the volume of fluid injected into the tissue expander and the tissue expansion

background: replacement of the lost tissue is the major concerns of the plastic surgeons. expanded area should be coherent with the surrounding tissue. tissue expansion technique is the reforming methods the skin tissue scarcities. several methods for tissue expansion are available; including usage of silicon balloon and injecting fluid into the tissue expander. materials and methods: in a clinical trial study, 35 patients, with burn scars, in the face, skull and neck area were studied. we provided a tissue expander device with capacities of 125, 250 and 350cc. fluid was injected inside the device, 3 consecutive weeks with 1-week interval. after 3 months the device was set out and the tissue expansion was measured using a transparent board and the results were analyzed. multiple regression was done by spss 20 to analyze the data. results: regression model showed skin expansion was positively correlated with the volume of the injected fluid. for each centimeter square of skin expansion, about 6-8 ml of fluid must be injected. conclusion: correction of skin defects resulting from burning scar is possible using tissue expanders. the tissue expansion is correlated with the amount of the injected fluid.