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. 2022 Jun;26(2):271-279.
doi: 10.1007/s10006-021-00988-2. Epub 2021 Jul 24.

Accuracy of three-dimensional soft tissue profile prediction in orthognathic surgery

Amanda Lury Yamashita  1 , Liogi Iwaki Filho  2 , Flávio Wellington da Silva Ferraz  3 , Adilson Luiz Ramos  2 , Isolde Terezinha Dos Santos Previdelli  4 , Omar Cléo Neves Pereira  4 , Elen de Souza Tolentino  2 , Mariliani Chicarelli  2 , Lilian Cristina Vessoni Iwaki  2
Affiliations

Accuracy of three-dimensional soft tissue profile prediction in orthognathic surgery

Amanda Lury Yamashita et al. Oral Maxillofac Surg. 2022 Jun.

Abstract

Purpose: To evaluate the accuracy of three-dimensional (3D) soft tissue prediction in bimaxillary orthognathic surgery.

Methods: Cone-beam computed tomographs of 88 patients with class II (n = 46) and class III (n = 42) malocclusions, who underwent bimaxillary orthognathic surgery, were included in this retrospective study. 3D soft tissue prediction and postoperative outcome were compared by using ten landmarks of facial soft tissues. Patients' sex and age were also assessed. Results were analyzed using a mixed model methodology (p < 0.05).

Results: The success criterion adopted was a mean discrepancy of < 2 mm. Most mandibular landmarks indicated a tendency for underprediction with a downward direction in class II patients, with some values > 2 mm. In class III, there was overprediction with a downward direction for the mandibular landmarks, with values < 2 mm. More accurate results were found in female and older patients.

Conclusions: 3D surgical planning showed clinically acceptable results for predicting soft tissues in patients undergoing bimaxillary orthognathic surgery, with more accurate results for class III patients. Although some differences were found when age and sex were interacted, a consistent association between these variables could not be stated. These results support the clinician, as accuracy can provide a strong guide to the surgeon when planning surgical orthodontic treatment.

Keywords: 3D imaging; Cone-beam computed tomography; Orthognathic surgery; Soft tissue prediction.

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