Erschienen in:
24.07.2021 | Original Article
Accuracy of three-dimensional soft tissue profile prediction in orthognathic surgery
verfasst von:
Amanda Lury Yamashita, Liogi Iwaki Filho, Flávio Wellington da Silva Ferraz, Adilson Luiz Ramos, Isolde Terezinha dos Santos Previdelli, Omar Cléo Neves Pereira, Elen de Souza Tolentino, Mariliani Chicarelli, Lilian Cristina Vessoni Iwaki
Erschienen in:
Oral and Maxillofacial Surgery
|
Ausgabe 2/2022
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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.