Comparative study of manufacturing techniques of maxillary complete-arch prosthesis (All-on-4): planning, materials, marginal misfit, loosening torque, ceramic coverage, mechanical cycling and stress distribution

• Grant number: 17/15297-0
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): November 01, 2017
• Effective date (End): February 28, 2019
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Marcelo Ferraz Mesquita
• Grantee: Thaís Barbin
• Host Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil

Abstract

The aim of this study is to evaluate and compare in simulated models of rehabilitated complete edentulous maxilla (All-on-Four): 1- Three techniques and materials (frameworks): A- Casting in Co-Cr; B- CAD-CAM in Zirconia (subtractive technique); and C- CAD-CAM in Ti-cp.(additive technique); and 2- The effect of: A- application of aesthetic veneering about marginal misfit and distribution of tensions; B- mechanical cycling about marginal misfit and screw loosening torque. Work models will be manufactured from prototyped models (n=15): 4 implants and respectively frameworks. Marginal misfit will be measured by single screw test protocol. The screws will be submitted to 10 Ncm torque through a digital torque meter and 10 minutes later initial loosening torque will be evaluated. Tension distribution will be evaluated by extensometry and photoelastic analysis. All frameworks will receive application of veneering material, and then marginal misfit and tension distribution will be evaluated. Frameworks with higher misfit will be submitted to spark erosion process (Ti cp. e Co-Cr). Screws will be retightened and new extensometry and photoelastics analysis will be done. Before and after mechanical cycling (106 mechanical cycles, 2Hz/130N), all specimens will have its marginal misfit levels and loosening torque measured. All data will be submitted to exploratory analysis and appropriated tests will be applied. (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)

BARBIN, THAIS; VELOSO, DANIELE VALENTE; SILVA, LETICIA DEL RIO; BORGES, GUILHERME ALMEIDA; CAMACHO PRESOTTO, ANNA GABRIELLA; RICARDO BARAO, VALENTIM ADELINO; MESQUITA, MARCELO FERRAZ. 3D metal printing in dentistry: An in vitro biomechanical comparative study of two additive manufacturing technologies for full-arch implant-supported prostheses. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 108, AUG 2020. (17/16303-3, 17/15297-0)

BARBIN, THAIS; SILVA, LETICIA DEL RIO; VELOSO, DANIELE VALENTE; BORGES, GUILHERME ALMEIDA; CAMACHO PRESOTTO, ANNA GABRIELLA; RICARDO BARAO, VALENTIM ADELINO; GROPPO, FRANCISCO CARLOS; MESQUITA, MARCELO FERRAZ. Biomechanical behavior of CAD/CAM cobalt-chromium and zirconia full-arch fixed prostheses. JOURNAL OF ADVANCED PROSTHODONTICS, v. 12, n. 6, p. 329-337, DEC 2020. (17/16303-3, 17/15297-0)