The Clinical Challenge: Maintaining the Inter-Implant Scallop

Replacing adjacent central and lateral incisors with dental implants is notoriously difficult due to the inevitable flattening of the inter-proximal bony scallop and subsequent papillary atrophy. On average, the inter-implant soft tissue height measures only 3.4 mm, and the lack of supracrestal fiber attachment around implants—combined with the loss of the PDL blood supply—makes complete embrasure fill nearly impossible to achieve predictably with conventional extraction protocols.

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Key Methodology & Insights

The study evaluated six patients receiving unilateral adjacent implants in the central-lateral incisor area, utilizing specific socket-shield designs based on individual socket dimensions and root health:

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• Shield Configurations: The study employed standard line-angle-to-line-angle shields as well as C-shaped and L-shaped extensions to support inter-proximal hard and soft tissue.
• Dimensional Benchmarks: Shields were reduced to the bone level with a thickness of approximately 1.5 mm (reduced to 1 mm for narrow lateral incisor sockets) and a length of 8 mm to ensure long-term stability.
• Prosthetic Space: A coronal chamfer was prepared on the shield to provide adequate restorative space and prevent mechanical interference.
• Implant Positioning: Platforms were positioned 1.5 mm below the shield's midfacial level to facilitate a natural emergence profile.
• Vascular Preservation: The primary driver of success was the retention of the PDL blood vessels, which continue to nourish the bundle bone and support the supracrestal soft tissue complex between the two implants.
• Mid-Term Stability: At the 3–5 year follow-up, all cases showed stable papilla height comparable to the contralateral natural dentition, regardless of whether implants were placed immediately or delayed.

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"The socket-shield technique demonstrated favorable outcomes in preserving the papilla between adjacent upper central-lateral incisor implants in the midterm follow-up... preserving the integrity of the papilla between implants placed in the esthetic zone."

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From Research to Practice

This case series highlights the versatility of Partial Extraction Therapy (PET) in managing complex adjacent-implant scenarios. The data suggests that by preserving the patient’s own biological architecture, clinicians can bypass the limitations of traditional grafting and achieve a "seamless" aesthetic transition. These configurations and precision-shaping protocols are central to the refined techniques taught in the MAXI Hybrid curriculum.

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Expert Tip: In cases involving periapical lesions, the socket-shield technique remains a viable option provided the root fragment’s stability is not compromised. When debriding these sites, utilize an esthetic buccal flap rather than marginal gingival elevation. Avoiding the elevation of the marginal gingiva is vital to prevent the secondary bone resorption that often triggers the very papillary collapse you are trying to avoid.