Three-dimensional assessment of mandibular advancement 1 year after surgery

Carvalho, Felipe; Cevidanes, Lúcia Helena Soares; Motta, Alexandre Trindade Simões da; Almeida, Marco Antônio de; Phillips, Ceib

doi:10.1016/j.ajodo.2009.12.020

Cited by 15 publications

(16 citation statements)

References 25 publications

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“…In this context, several authors have described its application in the study of an extensive variety of TMDs, such as osteoarthritis, 32,33 trauma, 27 erosions, 29 osteophytes, 28 and developmental abnormalities. 27,38 In the field of orthognathic surgery, superimposition of 3D reconstructions from CBCT data allows not only the evaluation of changes in condylar morphology 39,40 and volume but also of potential positional changes of the condyle during the postoperative period. 4,41,9,42 This eliminates the need to perform linear measurements in 2D slices from CT scans, which have the inherent drawback of landmark identification in a non-fixed structure such as the condyle.…”

Section: Discussionmentioning

confidence: 99%

Semi-Automated Three-Dimensional Condylar Reconstruction

Méndez-Manjón

Haas

Guijarro‐Martínez

et al. 2019

Journal of Craniofacial Surgery

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The objective was to validate a semi-automated segmentation method for 3-dimensional (3D) reconstruction of the mandibular condyle from cone beam computed tomography (CBCT) data and illustrate its application in volumetric analysis of the condyle.Ten CBCT datasets were used to validate the proposed semiautomatic method for 3D rendering of mandibular condyles. First, a standardized orientation protocol of the skull was applied. After defining the volume of interest, a grey-scale cut-off value was selected to allow an automatic reconstruction of the condyle's surface. Subsequently, condylar contour was optimized manually. The whole process was repeated twice by 2 independent investigators. Volumetric measurements of the condyle were used as a measure of conformity between both investigators. The reproducibility of condylar volume reconstruction was excellent for intra-examiner measurements (CV ¼ 3.65%, intraclass correlation coefficient ¼ 0.97) and good for inter-examiner measurements (CV ¼ 7.15%, ICC ¼ 0.89). The overall mean time required for the segmentation process was 6.31 þ 2.78 minutes. The proposed protocol provides an accurate and reproducible tool for 3D reconstruction of the mandibular condyle using CBCT data. Its implementation will enable adequate follow-up of morphological changes in bone tissue with a Hounsfield unit-based imaging segmentation method.

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Section: Discussionmentioning

confidence: 99%

Semi-Automated Three-Dimensional Condylar Reconstruction

Méndez-Manjón

Haas

Guijarro‐Martínez

et al. 2019

Journal of Craniofacial Surgery

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“…Therefore, the need for long-term analyses was noticed in several publications (1,26,40,41,58). The impact of condyle displacements on changes in the TMJ is still debatable, and what is more the range and importance of those changes, which may be relevant regarding postsurgical normal function, is still unknown (7,30). Global analysis of mean values can be useful in the assessment of the general pattern and range of changes for specific conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Currently, computer techniques enable measurements to be taken from 3D models reconstructed from computed tomography scans. Three-dimensional methods have not only enabled the taking of more precise measurements (6,7), but also the observation of condylar surface changes (8), therefore allowing an accurate evaluation of bone remodeling. Considerations of the relationship between the positional changes of the condyle and the magnitude of the reposition of maxillofacial bone segments usually focus on selected displacements (9,10).…”

Section: Review Articlementioning

confidence: 99%

Mandibular condyle displacements after orthognathic surgery—an overview of quantitative studies

Pachnicz¹,

Ramos²

2021

Quant Imaging Med Surg

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The repositioning of bone segments during orthognathic surgeries often results in mandibular condyle positional changes and can also affect jaw muscles, soft tissues and the temporomandibular joint (TMJ). Condylar displacements are considered as one of the factors of bone remodeling and further skeletal relapse. The quantitative approach is commonly used in comparative analyses and evaluations of the relationships between examined factors. The aim of this study is the overview of the current literature including quantitative analysis in the research of mandibular condyle positional changes as a consequence of orthognathic surgeries. Thirty articles were included in the overview. Most of the articles present a comparative and evaluative analysis of treatment results concerning different surgical approaches, fixation methods or types of skeletal defects. The correlation between condylar displacements and bone remodeling, skeletal relapse and TMJ dysfunctions were considered. The most frequently repeated study variables were: short-term changes, Class III malocclusion, yaw rotation, 3D cephalometry measurements. Quantitative data might be useful in the evaluation of patterns and range of condylar displacements for specific treatment conditions. Available literature concerning the analysed topic is characterized by great heterogeneity with regards to the purpose and methodologies of the studies. More systematic approaches and long-term considerations are needed in future research.

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“…28 The anterior cranial base was used in previous voxel-based registration studies for evaluation of condylar remodelling. [29][30][31][32][33][34] However, due to postoperative positional changes of the mandible, it is impossible to distinguish condylar remodelling from condylar displacement. Hence, condylar remodelling cannot be accurately assessed using the cranial base as a reference, and thus, reference structures on the mandible have been suggested.…”

Section: Introductionmentioning

confidence: 99%

Comparison of surface- and voxel-based registration on the mandibular ramus for long-term three-dimensional assessment of condylar remodelling following orthognathic surgery

Holte

Sæderup

Pinholt

2022

Dentomaxillofacial Radiology

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Objectives: The purpose of the present study was to validate and compare the accuracy and reliability of surface- and voxel-based registration on the mandibular rami for long-term three-dimensional (3D) evaluation of condylar remodelling following Orthognathic Surgery. Methods: The mandible was 3D reconstructed from a pair of superimposed pre- and postoperative (two years) cone-beam computerized tomography scans and divided into the condyle, and 21 ramal regions. The accuracy of surface- and voxel-based registration was measured by the absolute mean surface distance of each region after alignment of the pre- and postoperative rami. To evaluate the reliability, mean absolute differences and intra class correlation coefficients (ICC) were calculated at a 95% confidence interval on volumetric and surface distance measurements of two observers. Paired t-tests were applied to statistically evaluate whether the accuracy and reliability of surface- and voxel-based registration were significantly different (p < 0.05). Results: A total of twenty subjects (sixteen female; four male; mean age 27.6 years) with class II malocclusion and maxillomandibular retrognathia, who underwent bimaxillary surgery, were included. Surface-based registration was more accurate and reliable than voxel-based registration on the mandibular ramus two years post-surgery (p < 0.05). The inter observer reliability of using surface-based registration was excellent, ICC range [0.82–1.00]. For voxel-based registration, the inter observer reliability ranged from poor to excellent [0.00–0.98]. The measurement error introduced by applying surface-based registration for assessment of condylar remodelling was considered clinical irrelevant (1.83% and 0.18 mm), while the measurement error introduced by voxel-based registration was considered clinical relevant (5.44% and 0.52 mm). Conclusions: Surface-based registration was proven more accurate and reliable compared to voxel-based registration on the mandibular ramus for long-term 3D assessment of condylar remodelling following Orthognathic Surgery. However, importantly, the performance difference may be caused by an inappropriate reference structure, proposed in the literature, and applied in this study.

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Three-dimensional assessment of mandibular advancement 1 year after surgery

Abstract: Introduction-This prospective observational study evaluated changes in the 3-dimensional position and remodeling of the mandibular rami, condyles, and chin at splint removal and 1 year after mandibular advancement surgery.

Cited by 15 publications

References 25 publications

Semi-Automated Three-Dimensional Condylar Reconstruction

Semi-Automated Three-Dimensional Condylar Reconstruction

Mandibular condyle displacements after orthognathic surgery—an overview of quantitative studies

Comparison of surface- and voxel-based registration on the mandibular ramus for long-term three-dimensional assessment of condylar remodelling following orthognathic surgery

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