Dentin biomodification with phosphorylated chitosan nanoparticles (NanoPC) after selective removal of caries lesion by Er: YAG laser: Evaluation of antimicrobial and physicochemical properties

• Grant number: 17/11582-1
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Effective date (Start): March 01, 2018
• Effective date (End): June 30, 2022
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Silmara Aparecida Milori Corona
• Grantee: Fabiana Almeida Curylofo Zotti
• Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Associated scholarship(s): 19/04807-2 - Functions of proanthocyanidins as nucleators of dentin biomineralization, BE.EP.PD

Abstract

In the face of the benefits of selective caries removal using Er:YAG laser and attempting to stabilize the dentin collagen structure to improve the mechanical integrity of caries-affected dentin, it is relevant to evaluate in vitro the effect of the selective removal of caries lesion using Er:YAG laser and the dentin biomodification with an experimental compound of phosphorylated chitosan nanoparticle (NanoPC). It will be evaluated the: dentin microbiology, chemical composition of the dentin, micro hardness of the dentin subsurface, micro-shear bond strength and the morphology of the adhesive interface after 24 h and 18 months of hydrolytic degradation. The sample will be composed of 224 human third molars submitted a microbiological method to produce dentine caries lesions. Selective removal of the caries lesion will be performed using the Er:YAG laser (250mJ/4Hz) or but at low-speed handpiece (conventional method). The teeth will be divided according to the dentin biomodification: without biomodification (control) or NanoPC for 1 min. Specimens will be submitted to microbiological evaluation by counting of colony forming units of Streptococcus mutans (n=10), microhardness analysis of dentin subsurface at different depths (30, 60, 90 and 120 ¼m from the surface) (n=10) and analysis of the absorption peaks of the phosphate groups, carbonate, organic matrix bands and water (n=10) by FTIR. All analyzes will be performed after induction of the caries lesion, after the selective removal of the caries lesion and after the dentin biomodification. For bond strength analysis, the specimens will receive adhesive system (Single Bond Universal-3M) and composite resin (Z250-3M), and will be submitted hydrolytic aging for 24 h or 18 months. Afterwards, specimens will be submitted to micro-shear bond strength analysis (n=10) and morphological analysis of adhesive interface by MEV (n=3). The selection of statistical tests will be based on the characteristics of the data set for each variable. The statistical inferences will be made considering the significance level of 5%.

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)

RENATO GONÇALVES DOS REIS; ANTÔNIO CLÁUDIO TEDESCO; FABIANA ALMEIDA CURYLOFO-ZOTTI; THIAGO VINICIUS CORTEZ; HIAGO SALGE BORGES; ALINE EVANGELISTA SOUZA-GABRIEL; SILMARA APARECIDA MILORI CORONA. Longitudinal analyses of composite resin restoration on erosive lesions: effect of dentin treatment with a chitosan nanoformulation containing green tea. Braz. J. Oral Sci., v. 22, 2023-01-06. (19/04807-2, 17/11582-1)

DE SOUZA, JOSE CAETANO; TEDESCO, ANTONIO CLAUDIO; UNTEN TAKAHASHI, LUANDRA APARECIDA; CURYLOFO-ZOTTI, FABIANA ALMEIDA; SOUZA-GABRIEL, ALINE EVANGELISTA; MILORI CORONA, SILMARA APARECIDA. Influence of nanoparticulated chitosan on the biomodification of eroded dentin: clinical and photographic longitudinal analysis of restorations. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, v. 32, n. 1, JAN 20 2021. (17/11582-1, 17/25757-8)