The Clinical Challenge: Eliminating Uncertainty in PET

Traditional tooth extraction triggers a rapid, irreversible resorptive cycle that can claim up to 56% of horizontal ridge width within the first four months. While standard Partial Extraction Therapy (PET) was introduced to combat this, early iterations were often criticized for being overly technique-sensitive and prone to complications like shield exposure or displacement. Clinicians required a standardized, step-by-step framework to ensure that the biological benefits of the socket shield—namely, the preservation of the buccal bundle bone—could be achieved with high-level reproducibility.

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Key Methodology & Insights (The SPOT Protocol)

The SPOT protocol streamlines the socket-shield procedure into a series of precise, measurable steps designed to maximize tissue stability and minimize complications:

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• Standardized Sectioning: The root is sectioned mesiodistally to retain only the facial fragment, which must remain firmly attached to the bundle bone via a healthy periodontal ligament (PDL).
• The 1.5mm Rule: To ensure resistance to fracture and resorption while providing adequate restorative space, the shield is thinned to a thickness of exactly 1.5–2.0 mm.
• Concave Shaping: The internal aspect of the shield is prepared with a concave profile and a coronal bevel (internal chamfer) to facilitate an ideal emergence profile for the final restoration.
• Coronal Reduction: Depending on the specific case, the shield is reduced to the level of the bone crest or 1 mm supracrestally to provide a scaffold for supracrestal gingival fibers.
• Horizontal Jumping Distance: An intentional gap is maintained between the implant threads and the retained root fragment to allow for a stable blood clot and to avoid dislodging the shield during implant insertion
• Prosthetic Integration: Utilizing an "S-shaped" emergence profile on the provisional restoration is essential to protect the shield and maximize soft-tissue infill.

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"Retention of a buccal shield of root structure, comprising dentin, cementum, PDL, and bundle bone, leads to an increase in the stability of the hard and, thus, soft tissues without increased incidence of implant infection."

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From Research to Practice

The SPOT protocol moves PET from a "heroic" procedure to a standard clinical workflow. Longitudinal data confirms that following these standardized steps results in significantly higher Pink Esthetic Scores (PES) and less midfacial mucosal recession compared to conventional immediate protocols. This meticulous approach is a core curriculum component of the MAXI Hybrid course, where we bridge the gap between biological theory and surgical mastery.

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Expert Tip: To achieve the highest level of reproducibility and safety, utilize guided surgery for both the initial root preparation and the implant placement. Guided templates ensure that the horizontal "jumping distance" is strictly maintained, preventing the implant threads from making physical contact with the shield—a critical factor in avoiding shield displacement and ensuring true biological integration.