{"id":371,"date":"2018-03-01T08:45:43","date_gmt":"2018-03-01T11:45:43","guid":{"rendered":"http:\/\/pressreleases.scielo.org\/en\/?p=371"},"modified":"2023-03-29T12:23:26","modified_gmt":"2023-03-29T15:23:26","slug":"which-region-of-the-tmj-disc-we-find-the-highest-concentration-of-stresses-when-a-orthopedic-chin-cup-is-installed","status":"publish","type":"post","link":"https:\/\/pressreleases.scielo.org\/en\/2018\/03\/01\/which-region-of-the-tmj-disc-we-find-the-highest-concentration-of-stresses-when-a-orthopedic-chin-cup-is-installed\/","title":{"rendered":"Which region of the TMJ disc we find the highest concentration of stresses when a orthopedic chin cup is installed?"},"content":{"rendered":"

Por Fl\u00e1vio Siqueira Cal\u00e7ada, MSc in Temporomandibular Disorder and Orofacial Pain, S\u00e3o Leopoldo Mandic School of Dentistry, Campinas, SP, Brazil<\/strong>\"\"<\/a><\/p>\n

By means of computer simulation, researchers from S\u00e3o Leopoldo Mandic School of Dentistry, Campinas, S\u00e3o Paulo, Brazil, assessed stress generation on TMJ disc during orthopedic chin cup therapy. They found greater stress at the lower surface of the three-dimensional TMJ disc model where the mandibular condyle touches the structure. Results are disclosed by the article “Distribution of stress on TMJ disc induced by use of chin cup therapy: assessment by the finite element method\u201d published on Dental Press Journal of Orthodontics (DPJO), volume 22, number 5.<\/p>\n

A three-dimensional TMJ disc model was manufactured with a view to having stress distribution on TMJ disc induced by use of orthopedic chin cup assessed. Computed tomographic scans of a young dry scull provided data necessary for mandible and mandibular fossa manufacturing. The TMJ disc was graphically designed at the space between condyle and articular fossa with the aid of CAD-like software (Rhinoceros 3D). The model was immediately transferred to ANSYS software. The latter carried out simulations and estimated stress generated on TMJ disc by means of the finite element method (FEM).<\/p>\n

A 4.9-N (500g) load was applied on Pogonion at inclinations of 30.4 and 50 degrees relative to Gonion-Mental mandibular plane. Loads going in three different directions were decomposed at both y and z axes of ANSYS software, thus producing vectors necessary for different simulations. The vectors were directly applied to the lower surface of the TMJ disc model, particularly to the area touching the upper surface of the condyle. Stress deriving from compression and stress present at the disc model were assessed by means of FEM.<\/p>\n

Similarly to normal function, the TMJ disc absorbs load (TANAKA, et al<\/em>., 2001) and distributes stress generated by orthopedic therapy, thus transferring less intense stress to the mandibular fossa and cranial base. Another rather fruitful finding was that the more orthopedic appliance loads were simulated vertically, the more stress decreased at the three-dimensional model.<\/p>\n

Based on results obtained, clinicians are provided a better understanding of effects produced by this kind of therapy over morphologic changes and mandibular growth inhibition in their patients.<\/p>\n

References<\/h3>\n

TANAKA, E., et al<\/em>. Stress analysis in the TMJ during jaw openning by use of a three-dimensional finite element model based on magnetic resonance images. Int J Oral Maxillofac Surg<\/em>. [online]. 2001, vol. 30, no. 5, pp. 421-430, ISSN: 0901-5027 [viewed 26 February 2018]. DOI: 10.1054\/ijom.2001.0132<\/a>. Avaliable from: https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/11720045<\/a><\/p>\n

To read the article, access it:<\/h3>\n

CAL\u00c7ADA, F.S., et al<\/em>. Distribution of stress on TMJ disc induced by use of chincup therapy: assessment by the finite element method. Dental Press J. Orthod<\/em>. [online]. 2017, vol. 22, no. 5, pp. 83-89, ISSN: 2176-9451 [viewed 26 February 2018]. DOI: 10.1590\/2177-6709.22.5.083-089.oar<\/a>. Dispon\u00edvel em: http:\/\/ref.scielo.org\/nqw7g5<\/a><\/p>\n

\n

External Link<\/h3>\n

Dental Press Journal of Orthodontics \u2013 DPJO: <http:\/\/www.scielo.br\/dpjo<\/a>><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

The orthopedic chin cup is described in the literature since the beginning of the 19th century as an apparatus capable of inhibiting mandibular growth in young prognathic patients. This study carried out by means of computer simulation, allows clinical orthodontists to know the stresses of tension and comprehension induced in the TMJ disc by this therapy. …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":160,"featured_media":119,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[40,8,12],"tags":[41,202],"class_list":["post-371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dpjo","category-health-sciences","category-press-releases","tag-dental-press-journal-of-orthodontics","tag-dentistry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/users\/160"}],"replies":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/comments?post=371"}],"version-history":[{"count":6,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/371\/revisions"}],"predecessor-version":[{"id":374,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/371\/revisions\/374"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/media\/119"}],"wp:attachment":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/media?parent=371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/categories?post=371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/tags?post=371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}