the highest radio-opacity than other groups and the novel EPPC showed 5 mm aluminum thickness radio-opacity. EPPC showed the shortest initial and final setting times than other groups while the MTA showed the longest (p < 0.05).
CONCLUSIONS
Under the condition of this study, the novel composite using Portland cement-Epoxy resin mixture may useful for retro-filling with the properties of favorable leakage resistance, radio-opacity and short setting time.

Keyword

Epoxy resin; MTA; Portland cement; Radio-opacity; Retro-filling; Setting time

MeSH Terms

Aluminum
Glutamates
Guanine
Gutta-Percha
Immersion
Methylene Blue
Pemetrexed
Aluminum
Glutamates
Guanine
Gutta-Percha
Methylene Blue

Figure

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  Figure 1 Aluminum step-wedge used in this study and representative digital radiograph image.

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  Figure 2 Representative samples from each group with dye leakage score. MTA specimen shows leakage with score 2 and AMTA and EPPC specimens show no leakage. MTA, mineral trioxide aggregate; AMTA, AH-plus mixture; EPPC, epoxy resin mixture.

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  Figure 3 Representative samples of radiograph from each group with aluminum step wedge (Left; MTA with 6 mmAl, Mid; AMTA with 10 mmAl, and Right; EPPC with 5 mmAl). MTA, mineral trioxide aggregate; AMTA, AH-plus mixture; EPPC, epoxy resin mixture.

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