Thickness of the soft tissue layers and the articular disk in the temporomandibular joint

Hansson, Tommy; Oberg, T; Carlsson, Gunnar; Kopp, Sigvard

doi:10.3109/00016357709055993

Cited by 157 publications

(79 citation statements)

References 4 publications

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“…The disc thickness was measured separately for the anterior and posterior bands and for the intermediate zone as reported by Hansson et al 2 and by Kurita et al 14 ( Figure 2) using a computer-assisted imageanalyzing system (Qwin Pro, Leica Microsystem Imaging Solutions Ltd, Cambridge, UK). One disc in the experimental group was discarded because of a technical error in the tissue preparation.…”

Section: Thickness Measurementmentioning

confidence: 99%

Experimentally Created Nonbalanced Occlusion Effects on the Thickness of the Temporomandibular Joint Disc in Rats

Sun

Wang

et al. 2009

The Angle Orthodontist

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Objectives:To test the hypothesis that experimentally created physiologically nonbalanced occlusion will not affect the thickness of the temporomandibular joint (TMJ) discs in rats. Material and Methods: Twenty-four 8-week-old Sprague-Dawley rats were equally divided into a control group that was left untreated and an experimental group where a nonbalanced occlusion was created. Elastic rubber bands, 1 mm in diameter, were inserted and 1 week later were replaced by plastic material between the first and the second molars of the left maxillary and the right mandibular dentitions to move the first molars about 0.8 mm mesially. This created and maintained a physiologically nonbalanced occlusion. The animals were euthanized 8 weeks later, and the TMJ disc thickness was measured on histologically prepared slices using an electronic meter. Two-way univariate analysis of variance was used to compare the groups (␣ level ϭ .05). Results:The intermediate zone was thicker in the experimental group than in the control group (P ϭ .003), but no differences were found between groups regarding the anterior and posterior bands. There were no significant sex-related effects on this observation. Conclusion:The hypothesis is rejected. The results indicate that the intermediate zone of rat TMJ disc has the ability to adapt to the alteration of the space between condyle and fossa caused by occlusion changes. Further studies on larger groups that are followed for longer times are needed. (Angle Orthod. 2009;79:51-53.)

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Section: Thickness Measurementmentioning

confidence: 99%

Experimentally Created Nonbalanced Occlusion Effects on the Thickness of the Temporomandibular Joint Disc in Rats

Sun

Wang

et al. 2009

The Angle Orthodontist

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“…This joint surface has four different histological areas that give the TMJ distinctive properties (Hansson et al, 1977). The surface layer, called the joint or fibrous area, is formed by fibroblasts and has dense fibrous connective tissue with fibers strongly bound to support the forces of movement.…”

Section: Characteristics Of the Temporomandibular Jointmentioning

confidence: 99%

Role of Hyaluronic Acid in the Homeostasis and Therapeutics of Temporomandibular Joint Osteoarthritis

et al. 2017

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Morphol., 35(3):870-876, 2017. SUMMARY:The aim of this study was to perform a literature review regarding the role of hyaluronic acid (HA) in the homeostasis and therapeutics of temporomandibular joint (TMJ) osteoarthritis (OA). The TMJ has characteristics that give it special adaptation and recovery abilities, where HA plays a fundamental role in helping to maintain joint homeostasis, which is affected in pathological processes like OA. OA is a chronic degenerative multi-factor disease that can affect all the components of the synovial joints, causing degradation of the articular cartilage, extracellular matrix and breakage in the HA molecules. HA is a non-branched linear polysaccharide with viscosupplementation, anti-inflammatory, lubrication and pain relief effects; it also activates the intrinsic repair processes of the cartilage and normalizes the endogenous production of HA by the synoviocytes. In recent years, the therapeutic use of HA has shown evidence that supports its application in TMJ OA, improving viscosupplementation capacity, acting at the cellular and molecular levels, reducing various inflammatory mediators and improving the reparative characteristics. Its use has been studied in animal models and in humans. However, no consensus has been reached in terms of concentrations, dose, application frequency or molecular weight to be used.

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“…5, table 1 ). The thickness data were compared with those of Hansson et al [1977]. Vertical fiber number in the AB, IZ and PB was counted in the S plane sections (Appendix IV, table 2 ).…”

Section: Methodsmentioning

confidence: 99%

Organization and Function of the Collagen Fiber System in the Human Temporomandibular Joint Disk and Its Attachments

Scapino¹,

Obrez

Greising³

2006

Cells Tissues Organs

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The collagen fiber organization in the anterior band (AB), intermediate zone (IZ) and posterior band (PB) of the disk of the human jaw joint disk and in its attachments was studied under the polarizing microscope. Observations were made on serially sectioned joints (n = 6) and three sets of disk samples sectioned along mutually perpendicular planes (n = 21). The collagen fiber bundles in all disk regions branch and join or are decussated with other bundles. The fibers of the IZ were oriented generally parallel to the disk surfaces. Most of these fibers extend into the AB and PB where they either join with transverse or vertically oriented fiber groups or pass through the bands into the disk attachments. The lateral branching/decussation angles of fibers in the IZ and adjacent regions of the AB and PB were measured in the central region of four disks. The mean angle for all regions was 28 ± 13°. The mean angles in the region transitional between the IZ and AB and in the anterior region of the IZ were significantly greater than those in the posterior part of the IZ (p = 0.001 and 0.050 for the two comparisons). The large caliber, vertically oriented fibers in the AB, IZ and PB were counted in nine specimens. Disk dimensions were also measured in these specimens. The vertically and transversely oriented bundles were more frequent in the band regions. The number of vertically oriented fiber bundles varied within and between the disk bands. Vertical fiber number in the AB was greater laterally than medially (p = 0.04). In the PB the fiber number was greater than in either the AB or IZ (p = 0.000 for both comparisons) and within the PB itself the fiber number was greater in its thicker, medial half (p = 0.014). The fiber number in the AB and IZ was not different. The thickness of the AB, IZ and PB and disk length was measured in sections located laterally, centrally and medially. No difference in disk length was found across these planes. Statistically significant differences were found in regional disk thickness. In all of the mediolateral planes, the AB and PB were thicker than the IZ and the PB was thicker than the AB (p = 0.000 for all comparisons). The IZ was thicker medially than laterally (p = 0.034). The PB was thicker centrally and medially than laterally (p = 0.002 and 0.001, respectively). PB thickness in its central and medial regions was not different. The findings, combined with other evidence, suggest that the fiber system of the disk serves a stress distribution function and that within the AB and PB, the regions containing the greatest number of vertical fibers may also be the sites of greatest compressive stress during jaw function.

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Thickness of the soft tissue layers and the articular disk in the temporomandibular joint

Cited by 157 publications

References 4 publications

Experimentally Created Nonbalanced Occlusion Effects on the Thickness of the Temporomandibular Joint Disc in Rats

Experimentally Created Nonbalanced Occlusion Effects on the Thickness of the Temporomandibular Joint Disc in Rats

Role of Hyaluronic Acid in the Homeostasis and Therapeutics of Temporomandibular Joint Osteoarthritis

Organization and Function of the Collagen Fiber System in the Human Temporomandibular Joint Disk and Its Attachments

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