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Effect of varying water-to-powder ratios on the setting expansion of white and gray mineral trioxide aggregate.

Abstract：

INTRODUCTION:Clinicians commonly mix mineral trioxide aggregate (MTA) to a desired consistency rather than use the recommended amounts of powder and water. The purpose of this in vitro study was to evaluate how varying the water-to-powder (WP) ratio affects the setting expansion of white MTA (WMTA) and gray MTA (GMTA). METHODS:Eight combinations (n = 5) of WMTA and GMTA were mixed using varying WP ratios. Randomized samples were placed in a linear variable displacement transformer and submerged under Hank's balanced salt solution for 25 hours. Expansion was compared using a 2-way analysis of variance (alpha = 0.05). RESULTS:Mean percent expansions ranged from 0.058%-0.093% for WMTA and 2.15%-2.56% for GMTA. GMTA expanded significantly more than WMTA at p = .001. No differences in expansion were found between WP ratios (p = .218). No significant interaction was found between the WP ratio and material type (p = .228). CONCLUSIONS:GMTA expanded significantly more than WMTA; however, varying the WP ratio did not affect the setting expansion.

journal_name

J Endod

journal_title

Journal of endodontics

authors

Hawley M,Webb TD,Goodell GG

doi

10.1016/j.joen.2010.03.010

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

1377-9

issue

8

eissn

0099-2399

issn

1878-3554

pii

S0099-2399(10)00200-1

journal_volume

36

pub_type

杂志文章,随机对照试验

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