Influence of surface treatment and thermal cycling associated with immersion in acid solutions and/or dyes on the optical characteristics of ceramics with resin matrix

• Grant number: 23/00807-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2023
• End date: February 29, 2024
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Aldiéris Alves Pesqueira
• Grantee: Thiago Scudeler Foltran
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

The present project will aim to evaluate the color change of 03 resin-matrix ceramics for CAD/CAM, a resin nanoceramics (Cerasmart - GC), a glass ceramic in a resin interpenetrating matrix (VITA Enamic - VITA) and other zirconia-silica ceramic in a resin interpenetrating matrix (Shofu Block HC - SHOFU), after different polishing protocols (Ceramisté polishing kit (Shofu) or surface sealant (Palaseal - kulzer) associated or not with PECVD film deposition (plasma-enhanced chemical vapor deposition), after thermocycling associated with immersion in acid/dye solutions. 120 square specimens with dimensions of 5x5x1.5 mm of each ceramic will be made. The specimens will be divided into groups according to the surface treatment and aging they will undergo. The polishes performed will be: 1) Mechanical Polishing (MP) - that the mechanical polishing will be carried out with the Ceramisté kit (SHOFU, Kyoto, Japan); 2) Palaseal surface sealant (SP) - a thin layer of Palaseal sealant will be applied (Heraeus Kulzer); 3) Mechanical Polishing (MP) + PECVD film deposition (Mp+ PECVD) - after MP, the surfaces of specimens in this group will be treated by deposition of PECVD films (plasma-enhanced chemical vapor deposition) and 4) Palaseal surface sealant (SP) + film deposition by PECVD (SP+ PECDVD). The in vitro aging procedures will be: Thermocycling (T): to 30,000 thermocycling cycles varying the temperature between 5 and 55oC for 30 seconds followed by immersion in dye solution (I): immersion in three solutions - distilled water (IDW), black tea (IBT) and red wine (IRW) for 36 days. The response variables of the study will be: color change (DE00, DL, DC, DH). The data obtained will be submitted to the test of adherence to the normal curve, appropriate statistical test being applied to compare mean values of the samples.