Education
Maryam Omidkhoda; Farzin Heravi; Fatemeh Shahrestani; Mohamad Noori
Abstract
Aim: The purpose of the present study was to evaluate the accuracy of Dolphin Imaging version 11.8 software, in predicting soft and hard tissue changes after orthognathic jaw surgery.Methods: In this retrospective study, pre- and postoperative cephalograms and photographs of 20 patients were scanned ...
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Aim: The purpose of the present study was to evaluate the accuracy of Dolphin Imaging version 11.8 software, in predicting soft and hard tissue changes after orthognathic jaw surgery.Methods: In this retrospective study, pre- and postoperative cephalograms and photographs of 20 patients were scanned and inserted into Dolphin Imaging version 11.8 software and traced by the software. Cephalometric superimposition was performed before and after the operation to determine the extent of changes in each jaw. The software then simulated postoperative images according to the calculated changes for each patient.Results: The results of this study showed that the upper lip had the highest accuracy in both sagittal and vertical axes. The highest reliability was in the upper lip with 80% error in the sagittal axis and the tip of the nose with 80% error in the vertical axis. The lowest accuracy in our study was related to soft tissue Menton which had the least reliability with an error frequency of 35% and 45% in the sagittal and vertical axis, respectively.Conclusion: Based on the method used and the findings obtained by digital measurements, it can be concluded that the Dolphin Imaging version 11.8 software can be used to reliably predict hard tissue as well as soft tissue, especially in the upper lip area.
Morteza Ordobazary; Masoud Davoudian
Abstract
Aim: Determining the proximity between predictions performed by Dolphin imaging software before and after the orthogonathic surgery with standard manual method.Methods and Materials: twenty long face C1 III patients, that had been undergone surgery were selected and their cephalograms and study ...
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Aim: Determining the proximity between predictions performed by Dolphin imaging software before and after the orthogonathic surgery with standard manual method.Methods and Materials: twenty long face C1 III patients, that had been undergone surgery were selected and their cephalograms and study cast records, before treatment, before surgery and after surgery were evaluated. The outcome was predicted with Dolphin imaging software and with standard manual method before and after surgery.Results: Differences of the variables by the software prediction in the presurgical and postsurgical stages in comparison with standard prediction method were usually insignificant.Conclusions: Dolphin imaging software (version 10.0) has a good accuracy for prediction of presurgical and postsurgical outcome of long face C1 III orthogonathic patients.
Tahereh Hosseinzadeh-Nik; Seyed Amir Reza Fatahi Meybodi; Negin Shahsavari
Abstract
Aim: This article is aimed at geometrical evaluation of antero-posterior displacement of incisor inferioris (Ii) and pogonion (Pog) following mandibular rotation and introducing a simple method to predict post surgical Holdaway ratio to evaluate the need for genioplasty.Materials and Method: First the ...
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Aim: This article is aimed at geometrical evaluation of antero-posterior displacement of incisor inferioris (Ii) and pogonion (Pog) following mandibular rotation and introducing a simple method to predict post surgical Holdaway ratio to evaluate the need for genioplasty.Materials and Method: First the geometrical factors affecting the displacement of a landmark following the mandibular rotation are discussed; namely α (the amount of mandibular rotation), r (the distance of the landmark from the center of rotation), and θ (the angle of the radius of the landmark from true horizontal line), Then the amount of displacement is calculated as d=2r[sirt(α/2)sin(α/2+θ)]. Finally prediction method of post surgical Holdaway ratio is described as adding the amount of "d " for Pog and Ii to pre surgical Holdaway ratio. This ratio in addition to position of Pog relative to facial skelton was used to predict the need for genioplasty. The application of this method is also demonstrated on an open bite patient as an example and the outcome is compared with manual prediction method.Results: The described method predicted the need for genioplasty the same way as manual prediction method.Conclusion: The geometrical prediction method can be of great value in determining the need of genioplasty following surgical mandibular rotation.
