I am truly sorry to hear of your brother's problem as well as yours. I had some terrible problems with swelling and aching joints several months before I entered dental school, but no one diagnosed me. I visited doctors of varying specialties, and my serology was negative, so they really had nothing to go on. After suffering for months, the pain all of a sudden stopped. From May to the end of September the year of my matriculation, I did not have any pain. As a matter of fact, I was pain free until we started drawing/carving teeth in Tooth Morphology. Then...well, it was all downhill from there. I had pain not only in my knuckles, wrists, elbows, and shoulders, but I also had it in my neck. The daily labor of laboratory activities took its toll on me. I managed to get through the first semester's basic sciences, but I had to take an "I" in my dental science course. During the second semester, things only got worse for me. However, towards the end of April, I found a Rheumatologist who diangosed me with a classic "paper" case of RA because I had all the symtoms, but negative serology. So, I was put on all the so called RA drugs, and they helped to some extent, but the pain did not lessen. So, I made the decision to withdraw from dental school and my school granted me administrative withdrawal from the remainder of my courses due to my problem. I ended up moving back home...depressed no doubt...still in pain, but not as bad. It was very difficult trying to learn anatomy, tooth morphology, occlusion, neuroscience, microbiology, and more while in terrible pain...in addition to trying to finish the lab work from the 1st and 2nd semesters, keeping in mind that I did not receive any relief from my pain until April. I am a truly optimistic person, but sometimes you must look at ALL your options. The person who mentioned liability insurance in dead on...it is a must. The dean at my school told me that I would HAVE to take precautions since I have a diagnosed condition.
So, years later, after teaching English at a community college, eating very, very healthy (mostly natural diet and very little sugar), taking Glucosamine, exercising, using various rubs and therapies, and never fogetting my desire to work in the dental sciences, I am waiting to get cleared to return to dental school. I just wanted to post that although you (or anyone) may have some obstacles, a "handicap" can be overcome if you are diligent and recognize the signs your body gives. You just have to find what works for you. As for me, I am trying to get through school so I can teach in the dental field. There are so many things one can do if the hands will not allow him/her to practice day-in, day-out dentistry tasks. Best wishes to you and your brother, and please do not hesistate to contact me if you need any advice. Take care