Positioning of posterior teeth in complete dentures is
conventionally determined either by arranging them over the crest
of the ridge or by keeping them in the neutral zone. Adopting ridge
crest as a parameter makes the whole process simple but it's not
sure whether that position lies within the neutral zone. Neutral
zone is considered to be an equilibrium position so that the
dentures are not destabilized by the action of adjoining muscles.
Process to find out the neutral zone is laborious and hence
operators avoid it. Incorporation of a functional element in
finding out the position of the posterior teeth is highly desirable
and use of stereognosis seems to be a valid option. An individual
perceives the shapes of the objects by the effective use of tongue.
Normally this ability is used to position food particles
approximately over the teeth. Few studies have been conducted on
stereognostic ability of both dentulous and edentulous individuals
belonging to different age groups. Interestingly local factors in
the oral cavity do not affect the stereognostic ability. In this
context it was thought to use stereognosis as a diagnostic tool in
determining the position of posterior teeth.
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