The Periodontal Decision: Prognosis, Occlusion & Peri-Implant MCQ

The final periodontal question is whether a compromised tooth can be predictably kept, and how it interacts with occlusion, systemic disease, restorations, and implants. This is where the Structural Decision Framework (SDF) earns its place, reading the periodontium through Structure, Force, Time, and Stability. The recurring themes are concrete: prognosis weighs the structural reserve (attachment, bone, furcation, mobility) against the load and the risk; occlusal trauma does not cause periodontitis but can accelerate loss in an inflamed periodontium; periodontal health must precede restorative work; and the implant has its own diseases, peri-implant mucositis and peri-implantitis, that follow the same biofilm-and-host logic as periodontitis. Implant placement itself belongs to prosthodontics and oral surgery; periodontics owns the decision and the management of peri-implant disease.

Periodontal Prognosis

• Prognosis weighs the structural reserve (remaining attachment and bone, furcation involvement, mobility, and the crown-to-root ratio) against the disease activity and the patient's risk factors.
• Prognosis is described on a spectrum from good through fair, poor, and questionable to hopeless; a hopeless tooth has inadequate remaining attachment, severe mobility, or a through-and-through furcation that cannot be maintained.
• An unfavorable crown-to-root ratio (as bone is lost, the lever arm above the bone lengthens relative to the supported root) worsens prognosis and the tooth's ability to bear load.
• The single most important long-term prognostic factor is the patient's plaque control and adherence, modified by systemic risk such as smoking and diabetes.

The Maintain-versus-Extract Decision

• A periodontally involved but restorable tooth with a reasonable prognosis is generally maintained, because a reduced but stable periodontium can function for years.
• Extraction is favored when a tooth is hopeless (inadequate attachment, unmanageable furcation, excessive mobility) or when its poor prognosis jeopardizes adjacent teeth or a planned restoration.
• The decision weighs the prognosis, the strategic value of the tooth, the restorative plan, the patient's risk and wishes, and the cost and prognosis of alternatives honestly.
• Replacing an extracted tooth with an implant or bridge is a prosthodontic decision; the periodontal task is to judge whether the natural tooth can be predictably kept.

Occlusal Trauma

• Primary occlusal trauma is injury from excessive occlusal force on a tooth with a normal, intact periodontium; secondary occlusal trauma is injury from normal or excessive force on a periodontium already reduced by disease.
• Occlusal trauma by itself does not cause or initiate periodontitis (plaque does), but in the presence of inflammation it can be a co-destructive factor that accelerates attachment loss.
• Clinical and radiographic signs include increased tooth mobility, fremitus (movement felt on function), widening of the periodontal ligament space, and tooth migration.
• Management is to control the inflammation first and address the occlusion: occlusal adjustment, an occlusal guard for parafunction, and splinting of mobile teeth where indicated.

Perio-Systemic and Perio-Restorative Interfaces

• Systemic conditions modify the decision: poorly controlled diabetes and smoking worsen prognosis and the response to therapy, and the diabetes relationship is bidirectional.
• The perio-restorative interface requires that restorative margins respect the supracrestal attachment, and that periodontal health is established before definitive restorative or prosthetic work.
• Restoring on an inflamed or unstable periodontium leads to inaccurate margins, continued inflammation, and failure, so periodontal therapy precedes the final restoration.
• Furcation involvement, mobility, and inadequate keratinized tissue at a planned abutment all influence whether and how the tooth can carry a restoration.

Peri-Implant Disease

• Peri-implant mucositis is reversible inflammation of the soft tissue around an implant without bone loss, the implant analogue of gingivitis.
• Peri-implantitis is inflammation around an implant with progressive bone loss, the implant analogue of periodontitis, and it is generally harder to treat than periodontitis around a tooth.
• Risk factors include a history of periodontitis, smoking, poor plaque control and lack of maintenance, and residual cement; implants therefore require their own supportive maintenance.
• Management ranges from biofilm removal and decontamination for mucositis to surgical access, decontamination, and sometimes regeneration for peri-implantitis; implant placement itself is a prosthodontic and oral surgery procedure.

Reading the Decision Through the SDF Lenses

• Structure: the remaining attachment and alveolar bone, the periodontal biotype, furcation involvement, and the defect morphology.
• Force: occlusal trauma on a weakened periodontium, the biofilm load, and the biomechanical stress from parafunction.
• Time: whether the disease is active or in maintenance, the healing trajectory after therapy, and the recurrence risk that defines long-term success.
• Stability: whether attachment levels will hold, integrating biofilm control, occlusal management, systemic risk factors, and patient adherence.