The Seibert`s classification of edentulous ridge regarding the apico-coronal loss is class:
- a- I
- b- II ***
- c- III
- d- IV
Class I defects-faciolingual loss of tissue width with normal ridge height
Class II defects-loss of ridge height apico-coronal with normal ridge width
Class III defects-a combination of loss in both dimensions.
The correct answer is b- II.
Seibert's classification of edentulous ridge is a system for classifying edentulous ridges based on the amount of bone loss that has occurred in the apico-coronal direction. It is a four-stage classification system, with class I being the least amount of bone loss and class IV being the most.
In class II edentulous ridges, there is moderate apical bone loss. This means that the bone height is reduced, but the buccal and lingual bone plates are still intact.
The other answer choices are not correct:
a- Class I:
Class I edentulous ridges have minimal apical bone loss. This means that the bone height is close to normal, and the buccal and lingual bone plates are still intact.
c- Class III:
Class III edentulous ridges have severe apical bone loss. This means that the bone height is significantly reduced, and the buccal and lingual bone plates may be resorbed.
d- Class IV:
Class IV edentulous ridges have a combination of severe apical bone loss and buccal and lingual plate resorption. This means that the bone height is very low, and the buccal and lingual bone plates are almost completely resorbed.
Therefore, the Seibert's classification of edentulous ridge regarding the apico-coronal loss is class II.
