The Pin Guide
Does not seat fully on teeth
Seat using indicator and adjust until all the windows on the Pin Guide are in contact with the teeth. Caution, due to tooth undercut, not all of the window needs to be seated, just the occlusal/incisal. View how the Pin Guide seats on the model. This should be repeated intraorally.
Are teeth mobile?
If so, they may need to be manipulated into the Pin Guide similar to how they were impressed.
Patient had dental work since initial impressions
Modify the Pin Guide or extract teeth that do not impact the seating of the Pin Guide.
Are there teeth to be removed?
Refer to the notes! We make notes on extractions. Remove the specific teeth noted on the GSI form, due to mal-occlusion or draw.
When is too much adjustment too much?
If aggressive adjusting clearly changes the fit and seating accuracy of the Pin Guide, this may be cause enough to stop the surgery and capture new records to start over.
Appliance is contacting the vestibular tissue and will not seat?
Flap the tissue until the Pin Guide seats. In other words, flap earlier on this arch. This is due to the initial impression not capturing the full vestibule, or the bone reduction is beyond the vestibule. Once seated, inspect and adjust if needed.
CHROME Loc Loop is broken
Must use manual clamping (fingers) to hold the Pin Guide and Fixation Base together. Pin Guide and Fixation base insertion accuracy is vital to the success of the case. The surgery could also be put on hold for a new Pin Guide to be ordered. The case should be returned to us to ensure accurate assembly.
What to look for when inspecting?
Does it fit into the Fixation base passively? Do the CHROME Loc plungers easily and almost passively insert? If not, there could be material inside the CHROME Loc box preventing. This could also mean that someone heat cleaned the guide. Use a narrow bur and open the hold on the Pin Guide CHROME Loc loop until the plunger seats.
What if it does not seat after an adjustment?
This probably means the model is not accurate, or perhaps the Pin Guide is fabricated with errors. The case must start with a fully seated Pin Guide. The case may have to be delayed. This is a clinical call based on how far off.
What if the CHROME Loc plunger pin pulled out?
The pin can be re-seated. It will not function as the others. It will pull out every time, so please use care when pulling so as not to drop in the mouth. The plunger will still work.
What if the Pin Guide loops are broken?
Must use manual clamping (fingers) to hold the Pin Guide and Fixation Base together. Pin Guide and Fixation base insertion accuracy is vital to the success of the case. The surgery could also be put on hold for a new Pin Guide to be ordered. The case should be returned for us to ensure accurate assembly.
Edentulous flap first? Seat drill and then Flap? What is our protocol?
The protocol is to not flap first. Seat the Pin Guide, drill all the sites, remove the Pin Guide, flap and re-seat and insert pins. The flap can be made first. If so, carefully follow the instructions that are provided with each case. This is a ridge incision first, top of ridge flapped forward. Must use care with swelling from anesthesia. Must ensure the Pin Guide is very accurately seating even though there is no labial support.
Edentulous Pin Guide seating? How to adjust?
Just like a denture, using indicator and finding the perfect seat. Be sure to account for swelling from inflammation from the anesthesia. Hold FIRM using two people or more, solid, consistent pressure. Do not use a surgical mallet until all the pins have been pushed in as far as they will go with finger pressure. Using a surgical mallet too early can put uneven pressure on the assembly of Pin Guide and Fixation Base.
All or most of the teeth are mobile?
This is critical. If the Pin Guide moves the teeth, the implants will be in the wrong position. Let us know early in the planning. We will fabricate a Pin Guide with opposing bite integrated. The patient will be closed biting on the Pin Guide while the facial pins are being seated. If there is no bite designed in the Pin Guide, use the palate for stability, or on lowers try to use the tissue.
Edentulous Pin Guide used to verify vertical
If the Pin Guide is a replica of the denture, seat the Pin Guide and mark the nose and chin to verify final prosthetic accuracy. If this is a double arch, the Pin Guide will probably have a bite integrated, so the vertical is not centric and this technique cannot be used.
Double Edentulous protocol?
- Complete upper full surgery and prosthetic conversion and then lower arch. The mandibular Pin Guide has a bite that is designed for the maxillary temporary prosthetic. In other words, when the max is finished, use the max teeth to ensure proper seating of the mandibular Pin Guide.
- Seat both Pin Guides initially and drill all the max and man sites. Complete the max case, then flap the mandibular and the holes are already there for the pins. Both methods are acceptable. Follow the instructions included with each case for the flapping technique.