Filling the Bony Gap in the Gum Ridge
How and when do we fill the bony gap in Mateo's gum ridge so a tooth has a home, and what does the timing have to do with success?
💡 An alveolar bone graft moves living into the , and timing it before the canine erupts and before age 9 is what makes it take.
Prerequisite check
- The upper front teeth sit in the in order: central incisor, , canine; the line runs right where the lateral incisor should form.
- Missing teeth () occurred in about 50 percent of one population overall, and the rate rose with cleft extent.
What you will learn
Goal: Explain why, when, and how an alveolar bone graft fills the in the gum ridge, and use real outcome data to defend grafting before age 9.
- An packs spongy , classically from the , into the cleaned-out bony gap so the arch becomes continuous.
- It is a secondary procedure done in the , timed to the canine that is about to erupt.
- In a 3D cone-beam CT study, overall was 86.2 percent, and the single biggest predictor of failure was age over 9 years at the operation.
- The graft rebuilds the gum-ridge bone but does not fix how the whole upper jaw grows; that is a separate problem.
Model: What the graft is, and real outcome data on timing
A like Mateo's leaves a notch of missing bone in the gum ridge, between the front teeth and the canine on the side. The standard fix is a secondary alveolar bone graft: the surgeon harvests spongy , classically from the (the rim of the hip bone), and packs it into the cleaned-out bony gap. Over months that transplanted bone knits into a continuous arch. The graft does four jobs: it makes the arch continuous again, it gives the canine bone to erupt into, it supports the base of the nostril on the cleft side, and it closes any small leftover oronasal opening in the gum. It is called secondary because it follows the lip and repairs, done during the (both baby and adult teeth present), timed to the canine.
A 3D cone-beam CT study measured how well grafts took. Overall was 86.2 percent. The single biggest predictor of graft failure was age over 9 years at the operation, so the authors recommended grafting before age 9. A separate of the early-versus-late debate found that most studies favor early secondary grafting (roughly ages 4 to 7, before the erupts) over late grafting, though the evidence is not yet definitive.
One honest caution: a study of later jaw surgery found the timing of the alveolar graft did not significantly change whether a patient later needed a Le Fort I maxillary advancement. The graft rebuilds the gum-ridge bone, but it is not a cure for how the whole upper jaw grows.
Explore (work the model before reading on)
- Name the bone the surgeon usually harvests and the part of the body it comes from.
- What was the overall rate, and what was the single biggest predictor of a graft failing?
- The graft gives the canine bone to erupt into, and grafting should happen before age 9. Why want the bone in place before the canine is ready, rather than after?
- One study recommends before age 9 and another favors ages 4 to 7. Are these in conflict, or do they point the same direction?
- Predict: if Mateo's graft is delayed past age 9, what does the data say is likely to happen, and name one tooth problem that could follow.
Guided notes
What the graft is
- The spongy inner bone used because it heals and remodels well is ____ bone.
- The graft is a secondary procedure done in the ____ , before the canine erupts.
Timing and success
- Overall was about ____ percent (86), and the biggest predictor of failure was age ____ (over 9) years.
- A review found most studies favor ____ (early) secondary grafting, about ages 4 to 7, though the evidence is not yet definitive.
What it does not fix
- The graft rebuilds the gum-ridge bone but did ____ (not) significantly change whether a patient later needed maxillary advancement.
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Vocabulary (the same words your classes use)
Vetted readings for this lesson
- Kimia et al. 2022, Predictors of Alveolar Bone Graft Outcome by 3D Cone-Beam CT (Plast Reconstr Surg)
- Fahradyan et al. 2019, Optimal Timing of Secondary Alveolar Bone Grafting: A Review (J Oral Maxillofac Surg)
- Powell et al. 2022, Does Early Secondary ABG Influence Need for Maxillary Advancement (Cleft Palate Craniofac J)
Track your progress today
Check these off as you work through the lesson, then submit. This tells Mr. Mendoza how you're doing so he can help the class. It does not replace turning in your producible.
Use the code Mr. Mendoza gave you, not your name. Saved on this device.
- Read the Model and answered the Explore questions.
- Filled in the guided notes in my own words.
- Defined the new vocabulary with an example.
- Built the producible: Recommend Mateo's graft at the team meeting. In three or four sentences a parent could follow: state the age window you would graft him and cite the data behind that timing, name one specific job the graft does for his teeth, and explain in one sentence why waiting too long is a real risk, using the age-9 finding.
- Wrote my Claim, Evidence, and Reasoning exit ticket.
Exit ticket (Claim, Evidence, Reasoning)
- Claim: Mateo's alveolar bone graft should be done before age 9.
- Evidence: Cite the overall success rate and the age finding from the data.
- Reasoning: Explain why earlier grafting protects both the graft and a tooth that needs to erupt.
| Criterion | Proficient | Developing | Beginning |
|---|---|---|---|
| Complete | Every required part of the artifact is present and filled in. | Most parts are present, but one is missing or left blank. | Several parts are missing. |
| Accurate | The science and data are correct and match the evidence. | Mostly correct, with a small factual slip. | Key science or data is wrong. |
| Scientific reasoning (CER) | States a claim, backs it with specific evidence, and explains the reasoning. | Has a claim and evidence, but the reasoning is thin or missing. | Gives an answer with no evidence or reasoning. |
| Professional communication | Clear, organized, and labeled the way a clinician or scientist would write it. | Readable but disorganized or missing labels. | Hard to follow. |
| Submitted | Turned in the right way (Schoology for routine work) and confirmed. | Turned in, but in the wrong place or unconfirmed. | Not turned in. |
- CompleteProficient: Nothing is left blank: the model fills every part of "Recommend Mateo's graft at the team meeting. In three or four sentences a parent could follow: state the age window you would graft him and cite the data behind that timing, name one specific job the graft does for his teeth, and explain in one sentence why waiting too long is a real risk, using the age-9 finding.".
- AccurateProficient: Every number and claim matches the case evidence.
- Scientific reasoning (CER)Proficient: It names a claim, cites the specific evidence, and explains the reasoning, not just the answer.
- Professional communicationProficient: It is organized and labeled like a real chart note.
- SubmittedProficient: It would be turned in on Schoology and confirmed.
Where this leads: careers
What's next: We rebuilt the bone of Mateo's gum ridge and gave his canine a home. But the graft reminded us of something bigger: its timing did not change whether he might need later jaw surgery, because the whole upper jaw it sits on has been growing poorly all along. How does a repaired change facial growth, and what does that do to his bite? We chase that next time.