Three‐dimensional assessment of condylar position and joint spaces after maxillary first premolar extraction in skeletal Class <scp>II</scp> malocclusion

Alhammadi, Maged Sultan; Fayed, Mona M. Salah; Labib, Amr

doi:10.1111/ocr.12141

Cited by 27 publications

(23 citation statements)

References 22 publications

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“… 40 – 43 Alhammadi et al in 2016 investigated the 3D changes in the anteroposterior position of the mandibular condyle as well as the joint space parameters following the maxillary first premolar extraction in skeletal class II patients using the Pullinger method and found that there was a statistically significant posterior position of the condyle with relation to the vertical plane. 44 However in ours the right condyle exhibited more of a posterior displacement and left condyle exhibited more of an anterior displacement. This may be due to the reason as the patients included in our study most of them had a lower face deviation either to the right or left and also the surgical procedure performed are also different so different displacement of the condyle was expected.…”

Section: Discussioncontrasting

confidence: 51%

Three-Dimensional Cephalometric Analysis: The Changes in Condylar Position Pre- and Post-Orthognathic Surgery With Skeletal Class III Malocclusion

Shrestha¹,

Song

Aung

et al. 2020

Journal of Craniofacial Surgery

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The study includes 21 adult patients with skeletal class III malocclusion who underwent orthognathic surgery and had computed tomography images records presurgery (T0) up to 6 months after the surgery (T1). The computed tomography images were analyzed three-dimensionally using the Proplan CMF 3.0 software. Different skeletal and dental parameters were used in analyzing the cephalometric analysis of the patients. The change in the condylar axis angle was evaluated on 3 planes: axial, coronal, and sagittal. The anteroposterior position of the condyle in relation to the glenoid fossa was evaluated in the sagittal plane. ∠SNB, ∠ANB, ∠Left Y -axis, ∠Right Y -axis were statistically significant ( P < 0.01). Significant differences on the condylar axis angle were found between the groups on the sagittal plane ( P < 0.05) whereas no significant differences were noted on the axial and the coronal plane. In the anteroposterior condylar position related to the glenoid fossa, the condyle exhibited different displacement on different condyles. The right condyle exhibited more of the posterior displacement whereas the left condyle exhibited more of anterior displacement of the condyle in relation to the glenoid fossa. Numerous studies have done regarding the changes after postsurgery using the two-dimensional cephalometric analysis. Using the 3D techniques helps us to identify the cephalometric point more accurately which thus enhances the accuracy in the cephalometric analysis. However, care should be taken not to change the axis of rotation of the condyle to prevent from the treatment relapse and to avoid temporo-mandibular disorders.

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Section: Discussioncontrasting

confidence: 51%

Three-Dimensional Cephalometric Analysis: The Changes in Condylar Position Pre- and Post-Orthognathic Surgery With Skeletal Class III Malocclusion

Shrestha¹,

Song

Aung

et al. 2020

Journal of Craniofacial Surgery

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“…Currently, the root canals by clearing technique and the percentage of each type of maxillary first premolar were reported [15]. The CBCT method was used to investigate condylar position and joint spaces [16] and buccal bone thickness [17] of maxillary first premolar in adolescent population. However, the detailed information of root canal anatomy of maxillary first premolar using micro-CT remained largely unknown in the Chinese adolescent population.…”

Section: Introductionmentioning

confidence: 99%

Root Canal Anatomy of Maxillary First Premolar by Microscopic Computed Tomography in a Chinese Adolescent Subpopulation

Liu

Gao

Ruan

et al. 2019

BioMed Research International

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Objectives To investigate the root morphology and root canal anatomy of maxillary first premolar using microscopic computed tomography (micro-CT). Methods 324 maxillary first premolars were collected and scanned. The root and canal diameter, canal wall thickness, root taper, and cross-sectional shapes were determined in the single root with 1 canal (SR1C), single root with 2 canals (SR2C), and 2 roots with 2 canals (2R2C) by micro-CT. Results The results showed that single-rooted maxillary premolars were more common than other types. The incidence of SR1C, SR2C, and 2R2C reached 25%, 26.39%, and 26.39%, respectively. Root and canal diameters and canal wall thickness were decreased from coronal third to apical foramen. The three parameters and canal taper showed increases from buccal and palatal (BP) to mesiodistal (MD) aspects. The root canal tapers were smallest of the middle third level. The findings showed the different variations in 2R2C teeth. The root canal cross-sectional morphology in maxillary first premolars is complicated, including round, oval, long oval, flat canal, and irregular canal shapes. The distribution varied in different aspects. Conclusion Root canal morphology showed a wide variation and complicated structure. The single-rooted teeth were more common in the Chinese adolescent population, and the majority of maxillary first premolars have two canals.

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“…The standardised, stepwise, innovative 3D TMJ analysis designed by Alhammadi et al 30‐32 was applied in this study. To make these analyses reproducible, detailed steps are presented as online (Appendix ).…”

Section: Methodsmentioning

confidence: 99%

Three‐dimensional morphological and positional analysis of the temporomandibular joint in adults with posterior crossbite: A cross‐sectional comparative study

Almaqrami

Alhammadi

Tang

et al. 2021

J of Oral Rehabilitation

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Objectives The purpose of this study was to three‐dimensionally (3D) evaluate the morphological and positional features of the temporomandibular joint (TMJ) in adults with unilateral and bilateral posterior crossbite compared with aligned control subjects. Materials and Methods This cross‐sectional comparative study analysed cone beam computed tomography (CBCT) images of 90 adult subjects’ divided into three equal groups: bilateral posterior crossbite (BCG), unilateral posterior crossbite (UCG) and control group (CG). 3D measurements of the TMJ included the following: (a) position, angulation and inclination of the mandibular condyles; (b) centralisation of the condyles in their respective mandibular fossae; and (c) volumetric measurements of the TMJ spaces. Intra‐ and intergroup differences were identified using the paired Student's t test and an analysis of variance (ANOVA) followed by Tukey's post hoc test, respectively. Results Regarding the intra‐group side‐based comparisons, there were significant differences in the anterior and superior joint spaces and the anteroposterior condylar joint position in the UCG. Intergroup comparisons revealed significant differences in the vertical condylar inclination, medial condylar position, condylar width and height, and volumetric joint space between the unaffected side of the UCG and left sides of the other groups. There were significant differences in the anteroposterior condylar inclination, medial condylar position, condylar width and height, anterior, posterior, superior and volumetric joint spaces, and anteroposterior condylar joint position between the crossbite side of the UCG and the right sides of the other groups. Conclusion Skeletal crossbite accompanied with characteristic morphological and positional TMJ features associated with unilateral posterior crossbite and are associated with side‐specific TMJ asymmetry.

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Three‐dimensional assessment of condylar position and joint spaces after maxillary first premolar extraction in skeletal Class II malocclusion

Abstract: Posterior positioning of the condyle after orthodontic extraction and incisor retraction may occur, but its clinical significance requires further assessment in future studies.

Cited by 27 publications

References 22 publications

Three-Dimensional Cephalometric Analysis: The Changes in Condylar Position Pre- and Post-Orthognathic Surgery With Skeletal Class III Malocclusion

Three-Dimensional Cephalometric Analysis: The Changes in Condylar Position Pre- and Post-Orthognathic Surgery With Skeletal Class III Malocclusion

Root Canal Anatomy of Maxillary First Premolar by Microscopic Computed Tomography in a Chinese Adolescent Subpopulation

Three‐dimensional morphological and positional analysis of the temporomandibular joint in adults with posterior crossbite: A cross‐sectional comparative study

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