Maxillary Mandibular Plane Angle (MMPA): Ideally 27 degrees +-4 – Orthodontics Mnemonics

By Hiba Al-Shawa / April 7, 2022

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Frankfort Horizontal Plane: a Line connecting Porion with Orbitale

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Herbst Appliance

General Orthodontics Mnemonics
- M-D width of permanent maxillary and mandibular teeth
- Primate Spaces are Most Noticeable between Primary Maxillary Lateral Incisors and Canines, Mandibular Canines and First Molars.
- Ectopic Eruption
Pubertal Growth Spurt and Hand-Wrist Radiograph
- Hand-Wrist Radiograph is Used to Predict the Time of Pubertal Growth Spurt
- Ulnar Sesamoid or Hamate Bones are Landmarks Used to Predict the Time of Pubertal Growth Spurt
Malocclusion
- Mnemonic: Class 2 Division 1 vs. Division 2 (+Types A, B, & C)
- In Class I Malocclusion: Space Deficiency of more than 4mm indicates extraction
- Malocclusion is more common in heterogenous populations, less common in homogenous populations
- Posterior Crossbites and Mild Anterior Crossbites Should Be Corrected in the First Stage of Treatment, while Sever Anterior Crossbites are Usually Not Corrected Until The Second Stage of Treatment.
Cephalometric Analysis Mnemonics
- Steiner’s Analysis: SNA Angle: Ideally 82 degrees
- Steiner’s Analysis: SNB Angle: Ideally 80 degrees
- Frankfort Horizontal Plane: a Line connecting Porion with Orbitale
- Maxillary Mandibular Plane Angle (MMPA): Ideally 27 degrees +-4 – Orthodontics Mnemonics
Orthodontic Appliances
- Herbst Appliance
- Nance Appliance (Space Maintainer)
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