ThanksCheryl.
A cross bite and high arch are definitely tell-tale signs of a narrow upper arch. The upper teeth should be outside the lower teeth when they meet together, like the lid covering the base of a box. A cross bite occurs when one or more of the upper teeth is inside the lower teeth, when biting, usually due to the narrowness of the upper arch.
I'm keen to get measurements of your upper arch, (and others), while somebody else can measure It intraorally with a ruler, it is most accurate if you have a model of your arch. Need to take an impression, though.
One of my colleagues has suggested that I should write an article and submit it to a dental journal, but I don't have access to a database, any suggestions?



Jack.