Periodontal disease that extends to the supporting structures is generally considered to be:

Study for the Pediatric Dentistry II Exam. Utilize flashcards and multiple choice questions with hints and explanations. Prepare thoroughly for your exam!

When periodontal disease reaches the supporting structures, the destruction involves connective tissue attachment and alveolar bone. That loss is permanent in terms of what has happened to the attachment level, so the condition is described as irreversible. Gingivitis, by contrast, affects only the gingiva without attachment loss and is therefore reversible with proper plaque control and treatment. While some regenerative procedures can recreate bone or periodontal ligament to an extent, the original attachment cannot be fully restored in all cases, so the general characterization remains irreversible. The other terms don’t fit because they imply complete or repairable restoration that isn’t guaranteed for attachment loss.