The least accurate regions in vertical plane were subnasal and upper lip, and subnasal and pogonion in horizontal plane.
M. S. Ahmad Akhoundi, G Shirani, M Arshad, H Heidar, A Sodagar 2012, 'Comparison of an Imaging Software and Manual Prediction of Soft Tissue Changes afterOrthognathic Surgery', Journal of Dentistry of Tehran University of Medical Scienceshttp://jdt.tums.ac.ir/index.php/jdt/article/view/784/356. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
For humans, surface resorption commonly dominates on anteriorly-facing areas of the subnasal region of the maxilla and mandible during development.
Rodrigo S. Lacruz, José María Bermúdez de Castro, María Martinón-Torres, Paul O'Higgins,Michael L. Paine, Eudald Carbonell, Juan Luis Arsuaga, Timothy G. Bromage 2013, 'Facial Morphogenesis of the Earliest Europeans', PLoS ONE10.1371/journal.pone.0065199. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Frontal photographs were obtained and cropped from the subnasal to menton areas of subjects to standardize the size of pictures.
Aida Saffarpour, Maryam Ghavam, Anna Saffarpour, Rozita Dayani, Mohammad javad Kharazifard 2016, 'Perception of Laypeople and Dental Professionals of Smile Esthetics', Journal of Dentistry of Tehran University of Medical Scienceshttp://jdt.tums.ac.ir/index.php/jdt/article/view/885. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)