Case of the Month: When Non-Surgical Therapy Falls Short: Understanding the Need for Regenerative Surgery

DENTAL EDUCATION:

This case illustrates how predictable bone regeneration was achieved through a papilla preservation technique combined with biomaterials (Emdogain and Bio-Oss®). Understanding these principles will help you better assess periodontal stability, improve patient communication, and make more informed treatment decisions in your daily practice.

Patient Profile:

• Age/Gender: 52-year-old female
• Medical History: No relevant medical history
• Reason for Referral: Generalised periodontitis

Diagnosis:

• Generalised periodontitis, Stage III, Grade C

Initial Treatment Approach:

• The patient underwent two sessions of non-surgical therapy (NST).
• While improvement was observed, residual pockets persisted on a few teeth.
• For this case discussion, we will focus on tooth LR4.

Initial Clinical Findings for LR4:

• Initial Probing Depths: 10mm (mesial and lingual aspects)
• Post-NST Probing Depth: 9mm

Radiographic Findings: A vertical, contained defect was noted

Why Non-Surgical Therapy Alone Was Insufficient:

Despite completing two sessions of NST, this patient’s periodontal condition at LR4 demonstrated minimal improvement, with only a 1mm reduction in pocket depth. This case underscores the limitations of non-surgical therapy, particularly in patients with deep vertical bone defects. Literature suggests that approximately 30% of periodontitis cases require additional surgical intervention to achieve optimal periodontal stability.

Key Limitations of NST in This Case: 

1. Limited Effect on Deep Vertical Defects:
   • NST primarily removes plaque and calculus but does not regenerate lost bone.
   • In deep, contained vertical defects, removing bacteria alone is insufficient for regeneration.
2. Residual Pocket Depths and Disease Progression:
   • • Even after NST, persistent deep pockets (≥6mm) remain a risk factor for continued breakdown.
     • Residual pathogens can lead to recurrent inflammation and attachment loss.
3. Need for Surgical Access for Regeneration:
   • • • Deep defects require biomaterial placement (e.g., Emdogain, Bio-Oss®) to stimulate tissue and bone regeneration.
       • Surgery ensures better defect access, root surface decontamination, and precise biomaterial application.

Treatment Plan:

• A regenerative surgical approach using the papilla preservation technique as per Cortellini et al. (1999).
• Use of biomaterials for regeneration:
  • Enamel Matrix Derivative (Emdogain)
  • Bone Substitute Material (Bio-Oss®)

Follow-Up and Outcome:

• Post-Surgical Review (3-6 months):
  • Radiographs show a filled defect.
  • Probing depth reduced to 3mm.

Periodontal status is now stable

Conclusion:

This case demonstrates the limitations of NST in cases with significant vertical bone defects. It reinforces the importance of a combined regenerative approach using appropriate surgical techniques and biomaterials to achieve predictable periodontal stability.

Reference:
Cortellini P, Prato GP, Tonetti MS. The simplified papilla preservation flap. A novel surgical approach for the management of soft tissues in regenerative procedures. Int J Periodontics Restorative Dent. 1999 Dec;19(6):589-99. PMID: 10815597.

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