A Quantitative Comparison of the Fill Density of MTA Produced by Two Placement Techniques

doi:10.1016/j.joen.2005.08.008

Journal of Endodontics

Volume 32, Issue 5, May 2006, Pages 456-459

https://doi.org/10.1016/j.joen.2005.08.008 Get rights and content

Abstract

This study compared the fill density of mineral trioxide aggregate (MTA) produced by hand condensation with that produced by hand condensation with indirect ultrasonic (US) activation. Sixty acrylic blocks with straight or curved canals were instrumented to an apical size 45, and weighed with a digital electronic balance. In 30 randomly chosen specimens, the canal was filled with MTA by hand condensation and weighed. The MTA was removed; the canal was rinsed and dried, and refilled using hand condensation with indirect US activation. In the other 30 specimens, the procedure was carried out identically but in reverse order. The blocks were then reweighed. The weight of the MTA fill produced by the two placement methods in the two canal configurations was analyzed by a two-way ANOVA. Hand condensation with indirect US activation resulted in an MTA fill that was statistically significantly heavier, and thus denser, than that accomplished by hand condensation alone in both curved and straight canals (p < 0.0001).

Section snippets

Preparation of the Samples

There were 30 transparent acrylic blocks with 30-degree curved canals and 30 blocks with straight canals (Pecina & Associates, Waukegan, IL) used. The blocks with straight canals were designated as group S and those with curved canals as group C. For the straight canals, the working length was determined by placing a #15 Flexofile (Denstply Maillefer, Johnson City, TN) into the root canal until it was visible at the reservoir located at the apical end of the canal; 1.0 mm was then subtracted

Results

In every sample in both groups C and S, the use of 1 s of indirect ultrasonic activation resulted in a greater fill density than that achieved using hand condensation alone (Fig. 2). The mean weight increases of the MTA using the two placement methods in the two canal types are presented in Table 1. There was a statistically significant increase in weight of MTA in the US group over the hand condensation group in both group S (p < 0.0001) and group C (p < 0.0001). In group S there was a mean

Discussion

According to its MSDS (19), MTA consists of approximately 75% Portland cement, with the addition of 5% gypsum to control the setting time (20) and 20% barium sulfate to effect radiopacity (3). Studies analyzing MTA and Portland cement have concluded that with the exception of the added bismuth there is no significant difference in elemental composition between the materials (21, 22). From a therapeutic standpoint, both materials show similar results when used for pulp capping (23, 24), similar

Acknowledgments

This study was funded in part by the Alexander Fellowship. We would like to thank Tulsa Dentsply for their generosity in providing the MTA used in this project.

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Citation Excerpt :
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Basic research—technologyA Quantitative Comparison of the Fill Density of MTA Produced by Two Placement Techniques

Abstract

Section snippets

Preparation of the Samples

Results

Discussion

Acknowledgments

J Endod

Oral Surg Oral Med Oral Pathol Oral Radiol Endod

J Endod

J Endod

Oral Surg Oral Med Oral Pathol Oral Radiol Endod

J Endod

J Endod

J Endod

J Endod

J Endod

J Endod

J Endod

J Endod

J Endod

J Endod

Dental Materials

Dental Materials

Oral Surg Oral Med Oral Pathol Oral Radiol Endod

Basic research—technology
A Quantitative Comparison of the Fill Density of MTA Produced by Two Placement Techniques