TorqueScript doesnt use traditional arrays, they are all just variable names
$Array[1] = "Line1";
$Array2 = "Line2";
echo($Array1);
echo($Array[2]);
prints:
Line1
Line2
so in your case, you will use something like:
if ($qualityBrickDB[%a] = %brick.getDatablock() )
{
echo($qualityBrickDB[%a] );
}