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

Article information

Restor Dent Endod. 2010;35(6):445-452

Publication date (electronic) : 2010 November 30

doi : https://doi.org/10.5395/JKACD.2010.35.6.445

Sang-Jin Lee, DDS, MS , Ok-In Cho, DDS, MS , Jiwan Yum, DDS, MS , Jeong-Kil Park, DDS, PhD , Bock Hur, DDS, PhD , Hyeon-Cheol Kim, DDS, PhD

Department of Conservative Dentistry, Pusan National University School of Dentistry, Yangsan, Korea.

Correspondence to Hyeon-Cheol Kim, DDS, PhD. Associate Professor, Department of Conservative Dentistry, Pusan National University School of Dentistry, 3-3 Beomeo-ri, Mulgeum, Yangsan, Korea 626-810. TEL, +82-55-360-5222; FAX, +82-55-360-5214; golddent@pusan.ac.kr

Received 2010 June 04; Revised 2010 August 24; Accepted 2010 August 30.

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.

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

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Article information Continued

Figure 1

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

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.

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.

Table 1

Experimental groups

MTA, mineral trioxide aggregate; AMTA, AH-plus mixture; EPPC, epoxy resin mixture.

Table 2

Leakage score, setting time (min) and aluminum equivalent radio-opacity (mmAl)

MTA, mineral trioxide aggregate; AMTA, AH-plus mixture; EPPC, epoxy resin mixture.

^a,b,c; Different superscripts means significant differences between groups in vertical row (p < 0.05).