Diagnostic Image Analyses of Activator Treated Temporomandibular Joint in Growth and Maturing Stages

Uematsu, Hideto; Ichida, Toshimichi; Masumi, Shin-ichi; Morimoto, Yasuhiro; Tanaka, Tatsurou; Konoo, Tetsuro; Yamaguchi, Kazunori

doi:10.1080/08869634.2002.11746217

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…2), which confirmed the increase of bone remodeling in the region (11). Another study (5) found similar evidence in patients treated with an activator appliance. This phenomenon was not seen when a twin-block appliance was used (4), probably because the MRI sequences were different.…”

Section: Discussionsupporting

confidence: 71%

“…In the second phase of treatment, fixed orthodontic appliances are used to refine occlusion (1,9). The responses of the temporomandibular joints (TMJs) treated using this method are controversial, which has led to the conduction of studies using the three-dimensional finite element method (10) as well as analyses in groups of experimental animals (11) or humans beings (1)(2)(3)(4)(5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

“…Class II malocclusion associated with mandibular retrognathism may be treated using orthopedic functional appliances in the first phase of treatment to advance the mandible and to improve its anteroposterior adjustment during growth (1)(2)(3)(4)(5)(6)(7)(8)(9). In the second phase of treatment, fixed orthodontic appliances are used to refine occlusion (1,9).…”

Section: Introductionmentioning

confidence: 99%

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Morphological Changes of Condyles and Helkimo Clinical Dysfunction Index in Patients Treated with Herbst - Orthodontic Appliance

et al. 2013

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This study evaluated the morphological changes in the temporomandibular joint (TMJ) condyles and calculated the Helkimo clinical dysfunction index (CDI) in adolescents with Class II Division 1 malocclusion and mandibular retrognathism treated with the Herbst appliance (phase I) and fixed orthodontic appliances (phase II). Thirty-two consecutive adolescents underwent phase I, and 23 completed phase II. The TMJs were evaluated qualitatively using magnetic resonance imaging (MRI) at the beginning of treatment (T 1 ), during phase I (T 2 ), at the end of phase I (T 3 ) and at the end of phase II (T 4 ). The CDI was calculated at T 1 , T 3 and T 4 . From T 1 to T 3 (p=0.326), there were no changes in condyle morphology in 86.0% of the TMJs. From T 3 to T 4 (p<0.05) and T 1 to T 4 (p<0.05), changes occurred in 39.1% and 43.4% of the condyles. No significant changes in CDI occurred from T 1 to T 3 , T 3 to T 4 and T 1 to T 4 (p=1.000; 86.6%, 76.2% and 76.2% concordance). After phase I, there were practically no changes in condyle morphology. At the end of phase II, a mild flattening was observed in some condyles. It may be concluded that no significant changes occurred in CDI after both treatment phases.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological Changes of Condyles and Helkimo Clinical Dysfunction Index in Patients Treated with Herbst - Orthodontic Appliance

et al. 2013

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“…[1][2][3][4][5] However, validity of 2D imaging is doubtful depending on the changes created by patients' head position and beam projection angle. 27 Anatomic superimposition and magnification differences of the left and right sides that cause double border of the mandible on the radiograph are the other disadvantages of conventional cephalometry.…”

Section: Discussionmentioning

confidence: 99%

Condylar response to functional therapy with Twin-Block as shown by cone-beam computed tomography

Yıldırım

Karaçay

Erkan

2014

The Angle Orthodontist

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Objective: To evaluate the condylar changes through cone-beam computed tomography (CBCT) images in patients treated with Twin-Block functional appliance. Materials and Methods: In this retrospective study, CBCT images of 30 patients who were treated with the Twin-Block appliance were used. Mandible was segmented and pretreatment and posttreatment (T0 and T1) condylar volume was compared. The angle between sella-nasion-Point A (SNA), angle between sella-nasion-Point B (SNB), angle between Point A-nasion-Point B (ANB), midfacial length (Co-A), mandibular length (Co-Gn), and the distances from right condylion to left condylion (Co R -Co L ) were also measured on three-dimensional images. Differences were analyzed with Wilcoxon signed rank tests, and Mann-Whitney U-tests were used to compare the scores of male and female participants. Significance was set at P , .05. Results: In this study, a decrease in SNA and ANB (P , .05 and P , .01, respectively) and an increase in SNB (P , .01) were found. Additionally, Co R -Co L , Co-Gn, and condylar volume increased at both the left and right sides (P , .01). However, increase at Co-A was not statistically significant (P . .05). Comparison of differences by sex was not statistically significant for all measurements (P . .05). Conclusion: Twin-Block appliance increases condylar volume, mandibular length, and intercondylar distance by stimulating growth of condyle in an upward and backward direction.

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“…In addition, DCLS could not be detected with orthopantomography [9–11] which differs from DCLS. Of course, the DCLS also differs from the “double contour” that occurs after orthodontic treatments in adults after the use of an activator for the same reason [13]. The signal differences in the TMJ seen by MRI between adults and schoolchildren are similar to the MRI characteristics of the normal maturation of growing cartilage [2–8].…”

Section: Mri Findings Of Mandibular Condyles In Adults and Schoolcmentioning

confidence: 99%

Alterations of the Temporomandibular Joint on Magnetic Resonance Imaging according to Growth and Development in Schoolchildren

Tanaka

Konoo

Habu

et al. 2012

International Journal of Dentistry

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The paper explains the alterations of the temporomandibular joint (TMJ) visualized by magnetic resonance imaging (MRI) according to the growth and development of schoolchildren. Appearance and disappearance of a “double contour-like structure” (DCLS) of the mandibular condyle on MRI according to the growth and development of schoolchildren were demonstrated. In addition, possible constituents of DCLS and the significance of detection of DCLS on MRI were also speculated. The relationship between red marrow and yellow marrow in the articular eminence of temporal bone, the disappearance of DCLS, and alterations of the mandibular condyle have been elucidated.

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Diagnostic Image Analyses of Activator Treated Temporomandibular Joint in Growth and Maturing Stages

Cited by 15 publications

References 14 publications

Morphological Changes of Condyles and Helkimo Clinical Dysfunction Index in Patients Treated with Herbst - Orthodontic Appliance

Morphological Changes of Condyles and Helkimo Clinical Dysfunction Index in Patients Treated with Herbst - Orthodontic Appliance

Condylar response to functional therapy with Twin-Block as shown by cone-beam computed tomography

Alterations of the Temporomandibular Joint on Magnetic Resonance Imaging according to Growth and Development in Schoolchildren

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