RESUMEN
Introduction and Objective: To evaluate pH and solubility of MTA Fillapex® cement. Material and methods: Patients were divided into four groups: GI (MTA Fillapex®), GII (Sealer 26®), GIII (Sealapex®) and GIV (AH Plus®). Samples of each group with 10 mm in diameter and 2 mm in height were immersed into water at neutral pH and kept at 37ºC. After 3 hours, the first pH measurement was carried out and repeated at 24 hour intervals for seven days. The data were submitted to Anova (p < 0.05). To analyze the solubility, specimens with 20 mm in diameter and 1.5 mm in thickness were weighed after the setting time, and maintained in distilled water at 37ºC for seven days. After this period, the specimens were again weighed. The difference between their weighs represents the mass loss. The data were subjected to Student's t test for paired samples (p < 0.05). Results: GI and GIII showed pH increase at the first 24 hours, with a significant reduction compared with the other cements. GIV was the smallest mass loss, followed by GII, GIII and GI. Conclusion: MTA Fillapex® has higher solubility than that of resin cements, but its pH remained above 10 for seven days.
RESUMEN
Na endodontia, o conhecimento das propriedades físicas dos cimentos endodônticos faz-se necessário para a realização de um adequado procedimento clínico. Objetivo: no presente estudo, o MTA Fillapex® foi comparado com o Sealer 26®, AH Plus® e Sealapex®, em relação ao escoamento e ao tempo de presa. Materiais e método: para o teste de escoamento, em triplicata, cada cimento foi manipulado e depositado sobre uma placa de vidro e, logo após, foi colocada outra placa de vidro e um peso adicional de 120 g por 10 minutos. Com auxílio de um paquímetro digital, foram medidos os diâmetros maiores e menores dos cimentos, sendo obtida uma média aritmética. Para a obtenção do tempo de presa, em triplicata, cada cimento foi depositado em anéis de PVC. Após 30 min, iniciaram-se as medidas com uma agulha tipo Gillmore de 100 g e 456,3 g, equivalentes ao tempo inicial e final respectivamente, sendo o seu resultado obtido após as marcas das agulhas deixarem de ser visíveis nos cimentos. Resultados: o MTA Fillapex® apresentou uma taxa de escoamento maior do que a dos demais cimentos e chegou à presa inicial em um tempo maior, quando comparado com o AH Plus®, e mais rapidamente que o Sealer 26®. O cimento Sealapex® não tomou presa inicial e o MTA Fillapex® não tomou presa final, o que também foi evidenciado para o Sealapex®. Conclusões: o cimento MTA Fillapex® está de acordo com a ADA quanto ao escoamento, e o tempo de presa inicial foi maior que o descrito pelo fabricante.
In endodontics the knowledge of physical properties of endodontic cements is required to perform an adequate clinical procedure. Objective: in the present study, MTA Fillapex was compared to Sealer 26, AH Plus and Sealapex regarding flow and setting time. Materials and method: for the flow test in triplicate, each cement was manipulated and placed on a glass plate, then another glass plate was placed with an additional weight of 120 g, for 10 minutes. With the aid of a digital caliper the largest and smallest cement diameters were measured, and an arithmetic mean was obtained. To establish the setting time in triplicate, each cement was placed on PVC rings. After 30 minutes the measurements were started with a 100 g and 456.3 g Gillmore-type needle equivalent to the initial and final time respectively. The results were obtained after the brands of the needles were no longer visible in the cements. Results: the MTA Fillapex presented a higher flow rate than other cements, and required more time to set up than AH Plus, but was faster than Sealer 26. The Sealapex cement did not take the initial set, and the MTA Fillapex did not take the final set, which was also evidenced for the Sealapex cement. Conclusions: the MTA Fillapex cement is in compliance with the ADA in regards to flow, and the initial setting time was longer than that described by the manufacturer.