time, since the adhesive was placed without any difficulty and showed fast polymerization, regardless of the presence of saliva or bleeding. Also, the authors observed that tissue repair occurred normally, without any untoward events.

Santos et al. (1990) carried out a histopathological study on tissue repair in wounds produced in the back of rats and compared suture with the application of the ethyl cyanoacrylate tissue adhesive. ^[@r03]^ Two incisions were performed in the back of 24 rats, one was sutured and the other was submitted to application of ethyl cyanoacrylate. The incisions were analyzed one, three, five, and seven days after the surgery. The authors verified that the adhesive showed to be less aggressive than the suture in the initial stage of the repair process; however, in the finalsynthetic resin member (corresponding to the under-fill) adhering to the first semiconductor element and the substrate at the inside of the first semiconductor element as seen in the stacking direction, while a synthetic resin (for example, corresponding to the under-fill) whose Young""s modulus is not less than Young""s modulus of the synthetic resin member is prevented from adhering to the second semiconductor element and the substrate at the inside of the second semiconductor element as seen in the stacking direction, since a connecting rigidity between the first semiconductor element and the substrate connected to each other through bumps is made more than a connecting rigidity between the second semiconductor element and the substrate connected to each other through bumps, by reinforcing the connecting rigidity between the first semiconductor