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The relationship between dilation and internal friction is typically illustrated by the sawtooth model of dilatancy where the angle of dilation is analogous to the angle made by the teeth to the horizontal. Such a model can be used to infer that the observed friction angle is equal to the dilation angle plus the friction angle for zero dilation.
A set of Hegar dilators, from Hegar 4 to 17 (right to left) Hegar dilators are dilators used to treat vaginismus and induce cervical dilation, and for inflatable penile implant procedures, though for penile implants it has been shown that outcomes are better without dilation. [1] [2] [3] [4]
Uterine dilators of Hegar type, from diameters 4 mm (right) to 17 mm (left). These sounds are intended for probing a woman's uterus through the cervix, to measure the length and direction of the cervical canal and uterus. Dilators are primarily used to open and dilate the cervix to gain access to the uterine cavity, but can also be used as sounds.
Over time, the osmotic dilator absorbs fluid and swells to 3-4 times the initial diameter. [9] Most of the increase in size occurs within 6 hours after the dilator are placed in the cervix, though further expansion will continue over 12–24 hours. [7] The number of osmotic dilators placed depends on the degree of cervical dilation that is sought.
Dilation (operator theory), a dilation of an operator on a Hilbert space; Dilation (morphology), an operation in mathematical morphology; Scaling (geometry), including: Homogeneous dilation , the scalar multiplication operator on a vector space or affine space; Inhomogeneous dilation, where scale factors may differ in different directions
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The entrance pupil is typically about 4 mm in diameter, although it can range from as narrow as 2 mm (f /8.3) in diameter in a brightly lit place to 8 mm (f /2.1) in the dark as part of adaptation. In rare cases in some individuals are able to dilate their pupils even beyond 8 mm (in scotopic lighting, close to the physical limit of the iris.