Retrognathic Profile: Chin, Jaw and Limits of Injectables

The retrognathic profile is one of the complaints where HOF most needs to know its own limit. The patient arrives saying they have a "chin that goes in" or a "double chin even though I'm thin," and the clinical question is a different one: is the setback only in the chin, or in the whole jaw? The answer separates a case for chin filler from one that calls for orthodontics or surgery.

This guide is about assessment and indication. It gives no volumes, plans or injection technique, which are decisions for the qualified professional, following the product's instructions for use and the rules of their professional council in Brazil.

Retrognathia, retrogenia or microgenia?

The terms get mixed up in searches, but they describe different situations:

In practice, the pictures overlap: some patients have mild retrognathia with associated retrogenia. In the classification used in orthodontics, a convex profile with a deficient jaw corresponds to facial pattern II.

Which clinical signs suggest retrognathia?

• Convex profile, with the lower third set back relative to the midface.
• Increased overjet: the upper incisors sit well ahead of the lower ones.
• Forced lip seal: to close the mouth at rest, the mentalis muscle contracts and the chin skin wrinkles (an "orange peel" look).
• Altered labiomental fold: deep when the lower lip is everted behind the upper incisors, or flattened in other arrangements.
• Open cervicomental angle, with a poorly defined chin and neck transition, which the patient often calls a double chin.
• Functional reports: snoring, diagnosed sleep apnea, mouth breathing, pain or clicking in the temporomandibular joint.

How do you assess the profile at the visit?

Profile assessment depends on a standardized photo and a stable reference. See standardized clinical photography and, for the general reading of the face, facial assessment by thirds.

1. Head position. Photograph the profile with the head in a natural position, gaze on the horizon, aligned with the Frankfurt plane. A head tilted down simulates retrogenia; tilted up, it hides it.
2. Lips at rest. Ask the patient to relax the lips, without forcing the seal. Also record with the lips closed, to see the mentalis contraction.
3. Teeth in occlusion. Observe the relationship between the incisors and, when possible, the molar relationship. If this is not your field, refer to someone who assesses occlusion.
4. Profile references. Compare the position of the lips and of the pogonion with lines used in the analysis, such as the Ricketts line and the Steiner S line, and observe the facial convexity angle.
5. Height of the lower third. A short chin calls for a different projection from one that is already long. Projecting an elongated lower third forward tends to worsen proportion.
6. Neck. Separate what is submental fat, laxity and lack of bony support. The double chin assessment helps with that separation.

When do injectables help and when do they not?

The reason for the limit is mechanical: the injectable adds volume over a support that stays in the same place. To compensate for a large setback, you would have to stack product in the chin, which increases the height of the lower third, stretches the tissues and changes how the face reads from the front. The result is usually a chin "stuck" out front, not a balanced profile.

The comparison between filler and surgery, in the patient's language, is in genioplasty or chin filler.

Which options go into the plan?

• Chin filler with hyaluronic acid of higher projection capacity, in mild to moderate cases. Details on the area in chin.
• Jawline, to define the border and the angle when lack of definition is part of the complaint. See jawline filler and hydroxyapatite in the jawline.
• Toxin in the mentalis, when hyperactivity of the muscle wrinkles the chin and shortens the apparent projection.
• Orthodontics, which can treat the occlusion and, in some cases, provide dental camouflage.
• Orthognathic surgery, which repositions the jaw when the discrepancy is skeletal.
• Bony genioplasty or chin implant, when the problem is the chin and the volume needed exceeds what is reasonable for an injectable.

In dentistry, this decision involves other specialties. The integration of HOF with the rest of dental treatment is in HOF integrated with dentistry.

Which risks should you consider in the chin?

The chin has structures that call for an anatomy review: the mental nerve, which emerges at the mental foramen, and arterial branches in the area, such as the inferior labial artery and the submental artery. The complications described include swelling, bruising, asymmetry, nodules, product migration, altered sensation and, rarely, vascular occlusion. See vascular danger zones of the face.

How do you explain it to the patient?

Documenting the referral and the patient's decision in the patient record protects both sides, especially when they choose the injectable even after being told the limit. If the patient declines the recommended assessment, a refusal form documents the guidance given.

And in Harmy?

Retrognathic profile assessment checklist

1. Retrognathia, retrogenia or microgenia differentiated and documented.
2. Occlusion observed or assessed by someone trained to do so.
3. Profile photos with the head in natural position, lips at rest and in seal.
4. Height of the lower third and cervicomental angle noted.
5. Snoring, apnea, mouth breathing and joint complaints asked about.
6. Orthodontic or maxillofacial referral made when indicated.
7. Expectations aligned: the injectable improves contour, it does not reposition bone.
8. Hyaluronidase available when the plan uses hyaluronic acid.