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European Journal of Oral Implantology
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Eur J Oral Implantol 8 (2015), No. 4     7. Dec. 2015
Eur J Oral Implantol 8 (2015), No. 4  (07.12.2015)

Page 397-403, PubMed:26669549


The Smile Esthetic Index (SEI): A method to measure the esthetics of the smile. An intra-rater and inter-rater agreement study
Rotundo, Roberto / Nieri, Michele / Bonaccini, Daniele / Mori, Massimiliano / Lamberti, Elena / Massironi, Domenico / Giachetti, Luca / Franchi, Lorenzo / Venezia, Piero / Cavalcanti, Raffaele / Bondi, Elena / Farneti, Mauro / Pinchi, Vilma / Buti, Jacopo
Purpose: To propose a method to measure the esthetics of the smile and to report its validation by means of an intra-rater and inter-rater agreement analysis.
Materials and methods: Ten variables were chosen as determinants for the esthetics of a smile: smile line and facial midline, tooth alignment, tooth deformity, tooth dischromy, gingival dischromy, gingival recession, gingival excess, gingival scars and diastema/missing papillae. One examiner consecutively selected seventy smile pictures, which were in the frontal view. Ten examiners, with different levels of clinical experience and specialties, applied the proposed assessment method twice on the selected pictures, independently and blindly. Intraclass correlation coefficient (ICC) and Fleiss' kappa) statistics were performed to analyse the intra-rater and inter-rater agreement.
Results: Considering the cumulative assessment of the Smile Esthetic Index (SEI), the ICC value for the inter-rater agreement of the 10 examiners was 0.62 (95% CI: 0.51 to 0.72), representing a substantial agreement. Intra-rater agreement ranged from 0.86 to 0.99. Inter-rater agreement (Fleiss' kappa statistics) calculated for each variable ranged from 0.17 to 0.75.
Conclusion: The SEI was a reproducible method, to assess the esthetic component of the smile, useful for the diagnostic phase and for setting appropriate treatment plans.

Keywords: classification, diagnosis, esthetics, index, smile
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