The Prediction Capacity 3-D Software, on a 2-D Analysis, in Planning the Positioning of the Upper Lip After Maxillary Advancement

Letícia Liana Chihara; Jéssica de Fátima Segantin; Paulo Esteves Pinto Faria; Eduardo Sant'Ana; Eduardo Dias-Ribeiro; Renato Luiz Maia Nogueira; Osny Ferreira-Júnior

doi:10.1177/1943387520906670

The Prediction Capacity 3-D Software, on a 2-D Analysis, in Planning the Positioning of the Upper Lip After Maxillary Advancement

Craniomaxillofac Trauma Reconstr. 2020 Jun;13(2):93-98. doi: 10.1177/1943387520906670. Epub 2020 Feb 20.

Authors

Letícia Liana Chihara¹, Jéssica de Fátima Segantin¹, Paulo Esteves Pinto Faria², Eduardo Sant'Ana¹, Eduardo Dias-Ribeiro³, Renato Luiz Maia Nogueira⁴, Osny Ferreira-Júnior¹

Affiliations

¹ Department of Oral and Maxillofacial Surgery, Bauru School of Dentistry, University of São Paulo (USP), Bauru, São Paulo, Brazil.
² Department of Oral and Maxillofacial Surgery, University of Ribeirão Preto (UNAERP), Ribeirão Preto, São Paulo, Brazil.
³ Department of Oral and Maxillofacial Surgery, School of Dentistry, Federal University of Campina Grande (UFCG), Patos, Paraíba, Brazil.
⁴ Department of Oral and Maxillofacial Surgery, School of Pharmacy, Dentistry and Nursing, Federal University of Ceará (UFC), Fortaleza, Ceará, Brazil.

Abstract

Purpose: The maxillary advancement using Le Fort I osteotomy directly affects in the positioning of the upper lip (UL) and the nasolabial angle (NLA), which plays an important role in facial expression and aesthetics, because of this, the aim of this study was to evaluate the ability of Dolphin Imaging 11.8 software in predicting changes to the UL position and NLA in patients undergoing maxillary advancement.

Materials and methods: It was a retrospective cohort study. Predictive and final tracings using pre- and postoperative Cone beam computed tomography (CBCT) of 24 patients undergoing maxillary advancement, regardless of mandibular movement, were compared. Whether the amount of advancement changes this predictability was also analyzed. The predictive and the 12-month postoperative data were evaluated using Dolphin Imaging 11.8 software and compared. Student t test was used to get the results.

Results: The vertical analysis of the incisal tip and cementoenamel junction of the upper central incisor (UCI) and of the UL were statistically significant (P = .001 for all). The horizontal measurements of the same variables (P = .238, P = .516, P = .930, respectively) and the NLA (P = .060) showed no statistical significance. The amount of advancement did not interfere with the variables analyzed, except for the exposure (P = .009) and inclination of the UCI (P = .010).

Conclusion: It was concluded that the amount of maxillary advancement does not interfere with the UL prediction; the prediction capacity of the software was good for the horizontal measurements, but had a significant error index for vertical measurements.

Keywords: Le Fort osteotomy; computed tomography; orthognathic surgery.