The authors studied the tissue reaction around the different types of silicone breast mammary envelopes.

In 10 rectangular expanders 6 plates of different rough surface types of envelopes were vulcanized:

Biocell(r). M.S.I.(r), polyurethane. Silimed fine textured. Silimed gross texture. Siltex(r). After the expanders removal the clinical aspects and the microscopic examinations were done in the capsule in contact with the plates and compared with the capsule in contact with the smooth silicone. The polyurethane has an adherence to the capsule. The fibroblastic reaction is greater around the smooth silicone with a greater amount of collagen in a parallel direction. The capsule around the Biocell(r) presents giant cell reaction with silicone particles. The authors concluded that the rough surface envelopes may promote a lesser degree of capsule formation.