Welcome back to our clinical cephalometric breakdown series at ceph.dentalorb.com. In our previous post, we looked at growth direction using the Bjork-Jarabak method. Today, we are breaking down a highly sophisticated European system built entirely around individual anatomic harmony: the Segner / Hasund Analysis.

Developed by Dr. Aas Hasund and later refined by Dr. Jörn Segner, this analysis moved orthodontics away from strict, static population averages. Instead, it recognizes that a person's "normal" jaw position depends entirely on their other facial features. It uses a floating system of structural harmony to give you an incredibly personalized diagnostic reading.

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Part 5: The Philosophy of Segner / Hasund Floating Norms

Traditional analyses say that an SNA angle of 82° is always ideal. However, Segner and Hasund demonstrated that if a patient has a long or short cranial base, or a steep skull base angle, an SNA of 85° or 79° might actually be perfectly harmonized for *their* specific face.

The Segner / Hasund method evaluates the face across three comprehensive dimensions: Sagittal jaw relations, Vertical skeletal planes, and a detailed Soft-tissue profile assessment. This comprehensive approach gives clinicians an unmatched view of structural balance and soft-tissue harmony.

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📐 Core Parameters & Clinical Interpretations

When you complete the landmark plotting sequence on Dental Orb, the system immediately calculates your patient's specialized values across these clinical sectors:

I. Sagittal Relations & Wits Appraisal

• SNA & SNB Angles [Norms: 82° / 80°]: Evaluates the forward or backward positioning of the upper and lower jaws relative to the skull base line.
• ANB Angle [Norm: 2°]: Shows the structural difference between the upper and lower jaw bases, establishing whether the patient fits a Skeletal Class I, II, or III category.
• Wits Appraisal [Norm: 0 mm]: Projects Points A and B perpendicularly onto the occlusal plane. This acts as a vital double-check to ensure that a steep skull base angle isn't masking a severe jaw discrepancy.

II. Vertical Plane Intersections

• NSBa Angle [Norm: 130°]: Measures the shape of the cranial base. This angle dictates how forward or backward the jaw joints sit relative to the face.
• MP - SN Plane [Norm: 32°] & MP - Palatal Plane [Norm: 25°]: These intersecting angles determine whether the jaws are opening vertically (Hyperdivergent) or closing horizontally (Hypodivergent).
• N:ANS / Total Facial Height [Norm: 45%]: Tracks the vertical proportion of the upper face compared to the lower face to ensure ideal aesthetic balance.

III. Soft Tissue & Holdaway Aesthetics

• Nasolabial Angle [Norm: 102°]: The angle formed at the base of the nose and the upper lip. An acute angle indicates a protruding upper lip, while an obtuse angle shows a flat or receded profile.
• H-Angle (Holdaway) [Norm: 10°]: Measures the profile's soft-tissue harmony by comparing the line from the chin to the upper lip against the bony facial plane. Higher values indicate prominent, protrusive lips.

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💻 How to Run Segner / Hasund Analysis on Ceph.DentalOrb.com

Our secure, offline-first web tool processes these multi-step geometric calculations directly inside your browser:

1. Step 1: Upload and Select Module
   Open ceph.dentalorb.com, upload your digital lateral cephalometric X-ray, and choose Segner / Hasund Analysis from the dropdown menu.


2. Step 2: Millimeter Calibration
   Because this analysis relies heavily on linear millimeter values (like the Wits Appraisal), click 测量 Calibrate and trace your 10mm spatial reference line carefully.


3. Step 3: Map the Skeletal & Soft-Tissue Landmarks
   Click Rx Analyze. Follow the visual prompts in the top black overlay box to click your structural points. This sequence includes cranial references (S, N, Ba), jaw limits (A, B, ANS, PNS, Go, Me, Pog), dental points, and crucial soft-tissue parameters (Nose tip, Subnasale, Lips, and Soft Chin).


4. Step 4: Generate Your Harmony Report
   As soon as the final soft-tissue point is clicked, the tool instantly displays your comprehensive diagnostic report in the sidebar. Variations outside normal ranges are automatically highlighted in red to guide your treatment planning. Click Print to save or compile a clean PDF chart.

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In Part 6 of our guide, we will step into advanced treatment planning and surgical predictability with the classic **Ricketts Bioprogressive Analysis**! If you have any questions, let us know in the comments below.