Clarifications: As it turns out, I indeed had a wrong impression in the previous blog entry (April 18 2011). We are not permanently finished expanding the appliance laterally. It is only a temporary halting. Her explanation of pleasant surprise was genuine, however. She said I have made unusually fast progress. The temporary halting of lateral expansion has been ordered so that we can allow other growth areas to 'catch up' with the lateral growth that has occurred.
Something else that can use some clarification: I had mentioned the 2mm lateral expansion that has occurred at the C5 position such that there is now a (self measured) 34mm gap between those molars (see December 19, 2010 and April 18, 2011 posts). However I learned today that in my case, since I had my premolars removed as a child, C5 as shown in the diagram is not necessarily my proper measuring position. Again, I say in my case. Others should not extrapolate what is correct for them in this regard. In the future, I will not report any self-measuring, and I will just rely on the doctor to measure and judge the growth.
Progress: While we have not increased the width of the appliance for a few weeks, we have continued to advance the fore (anterior) portion of the appliance once a week (today being one of those days), thus moving my front teeth ever so slightly more in line. Today the doctor took photos of my bite (revealing quite a mismatch between my uppers and lowers, since my uppers have moved so much by now). She is sending the photos to Dr. Singh, and has ordered that next week, we are going to take new impressions of the uppers and lowers. All of which leads us to......
A New Phase: It is no longer a matter of guessing. I will be getting a lower appliance. I don't know a thing about it yet, so I'm not going to speculate. But the overview is, as I understand it, that we must get the lower teeth to 'catch up' with the position of the uppers, just as we are currently getting the upper front teeth to catch up with the lateral expansion. There may be more lateral expansion of the uppers later, but we need to work on the lowers first, so that the bite does not become wildly mismatched in the process.