Presentation Blocks: 03-22-2018 - Thursday - 11:00 AM - 12:15 PM

Title: Laypeople's Preference for Smile Esthetics Following Orthodontic Treatment


Johnny Gonzalez (Presenter)
Boston University

David Briss, Boston University
Melih Motro, Boston University
Ahmed Alsulaiman, Boston University


Objectives: To evaluate how certain visual extra- and intraoral smiling variables influence laypeople’s preference for a step or no step between the incisal edges of the maxillary central and lateral incisors in orthodontically treated patients, and how subject demographics may modify such an association. Results may yield clinical implications that could assist in orthodontic treatment planning.

Methods: Sixteen cropped, smiling photographs with differing esthetic variable combinations for skin pigmentation, lip thickness, amount of gingival exposure, and tooth length were duplicated and placed in a presentation, with one duplicated pairing per slide. One of the duplicates was modified utilizing a photograph editing software (Photoshop CS6) to create a 1mm step between central and lateral incisors, and the other had no step. Photos were shown to 126 laypeople, and they were asked to choose which smile they prefer for each pairing. Chi-square test and logistic regression analysis were performed using SAS.

Results: More females (59%) and college-educated people (66%) were surveyed than males and people who did not attend college. For seven esthetic categories, people preferred no step as compared to step. The odds ratio (0.42) suggests that females are more likely than males to prefer no step as compared to step when evaluating pink-pigmented skin, thick lips, short teeth, and low gingival exposure.

Conclusions: The results suggest that more people prefer no step between maxillary central and lateral incisors as compared to a step, and that patient background and demographics have little-to-no influence on this preference.