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B. BER, and R. LEMON, Louisiana State University School of Dentistry, New Orleans, USA
Objective: Mineral Trioxide Aggregate (MTA) is a recently introduced dental material that has been reported to produce excellent sealibility and biocompatibility. Although the biologic properties of MTA have been thoroughly tested, problems still exist with the clinical delivery of the material. The handling characteristics of MTA are similar to Portland cement, or a sand-and-water mixture. The material is different than other dental materials and delivery devices for these materials do not perform well with delivery of MTA. The purpose of this study is to evaluate any effect on the physical properties of set MTA after delivery with a prototype ultrasonic carrier. Methods and Results: Results from compressive strength testing (Instron) and Vickers's hardness tests were compared for 7 and 28 day samples of MTA mixed and placed either ultrasonically or by manufacturer's directions. Ultrasonic placement of MTA significantly increases compressive strength and hardness (p<.05) compared to controls. Conclusions: Therefore the ultrasonic placement method does not have a negative effect on the tested properties of MTA.
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Application Method |
C.S.* 7 day |
C.S.* 28 day |
V.H.** 7 day |
V.H.** 28 day |
|
Manufacture |
48.40±14.88 |
84.83±27.65 |
45.07±3.92 |
60.80±6.59 |
|
Ultrasonic |
91.61±12.74 |
113.39±26.24 |
59.65±5.61 |
76.88±3.61 |
*=Compressive Strength (MPa) **=Vickers's Hardness (mm ²/kg) |