Normal versus ideal:
In humans Normal implies variation around an
average or a mean, therefore normal is always a range
and never a fixed value, for example one cannot state a
solid figure for normal men height, but it is accepted
to say that normal height could be between 150 cm to
190 cm for instance.
In addition normality changes with age
therefore it is dynamic and indicates
biological adaptability. For example
presence of a diastema is normal during the
ugly duckling stage but not in an adult
An occlusion is considered to be normal when all
the teeth are present and occlude in a healthy
stable and pleasing manner.
On the other hand ideal connotes a hypothetical
concept rarely found in clinical practice
dictionary definition refers to the act
of closure or being closed.
The normal relation of the occlusal
inclined planes of the teeth when the jaws
are closed. (According to Dr. Angle, normal
occlusion exists when the mesiobuccal
cusp of the upper first molar occludes with
the buccal groove of the lower first molar).