scholarly journals Effect of whitening dentifrices containing optical agent on the variation of color, roughness and mass of a nanoparticulate composite resin

2020 ◽  
Vol 49 ◽  
Author(s):  
Rafaela Silva OLIVEIRA ◽  
Hannah Barros SIMÕES ◽  
Natália Nascimento ODILON ◽  
Max José Pimenta LIMA ◽  
Elisângela de Jesus CAMPOS
Keyword(s):  
Composite Resin ◽  
Distilled Water ◽  
Whitening Effect ◽  
Electric Toothbrush ◽  
Loss Of Mass

Abstract Introduction Blue covarine is a pigment that promotes optical changes in dental surfaces, providing whitening. Objective To evaluate in vitro the effect of bleaching dentifrices containing Blue covarine in nanoparticulate composite resin subjected to artificial darkening. Material and method One hundred sixty (160) specimens (PBs) of FILTEK Z350XT nanoparticulate composite resin were randomly divided into two experiments: Experiment I - 8 groups (n=10) submitted to brushing with an electric toothbrush for 1 month; Experiment II - 8 groups (n=10) submitted to simulated brushing for 6, 12 and 24 months. Groups were distributed according to the solution/dentifrice tested: CG (distilled water) and 7 test groups (GT1- Coltene Herjos, GT2- Colgate Total 12 Clean Mint, GT3- Colgate Luminous White Brilliant Mint, GT4- Oral B 3D White Perfection, GT5- Close Up White Now Glacier Fresh, GT6- Close Up White Attraction Diamond and GT7- Sorriso Xtreme White Evolution). Result In Experiment I, there was greater ∆E in GT6 in relation to CG, GT2, GT4 and GT5, with no differences among them. In Experiment II, after 24 months of brushing, there was greater ∆E in groups GT6 and GT7. After 24 months of simulated brushing, there was no change in roughness or loss of mass in any group. Conclusion The whitening effect promoted by dentifrices containing the agent Blue covarine seems to be related to the association of this agent with the abrasives present in the formulations of whitening dentifrices.

scholarly journals Effect of Energy Drinks on the Inorganic Composition of a Composite Resin Material

2020 ◽  
pp. 1-5
Author(s):  
Danielson Guedes Pontes ◽  
Lara Pepita de Souza Oliveira ◽  
Diego Ferreira Regalado ◽  
Danielson Guedes Pontes ◽  
Cláudia Cândida Silva ◽  
...  
Keyword(s):  
Immersion Time ◽  
Composite Resin ◽  
In Vitro Study ◽  
Energy Drinks ◽  
Composite Resins ◽  
Distilled Water ◽  
Water Control ◽  
Inorganic Composition ◽  
The Individual

Composite resins are used in Dentistry to perform direct aesthetic restorations, and are a material whose properties can be influenced by the diet of the individual, especially in the face of the action of beverages with acid pH, such as energy drinks. The aim of this in vitro study was to evaluate the effect of two energy beverages on the chemical composition of a nanoparticulate composite resin, at two-time intervals. Filtek Z350XT (3M/ESPE) composite resin was used to produce thirty-six specimens (discs) of 6.0mm x 1.5mm dimensions. The specimens were initially immersed in distilled water for 24h at 37ºC and then randomly divided into two groups (n=18); according to the immersion time: 1 month (T1) and 3 months (T2); and in three subgroups (n=6) referring to immersion solutions: distilled water (control) and two energy beverages (RedBull and Monster). The inorganic composition of the specimens was measured by a spectrometry. The data were submitted to two-way ANOVA and Tukey tests. The main inorganic elements of this restorative material were respectively: zirconium (Zr), silicon (Si) and calcium (Ca), which reduced its percentage after immersion time. RedBull was the most active solution, promoting losses of the mineral Si after 1 month of immersion, of Zr, after 3 months, and of Ca after 1 month and after 3 months. Monster influenced losses only in Si, after 1 month. Distilled water did not induce significant losses. Thus, the two energy beverages reduced the inorganic percentage of the nanoparticulate composite resin evaluated in this research.

Comparative Evaluation of Solubilities of Two Nanohybrid Composite Resins in Saliva Substitute and Distilled Water: An in vitro Study

2017 ◽  
Vol 7 (2) ◽  
pp. 82-85 ◽  
Author(s):  
Pranjal S Walzade ◽  
Sumanthini MV ◽  
Vanitha U Shenoy ◽  
Rohini P Mahajan
Keyword(s):  
Comparative Evaluation ◽  
Composite Resin ◽  
Composite Resins ◽  
Long Term Results ◽  
P Value ◽  
Distilled Water ◽  
Saliva Substitute ◽  
Significant Difference ◽  
Nanohybrid Composite

ABSTRACT Aim of the study To determine the solubility of nanohybrid (NH) composite resins when immersed in saliva substitute and distilled water. Materials and methods A total of 60 disc-shaped samples (n = 30) were prepared in teflon molds of diameter 10 mm × 2 mm thickness from two NH composite resins. They were light-cured following which the samples were removed and weighed three times using a digital balance. Samples were then immersed in test solutions, i.e., 100 mL of distilled water and saliva substitute each stored for 24 hours and 7, 14, 21, and 28 days in an incubator at 37°C at 100% humidity. At the time intervals mentioned, the samples were removed from the incubator, washed with distilled water, blotted dry, and weighed. Samples were again immersed in fresh test solutions. Difference in preweight and postweight of samples was calculated and data were analyzed using appropriate test by testing normality. A p-value < 0.05 was considered to be significant. Results The results were analyzed using one-way analysis of variance (ANOVA). As observed from the baseline weight to the 28th day weight, there was a loss of weight of the samples in all the groups except NH composite resin (Flash) in distilled water. Conclusion From the results of the study, it was observed that there was no statistically significant difference in weight, with respect to the solubility of the two NH composite resins and the two solutions tested. Clinical significance of the study is that the NH composite resin that shows lesser solubility can be the choice for an esthetic restorative material in patients for long-term results. How to cite this article Mahajan RP, Shenoy VU, Sumanthini MV, Walzade PS. Comparative Evaluation of Solubilities of Two Nanohybrid Composite Resins in Saliva Substitute and Distilled Water: An in vitro Study. J Contemp Dent 2017;7(2):82-85.

scholarly journals Effect of bleaching protocols on surface roughness and color change of high- and low-viscosity bulk-fill composite resins.

2020 ◽  
Vol 33 (2) ◽  
pp. 59-68
Author(s):  
Bruna Tavares ◽  
Fabiana França ◽  
Roberta Basting ◽  
Basting Turssi ◽  
Turssi Amaral
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Color Change ◽  
In Vitro Study ◽  
High Viscosity ◽  
Composite Resins ◽  
Distilled Water ◽  
Water Control ◽  
Low Viscosity

The aim of this in vitro study was to evaluate the effect of bleaching protocols on the surface roughness (Ra), color change and surface micromorphology of a low-viscosity bulk-fill composite (Filtek Bulk Fill Flow, 3M ESPE), a highviscosity bulk-fill composite (Filtek Bulk Fill, 3M ESPE) and a conventional nanoparticulate composite resin (control) (Filtek Z350 XT, 3M ESPE). Forty samples of each composite (disks 5 mm in diameter and 2 mm thick) were randomly divided into four groups (n=10), according to bleaching protocol: a) 10% carbamide peroxide gel (Opalescence, Ultradent Products) (2 h/ day, for 14 days); b) 40% hydrogen peroxide gel (Opalescence Boost, Ultradent Products) (three bleaching sessions, once a week, 45 min/session); c) whitening rinse (Listerine Whitening Extreme, Johnson & Johnson) (2 min/day, for 14 days); and d) distilled water (control). The samples were submitted to triplicate readings (Ra and color [CIELAB parameters]) before and after contact with bleaching protocols. Micromorphology was analyzed in a scanning electron microscope (SEM). Ra and color parameters (ΔL, Δa, Δb and ΔE) were analyzed by generalized linear models (α=0.05). The Ra of the high-viscosity bulk-fill was significantly higher than that of the other composites (p<0.05). Ra increased significantly (p<0.05) and surface became more irregular (SEM analysis) in all the composite resins, regardless of the bleaching protocol (p<0.05). The high-viscosity bulk-fill composite resin group had significantly lower ΔE (p<0.05) than the nanoparticulate composite resin group immersed in distilled water. It was concluded that the characteristics of each resin significantly influenced the Ra more than the bleaching protocol. The high-viscosity bulk-fill resin presented minor color change.

scholarly journals Determination of the Whitening Effect of Toothpastes on Human Teeth

2021 ◽  
pp. 322-330
Author(s):  
Numan Aydın ◽  
Serpil Karaoğlanoğlu ◽  
Elif Aybala Oktay ◽  
Bilge Ersöz
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Charcoal ◽  
Single Point ◽  
In Vitro Study ◽  
Human Teeth ◽  
Whitening Effect ◽  
Significant Difference ◽  
Electric Toothbrush ◽  
Jaw Model

Objective: The desire of individuals to have whiter teeth increases the interest in tooth whitening products. Our aim was to in vitro study the whitening effect of hydrogen peroxide, blue covarine and active charcoal containing whitening toothpastes on human teeth. Materials and Methods: A total of 40 extracted human incisor teeth were used in the study. To measure the whitening effect of toothpastes, the teeth were divided into four subgroups and placed in the phantom tooth jaw model. Then, daily brushing was done with an electric toothbrush. The colors of the teeth were measured initially using the spectrophotometer (single point and bleached shade mode) and at the end of 7th, 14th and 28th days. Whitening effectiveness of toothpastes were studied according to CIEDE2000 formula (∆E00) and shade guide units (SGU). One-way analysis of variance (ANOVA) and Tukey test were used in the statistical analysis of the data. (p<0.05). Results: Activated charcoal containing toothpaste showed the greatest whitening effect at the end of 7th, 14th and 28th days (p<0.05). There was no statistically significant difference between the whitening effects of hydrogen peroxide and conventional toothpaste (p>0.05). Blue covarine containing toothpaste had statistically the lowest whitening effect (p<0.05). Conclusions: All toothpastes showed a whitening effect on the teeth after 7 days of use. Activated charcoal containing toothpaste showed more whitening effect after 28 days of use than hydrogen peroxide, blue covarine and traditional toothpaste.

scholarly journals Avaliação da Resistência de União Entre Resina Composta e Substrato Dentinário Exposto à Quitosana

2017 ◽  
Vol 19 (3) ◽  
pp. 191
Author(s):  
Sarah Cavalcante De Barros ◽  
Heloise Caroline Vieira ◽  
Maura Cristiane Gonçalves Orçati Dorilêo ◽  
Murilo Baena Lopes ◽  
Sandrine Bittencourt Berger ◽  
...  
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Adhesive System ◽  
Smear Layer ◽  
Test Machine ◽  
Distilled Water ◽  
Significance Level ◽  
Layer Removal ◽  
The Matrix

Em endodontia, indicam-se substâncias quelantes para a remoção da lama dentinária. O objetivo deste estudo foi avaliar, in vitro, por meio do microcisalhamento, a resistência de união da resina composta com superfícies dentinárias tratadas com EDTA (17%) e quitosana (0,2%). De 30 coroas de dentes bovinos foram removidas as paredes palatina, mesial e distal, expondo a superfície dentinária da parede vestibular da câmara coronária, que abrasionada produziu a camada de esfregaço. Após, a superfície foi tratada, estabelecendo-se 3 grupos (n=10): G1 (controle) com aplicação de água destilada (1min); G2 com aplicação de EDTA (3 min.), e lavagem com água destilada (1 min.); e G3 com aplicação de quitosana (3 min.), lavagem com água destilada (1 min.). Na sequência foram aplicados 2 ml de NaOCl (2,5%), 2 ml de água destilada (1 min), armazenando-as em água destilada (37 °C). Retiradas da água destilada (24 h), fixaram –se 3 tubos Tygon (1mmX1mm) na dentina após o condicionamento local com sistema adesivo convencional de 2 passos. Preenchidos com resina composta e após fotoativação, os tubos foram removidos obtendo-se cilindros que foram submetidos ao microcisalhamento em máquina de ensaio universal. Os resultados de resistência de união (MPa) foram submetidos a Análise de Variância e Tukey, com nível de significância 5%. Observou-se que a resistência de união de G2 e G3 foram equivalentes estatisticamente (p>0,05), porém significativamente maiores que em G1 (p<0,05). Conclui-se que quitosana e EDTA promovem resistência de união semelhante nas condições testadas.Palavras-chave: Camada de Esfregaço. Dentina. Endodontia.AbstractIn endodontics, chelating substances are indicated for smear layer removal. This study evaluated, by micro-shear, the bond strength between composite resin and dentin surfaces treated with EDTA (17%) and chitosan (0.2%). The palatal, mesial and distal walls were removed from 30 crowns of bovine teeth, to expose buccal dentin of coronary chamber, whose abrasion produced the smear layer. The surface was treated, considering 3 groups (n = 10): G1 (control) distilled water (1min); G2 EDTA application (3 min), and distilled water (1 min); and G3 chitosan application (3 min.), distilled water (1 min.). All groups received 2 ml of NaOCl (2.5%), 2 ml of distilled water (1 min), and then stored in distilled water (37 °C). After that (24 h), 3 Tygon matrix (1 mmX1 mm) were fixed to the dentin after surface storing them with a two-step adhesive system. Then, the matrixes were filled with composite resin, and once photoactivated, the matrix were removed resulting in cylinders that were submitted to micro-shear bond test in universal test machine. The results (MPa) were submitted to ANOVA and Tukey, with significance level of 5%. It was observed that G2 and G3 bond strength were statistically equivalent (p> 0.05), but significantly higher than G1 (p <0.05). It is concluded that chitosan and EDTA resulted in similar bond strength under the conditions tested.Keywords: Smear Layer. Dentin. Endodontics.

scholarly journals Influência da polimerização adicional na microdureza de compósitos diretos para uso indireto: estudo in vitro

2020 ◽  
Vol 42 ◽  
pp. e35
Author(s):  
Carlos Henrique Camilo Marcehsan ◽  
Angela Isabel dos Santos Dullius ◽  
Angela Pellegrin Ansuj ◽  
Vinícius Pinheiro Nunes ◽  
Gislaine Rosa Biachi
Keyword(s):  
Analysis Of Variance ◽  
Composite Resin ◽  
The Other ◽  
Distilled Water ◽  
Led Light ◽  
Post Hoc

The aim of this study was to verify the effect of additional polymerization with microwave and autoclave on the microhardness of 3 different commercial brands of composite resin compared to the ceromere. Cylindrical specimens (6mm x 3mm) were made with a split matrix divided into 10 groups of 13 bodies, with: Photoactivation (LED light on the top surface-40s; photoactivation LED + microwave (500W per 3min) immersed in 100ml distilled water and Photoactivation LED + autoclave (full cycle). The Ceromere group was activated according to the manufacturer's recommendation. The specimens went through a finishing and polishing sequence being stored with a cotton moistened in distilled water for 24h. They were taken to the microhardness meter (three dentations, 50g/15s load). The analysis of variance (ANOVA) was performed with post hoc Games Howell at a level of 5%. It was verified that the ceromere did not differ from the groups Z250 photo and microwave, but was inferior to the Z250 group with autoclave, and the microhardness of this was higher than the other groups. The Tetric group was inferior to all other groups. It was concluded that the additional polymerization methods promoted an increase of the superficial microhardness of the Z250 resin and this did not present a difference of microhardness when compared to the Ceromere

scholarly journals PENGARUH WAKTU POLISHING DAN ASAM SITRAT TERHADAP MICROLEAKAGE PADA TUMPATAN RESIN KOMPOSIT NANOFILLER AKTIVASI LIGHT EMITING DIODE - In Vitro

2015 ◽  
Vol 1 (1) ◽  
pp. 11
Author(s):  
Dhurohmah . ◽  
Rochman Mujayanto ◽  
Siti Chumaeroh
Keyword(s):  
Citric Acid ◽  
Composite Resin ◽  
Distilled Water ◽  
Test Results ◽  
Class V ◽  
Group I ◽  
Significant Difference ◽  
Composite Resin Restoration ◽  
The Difference

Background: The objective of this research is to investigate influence of polishing time and citric acid on microleakage in nanofiller composite resin restoration (Z350XT,3M). Method: The research was conducted on a class V restoration amount sample 24 on bovine teeth. The first group restoration was polished immediately after curing then was soaked in distilled water. The second group was polished immediately after curing and then was soaked in citric acid.The third group was polished after 24 hours of curing and then was soaked in distilled water. The fourth group was polished after 24 hours of curing then was soaked in citric acid. Samples were immersed for 7 days and then were soaked in methylene blue for 1 day and were split longitudinally and were observed using microskopstereo and were measured using calipers. Result: Data were analized by Kruskal-wallis with the result of p > 0,05, there is a significant difference in group I, II, III, and IV. Mann- Whitney test results the difference between the data. Conclusion: The conclution is there were significant differences between the groups which immersed with citric acid of distilled water and there is no significant difference between groups which polished immediately and polished 24 hours later.

SEM Evaluation of Fluoride Pretreatment Effects on Acid-Etching of Caries-Like Enamel Lesions In Vitro

1981 ◽  
Vol 39 ◽  
pp. 474-475
Author(s):  
M. John Hicks
Keyword(s):  
Dental Enamel ◽  
Preventive Measure ◽  
Acid Etching ◽  
Distilled Water ◽  
Adhesive Resin ◽  
Fluoride Treatment ◽  
Treatment Groups ◽  
Pretreatment Effects ◽  
Preparation Techniques

Acid-etching of enamel surfaces has been performed routinely to bond adhesive resin materials to sound dental enamel as a caries-preventive measure. The effect of fluoride pretreatment on acid-etching of enamel has been reported to produce inconsistent and unsatisfactory etching patterns. The failure to obtain an adequate etch has been postulated to be due to fluoride precipitation products deposited on the enamel surface. The purpose of this study was to evaluate the effects of fluoride pretreatment on acid-etching of carieslike lesions of human dental enamel.Caries-like lesions of enamel were created in vitro on human molar and premolar teeth. The teeth were divided into two fluoride treatment groups. The specimens were exposed for 4 minutes to either a 2% Sodium Fluoride (NaF) solution or a 10% Stannous Fluoride (SnF2) solution. The specimens were then washed in deionized-distilled water. Each tooth was sectioned into four test regions. This was carried out to compare the effects of various time exposures (0 to 2 minutes) and differing concentrations (10 to 60% w/w) of phosphoric acid (H3PO4) on etching of caries-like lesions. Standard preparation techniques for SEM were performed on the specimens.

EFFECT OF PREHEATING ON MICROLEAKAGE AND MICROHARDNESS OF COMPOSITE RESIN (AN IN VITRO STUDY)

2016 ◽  
Vol 41 (1) ◽  
pp. 4-11
Author(s):  
Soliman Eman M ◽  
Elgayar Ibrahim L ◽  
Kamar A Adel A
Keyword(s):  
Composite Resin ◽  
In Vitro Study ◽  
Vitro Study
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