Ummm, Hmmmm, well I may use any fingers to bend with in any sort of combination-However I will rarely try to bend a string with my pinkie finger. Seems my best tones are achieved using the ring and supporting with the middle as was stated earlier by Zeppelin, Benoit and others.
I Love a sweet bend! Remember to bend in key. Practice them, they are but one of my favorite techniques.
Above all have a good time!
Stringbender