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midtlinjen

midtlinjen, literally meaning “the midline” in Danish, is a term used across several disciplines to denote a central line or segment that divides a figure or the body into halves. Its meaning varies with context but shares the common idea of a central reference line.

In geometry, the midline refers to a segment joining the midpoints of two sides of a polygon.

In anatomy, the term midline often refers to the sagittal midline or midsagittal plane, which divides the

In dentistry, the dental midline is the vertical line that ideally passes between the upper central incisors

The concept of midlinjen thus appears in mathematics, medicine, and dental care, always centered on a pivotal

In
a
triangle,
the
midline
connects
the
midpoints
of
two
sides,
is
parallel
to
the
third
side,
and
its
length
equals
half
the
length
of
that
side.
In
a
trapezoid,
the
midline
connects
the
midpoints
of
the
nonparallel
sides
(the
legs)
and
has
a
length
equal
to
the
average
of
the
two
bases.
These
properties
are
used
to
derive
other
relations
and
simplify
area
calculations.
body
into
left
and
right
halves.
This
reference
line
is
important
in
imaging,
neurosurgery,
and
clinical
examination.
Deviations
from
the
midline,
such
as
a
midline
shift,
can
indicate
pathology
and
influence
diagnostic
or
treatment
decisions.
and
aligns
with
the
corresponding
line
through
the
lower
centrals.
It
is
used
to
assess
occlusion
and
facial
symmetry;
deviations
can
affect
aesthetics
and
function
and
are
commonly
addressed
with
orthodontic
or
restorative
treatment.
line
that
anchors
measurements,
alignment,
or
symmetry.