inverted breve accent in math mode

Is there a math mode accent giving an inverted breve? I have tried \stackrel{frown}{x}, but the alignment and spacing are all wrong when compared to \breve{x}.

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Using Psirus's idea:

\usepackage[T3,T1]{fontenc}
\DeclareSymbolFont{tipa}{T3}{cmr}{m}{n}
\DeclareMathAccent{\invbreve}{\mathalpha}{tipa}{16}

\begin{document}
$\invbreve{x}$
\end{document}


One has to load fontenc and specify the T3 encoding; if T1 is not desired, say \usepackage[T3,OT1]{fontenc} so as to get OT1 as the default encoding.

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Personally, I had good success with \wideparen from the MnSymbol package (table 173). –  thecommexokid Feb 16 '12 at 7:02