{"id":1993,"date":"2021-07-26T10:00:53","date_gmt":"2021-07-26T08:00:53","guid":{"rendered":"https:\/\/www.dentalcadmos.com\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/"},"modified":"2021-07-26T10:00:53","modified_gmt":"2021-07-26T08:00:53","slug":"orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs","status":"publish","type":"post","link":"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/","title":{"rendered":"Orthodontic treatment and third molars development: longitudinal study on radiographs"},"content":{"rendered":"<p>                    <b>Objectives <\/b>The purpose of this study was to evaluate the effects of first premolar extraction on third molar angulation during fixed orthodontic treatment.<\/p>\n<p><b>Materials and methods&nbsp; <\/b>  The sample of this study included pre-treatment and post-treatment orthopantomographs (OPG) of 40 patients, 17 males and 23 women (106 third molars), treated by fixed orthodontic appliances at the De\u00adpartment of Orthodontics, Sapien\u00adza University, Rome. All individuals had both first and second mandib\u00adular molars present at all stages and initial malocclusion. Records \u2013 including dental study models, lat\u00aderal cephalograms, panoramic ra\u00addiographs, and facial photographs \u2013 were collected before, during and after orthodontic treatment.<\/p>\n<p>The sample of patients was divid\u00aded into two sub-groups:<\/p>\n<ul>\n<li>a group of 20 patients who have received orthodontic treatment without premolar extractions;<\/li>\n<li>a second group of 20 patients treated with premolar ex\u00adtractions.<\/li>\n<\/ul>\n<p>Pre-treatment mean age of the ex\u00adtraction group was 13.17 years (\u00b11.54), and 12.23 years (\u00b11.45) for the non extraction group. The mean duration of treatment was 5.17 years (\u00b11.12) in the extraction group and 4.53 years (\u00b11.00) in the non extraction group.<\/p>\n<p>The inclusion criteria in the study group were the following:<\/p>\n<ul>\n<li><!--[endif]-->existence of longitudinal series of orthopantomograms (OPG) pre-treatment (T1), during treatment (T2) and post-treat\u00adment (T3);<\/li>\n<li><!--[endif]-->the crowns of the third molar formed at the beginning of the orthodontic treatment;<\/li>\n<li>second premolars and second molars fully erupted into the mouth;<\/li>\n<li>patients treated with fixed or\u00adthodontic appliances (maxillary and mandibular).<\/li>\n<\/ul>\n<p>Both pre- and post-treatment ra\u00addiographs were evaluated by us\u00ading the following techniques:<\/p>\n<ul>\n<li>tracing the images of the teeth on the acetate paper;<\/li>\n<li>angular measurements of refer\u00adence lines (the anterior angle formed between the long axis of the third molar and the long ax\u00adis of the second molar [\u2221M3-M2] and the anterior an\u00adgle between the long axis of the third molar and the occlusal plane [\u2221M3-OP]).<\/li>\n<\/ul>\n<p>The post-treatment values were subtracted from pre-treatment values to calculate the degree of changes in the angulation of third molar relative to the occlusal plane and second molars.<\/p>\n<p>The data were analysed by Stu\u00addent\u2019s t-test. A p value \u22640.05 was considered as significant.<\/p>\n<p><b>Results and conclusions&nbsp; <\/b>The data show that the uprighting of the wisdom tooth long axis is more important in patients treated with premolar extractions.   The angle between the maxillary third and the second molar has decreased, the third molar axis has uprighted, but only in patients treated with premolar extractions.<\/p>\n<p>In the group of patients treated without extractions, the results showed increased values of this angle, pointing an unfavourable change in the wisdom tooth an\u00adgulation.   In both groups of patients, the changes in maxillary third molars angulation resulting from ortho\u00addontic treatment showed statisti\u00adcally significant values.<\/p>\n<p><b>Clinical significance&nbsp; <\/b>The ability to early predict the fu\u00adture evolution of the developing third molars can be of great help in planning orthodontic, surgical and prosthetic treatment. The ex\u00adtraction of first premolars during orthodontic treatment significantly improved the angulation of third molars toward uprighting. <\/p>\n<p>Howev\u00ader, an improvement in angulation does not necessarily mean that third molars will erupt in good po\u00adsition. Therefore it may be prudent for orthodontists to inform their patients that premolar extractions may not prevent the need for third molar extractions in future.       <\/p>\n<p><i>Per continuare la lettura scaricare l&#8217;allegato.<\/i><\/p>\n<p><b>doi: <a href=\"https:\/\/doi.org\/10.19256\/d.cadmos.09.2019.5\">https:\/\/doi.org\/10.19256\/d.cadmos.09.2019.5<\/a><\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Objectives The purpose of this study was to evaluate the effects of first premolar extraction on third molar angulation during fixed orthodontic treatment. Materials and methods&nbsp; The sample of this study included pre-treatment and post-treatment orthopantomographs (OPG) of 40 patients, 17 males and 23 women (106 third molars), treated by fixed orthodontic appliances at the &hellip; <a href=\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/\">Continued<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Orthodontic treatment and third molars development: longitudinal study on radiographs - Dental Cadmos<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Orthodontic treatment and third molars development: longitudinal study on radiographs - Dental Cadmos\" \/>\n<meta property=\"og:description\" content=\"Objectives The purpose of this study was to evaluate the effects of first premolar extraction on third molar angulation during fixed orthodontic treatment. Materials and methods&nbsp; The sample of this study included pre-treatment and post-treatment orthopantomographs (OPG) of 40 patients, 17 males and 23 women (106 third molars), treated by fixed orthodontic appliances at the &hellip; Continued\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/\" \/>\n<meta property=\"og:site_name\" content=\"Dental Cadmos\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-26T08:00:53+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Greta Schincaglia\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.dentalcadmos.com\/#website\",\"url\":\"https:\/\/www.dentalcadmos.com\/\",\"name\":\"Dental Cadmos\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.dentalcadmos.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/#webpage\",\"url\":\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/\",\"name\":\"Orthodontic treatment and third molars development: longitudinal study on radiographs - Dental Cadmos\",\"isPartOf\":{\"@id\":\"https:\/\/www.dentalcadmos.com\/#website\"},\"datePublished\":\"2021-07-26T08:00:53+00:00\",\"dateModified\":\"2021-07-26T08:00:53+00:00\",\"author\":{\"@id\":\"https:\/\/www.dentalcadmos.com\/#\/schema\/person\/03773f859d81b9eff9790a180b88dd5e\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.dentalcadmos.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Orthodontic treatment and third molars development: longitudinal study on radiographs\"}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.dentalcadmos.com\/#\/schema\/person\/03773f859d81b9eff9790a180b88dd5e\",\"name\":\"Greta Schincaglia\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.dentalcadmos.com\/#personlogo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/5d4eda3c3873680e78bca07f48f82b5d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/5d4eda3c3873680e78bca07f48f82b5d?s=96&d=mm&r=g\",\"caption\":\"Greta Schincaglia\"},\"url\":\"https:\/\/www.dentalcadmos.com\/en\/author\/almaware\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Orthodontic treatment and third molars development: longitudinal study on radiographs - Dental Cadmos","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.dentalcadmos.com\/en\/orthodontic-treatment-and-third-molars-development-longitudinal-study-on-radiographs\/","og_locale":"en_US","og_type":"article","og_title":"Orthodontic treatment and third molars development: longitudinal study on radiographs - Dental Cadmos","og_description":"Objectives The purpose of this study was to evaluate the effects of first premolar extraction on third molar angulation during fixed orthodontic treatment. 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