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单词 Crown root ratio
释义

Crown root ratio

英语百科

Crown-to-root ratio

(重定向自Crown root ratio)
This X-ray film reveals a poor crown-to-root ratio for tooth #21 (right), the lower left first premolar.  The tooth exhibits 50% bone loss, adding roughly 5-7 mm to the clinical crown of what is actually anatomical root.  The fulcrum, existing somewhere immediately apical to the height of the bone, does not allow for any adjacent bone to avoid compression or tension, resulting in virtually complete widening of the PDL and a grim prognosis, due to secondary occlusal trauma.
This X-ray film displays horizontal bone loss of the mandible, in the lower right quadrant.  Although the two premolars and the molar exhibit moderate to severe bone loss, there was no tooth mobility at the time this film was taken.
Models of human teeth as they exist within the alveolar bone.  The roots, as they can be seen through the transparent

Crown-to-root-ratio is the ratio of the length of the part of a tooth that appears above the alveolar bone versus what lies below it. It is an important consideration in the diagnosis, treatment planning and restoration of teeth, one that hopefully guides the plan of treatment to the proper end result.

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更新时间:2025/6/22 1:01:28