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Radiopacity evaluation of commercial and experimental infiltrants with barium and ytterbium oxide addition and its influence on physical properties

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Author(s):
Priscila Regis Matos Pedreira
Total Authors: 1
Document type: Doctoral Thesis
Press: Piracicaba, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
Defense date:
Examining board members:
Giselle Maria Marchi; Laura Nobre Ferraz; Luís Roberto Marcondes Martins; Diogo Dressano; Renata Pereira
Advisor: Giselle Maria Marchi
Abstract

The aim of this study was to evaluate the influence of adding different concentrations of ytterbium oxide and barium oxide with ytterbium oxide particles to a commercially available infiltrant (Icon®, DMG, Germany) and experimental infiltrants through tests of digital radiography, microradiography, microtomography, degree of conversion, sorption and solubility, contact angle, flexural strength, elasticity modulus and energy dispersive X-ray spectroscopy. The groups were divided according to the addition of ytterbium oxide particle alone (30 or 40%) or ytterbium oxide with barium (15/15% or 20/20% respectively) in the commercial infiltrant and in the experimental infiltrant. To evaluate radiopacity (n=5) the digital radiography system was used. For microtomography (n=3) and microradiography (n=5) analysis human molar enamel blocks were used, which were submitted to simulation of artificial initial carious lesion in demineralizing/remineralizing solutions. Subsequently, the blocks were infiltrated by the materials and submitted to penetration analysis (n=3) through microtomography test in the SkyScan µ-CT scanner. For microradiography these same samples were scanned by an image analysis system that is connected to a universal microscope. In order to evaluate the degree of conversion (n=5), measurements before and after light-curing of the samples were performed in a Fourier transform infrared spectrometer (FTIR). For sorption and solubility tests (n=16), after dissection, the cured samples were weighed, stored in distilled water for 7 days and reweighed, after further drying, until final mass was obtained. The test to evaluate the contact angle (n=16) was performed using a goniometer. To evaluate flexural strength and elasticity modulus (n=16) a universal testing machine was used. For energy dispersive X-rays (n=10) an EDX Link Analytical equipment coupled to a Zeiss scanning electron microscope was used. All statistical analyses were performed using the R program resources with a 5% significance level and image analyses were done qualitatively. Groups with the addition of 30 and 40% Ytterbium obtained higher or equal radiopacity to enamel by digital radiography. The radiopacity could not be measured by microradiography and microtomography. All groups with commercial infiltrant showed lower degree of conversion than with the experimental. The addition of 40% ytterbium favored the degree of conversion. High sorption values were found for all groups. When 30 and 40% ytterbium were added the solubility remained within the ISO recommendations. The contact angle increased proportionally to the amount of added particles. When particles were added in the groups with the experimental the flexural strength and elasticity modulus were increased. The addition of 40% ytterbium improved curing, had low solubility and higher radiopacity than dental enamel, but increased the contact angle of the infiltrants (AU)

FAPESP's process: 19/13029-3 - Radiopacity evaluation of commercial and experimental infiltrants with Bismute and ytterbium oxide addition and its influence on physical-chemical properties
Grantee:Priscila Regis Matos Pedreira
Support Opportunities: Scholarships in Brazil - Doctorate