Three-dimensional condylar changes from Herbst appliance and multibracket treatment: A comparison with matched Class II elastics

Wei, Robert Y.; Atresh, Arjun; Ruellas, Antônio Carlos de Oliveira; Cevidanes, Lúcia Helena Soares; Nguyen, Tung; Larson, Brent E.; Mangum, Jonathan E.; Manton, David J.; Schneider, Paul M.

doi:10.1016/j.ajodo.2019.09.011

Cited by 15 publications

(22 citation statements)

References 48 publications

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“…CBCT has not been frequently used in the evaluation of condylar response to functional orthopaedic therapy in patients with skeletal Class II malocclusion [ 23 , 24 ]. However, only recently, CBCT was used for the 3D assessment of mandibular and glenoid fossa changes [ 13 , 14 , 25 , 26 ]. It has been demonstrated that CBCT provides accurate and reliable linear measurement of the TMJ dimensions of dry human skulls.…”

Section: Discussionmentioning

confidence: 99%

“…It was found that Herbst appliance treatment stimulated the condylar growth in the vertical direction [ 32 ]. The three-dimensional evaluation of skeletal mandibular changes following Herbst appliance have also shown greater 3D superior and posterior condylar growth than in their control group, resulting in significant mandibular forward displacement without pitch [ 14 , 26 , 33 ]. In the evaluation of changes in condylar volume, an average increase of 297 mm 3 was reported in both the right and left condylar volumes in response to functional therapy with the twin block appliance [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

“…Condylar positional changes within the fossa have also been proposed but have not been significantly confirmed in either animal or human studies. Recent 3D studies on Herbst therapy have widened the scope of evaluating positional changes of condyle [ 11 , 13 , 14 ]. Further, several methodological flaws still exist, recommending additional 3D investigations for a thorough understanding of the effect of functional appliances on TMJ [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Evaluation of Condyle-Glenoid Fossa Complex Following Treatment with Herbst Appliance

Nindra

Sidhu

Kochhar

et al. 2021

JCM

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The purpose of the present retrospective observational study was to compare the effects of treatment with Herbst appliance and fixed therapy with elastics on the condyle and glenoid fossa complex. Thirty patients aged between twelve and sixteen years with skeletal Class II malocclusion who met the inclusion criteria were included in the study: fifteen patients treated with Herbst appliance (Group 1), and fifteen patients treated with orthodontic camouflage using MBT prescription (MBTTM Versatile+ Appliance System) (Group 2). For Group 2, patients had CBCT scans taken before treatment either after Herbst appliance removal or at the end of treatment. CBCT scans were evaluated for changes in condyle-glenoid fossa complex using the In Vivo Dental 5.1 software. Statistical significance was set at p ≤ 0.05. On inter-group comparison, the Herbst group showed statistically significant increases in the condylar height of 1.35 mm (p ≤ 0.001) on the right and 1.21 mm (p ≤ 0.01) on the left side, and a condylar volume of 111.03 mm3 (p ≤ 0.01) on the right and 127.80 mm3 (p ≤ 0.001) on the left side. The Herbst group showed anterior remodelling on the postero-superior aspect of glenoid fossa. Herbst appliance treatment induced growth at the condylar head and anterior remodelling of glenoid fossa, thereby improving the maxilla-mandibular relationship in growing Skeletal Class II patients.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-Dimensional Evaluation of Condyle-Glenoid Fossa Complex Following Treatment with Herbst Appliance

Nindra

Sidhu

Kochhar

et al. 2021

JCM

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“…Indeed, multiple attempts at mandibular segmentation and superimposition based on 3D CBCT imaging have been reported [ 13 , 14 , 15 , 16 , 17 ]. For instance, a significant amount of research into mandibular measurements has been conducted with such methods in the past few months [ 17 , 18 , 19 , 20 ], evidencing the high demand for 3D-based mandibular measurements. However, all of these pioneering methods utilize either open-source software such as ITK-Snap ( ) and 3D Slicer ( ) or licensure-required software such as Mimics (Materialise, NV) [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, a significant amount of research into mandibular measurements has been conducted with such methods in the past few months [ 17 , 18 , 19 , 20 ], evidencing the high demand for 3D-based mandibular measurements. However, all of these pioneering methods utilize either open-source software such as ITK-Snap ( ) and 3D Slicer ( ) or licensure-required software such as Mimics (Materialise, NV) [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Since the software packages mentioned above are not specifically designed for orthodontic applications, multiple software packages are generally necessary to analyze a single case.…”

Section: Introductionmentioning

confidence: 99%

A User-Friendly Protocol for Mandibular Segmentation of CBCT Images for Superimposition and Internal Structure Analysis

Lin

Zheng

et al. 2021

JCM

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Background: Since cone-beam computed tomography (CBCT) technology has been widely adopted in orthodontics, multiple attempts have been made to devise techniques for mandibular segmentation and 3D superimposition. Unfortunately, as the software utilized in these methods are not specifically designed for orthodontics, complex procedures are often necessary to analyze each case. Thus, this study aimed to establish an orthodontist-friendly protocol for segmenting the mandible from CBCT images that maintains access to the internal anatomic structures. Methods: The “sculpting tool” in the Dolphin 3D Imaging software was used for segmentation. The segmented mandible images were saved as STL files for volume matching in the 3D Slicer to validate the repeatability of the current protocol and were exported as DICOM files for internal structure analysis and voxel-based superimposition. Results: The mandibles of all tested CBCT datasets were successfully segmented. The volume matching analysis showed high consistency between two independent segmentations for each mandible. The intraclass correlation coefficient (ICC) analysis on 20 additional CBCT mandibular segmentations further demonstrated the high consistency of the current protocol. Moreover, all of the anatomical structures for superimposition identified by the American Board of Orthodontics were found in the voxel-based superimposition, demonstrating the ability to conduct precise internal structure analyses with the segmented images. Conclusion: An efficient and precise protocol to segment the mandible while retaining access to the internal structures was developed on the basis of CBCT images.

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Six years long term evaluation of a class II division 1 patient treated with Herbst appliance and 2 miniscrews in the lower arch as anchorage reinforcement: A case report

Manni¹,

Papi

Migliorati

2022

International Orthodontics

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Three-dimensional condylar changes from Herbst appliance and multibracket treatment: A comparison with matched Class II elastics

Cited by 15 publications

References 48 publications

Three-Dimensional Evaluation of Condyle-Glenoid Fossa Complex Following Treatment with Herbst Appliance

Three-Dimensional Evaluation of Condyle-Glenoid Fossa Complex Following Treatment with Herbst Appliance

A User-Friendly Protocol for Mandibular Segmentation of CBCT Images for Superimposition and Internal Structure Analysis

Six years long term evaluation of a class II division 1 patient treated with Herbst appliance and 2 miniscrews in the lower arch as anchorage reinforcement: A case report

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