The accuracy of video imaging on the prediction of orthognatic patients profile

Alexandre Trindade Simões da MOTTA, Carlos Alexandre Leopoldo da CÂMARA, Cátia Cardoso Abdo QUINTÃO, Marco Antonio de Oliveira ALMEIDA

The aim of this study was to evaluate the accuracy of a video imaging software (Prescription Planner/Portrait, version 4.5) in predicting the soft tissue proile of 13 patients who underwent different types of orthognatic surgery. Preoperative and posttreatment lateral cephalograms and photographs were used to produce proile images. Predicted and inal proiles obtained from real cephalometric changes were compared by 20 orthodontists, assessing six variables: complete proile, nose, upper lip, lower lip, chin and cervical region. A questionary with a graduated line increasing in similarity was used to quantify the precision of the prediction, obtaining grades from 0 to 100. Means and standard deviations were obtained from the grades of each patient variables and of the sum of all the patients grades. Total means varied between 42.63 to 61.53. Nose was the variable of best prediction and lower lip was the variable of worst prediction. An individual analysis, relating the type of orthognatic surgery to the prediction characteristics, simulated the clinical use of the software. Factors related to the prediction of each region were indicated, as: type of surgery, amount of osseous displacement, use of soft tissue manipulating procedures, radiographic and photographic standardization, and postsurgical changes, like weight loss. The accuracy of the predictions was considered just reasonable, with some cases presenting important deiciencies. Therefore, this program is not indicated for an accurate planning treatment, but for the presentation of the case.

Keywords: Prediction. Video imaging. Orthognatic surgery.

Saturday, April 27, 2024 05:04