Influence of 2-hydroxyethyl methacrylate concentration on polymer network of adhesive resin.
Fabrício Mezzomo Collares,Fabrício Aulo Ogliari,Cesar Henrique Zanchi,Cesar Liberato Petzhold,Evandro Piva,Susana Maria Werner Samuel +5 more
TLDR
Higher HEMA content increases dental adhesive resin degradation and the degree of conversion, polymerization rate, ultimate tensile strength, water sorption, and solubility of the adhesive resin blends were determined.Abstract:
PURPOSE To evaluate the effect of variations in 2-hydroxyethyl methacrylate (HEMA) concentrations in an experimental comonomer blend on degree of conversion, water sorption, solubility, and ultimate tensile strength of adhesive resin. MATERIALS AND METHODS The effect of HEMA content (0, 15, 30, and 50%wt - control, G15, G30, and G50 groups, respectively) was tested in an experimental comonomer blend of bis-GMA, bis-EMA, TEG-DMA, and HEMA. The degree of conversion, polymerization rate, ultimate tensile strength, water sorption, and solubility of the adhesive resin blends were determined. RESULTS At 40 s of light activation time, groups G30 and G50 showed a decrease of 30% and 61%, respectively, in degree of conversion compared to control. Water sorption and solubility differed for all groups, and was statistically higher in G50. For ultimate tensile strength, the control and G15 groups showed statistically higher values than the other groups (p < 0.05). CONCLUSION Higher HEMA content increases dental adhesive resin degradation.read more
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The addition of nanostructured hydroxyapatite to an experimental adhesive resin
Vicente Castelo Branco Leitune,Fabrício Mezzomo Collares,Rafael Mello Trommer,Daniela Guerra Andrioli,C.P. Bergmann,Susana Maria Werner Samuel +5 more
TL;DR: The incorporation of nanostructured hydroxyapatite increases the adhesive properties and may be a promising filler for adhesive resin.
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Niobium pentoxide as a novel filler for dental adhesive resin.
Vicente Castelo Branco Leitune,Fabrício Mezzomo Collares,Antonio Shigueaki Takimi,Ginia Brito de Lima,Cesar Liberato Petzhold,Carlos Perez Bergmann,Susana Maria Werner Samuel +6 more
TL;DR: Microhardness and radiopacity increased with higher amounts of Nb(2)O(5), and the particles were able to penetrate into the hybrid layers and may be an alternative for polymer-based biomaterials.
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Discrepancies in degree of conversion measurements by FTIR
Fabrício Mezzomo Collares,Fernando Freitas Portella,Vicente Castelo Branco Leitune,Susana Maria Werner Samuel +3 more
TL;DR: The internal standard peaks and measurement baseline should be taken into account when using FTIR to calculate the measured degree of conversion (DC) of methacrylate-based resins, especially comonomer blends containing a high degree of monomers that lack aromatic rings.
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Effect of silver nanoparticles on the physicochemical and antimicrobial properties of an orthodontic adhesive
Felipe Weidenbach Degrazia,Vicente Castelo Branco Leitune,Isadora Martini Garcia,Rodrigo Alex Arthur,Susana Maria Werner Samuel,Fabrício Mezzomo Collares +5 more
TL;DR: The addition of AgNP solutions to Transbond™ XT adhesive primer inhibited S. mutans growth and physicochemical and antimicrobial properties without compromising the chemical and physical properties of the adhesive.
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Chemistry of novel and contemporary resin-based dental adhesives.
Diogo Dressano,Marcos V. Salvador,Marcelo Tavares de Oliveira,Giselle Maria Marchi,Bruna Marin Fronza,Mohammed A. Hadis,William M. Palin,Adriano Fonseca Lima +7 more
TL;DR: The aim of this article is to review the current state-of-the-art of dental adhesives, and their chemical composition and characteristics that influences the polymerisation reaction and subsequent materials properties and performance.