The influence of composite resins fluorescence intensity on the retreatment of direct veneers using different removal methods

• Grant number: 21/14914-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2022
• End date: December 31, 2023
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Ticiane Cestari Fagundes
• Grantee: Giovana Maria Zeine dos Santos
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

During direct veneer retreatment, the clinician finds it difficult to remove all the restorative material without unnecessary wear to the healthy dental structure, especially in the cervical third, where the enamel thickness is smaller. Thus, the aim of this study will be to evaluate the influence of composite resin's fluorescence intensity on tooth wear and/or the presence of restorative material in different thirds in the preparation of direct veneers. Sixty bovine incisors corresponding to A3 shade will be selected, and the dimensions of their crowns will be reduced to 10 x 8 mm. All specimens will receive the initial scan (T0). Then they will receive the direct veneer preparation, will be scanned again (T1), and distributed into 18 groups, according to the composite resin (high, médium, and low fluorescence intensity), the removal method used (conventional high speed and high speed with ultraviolet light) and the dental thirds (cervical, middle and incisal). The veneers will be made with a universal adhesive system and the composite resins already mentioned. The re-preparation will be carried out by another operator, according to the established removal methods. Then, the specimens will receive a new scan (T2), and the volumetric change between T2 and T1, as well as the areas of tooth wear and/or presence of composite resin residues, will be measured and evaluated by thirds using the Geomagic Control X software. A tolerance of 0.025 mm will be established for the overlap in the software. The data will be submitted to the statistical test of normality and homogeneity. If the results pass the tests, the dimensional change data between T2 and T1 will be analyzed using parametric tests, namely: three-way ANOVA and Tukey's post-test. All analyzes will be performed with a significance level of 5%.(AU)