Effect of acid-etching procedure on selected physical properties of mineral trioxide aggregate

被引:84
作者
Kayahan, M. B. [2 ]
Nekoofar, M. H. [1 ,3 ]
Kazandag, M. [2 ]
Canpolat, C. [4 ]
Malkondu, O. [4 ]
Kaptan, F. [2 ]
Dummer, P. M. H. [1 ]
机构
[1] Cardiff Univ, Sch Dent, Endodontol Res Grp, Cardiff CF14 4XY, S Glam, Wales
[2] Yeditepe Univ, Fac Dent, Dept Endodont, Istanbul, Turkey
[3] Univ Tehran, Fac Dent, Dept Endodont, Tehran, Iran
[4] Yeditepe Univ, Fac Dent, Dept Prosthodont, Istanbul, Turkey
关键词
acid etch; compressive strength; pH; SEM; Vickers surface micro hardness; GLASS-IONOMER CEMENTS; END FILLING MATERIAL; SEALING ABILITY; PORTLAND-CEMENT; RETENTION CHARACTERISTICS; SETTING PROPERTIES; ROOT PERFORATIONS; BOND STRENGTH; PH; MTA;
D O I
10.1111/j.1365-2591.2009.01610.x
中图分类号
R78 [口腔科学];
学科分类号
100302 [口腔临床医学];
摘要
P>Aim To evaluate the effect of acid-etch procedures on the compressive strength and surface microhardness of tooth-coloured mineral trioxide aggregate (MTA). Methodology White ProRoot MTA (Dentsply Tulsa Dental) was mixed and packed into cylindrical tubes of 4 mm in diameter and 6 mm in height. Three groups, each of 15 specimens were subjected to an acid-etch procedure either 4, 24 or 96 h after mixing. The compressive strength was measured and compared with unetched control groups. Differences between groups were analysed using the Kruskall-Wallis test. A further batch of cylindrical specimens of 6 mm in diameter and 12 mm in height were prepared for testing surface microhardness. Three groups of 15 specimens were subjected to the acid-etch procedure at either 4, 24 or 96 h following mixing. Data were subjected to one-way anova. Changes in the surface microstructure before and after the acid-etch procedures were analysed using a scanning electron microscope (SEM). Results There was a general trend for the compressive strength and surface microhardness of specimens to increase with time. In terms of compressive strength, the increase was significant between 4 h and the other time periods for both experimental and control groups (P < 0.0001); however, there was no significant difference between 24 and 96 h. The increase in surface microhardness was significant between 4, 24 and 96 h (P < 0.0001). In addition, there was a significant difference between experimental and control groups at all time periods (P < 0.0001). SEM examination revealed morphological differences between the intact and the etched MTA surfaces. Conclusions Acid-etch procedures affected the compressive strength and surface microhardness of ProRoot MTA. This indicates that it may be better to postpone restorative procedures for at least 96 h after mixing MTA. Etching created surface changes that might have the potential to enhance bonding of resinous materials.
引用
收藏
页码:1004 / 1014
页数:11
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