The flaps are classified as partial-thickness (mucosal) flaps and either full-thickness (mucoperiosteal).

Schematic representation of the internal bevel incision to reflect a partial-thickness flap. Note that the incision ends on the root surface to preserve the periosteum on the bone.

Schematic representation of the internal bevel incision to reflect a full-thickness (mucoperiosteal) flap. Note that the incision ends on the bone to allow for the reflection of the entire flap.

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