Correcting the Bite and the Midface
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 3
Mateo's records at age 15 show a recognizable pattern in repaired complete cleft lip and palate. His lower jaw sits in front of his upper jaw when his teeth touch, so his lower front teeth close ahead of the upper ones (an underbite). His midface, the region under the eyes and around the upper lip, looks flat and set back. Orthodontic notes call this a Class III relationship. The cause is the one the team already knows: the cleft maxilla grows poorly forward, and palate scar adds a restraining effect, together producing a flat, retruded midface. Children who screened positive for sleep-disordered breathing were more likely to have this Class III, maxilla-set-back pattern, so the bite problem and the airway problem share a root.
Piece 2 of 3
Surgeons have two main moves once growth is nearly done. A Le Fort I osteotomy with advancement: the surgeon makes a planned cut across the maxilla above the tooth roots, frees the whole upper-jaw block, slides it forward to a new position, and fixes it there with small plates and screws. This is the classic correction for midface retrusion in cleft patients. Distraction osteogenesis: instead of moving the whole block at once, the surgeon makes the cut and then slowly separates the two bone ends a fraction of a millimeter per day using a device; new bone forms in the widening gap. This is used when the jaw must move a long way forward, where a single slide would be too large to heal well.
Piece 3 of 3
These corrections wait until skeletal maturity in the teen years, because moving a jaw that is still growing would relapse. The orthodontist aligns and levels the teeth first so the new jaw position produces a working bite.
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.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.