Why the Repaired Midface Grows Backward
Anatomical domain · Lesson 15 of 20 · Human Body Systems (HBS)
Today's goal: Explain how a repaired cleft maxilla grows poorly forward, why palate scar adds a restraining effect, and how this produces a flat midface and a Class III (underbite) tendency.
What a finished product looks like
This is a model of the work you should turn in. Use it to check your own: match the structure and the level of detail, do not copy it. Your wording should be your own.
What I am watching: his midface for flatness (maxillary hypoplasia / midface retrusion) and his bite for a Class III, underbite pattern where his lower teeth close in front of his upper teeth.
Why the upper jaw sits back: two forces. The cleft maxilla tends to grow poorly forward on its own, and the scar from his palate repair tethers and restrains forward growth. A multicenter study even found a more scarring pushback repair was linked to more maxillary deficiency, while a gentler two-stage repair did less harm.
What it means: this is an expected growth tendency, not a sign the earlier lip and palate surgeries failed, and the team will plan to correct the bite and midface later, near the end of his growth.
How this was built, step by step
The finished product above did not appear all at once. Here is the path from the question to the turned-in work, so you can follow the same steps.
- 1Start from today's question: Why does a repaired grow poorly forward, and what does that do to the shape of Mateo's face and the way his teeth meet?
- 2Work the Model and the Explore questions to reason it out before writing anything.
- 3Pull the specific evidence the product needs from the reading and any database you used.
- 4Write it up in the required format: Write one line in Mateo's growth chart at age 12, in three short sentences a parent could read: name what you are watching for in his midface and bite using today's terms, explain in plain words why his upper jaw tends to sit back (name the two forces), and note that this is something the team will plan to correct later, not a sign the earlier surgeries failed.
- 5Check it against the rubric, then submit.
| 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 "Write one line in Mateo's growth chart at age 12, in three short sentences a parent could read: name what you are watching for in his midface and bite using today's terms, explain in plain words why his upper jaw tends to sit back (name the two forces), and note that this is something the team will plan to correct later, not a sign the earlier surgeries failed.".
- 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.
WebXam problem for today's skill
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.