Background: The aim of the survey was to obtain information on the treatment plan preferences, mechanics\r\nand characteristics of temporary anchorage device (TAD) application using a single case presented to orthodontists\r\nin Switzerland.\r\nMethods: A structured questionnaire to be completed by all study participants with case-specific (treatment plan\r\nincluding mechanics and TAD usage) and general questions (general fixed appliance and TAD usage as well as\r\nprofessional, educational and demographic questions) together with an orthodontic borderline case was utilised.\r\nThe case was a female adult with dental Class II/2, deep bite and maxillary anterior crowing, who had been\r\ntreated in childhood with extraction of four premolars and fixed appliance followed by wisdom tooth extraction.\r\nResults: The response rate was 24.4% (108 out of 443). The majority (96.3%, 104) proposed comprehensive\r\ntreatment, while 3.7% (4) planned only alignment of maxillary teeth. 8.3% (9) included a surgical approach in\r\ntheir treatment plan. An additional 0.9% (1) combined the surgical approach with Class II mechanics. 75.1% (81)\r\ndecided on distalization on the maxilla using TADs, 7.4% (8) planned various types of Class II appliances and 3.7%\r\n(4) combined distalization using TADs or headgear with Class II appliances and surgery. Palatal implants were the\r\nmost popular choice (70.6%, 60), followed by mini-screws (22.4%, 19) and mini-plates on the infrazygomatic crests\r\n(7.0%, 6). The preferred site of TAD insertion showed more variation in sagittal than in transversal dimension, and\r\nthe median size of mini-screws used was 10.0-mm long (interquartile range (IQR) 2.3 mm) and 2.0-mm wide\r\n(IQR 0.3 mm).\r\nConclusions: Distalization against palatal implants and then distalization against mini-screws were the most popular\r\ntreatment plans. Preferred site for TAD insertion varied depending on type and size but varied more widely in\r\nthe sagittal than in the transversal dimension
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