Post-operative soft tissue changes in patients with mandibular prognathism after bimaxillary surgery

Oh, Kyung-Min; Seo, Sung Kyung; Park, Jeong Eon; Sim, Hyoung Seob; Cevidanes, Lucia; Kim, Yoon Ji R.; Park, Yang Ho

doi:10.1016/j.jcms.2012.09.001

Cited by 52 publications

(28 citation statements)

References 26 publications

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“…17,20 So the observation period for our study was chosen in accordance with reports showing stable results after 3 months and up to around 6 months after surgery. 21 Figure 4 shows that the differences between the left and right sides in the same regions were minimal, with less than expected (method) errors, so we decided to use their average values for further statistical analysis. This also confirmed the exclusion of greater asymmetries.…”

Section: Discussionmentioning

confidence: 99%

“…After bimaxillary procedures, more complicated patterns of movement of the maxilla compared to BSSO alone, mostly described using the ratios of soft-to-hard tissue displacement, have been identified by several investigators. 21 facial regions was used in a study in which 3D changes were observed after BIMAX procedures in CSIII. 25 The greatest changes were found in almost all regions in the BIMAX group, which was probably due to the fact that this type of operation is indicated for patients with the greatest amount of CSIII deformity.…”

Section: Discussionmentioning

confidence: 99%

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Differences in three-dimensional soft tissue changes after upper, lower, or both jaw orthognathic surgery in skeletal class III patients

Verdenik

Hren

2014

International Journal of Oral and Maxillofacial Surgery

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Differences in three-dimensional soft tissue changes after upper, lower, or both jaw orthognathic surgery in skeletal class III patients

Verdenik

Hren

2014

International Journal of Oral and Maxillofacial Surgery

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“…23 Palatal plane angle was defined as the angle formed by the FH plane and the line through ANS and posterior nasal spine (PNS). Occlusal plane angle was formed by the FH plane and the line through the midpoint of the maxillomandibular central incisors and the intersection point of the first molars of maxilla and mandible on the midsagittal plane.…”

Section: Skeletal Horizontal Planesmentioning

confidence: 99%

Three-dimensional changes of the hyoid bone and airway volumes related to its relationship with horizontal anatomic planes after bimaxillary surgery in skeletal Class III patients

Kim

Choi

et al. 2013

The Angle Orthodontist

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Objective: To evaluate longitudinal changes of the hyoid bone position and pharyngeal airway space after bimaxillary surgery in mandibular prognathism patients. Materials and Methods: Cone-beam computed tomography scans were taken for 25 mandibular prognathism patients before surgery (T0), 2 months after surgery (T1), and 6 months after surgery (T2). The positional displacement of the hyoid bone was assessed using the coordinates at T0, T1, and T2. Additionally, the volume of each subject's pharyngeal airway was measured. Results: The mean amount of posterior maxilla impaction was 3.76 ± 1.33 mm as the palatal plane rotated 2.04° ± 2.28° in a clockwise direction as a result of bimaxillary surgery. The hyoid bone moved backward (P < .05, P < .001) and downward (P > .05, P < .05) at 2 months and 6 months after surgery, while the total volume of the pharyngeal airway significantly decreased at the same time points (P < .001, P < .001). There was significant relationship between the changes of the hyoid bone position and airway volume at 2 months after surgery (P < .05). The change of the palatal plane angle was positively correlated to the decrease in the total airway volume (P < .001). Conclusions: The null hypothesis was rejected. The hyoid bone moved inferoposteriorly, and the pharyngeal airway volume decreased for up to 6 months after bimaxillary surgery. The decrease in the pharyngeal airway volume was correlated to the changes in the palatal plane inclination and the positional change of the hyoid bone.

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“…Accurate visualization of the face, jaws, and its components are important for clinical diagnostics and decision-making [4]. Nowadays, the application of 3D cephalometric analysis plays an important role in cases of complex maxillo-facial abnormalities [5, 6] and for the evaluation of growth or treatment outcomes [7–9]. Accurate 3D surface-rendered models, especially of the hard tissues, are crucial in applications such as virtual surgical planning on patients undergoing orthognathic surgery, during dental implant and prosthetic procedures, and when simulating treatment outcomes [10–15].…”

Section: Introductionmentioning

confidence: 99%

Soft tissue coverage on the segmentation accuracy of the 3D surface-rendered model from cone-beam CT

2016

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ObjectivesThe aim of this study is to investigate the effect of soft tissue presence on the segmentation accuracy of the 3D hard tissue models from cone-beam computed tomography (CBCT).Materials and methodsSeven pairs of CBCT Digital Imaging and Communication in Medicine (DICOM) datasets, containing data of human cadaver heads and their respective dry skulls, were used. The effect of the soft tissue presence on the accuracy of the segmented models was evaluated by performing linear and angular measurements and by superimposition and color mapping of the surface discrepancies after splitting the mandible and maxillo-facial complex in the midsagittal plane.ResultsThe linear and angular measurements showed significant differences for the more posterior transversal measurements on the mandible (p < 0.01). By splitting and superimposing the maxillo-facial complex, the mean root-mean-square error (RMSE) as a measurement of inaccuracy decreased insignificantly from 0.936 to 0.922 mm (p > 0.05). The RMSE value for the mandible, however, significantly decreased from 1.240 to 0.981 mm after splitting (p < 0.01).ConclusionsThe soft tissue presence seems to affect the accuracy of the 3D hard tissue model obtained from a cone-beam CT, below a generally accepted level of clinical significance of 1 mm. However, this level of accuracy may not meet the requirement for applications where high precision is paramount.Clinical relevanceAccuracy of CBCT-based 3D surface-rendered models, especially of the hard tissues, are crucial in several dental and medical applications, such as implant planning and virtual surgical planning on patients undergoing orthognathic and navigational surgeries. When used in applications where high precision is paramount, the effect of soft tissue presence should be taken into consideration during the segmentation process.

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Post-operative soft tissue changes in patients with mandibular prognathism after bimaxillary surgery

Cited by 52 publications

References 26 publications

Differences in three-dimensional soft tissue changes after upper, lower, or both jaw orthognathic surgery in skeletal class III patients

Differences in three-dimensional soft tissue changes after upper, lower, or both jaw orthognathic surgery in skeletal class III patients

Three-dimensional changes of the hyoid bone and airway volumes related to its relationship with horizontal anatomic planes after bimaxillary surgery in skeletal Class III patients

Soft tissue coverage on the segmentation accuracy of the 3D surface-rendered model from cone-beam CT

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