Three-dimensional positional assessment of glenoid fossae and mandibular condyles in patients with Class II subdivision malocclusion

Mattos, Juliana Macêdo de; Palomo, Juan Martín; Ruellas, Antônio Carlos de Oliveira; Cheib, Paula Loureiro; Eliliwi, Manhal; Souki, Bernardo Quiroga

doi:10.2319/121216-890.1

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…Overlapping of adjacent structures and complex anatomy causes difficulty in assessing TMJ by conventional imaging. 23 CBCT allows reconstruction of images in planes parallel and perpendicular to the long axis of the condyle, enabling thorough assessment of its position within the glenoid fossa. This also allows effective evaluation of the integrity of the bony structures.…”

Section: Temporomandibular Jointmentioning

confidence: 99%

Utilising CBCT in oral surgery

Mukherji,

Singh,

Nahar

et al. 2021

JOOO

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CBCT's popularity amongst the dentists was earned by its ability to provide comprehensive radiographic evaluation. It discloses veracious anatomic structures without any superimpositions or distortions and gives unmatched accuracy in measurement. Presently, CBCT renders profound benefits in different aspects of dentistry and is evolving further to expand its usefulness. In this article, the utility and advantages of CBCT are briefly highlighted with pictorial demonstrations.

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Section: Temporomandibular Jointmentioning

confidence: 99%

Utilising CBCT in oral surgery

Mukherji,

Singh,

Nahar

et al. 2021

JOOO

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“…The CBCT allowed observing a mandibular asymmetry, which was not demonstrated by previous analysis. Furthermore, de Mattos et al [17] showed a difference between the glenoid fossa of the Class II side compared to the contralateral one of the Class I side. Li et al [18] used CBCT analysis in combination with dental cast analysis and functional factors observation investigated by determination of the centric relation (CR)-centric occlusion (CO) discrepancies.…”

Section: Introductionmentioning

confidence: 98%

3D Facial Analysis in Class II Subdivision Malocclusion

Candida¹,

Grippaudo²,

Romeo³

et al. 2022

TODENTJ

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Background: Class II subdivision is an asymmetric condition presenting a Class I dental occlusion on one side and a Class II on the contralateral one. It presents a midline deviation that may be caused by a monolateral distalization of the mandible (type 1) or a mesialization of one side of the maxilla (type 2). The evaluation of asymmetry based on 2D radiographic records has been demonstrated to be less accurate than the one made using 3D radiographs. Objective: The aim of this work is to evaluate the facial asymmetry in a group of patients with Class II subdivision, compared to patients in Class I without evident asymmetry, by using 3D photographs of the face. Methods: 32 young adults with Class II subdivision were compared to a group of 32 subjects with bilateral Class I molar relationship. 3D photograph of their face was acquired using a stereophotogrammetric camera (3dMDtrio System-3dMD Atlanta, GA, USA). 3D photographs were imported into the Geomagic Software to create mirror 3D photography. Independent T-tests were made to compare facial asymmetries measured on Class II subdivision group with the Class I group. Results: The results show that there is a statistically significant difference in landmarks location between the control group and the experimental group regarding the values measured at the level of the lips and the perioral area. The asymmetry was more marked in patients with mandibular midline deviation. This is in line with previous observations with radiographic investigations. Conclusion: For a correct assessment of the asymmetry, a study of 3D photographs cannot replace an evaluation by cone beam, but it can be an important aid to estimate possible asymmetries in the perioral area and in the lip area.

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“…Li et al 25 also compared Class II subdivision cases with Class I malocclusions and showed that the asymmetry was associated with distal positioning of the glenoid fossa. de Mattos et al 26 supported that Class II subdivision malocclusions present with asymmetric glenoid fossa, with a distally and laterally positioned glenoid fossa on the Class II side. Sanders et al 24 studied CBCTs of Class II subdivisions and concluded that the aetiology is primarily due to an asymmetric mandible that is shorter and positioned posteriorly on the Class II side.…”

Section: Introductionmentioning

confidence: 99%

Asymmetry in Class II subdivision malocclusion: Assessment based on 3D surface models

Sencak,

Benavides,

Cevidanes

et al. 2023

Orthod Craniofacial Res

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IntroductionThere is currently no consensus in the literature whether the aetiology of a Class II subdivision is dental, skeletal or both. The aim of this study was to identify and quantify skeletal and dental asymmetries in Class II subdivision malocclusions.MethodsCBCTs from 33 Class II subdivision malocclusion patients were used to construct 3D volumetric label maps. Eighteen landmarks were identified. The original scan and associated 3D volumetric label map were mirrored. Registration of the original and mirrored images relative to the anterior cranial base, maxilla and mandible were performed. Surface models were generated, and 3D differences were quantified. Statistical analysis was performed.ResultsAnterior cranial base registration showed significant differences for fossa vertical difference, fossa roll, mandibular yaw, mandibular lateral displacement and lower midline displacement. Regional registrations showed significant differences for antero‐posterior (A‐P) mandibular length, maxillary roll, A‐P maxillary first molar position, maxillary first molar yaw and maxillary first molar roll. Class II subdivision patients also show an asymmetric mandibular length as well as an asymmetric gonial angle. Moderate correlations were found between the A‐P molar relationship and fossa A‐P difference, mandibular first molar A‐P difference, maxillary first molar A‐P difference and maxillary first molar yaw.ConclusionsThis study suggests that Class II subdivisions can result from both significant skeletal and dental factors. Skeletal factors include a shorter mandible as well as posterior and higher displacement of the fossa on the Class II side, resulting in mandibular yaw. Dental factors include maxillary and mandibular first molar antero‐posterior asymmetry.

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Three-dimensional positional assessment of glenoid fossae and mandibular condyles in patients with Class II subdivision malocclusion

Cited by 14 publications

References 23 publications

Utilising CBCT in oral surgery

Utilising CBCT in oral surgery

3D Facial Analysis in Class II Subdivision Malocclusion

Asymmetry in Class II subdivision malocclusion: Assessment based on 3D surface models

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