Maxillary Sagittal Position in Relation to the Forehead: A Target for Orthognathic Surgery

The relationship of the maxillary incisor to forehead position and angulation may be a predictor for the esthetic antero-posterior maxillary position in orthognathic surgery, but this has not been fully explored in the existing literature. Additionally, this analysis requires a lateral smiling photograph, which is not typically included in orthodontic/orthognathic records. This is a bidirectional study of Caucasian orthodontic patients with malocclusions correctable with nonsurgical and nonextraction treatment. Subjects for Group 1 were enrolled prospectively and records included a lateral smiling photograph. Group 2 patients were collected retrospectively with standard records. The analysis described in Andrews' Element II of The Six Elements of Orofacial Harmony was applied to the smiling photographs for Group 1, resulting in "Incisor- goal anterior limit line (GALL)" measurements. A modified analysis utilizing cephalometric tracings was applied for both the groups, and the results were compared. Forty-nine subjects with mean age 11.8 ± 1.2 years were included (n = 14 for Group 1, n = 35 for Group 2). Mean Incisor-GALL distances were 3.71 ± 5.39 mm for females and 4.47 ± 5.06 mm for males. Correlation between analyses was excellent (intraclass correlation coefficient = 0.872). In conclusion, a modified approach to measuring the Incisor-GALL distance using standard orthodontic records correlated closely with the analysis described by Andrews. Normal values for this measurement are presented for Caucasian patients. Address correspondence and reprint requests to Dr Cory M. Resnick, DMD, MD, Department of Plastic and Oral Surgery, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115; E-mail: cory.resnick@childrens.harvard.edu Received 15 August, 2017 Accepted 12 October, 2017 Dr CMR and Dr ASR are married. This relationship did not introduce any conflict of interest into this study design or implementation, and Dr ASR is an independently credentialed research affiliate of Boston Children's Hospital. The authors report no conflicts of interest. © 2018 by Mutaz B. Habal, MD.

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