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2 results on '"Giovanni Bernardo Sichi, Luigi"'

1. Phenotypic Features and Salivary Parameters in Patients with Ectodermal Dysplasia: Report of Three Cases

Author

Fernandes Gomes, Mônica, Giovanni Bernardo Sichi, Luigi, Chrystiane Giannasi, Lilian, Benedito Oliveira Amorim, José, Carlos da Rocha, João, Yumi Koga-Ito, Cristiane, and Angel Castillo Salgado, Miguel

Abstract

Ectodermal dysplasia (ED) is a rare hereditary disorder affecting the development of ectoderm-derived organs and tissues. The aim of this study was to describe phenotypic features and the therapeutic approach in dentistry among three patients with ED, correlating their data with the literature. Additionally, to investigate the salivary gland disorders and their impacts on oral microbiota, we performed salivary tests, including salivary flow rate, salivary buffering capacity, and concentration levels of mutans streptococci, lactobacilli, and yeasts. All patients presented oligodontia, resulting in a significant masticatory dysfunction and aesthetic impairment. The counts of mutans streptococci n=3 and yeasts n=2 were high; on the other hand, the count of lactobacilli n=3 was low. Therefore, salivary and microbiological tests showed that the patients with ED, particularly the hypohidrotic type, presented a high risk of enamel caries and susceptibility to oral infections, which may be likely triggered by reduction of salivary flow and/or possible immunological disorders.

Published
2018
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2. Effect of Biologically Oriented Preparation Technique on the Stress Concentration of Endodontically Treated Upper Central Incisor Restored with Zirconia Crown: 3D-FEA

Author

Pietro Ausiello, João Paulo Mendes Tribst, Guilherme Schmitt de Andrade, Fernanda Zapater Pierre, Alessandro Espedito di Lauro, Alexandre Luiz Souto Borges, Laura Viviana Calvache Arcila, Luigi Giovanni Bernardo Sichi, Oral Regenerative Medicine (ORM), Giovanni Bernardo Sichi, Luigi, Zapater Pierre, Fernanda, Viviana Calvache Arcila, Laura, Schmitt de Andrade, Guilherme, Paulo Mendes Tribst, João, Ausiello, Pietro, DI LAURO, ALESSANDRO ESPEDITO, Luiz Souto Borges, Alexandre, Universidade Estadual Paulista (UNESP), Universidade Estadual do Oeste do Paraná (UNIOESTE), University of Taubaté (UNITAU), and University of Naples Federico II

Subjects
Ceramics, Materials science, Dental materials, medicine.medical_treatment, Pharmaceutical Science, Organic chemistry, finite element analysis, Composite Resins, Crown (dentistry), Analytical Chemistry, QD241-441, stomatognathic system, Tensile Strength, Drug Discovery, Ultimate tensile strength, medicine, Dentin, Humans, dental materials, Maxillary central incisor, Cubic zirconia, Physical and Theoretical Chemistry, Stress concentration, Orthodontics, Tooth, Nonvital, Enamel paint, Crowns, Communication, Finite element analysis, Ferrule, Dental restoration failure, Incisor, stomatognathic diseases, medicine.anatomical_structure, Chemistry (miscellaneous), visual_art, visual_art.visual_art_medium, Molecular Medicine, Glass, Stress, Mechanical, Zirconium, dental restoration failure
Abstract

Made available in DSpace on 2022-05-01T09:47:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-10-02 The aim of this study was to evaluate the effect of biologically oriented preparation technique on the stress concentration of endodontically treated upper central incisors restored with zirconia crown (yttria-stabilized zirconia polycrystalline ceramic) through finite element analysis (FEA). Four models of maxillary central incisors containing enamel, dentin, periodontal ligament, cortical and medullary bone were created in CAD. Each model received a polymeric core-build up with nanofilled dental resin composite. The evaluated models were SM—preparation in shoulder 90◦; CM—chamfer preparation; BOPT—biologically oriented preparation technique and BOPTB—BOPT preparation 1 mm below the cement-enamel junction. All models received zirconia crowns (5Y-TZP), fiberglass post and 1 mm ferrule. The models were imported into the analysis software with parameters for mechanical structural testing using the maximum principal stress and the tensile strength as the analysis criteria. Then, load of 150 N was applied at the cingulum with 45◦ slope to the long axis of the tooth, with the fixed base for each model. The type of marginal preparation affected the stresses concentration in endodontically treated teeth and in the zirconia crown margin. Considering the stress magnitude only, BOPT is a viable option for anterior monolithic zirconia crowns; however, with the highest stress magnitude at the restoration margin. Department of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University (Unesp) Faculty of Dentistry Universidade Estadual do Oeste do Paraná (UNIOESTE) Department of Dentistry University of Taubaté (UNITAU) School of Dentistry University of Naples Federico II, via S. Pansini 5 Department of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University (Unesp)

Published
2021
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