A 2010  overview  on the subject is in attachment. Anyway, in my personal experience, most of the difficult SB recrossing cases can be solved simply overdilating the proximal part of the stent.   In some cases, when only the tip of the guidewire enters the SB cell but you cannot advance the rest of the guidewire due to prolapse, I inflate a balloon in the distal part of the MB stent. The same can be done when the balloon cannot be advanced though the SB cell. 

thank you for your answer and  paper. In the paper, coronary bifurcation stent are recommended, which I am interesting in. however, coronary bifurcation stent are stil applied in china. In the department of cardiology of Harbin Medical University, some techniques such as modeling of guidewire tip, antegrade wire technique，retrograde wire technique, the ballon you mentioned, and so on are often utilized.