The influence of particle size and curing conditions on testing mineral trioxide aggregate cement

Ha, William Nguyen, Kahler, Bill and Walsh, Laurence James (2016) The influence of particle size and curing conditions on testing mineral trioxide aggregate cement. Acta Biomaterialia Odontologica Scandinavica, 2 1: 130-137. doi:10.1080/23337931.2016.1239181

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Author Ha, William Nguyen
Kahler, Bill
Walsh, Laurence James
Title The influence of particle size and curing conditions on testing mineral trioxide aggregate cement
Journal name Acta Biomaterialia Odontologica Scandinavica   Check publisher's open access policy
ISSN 2333-7931
Publication date 2016-10-05
Year available 2016
Sub-type Article (original research)
DOI 10.1080/23337931.2016.1239181
Open Access Status File (Publisher version)
Volume 2
Issue 1
Start page 130
End page 137
Total pages 8
Place of publication Abingdon, Oxfordshire United Kingdom
Publisher Taylor & Francis
Language eng
Abstract Objectives: To assess the effects on curing conditions (dry versus submerged curing) and particle size on the compressive strength (CS) and flexural strength (FS) of set MTA cement. Materials and methods: Two different Portland cements were created, P1 and P2, with P1 < P2 in particle size. These were then used to create two experimental MTA products, M1 and M2, with M1 < M2 in particle size. Particle size analysis was performed according to ISO 13320. The particle size at the 90th percentile (i.e. the larger particles) was P1: 15.2 μm, P2: 29.1 μm, M1: 16.5 μm, and M2: 37.1 μm. M2 was cured exposed to air, or submerged in fluids of pH 5.0, 7.2 (PBS), or 7.5 for 1 week. CS and FS of the set cement were determined using a modified ISO 9917-1 and ISO 4049 methods, respectively. P1, P2, M1 and M2 were cured in PBS at physiological pH (7.2) and likewise tested for CS and FS. Results: Curing under dry conditions gave a significantly lower CS than when cured in PBS. There was a trend for lower FS for dry versus wet curing. However, this did not reach statistical significance. Cements with smaller particle sizes showed greater CS and FS at 1 day than those with larger particle sizes. However, this advantage was lost over the following 1-3 weeks. Conclusions: Experiments that test the properties of MTA should cure the MTA under wet conditions and at physiological pH.
Formatted abstract
Objectives: To assess the effects on curing conditions (dry versus submerged curing) and particle size on the compressive strength (CS) and flexural strength (FS) of set MTA cement.

Materials and methods: Two different Portland cements were created, P1 and P2, with P1 < P2 in particle size. These were then used to create two experimental MTA products, M1 and M2, with M1 < M2 in particle size. Particle size analysis was performed according to ISO 13320. The particle size at the 90th percentile (i.e. the larger particles) was P1: 15.2 μm, P2: 29.1 μm, M1: 16.5 μm, and M2: 37.1 μm. M2 was cured exposed to air, or submerged in fluids of pH 5.0, 7.2 (PBS), or 7.5 for 1 week. CS and FS of the set cement were determined using a modified ISO 9917-1 and ISO 4049 methods, respectively. P1, P2, M1 and M2 were cured in PBS at physiological pH (7.2) and likewise tested for CS and FS.

Results: Curing under dry conditions gave a significantly lower CS than when cured in PBS. There was a trend for lower FS for dry versus wet curing. However, this did not reach statistical significance. Cements with smaller particle sizes showed greater CS and FS at 1 day than those with larger particle sizes. However, this advantage was lost over the following 1–3 weeks.

Conclusions: Experiments that test the properties of MTA should cure the MTA under wet conditions and at physiological pH.
Keyword Compressive strength
Curing medium
Flexural strength
MTA
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
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Created: Wed, 01 Feb 2017, 12:16:32 EST by Professor Laurence Walsh on behalf of School of Dentistry