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Accuracy of dental models produced with additive manufacturing: influence of the edentulous space and image acquisition method

Grant number: 21/05160-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2021
Effective date (End): August 31, 2022
Field of knowledge:Health Sciences - Dentistry - Dental Radiology
Principal researcher:Camila Tirapelli
Grantee:Marianna Soares Nogueira Borges
Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


The objective of this study is to evaluate the accuracy of dental models produced by additive manufacturing considering different methods of image acquisition and edentulous spaces. Two master models representing upper Kennedy's Class III and IV dental arches will be measured with a caliper with a resolution of 0.01mm at the following areas: 1) edentulous border: distance between canines passing through the midline (Kennedy class IV) and between the 1st premolar and the 2nd molar (Kennedy class III), 2) Interarch: distance between canines, 1st premolar, 2nd premolar and 1st molar to their opposite equivalents (Kennedy class IV) and 2nd molar to its opposite (Kennedy class III), 3) occlusal cervical: distance from the tips of the canine cusps, 1st and 2nd premolars and 1st right molar (Kennedy class IV) and 2nd right molar (Kennedy class III) up to the respective cervical limited by the "gingival tissue". After, the master models will be digitized using an intraoral scanner (IOS), extraoral scanner (EOS), and cone-beam computed tomography (CBCT). Ten scans will be obtained from each modality. On the STL (standard triangle language) digital models from the IOS, EOS, and CBCT, the same distances assessed on the master models will be measured (Meshmixer software). Consecutively, the files will be prepared to produce models through additive manufacturing (3D printing), based on SLA (stereolithography) technology, using 405nm UV light (ultraviolet) polymerizable resin. On the 3D printed models obtained, the same measurements made at the master models will be done using the same caliper. The absolute error between the measurements done at class III and IV master models and their respective digital and printed models will be obtained. Absolute errors will be compared between groups using ANOVA-two way and later Tukey's test. (AU)

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