The Clinical Challenge: Horizontal Atrophy in the "Danger Zone"

Reconstructing a severely narrow mandibular ridge often requires harvesting bone from the ramus or symphysis, adding surgical complexity and patient morbidity. Furthermore, large horizontal augmentations traditionally require aggressive periosteal releasing incisions and coronal flap advancement to achieve primary closure. In the anterior mandible, this leads to the displacement of the mucogingival junction, loss of vestibular depth, and a high risk of wound dehiscence due to tissue tension.

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Key Methodology & Insights (The Relocation Protocol)

The technique transforms the liability of a knife-edge ridge into a surgical asset by relocating the crestal bone:

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• In-Situ Shell Harvesting: The coronal segment of the knife-edge ridge is sectioned and used as the bone shell, meaning the donor and recipient sites are identical.
• No Separate Donor Site: This eliminates complications associated with the external oblique ridge or mandibular symphysis harvests.
• Predictable Bone Gain: The study reported an average horizontal gain of 3.6 ± 0.76 mm at 1 mm below the new crest and 3.4 ± 0.92 mm at 5 mm below.
• Tension-Free Closure: Because the "shell" is created from the existing ridge height, the soft tissue naturally covers the site without the need for periosteal releasing incisions or aggressive flap advancement.
• Anatomical Preservation: This protocol minimizes the risk of wound dehiscence and preserves the natural vestibular depth and mucogingival architecture.
• Staged Success: Follow-up data at 1–4 years confirmed sufficient bone volume for stable implant placement in all patients.

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"The advantages of the relocated crestal ridge segment utilization are as follows: the donor and recipient sites are the same, no major anatomical structures are compromised, and the risk of wound dehiscence is minimized."

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From Research to Practice

The Relocated Crestal Ridge Segment technique represents a "Biology-First" approach to the atrophic mandible. It proves that we can achieve significant horizontal ridge augmentation—up to 4 mm—while maintaining perfect soft tissue harmony. The difficulty is relatively low, as the crestal segment adapts almost like a tailored graft. This technique is a highlight of the MAXI Hybrid course, where we teach clinicians how to move beyond traditional block grafting to more elegant, less invasive autologous solutions that respect the patient's natural anatomy.

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Expert Tip: This technique is specifically indicated for cases with severe horizontal atrophy but adequate ridge height. Harvest autogenous bone chips by thinning out the crestal
ridge segment. Use 4-6 screws to stabilize the bone shell.