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

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

Abstract

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)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE FREITAS, BRUNA NEVES; MENDONCA, LUCAS MOREIRA; CRUVINEL, PEDRO BASTOS; DE LACERDA, TITO JOSE; JUNQUEIRA LEITE, FERNANDO GONCALVES; OLIVEIRA-SANTOS, CHRISTIANO; TIRAPELLI, CAMILA. Comparison of intraoral scanning and CBCT to generate digital and 3D-printed casts by fused deposition modeling and digital light processing. Journal of Dentistry, v. 128, p. 9-pg., 2022-12-16. (21/05160-2)