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Diagnostic Value of Profile Photography in Identifying Departures From the Norm of Growth Pattern and Horizontal Jaw Relationship Publisher Pubmed



Sajjadi SH1 ; Elmi B2 ; Hajizade N2 ; Rakhshan V3, 4
Authors
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Authors Affiliations
  1. 1. Department of orthodontics, dental branch, Islamic Azad university, Tehran, Iran
  2. 2. Department of endodontics, dental school, Semnan, Iran
  3. 3. Research committee, Iranian tissue bank and research center, Tehran university of medical sciences, Tehran, Iran
  4. 4. Department of dental anatomy and morphology, dental branch, Islamic Azad university, Tehran, Iran

Source: International Orthodontics Published:2017


Abstract

Background Although the importance of facial photography in orthodontics has been recognized, there is only one study on its validity and absolutely no studies on its diagnostic value. This study was conducted, therefore, to evaluate for the first time the diagnostic merit of photography in detecting growth pattern and jaw relationships. Methods Standardized lateral cephalographs and profile photographs were taken from 54 girls and 26 boys. On cephalometry, growth pattern (normal, horizontal, and vertical) and horizontal bimaxillary classification (Classes I to III) were determined. Using photographs, the angles FH-MP’, CP’-MP’, Sn-T-Me’, cutaneous analog of ANB, facial convexity, and head position were calculated. Diagnostic photography-based measurements for detecting departures from the norm were calculated by counting correct and incorrect diagnoses, according to the gold standard (lateral cephalometry). Results The sensitivity, specificity and positive predictive values, and the negative predictive value of FH-MP’ photographic measurements in detecting growth disorders were 51.4, 77.8, 64.3, and 67.3 percent, respectively. These values were 45.7, 95.6, 88.9, and 69.4 percent for the CP’-MP’ measurement, and were 40.0, 93.3, 82.4, and 66.7 percent for Sn-T-Me’, and 51.4, 100, 100, and 72.6 percent for all of them combined. In detecting the horizontal relationship between the jaws, the photographic method showed an overall sensitivity, specificity, PPV, and NPV of 80.9, 63.6, 76.0, and 70.0 percent, respectively. These values were 80.9 57.6 73.1 67.9 percent for cutaneous analog of ANB, 87.2, 45.5, 69.5, and 71.4 percent for facial convexity, and 61.7, 66.7, 72.5, and 55.0 percent for head position. Conclusions Profile photography can be used as a perfectly accurate measurement tool for detecting horizontal and vertical growth patterns. It is also a rather accurate method for detecting the normal growth pattern, as well as both Class I and non-Class I jaw relationships. These results highlight this non-invasive and economic method as an effective clinical diagnostic tool. © 2017 CEO
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