The effect of mixing method on tricalcium silicate-based cement.
Int Endod J
; 51(1): 69-78, 2018 Jan.
Article
em En
| MEDLINE
| ID: mdl-28370026
ABSTRACT
AIM:
To evaluate the effect of three methods of mixing on the physical and chemical properties of tricalcium silicate-based cements.METHODOLOGY:
The materials evaluated were MTA Angelus and Portland cement with 20% zirconium oxide (PC-20-Zr). The cements were mixed using a 3 1 powder-to-liquid ratio. The mixing methods were manual (m), trituration (tr) and ultrasonic (us) activation. The materials were characterized by means of scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy. Flowability was analysed according to ANSI/ADA 57/2012. Initial and final setting times were assessed following ASTM C266/08. Volume change was evaluated using a micro-CT volumetric method. Solubility was analysed according to ADA 57/2012. pH and calcium ion release were measured after 3, 24, 72 and 168 h. Statistical analysis was performed using two-way analysis of variance. The level of significance was set at P = 0.05.RESULTS:
The SEM analysis revealed that ultrasonic activation was associated with a homogeneous distribution of particles. Flowability, volume change and initial setting time were not influenced by the mixing method (P > 0.05). Solubility was influenced by the mixing method (P < 0.05). For pH, at 168 h, significant differences were found between MTA-m and PC-20-Zr-m (P < 0.05). For calcium ion release, PC-20-Zr-tr had higher values than MTA-m at 3 h, and MTA-tr had higher values than PC-20-Zr-m at 168 h (P < 0.05).CONCLUSIONS:
The ultrasonic and trituration methods led to higher calcium ion release and pH compared with manual mixing for all cements, whilst the ultrasonic method produced smaller particles for the PC-20-Zr cement. Flow, setting times and volume change were not influenced by the mixing method used; however, it did have an impact on solubility.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Silicatos
/
Compostos de Cálcio
/
Cimentos Dentários
Limite:
Humans
Idioma:
En
Revista:
Int Endod J
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Brasil