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True vertical line (TVL) and AB-MP have been used for surgical planning. Which one is more preferable for reference plane and why?
True vertical line (TVL) and AB-MP have been used for surgical planning. Which one is more preferable for reference plane and why?
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From Dr. Sug-joon Ahn :
TVL is a vertical reference plane at natural head position. After a horizontal reference plane is made using the vertical reference plane (for example, a plane pass by Sella and perpendicular to TVL), antero-posterior dental and skeletal relationships are determined (Please refer to the journal; Arnett GW, Bergman RT. Facial keys to orthodontic diagnosis and treatment planning. Part 1. Am J Orthod Dentofacial Orthop 1993;103:299-312). However, a possibility to change the TVL after an orthognathic surgery, I do not like to use the TVL as the reference plane.
AB to mandibular plane angle is used to determine if a patient need surgical orthodontic treatment after the end of growth. If a Korean patient with a class III malocclusion has AB to mandibular plane less than 60 degrees, the patient will have a high possibility to undergo a surgical orthodontic treatment.