{"id":2436,"date":"2017-02-11T00:45:17","date_gmt":"2017-02-10T21:15:17","guid":{"rendered":"https:\/\/jamilian.net\/?p=2436\/"},"modified":"2026-06-20T15:07:30","modified_gmt":"2026-06-20T11:37:30","slug":"treatment-effects-of-the-r-appliance-and-twin-block-in-class-ii-division-1-malocclusion","status":"publish","type":"post","link":"https:\/\/jamilian.net\/en\/treatment-effects-of-the-r-appliance-and-twin-block-in-class-ii-division-1-malocclusion\/","title":{"rendered":"Treatment effects of the R-appliance and twin block in Class II division 1 malocclusion"},"content":{"rendered":"\n<p class=\"has-text-align-left wp-block-paragraph\">Jamilian A, Showkatbakhsh R, Amiri SS. Treatment effects of the R-appliance and twin block in Class II division 1 malocclusion. Eur J Orthod. 2011 Aug; 33(4):354-8<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Abstract<\/h3>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">The purpose of this study was to compare the effects of a differently designed functional appliance (the R-appliance) with a twin-block (TB)-treated group. Thirty patients (18 girls and 12 boys) with a mean age of 10.5\u00b10.7 years were treated with the R-appliance for 16.2\u00b10.3 months and 25 (11 boys and 14 girls) with a mean age of 11.2\u00b11.3 years with a TB for 16.1\u00b11.4 months (control). All had a Class II division 1 malocclusion due to mandibular deficiency. Lateral cephalograms obtained at the beginning (T1) and end (T2) of the study were analysed. Paired t-tests showed that SNB significantly increased in both groups. The incisor mandibular plane angle (IMPA) was reduced in the R-appliance group by 1.9\u00b14.9 degrees (P&lt;0.04) but increased by 0.5\u00b15.1 degrees (P&lt;0.6) in the TB group. SNA in the R-appliance group showed an increase of 0.2\u00b11.8 degrees (P&lt;0.5), while it was decreased by 0.2\u00b11.3 degrees (P&lt;0.3) in the TB group. Both treatment modalities were successful in moving the mandible forward. However, with the R-appliance, this was achieved without retroclination of the lower incisors.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jamilian A, Showkatbakhsh R, Amiri SS. Treatment effects of the R-appliance and twin block in Class II division 1 malocclusion. Eur J Orthod. 2011 Aug; 33(4):354-8 Abstract The purpose of this study was to compare the effects of a differently designed functional appliance (the R-appliance) with a twin-block (TB)-treated group. Thirty patients (18 girls and [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[229],"tags":[],"class_list":["post-2436","post","type-post","status-publish","format-standard","hentry","category-academic-orthodontic-research-en"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/posts\/2436","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/comments?post=2436"}],"version-history":[{"count":0,"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/posts\/2436\/revisions"}],"wp:attachment":[{"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/media?parent=2436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/categories?post=2436"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jamilian.net\/en\/wp-json\/wp\/v2\/tags?post=2436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}