Physical and Chemical Properties of a New Mineral Trioxide Aggregate Material

The objective of this study was to compare the time to final set and compressive strength of the white mineral trioxide aggregate (MTA) formulation to the original grey MTA. To test compressive strength, each MTA formulation was placed into Teflon split molds for four hours at 37° Celsius (C) and 100% humidity. Compressive strength of both MTA formulations was measured at 24 hours (n=12) and 21 days (n=19) using an Instron Testing Machine. For determination of time to final set, each MTA formulation (n=6) was placed into a metal mold and maintained at 37° C and 100% humidity while setting. At five-minute time intervals, an indenter needle was lowered onto the surface of the MTA material and allowed to remain in place for five seconds before it was removed from the specimen surface. This process was repeated until the needle failed to make a complete circular indentation in the MTA specimen. Results of a two-way ANOVA indicate that white MTA had a significantly higher compressive strength (mean=32.7 MPa) than grey MTA (mean=25.2 MPa) at 24 hours and no statistically significant differences at 21 days (white mean=38.6 MPa and grey mean=38.0 MPa). Using one-way ANOVA, results indicate that grey MTA had a significantly longer time to final setting time (mean=296 min) compared to white MTA (mean=276 min). Based on this study, the results suggest that white MTA is an effective substitute for grey MTA.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Endodontics

Year dc:date.available

2004

Author dc:creator

• Spencer, David Lowell

Contributors dc:contributor

• Dr. B. Ellen Byrne

• mta
• mineral trioxide aggregate
• root end filling material
• root canal
• Dentistry
• Endodontics and Endodontology
• Medicine and Health Sciences

Statement dc:rights

• © The Author

Identifier

https://scholarscompass.vcu.edu/etd/647

OAI identifier oai:identifier

oai:scholarscompass.vcu.edu:etd-1646