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What does it mean if my Fixation Base contacts bone or feels unstable?

Because the Fixation Base is designed to float labial to the bone, any bone contact or wobble points to a seating, anatomy, or bone-density issue. Diagnose first, then choose a corrective option. Inspect against the GSI report images, which show how the metal should relate to the alveolar bone.

Finding Likely meaning Options
Contacts bone in the posterior Missed exostosis, or the lab trimmed the model and missed it Inspect; flap and adjust the bone, or carefully adjust the metal with a disc — never cut off a CHROME Loc or pin site.
Contacts labial bone Pin Guide seated crooked, or soft bone let the malleting push the base and oblong the holes Pull the Fixation Base back out to mimic the GSI report images, pack gauze plugs between the base and bone, and be gentle. As a last resort, use the base for bone reduction only and freehand the implants using the Carrier Guide for approximate location. (These are salvage suggestions for a misaligned case, not surgical recommendations — they can lead to unpredictable results.)
Base wobbles / is unstable Pins not fully seated, or very low bone density If pins aren't all in yet: don't drill to depth — drill ½ into the bone and mallet the pins home. If all pins are already in and it's still loose, wedge a cotton plug between the bone and base to force the metal away from the bone, mimicking the GSI report image.
Pin Guide seated crooked with teeth still present Crooked delivery of the base Remove the Fixation Base and re-insert it with the Pin Guide fully seated.
Mobile teeth shifted during seating The Pin Guide moved the teeth If the Pin Guide has an integrated bite, restart using that bite to seat. Going forward, tell the CHROME team about mobile teeth so the guide can be designed to seat against the opposing teeth.

About the Fixation Base: The Fixation Base is made of cobalt-chromium (CoCr), a metal roughly 20× stronger than surgical resin. It is delivered to the site by the Pin Guide and uses patented floating technology, which means it is supported entirely by divergent pins and never contacts bone. It serves two roles. First, it supports the stackable guides that follow. Second, it acts as the bone-reduction reference, since bone is reduced to the level of its coronal flat edge. 

 

Additional Resources

For more information concerning CHROME GuidedSMILE:

 

Contact Information

For help with a digital denture solution for your next case, contact ROE Dental Laboratory: