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Informal for a debt security issued by the United States government, as opposed to one of its agencies. Perhaps the most prominent example of a direct security is a U.S. Treasury security. Direct securities are considered risk-free because they are guaranteed by the full faith and credit of the United States government.

direct (federal) government obligation

A debt that is backed by the full taxing power of the U.S. government. Direct obligations include Treasury bills, Treasury bonds, and U.S. savings bonds. These investments are generally considered to be of the very highest quality. See also federal agency security.
References in periodicals archive ?
In the present study, when direct pulp capping with MTA was performed in permanent teeth, there was a clear preference for MTA to be used less often in anterior teeth.
Direct pulp capping with mineral trioxide aggregate: an observational study.
In cases where pulp exposure is inevitable, direct pulp capping may provide an enhanced recovery of the pulp.
Only one clinical study assessing Biodentine[TM] as a restorative material in direct pulp capping has been published to date.
43) Another material used for direct pulp capping is MTA, which has been shown to stimulate formation of dentin bridges adjacent to dental pulp.
2] for direct pulp capping was first introduced, it has been used to improve the inner capability of repairing exposed pulp.
Comparison of effectiveness of MTA and CaOH as direct pulp capping materials.
Key Words: Direct pulp capping (DPC), mineral trioxide aggregate (MTA), calcium hydroxide (CaOH).
Another respondent, who reported teaching non-setting CaOH for direct pulp capping in primary teeth, also taught the use of mineral trioxide aggregate (MTA) for this purpose.
A monkey model was used to study bridging after direct pulp capping with hard-setting CH.
2006] when performing direct pulp capping in human premolars concluded that CH as a pulp capping agent can be used with or without rubber dam isolation.
Direct pulp capping and vital pulpotomy are two accepted clinical modalities to preserve tooth vitality in cases of pulp exposure in carious young permanent teeth but the success rates are often less than 50%.