The Clinical Challenge: Identifying and Resolving Shield Exposure

Internal shield exposure occurs when the retained root fragment penetrates the overlying sulcular mucosa, often resulting in localized inflammation or the visible appearance of the shield within the peri-implant sulcus. This complication is primarily driven by two factors: a high crestal shield height (remaining above the bone level) and a lack of adequate space between the shield and the implant or prosthetic components. If left unmanaged, the exposure can become a site of infection for the underlying peri-implant tissues.

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Key Methodology & Insights

The study analyzed the successful management of 12 internal shield exposures across 10 patients, establishing a clear three-step resolution protocol:

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• Surgical Reduction: Upon diagnosis, the shield is reduced to the bone level using a round diamond bur, ensuring it sits at least 1.5 mm below the inner mucosal surface to allow for tissue coverage.
• Connective Tissue Grafting (CTG): To ensure complete and stable coverage, a thin (1–1.5 mm) CTG is harvested from the palate or tuberosity and secured over the reduced shield.
• Prosthetic Decompression: The subcritical contour of the restoration is reduced to create a minimum of 1.5–2 mm of space for healthy soft tissue growth between the shield and the prosthetic surface.
• Clinical Success: The protocol achieved 100% resolution of exposures and inflammation in all cases, with stable or improved Pink Esthetic Scores (PES) at follow-ups ranging from 1 to 5 years.
• Digital Accuracy: Successful outcomes depend on correct 3D implant positioning, which is best achieved through static or dynamic computer-guided systems to avoid shield contact.

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"The proposed treatment protocol—including shield reduction, a connective tissue graft, and prosthetic adjustments—completely covered the exposure and restored gingival health."

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From Research to Practice

This multicenter series demonstrates that internal shield exposure is a manageable complication that does not have to result in aesthetic failure. By shifting the shield reduction from a surface-level "shaving" to an internal in-toto excision of the problem area, clinicians can predictably restore the soft tissue seal. These "Troubleshooting" workflows are essential components of high-level surgical training, equipping clinicians with the confidence to handle technical setbacks with biological precision.

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Expert Tip: Prevention starts during the initial PET surgery. Always prepare a 2 mm internal chamfer on the coronal edge of the shield and ensure the fragment is reduced precisely to the level of the bone crest. This proactively creates the biological space required for a healthy soft tissue seal and prevents the prosthetic "pressure" that typically triggers internal exposure.