1. The flow cuvette for measurements of hydraulic permeability of dentin samples comprising: a) an intake passage b) an outlet port fluidly connected to the inlet channel c) at least one dentin sample fixing mechanism, which is located between the inlet and outlet channels and for fixing dentin sample and d) at least one relief channel, which has an inner opening from which the bleed passage extends in the direction of the flow cell, and this relief channel for receiving air in the form of at least one of the air bubble that can accumulate under the sample dentin fixed in the retention mechanism, after the inlet for liquid to be fed into the flow cell, wherein the bleed passage forms a positive angle θ with the lower side horizontal transverse plane cross section drawn through a lower component of the cell, wherein the horizontal cross-sectional plane intersects the inner bore of the discharge channel so that the angle θ larger than 0 ° and less than about 90 °, with θ the angle measured in a counterclockwise direction from the lower side of the horizontal cross-sectional plane, and its vertex is at the point of intersection of the inner hole and the horizontal cross secheniya.2. Flow Cell according to Claim. 1, wherein the angle θ is in the range from about 15 ° to about 75 ° .3. Flow cell according to claim. 2, wherein the angle θ is in the range of from about 35 ° to about 55 ° .4. Flow Cell according to Claim. 1 further comprising a secondary relief1. Проточная кювета для измерения гидравлической проницаемости образцов дентина, содержащая:a) впускной каналb) выпускной канал, гидравлически соединенный со впускным каналомc) по меньшей мере один фиксирующий образец дентина механизм, который расположен между впускным и выпускным каналами и предназначен для закрепления образца дентина иd) по меньшей мере один сбросной канал, который имеет внутреннее отверстие, от которого сбросной канал продолжается в направлении от проточной кюветы, причем этот сбросной канал предна
