In vitro/in situ evaluation of mechanical and optical properties of 3D printing resins and long-term clinical and radiographic criteria of definitive single crowns printed in two resins and different macrogeometries of Morse taper implants

• Grant number: 23/17073-2
• Support Opportunities: Regular Research Grants
• Start date: March 01, 2025
• End date: February 29, 2028
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Ricardo Faria Ribeiro
• Grantee: Ricardo Faria Ribeiro
• Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Associated researchers: Adriana Cláudia Lapria Faria ; Cássio Do Nascimento ; Hugo Gaêta Araujo ; Renata Cristina Silveira Rodrigues Ferracioli
• Associated research grant(s): 25/03808-6 - Multi-user Equipment approved in grant 23/17073-2: microdurometer Shimadzu HMV-G31DT, AP.EMU

Abstract

The aim of this research project is to perform in vitro and in situ evaluations of the mechanical and optical properties of 3D printing resins associated with a clinical and radiographic assessment of single crowns with the application of these materials over implants of different macrogeometries. In the in vitro evaluation, samples will be made from the resins for 3D printing (Smart Print Bio Vitality®, Smart Dent and priZma 3D Bio Crown®, Makertech Labs) to assess color change, surface roughness, Knoop microhardness, flexural strength associated with Digital Image Correlation (DIC), reliability and survival and wear. For the in situ evaluation, participants will be selected and intraoral devices with fixed samples will be made. Participants will wear the device for 48 hours and biofilm covered area, color change, surface roughness and Knoop microhardness evaluations will be carried out. For the clinical evaluation, implants (n = 60) will be installed in patients (n = 30) who require two single crowns and are suitable for treatment. The implants will be divided into two groups (n = 30) according to the implant received (Maestro® CM AR, Implacil de Bortoli and Helix GM, Neodent®). Four to six months after implant surgery, each group will be divided into two subgroups (n = 15), which will receive crowns made from the two materials evaluated. Periodic evaluations will be carried out after (initial) 7 days, 1 month, 3 months, 4 months, 6 months, 12 months and 18 months, where data will be obtained on clinical and radiographic criteria such as ISQ (Implant Stability Quotient), BIC (Bone to Implant Contact), BAFO (Bone Area Fraction Occupied), PPD (probing depth), GI (gingival index) and PI (plaque index). Scan data will be taken of the prosthetic crown and the antagonist region, and superimposed (GOM Inspect, GOM GbmH) to obtain data on the wear over time of the materials tested and the antagonist teeth. The normality and homoscedasticity of the data will be assessed in order to choose the most appropriate statistical test. Comparisons will be made between evaluation times. (AU)