Objectives: Periapical inflammation and pH changes after endodontic surgery could affect hardening and final char- acteristics of retrograde filling materials. The present study analyzes the microhardness of two retrograde filling materials stored into different pH solutions. Materials and methods: 48 discs (24 per material) were pre- pared according to manufacturer instructions and randomly divided in 8 groups (n = 6); they were let harden for 1 (SuperEBA, Bosworth) or 24 h (MTA, Dentsply) into buffered solutions at different pH values (pH=7, pH=6, pH=5 and pH=3). After storage the upper surface of the specimens was polished using a 1200 (10 m) and 2400 (5 m) sandpaper. Microhardness was then measured with a Vickers indenter (VHMT 30, Leica). Collected data were statistically analyzed with Kruskal–Wallis and Conover tests (p < 0.05). Results: Mean hardness values (±SD) were: pH7, MTA=38.59±2.59, SuperEBA=18.46±5.38; pH6, MTA=3.61±0.76, SuperEBA=22.81 ± 5.16; pH5, MTA=4.02 ± 1.57, SuperEBA=20.65 ± 5.49; pH3, MTA=1.21 ± 0.47, Super EBA=21.69 ± 6.10 (data are expressed in HV). Conclusions: Within the limits of the present study MTA showed high sensibility to decreasing pH of the environment, although at pH 7 it showed the greatest microhardness val- ues. SuperEBA maintained constant or increased its hardness with increasing acidity. The pH of the surgical site seems to be relevant for retrograde filling materials, thus postsurgical inflammation should be kept under control.

Microhardness of MTA and SuperEBA in acid solutions

DE BIASI, MATTEO;ANGERAME, DANIELE
2010-01-01

Abstract

Objectives: Periapical inflammation and pH changes after endodontic surgery could affect hardening and final char- acteristics of retrograde filling materials. The present study analyzes the microhardness of two retrograde filling materials stored into different pH solutions. Materials and methods: 48 discs (24 per material) were pre- pared according to manufacturer instructions and randomly divided in 8 groups (n = 6); they were let harden for 1 (SuperEBA, Bosworth) or 24 h (MTA, Dentsply) into buffered solutions at different pH values (pH=7, pH=6, pH=5 and pH=3). After storage the upper surface of the specimens was polished using a 1200 (10 m) and 2400 (5 m) sandpaper. Microhardness was then measured with a Vickers indenter (VHMT 30, Leica). Collected data were statistically analyzed with Kruskal–Wallis and Conover tests (p < 0.05). Results: Mean hardness values (±SD) were: pH7, MTA=38.59±2.59, SuperEBA=18.46±5.38; pH6, MTA=3.61±0.76, SuperEBA=22.81 ± 5.16; pH5, MTA=4.02 ± 1.57, SuperEBA=20.65 ± 5.49; pH3, MTA=1.21 ± 0.47, Super EBA=21.69 ± 6.10 (data are expressed in HV). Conclusions: Within the limits of the present study MTA showed high sensibility to decreasing pH of the environment, although at pH 7 it showed the greatest microhardness val- ues. SuperEBA maintained constant or increased its hardness with increasing acidity. The pH of the surgical site seems to be relevant for retrograde filling materials, thus postsurgical inflammation should be kept under control.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2786926
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact