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retraction


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n.1. (in obstetrics) the state of uterine muscle fibres remaining shortened after contracting during labour. This results in a gradual progression of the fetus downwards through the pelvis. The basal portion of the uterus becomes thicker and pulls up the dilating cervix over the presenting part. 2. (in dentistry) the drawing back of one or more teeth into a better position by an orthodontic appliance.

1. (in obstetrics) the state of uterine muscle fibres remaining shortened after contracting during labour. This results in a gradual progression of the fetus downwards through the pelvis. The basal portion of the uterus becomes thicker and pulls up the dilating cervix over the presenting part. 2. (in dentistry) the drawing back of one or more teeth into a better position by an orthodontic appliance.


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