RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no toda... more RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dudas sobre su uso han sido explicadas, mucho menos los efectos adversos sobre la resistencia de unión de restauraciones adhesivas en esmalte/dentina, los cuales todavía siguen siendo muy controvertidos. Esta revisión de tema tiene como objetivo analizar conceptos sobre la interacción entre adhesión posaclaramiento y tratamientos para controlar esas interacciones. Con base en la literatura revisada se puede concluir que un tiempo de espera entre aclaramiento y procedimiento restaurativo debe ser por lo menos de 7 días para que todo el oxígeno residual remanente pueda ser liberado de la estructura dental y, en los casos que sea necesario hacer una restauración inmediata al proceso de aclaramiento, el uso de agente antioxidante como ascorbato de sodio 10% en la forma de gel es una alternativa viable para disminuir los efectos del aclaramiento en el procedimiento adhesivo.
Objective: To evaluate the influence of application methods and times ofself-etching adhesive sys... more Objective: To evaluate the influence of application methods and times ofself-etching adhesive systems on the micro-shear bond strength (SBS) and conditioning pattern of enamel. Methods: Human molars were divided into 12 groups according to the combination of the factors Adhesive (All Bond SE[ALB], Clearfil S3 Bond [CS3]and Clearfil SE Bond [CSE]), Application method (active [A]or passive [P]) and application time (20 or 40 s). Teeth were embedded in acrylic resin, ground until a flat enamel area was exposed and polished with 600-grit SiC paper. The self-etching adhesive systems were applied according to the factors under investigation (n=5). Five polyethylene cylinders were positioned over each sample, filled in with a composite resin and photoactivated for 40 s at 600 mW/cm2. After 24h, the cylinders were removed and submitted to SBS test at 1mm/min. The etching pattern produced by the materials under the experimental conditions was evaluated under scanning electron microscopy. Dat...
The aim of this study was to evaluate different conditioning protocols and sonic/ ultrasonic appl... more The aim of this study was to evaluate different conditioning protocols and sonic/ ultrasonic application of an infiltrant resin (IR) in artificial white spot lesions (AWSL). the V/L surfaces of 48 molars were induced to an AWSL and divided in 6 groups, according to the conditioning protocols and application technique: 15% hydrochloric acid (HA) + manual application of the IR; HA + 37% phosphoric acid (PA) + manual application of the IR; HA + ultrasonic application (U) of the IR; HA + sonic application (S) of the IR; PA+HA+S; and PA+HA+U. For the Penetration Depth (PD), the crowns were etched with HA for 120s. The IR Icon® (DMG) was applied according to the manufacturer`s instructions. The crowns were dye penetrated (0.1% red fluorophore rhodamine B isothiocyanate for 12h) and bleached with 30% hydrogen peroxide for 12 h. The discs were immersed in a 50% ethanol solution, containing 100 µM of sodium fluorescein. The PD (in µm) was measured using confocal laser scanning microscopy (20x). The bond strength (BS) was performed by michoshear test (0.5 mm/min). Data were submitted to 2-way ANOVA and Tukey (α=0.05). For BS, the interaction was not significant (p>0.05). For PD, the main factors were significant (application-p<0.001; conditioning technique-p=0.003). The ultrasonic application showed the highest PD values. PA+HA presented higher results than HA. The sonic/ultrasonic applications and the use of phosphoric acid prior to hydrochloric acid improved PD of the infiltrant resin. Conditioning protocols or application techniques did not influence BS values.
Conical implant–abutment connections are popular for their stability; however, in other condition... more Conical implant–abutment connections are popular for their stability; however, in other conditions, such as excessive force, implants and abutments can absorb all the stress. Some connections with three points of support can resist more than conical connections. In recent years, different studies has shown that the design of a connection affects its stability. The aim of this study was to analyze and compare the stresses in finite elements (FEs) in a newly proposed conical triangular connection in implants with hexagonal and conical connections. A nonlinear 3D FE parametric model was developed using SOLIDWORKS 2017®. All the connections, i.e., external and internal hexagons, morse taper, conical connection, and the new conical triangular proposal were compared when axial forces of 150, 250, and 350 N were applied to the occlusal. The maximum stress was found in the external hexagon. The maximum stress was concentrated at the level of the neck of the abutment, implant, and bone, exce...
Introduction: Dentin hypersensitivity is a common pathology, produced by exposed dental tubules. ... more Introduction: Dentin hypersensitivity is a common pathology, produced by exposed dental tubules. Objectives: The aim of this study was the evaluation of the effectiveness of experimental toothpaste based on nano-hydroxyapatite (nHAP) obtained from chicken eggshell in the obliteration of dentinal tubules (DTs). Material and methods: Toothpastes with different percentages of nHAP were formulated, including 3%, 7%, and 15% of nHAP, a commercial paste, and a toothpaste without nHAP. Assays were made using healthy premolar samples (n = 50). The pastes were applied and brushed for 7 days after a first erosive cycle, then a second erosive cycle was made at 15 days. Samples were analyzed using scanning electron microscopy and confocal Raman microscopy at three times: after the first erosive cycle (T0), after applications of the pastes (T7), and after the second erosive cycle (T15). Results: The quantitative analysis of the micrographs showed a significant difference between the experimental toothpastes with respect to the controls. Moreover, there was no statistically significant difference between the experimental toothpastes at time T7. By mineral concentration analysis, the 3%-nHAP toothpaste presented a significant difference against conventional toothpaste, when evaluating mineral concentration at 7 days. Conclusions: The experimental paste is effective in obliterating DTs at concentrations of 7 and 15%, in addition to being stable over time.
Objetivo. Evaluar la resistencia de union con doble aplicacion de SSA-Bond sobre dentina. Metodos... more Objetivo. Evaluar la resistencia de union con doble aplicacion de SSA-Bond sobre dentina. Metodos. Se utilizaron 10 dientes incisivos bovinos, los dientes fueron lijados hasta llegar a dentina con lija 600, y despues hasta 2000, dividiendolos aleatoriamente en dos grupos, GA, aplicacion de adhesivo segun el fabricante (n=5), GB aplicacion de adhesivos segun el fabricante con aplicacion de dos capas de de SSA-Bond (n=5), la aplicacion fue estandarizadas con una balanza analitica a una presion (4,0 ± 1,0g), cada grupo fue restaurado a una altura de 6 mm con Resina Filtek TM Silorano (P 90). Fue realizado cortes para conseguir palitos de resina/dentina con una area de 1 mm 2 , 10 mm de largo, y fue llevado a teste de microtraccion a una velocidad de 0,5 mm/min. Se analizaron los datos con ANOVA y test de TUKEY, Resultados. Se encontro una media (25,5 MPa), GB (13,4 MPa) p=0,05. Conclusiones. La doble aplicacion de SSA-Bond no mejora la resistencia union del adhesivo SSA
Objectives: evaluate the micro-shear bond strength in lithium disilicate ceramics with different ... more Objectives: evaluate the micro-shear bond strength in lithium disilicate ceramics with different manufacturing process treated with two one-step self-etching adhesives. Methods: For manufacturing the test specimens (4 groups, 5 specimens each) infiltrated and machined lithium disilicate ceramics discs were prepared (IPS Emax 2). The discs were placed in polyvinyl chloride (PVC) tubes, and two different adhesive systems were applied to the disc surfaces according to the experimental groups (Group MG: machined lithium disilicate + Gluma 2Bond, Group MB: machined lithium disilicate + and Bond2.0, Group IG: Infiltrated lithium disilicate + Gluma 2Bond, and group IB: infiltrated lithium disilicate + Bond2.0), immediately beams of Filtek Z350 Flow resin were constructed using tygons as molds over the ceramic discs. The micro-shear bond strength (MSBS) was tested using a universal testing machine with a crosshead speed set at 0.75 mm/min until failure occurred. The MSBS values were calculated in Megapascals. The data was analyzed with one-way ANOVA test and the level of significance was set at 5%. Results: The MSBS were different between all groups. MG group showed the highest values (26.48 ± 5.74), the difference was statistically significant from the other groups (p<0.05).
Objetivo: evaluar los efectos sobre la dureza superficial y la rugosidad de un gel clareador de p... more Objetivo: evaluar los efectos sobre la dureza superficial y la rugosidad de un gel clareador de peróxido de hidrógeno 35% con posterior cepillado. Materiales y métodos: se realizó un estudio experimental In vitro, fueron realizados cuarenta bloques de esmalte de 3mm 2 de terceros molares en la porción vestibular, fueron lijados con lijas de granulación 600-1500, para ser divididos en las dos metodologías: microdureza Vickers (n=20) y microscopia de fuerza atómica (n=20). Estos fueron divididos en dos grupos, GC y GCC. En el grupo GC (n=10) se realizó aclaramiento con peróxido de hidrógeno al 35% mientras que en el GCC, el aclaramiento se hizó con peróxido de hidrógeno al 35% y posterior a éste se realizó cepillado con una crema dental que contenía 1450 ppm de flúor. Se realizó un test de ANOVA, un post test t de Student con un nivel de significancia α≤0,05, para conocer las diferencias entre los grupos. Resultados: se encontró una diferencia estadísticamente significativa sobre el numero de microdureza vickers (NDV) en el grupo GCC (antes: 369,4 ± 19,4 NDV, después: 392,4 ± 14,2 NDV) pero no se observó ninguna diferencia estadísticamente significativa sobre la rugosidad (Ra), en ninguno de los dos grupos. Conclusión: el cepillado con crema dental con 1450 ppm de fluor, después del proceso de aclaramiento dental con peróxido de hidrógeno 35% mantiene la estabilidad de la dureza superficial del esmalte.
To examine the effect of the alternative coinitiator 4,4'bis dimethylamino benzydrol (BZN) in... more To examine the effect of the alternative coinitiator 4,4'bis dimethylamino benzydrol (BZN) in degree of conversion (DC), mechanical and biological properties of experimental composites. The coinitiator BZN was used in three concentrations (0.2, 0.5 and 1.2%), and the coinitiator DMAEMA was used as control at the same concentrations as above. The molar concentration of camphorquinone (CQ) and coinitiators was kept constant (1:1). The composites were manipulated and submitted to microhardness test (VHN), flexural and compressive strength (in MPa), elastic modulus (GPa), DC (FT-IR) and in vitro cytotoxicity (against 3T3 fibroblastic cells) of the experimental resins. Data were subjected to two-way ANOVA and Tukey post-test (α=0.05). The experimental composite resin with BZN showed higher DC values compared to control DMAEMA groups. For the mechanical properties, microhardness values were higher in BZN groups; flexural strength and elastic modulus were similar between all the groups...
Revista Facultad De Odontologia Universidad De Antioquia, Jun 28, 2013
RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no toda... more RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dudas sobre su uso han sido explicadas, mucho menos los efectos adversos sobre la resistencia de unión de restauraciones adhesivas en esmalte/dentina, los cuales todavía siguen siendo muy controvertidos. Esta revisión de tema tiene como objetivo analizar conceptos sobre la interacción entre adhesión posaclaramiento y tratamientos para controlar esas interacciones. Con base en la literatura revisada se puede concluir que un tiempo de espera entre aclaramiento y procedimiento restaurativo debe ser por lo menos de 7 días para que todo el oxígeno residual remanente pueda ser liberado de la estructura dental y, en los casos que sea necesario hacer una restauración inmediata al proceso de aclaramiento, el uso de agente antioxidante como ascorbato de sodio 10% en la forma de gel es una alternativa viable para disminuir los efectos del aclaramiento en el procedimiento adhesivo.
Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado... more Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado en dos tipos de resinas compuestas. Materiales y métodos: se realizaron 36 cuerpos de prueba con 12 mm de diámetro y 4 mm de altura, con dos resinas: Filtek z350 y Ena Miscerium. Después de la confec-ción, los cuerpos de prueba se llevaron al microduremetro y a espectroscopia de infrarrojo, y fueron sometidos a cuatro procesos de pospolimerización: agua en ebullición, microonda, calor seco, autoclave y horno gradia. Resultados: se hizo análisis estadístico por medio de Anova de dos factores con postest Tukey por resina evaluada, se presentan media y desviación estándar, los valores de grado de conversión muestran un gran aumento en la resina Ena comparado con el grupo control (63,81%), cuando es realizado pospolimerización con calor seco (89,02%) y una gran disminución cuando es realizado con agua en ebullición (36,41%). Con-clusiones: el proceso de curado posterior por microondas y aut...
The objective of this study was to evaluate the effect of passive or active phosphoric acid (PA) ... more The objective of this study was to evaluate the effect of passive or active phosphoric acid (PA) application after hydrofluoric acid (HA) treatment on the microshear bond strength of lithium disilicate. Thirty ceramic discs were made with IPS Emax 2 (10 mm thick and 10 mm diameter). The specimens were divided into 3 groups, A: 9.6% HA application; AF: 9.6% HA application + cleaning with 37% PA in passive mode and AFF: 9.6% HA application + cleaning with 37% PA in active mode. For the microshear test, four tygons (0.9 mm diameter and 0.2 mm high) were filled with resin cement (RelyX Ultimate) and placed on the ceramic disks. After testing, the fracture modes were examined under scanning electron microscopy. Data were analyzed by one-way ANOVA and Tukey's post test (α=0.05). The bond strength values were significantly higher in Group AFF (11.0±2.5 MPa) compared with group A (8.1±2.6 MPa) (p<0.002). AF group was not statistically different (9.4±2.5 MPa) from Group A. It was conc...
Preheated silene effect in shear bond of ceramic lithium disilicate and cements Efecto del silano... more Preheated silene effect in shear bond of ceramic lithium disilicate and cements Efecto del silano precalentado en la resistencia de unión de las ceramicas de disilicato de litio y cementos
Objective: After completing dental whitening procedures, there is residual oxygen that affects th... more Objective: After completing dental whitening procedures, there is residual oxygen that affects the values, of bond strength of adhesives, therefore, the objective is to evaluate the effects on bond strength to bleaching tooth microshear with hydrogen peroxide 35% after application of Aloe Vera and sodium ascorbate. Method: Fifteen third molar teeth were divided into 3 groups (C: Control, AS: Sodium Ascorbate, AV: Aloe Vera), the teeth were cut to make two hemidents included in PVC pipes and sanded with sandpaper 400 and 600 of granulation, which was made of hydrogen peroxide bleaching with 35% (Blue Whiteness HP, FGM, Joinville, SC, Brazil) and restored with conventional adhesive (AMBAR FGM, Joinville, SC, Brazil) and resin (Filtek P60, 3M ESPE, St Paul, MN) in cylinders 0.7 mm in diameter and 1.2 mm in height, light-cured for 40 seconds, they were brought to the test of microshear. Result: The bond strength values to microshear had no significant difference compared to the control ...
A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dud... more A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dudas sobre su uso han sido explicadas, mucho menos los efectos adversos sobre la resistencia de unión de restauraciones adhesivas en esmalte/dentina, los cuales todavía siguen siendo muy controvertidos. Esta revisión de tema tiene como objetivo analizar conceptos sobre la interacción entre adhesión posaclaramiento y tratamientos para controlar esas interacciones. Con base en la literatura revisada se puede concluir que un tiempo de espera entre aclaramiento y procedimiento restaurativo debe ser por lo menos de 7 días para que todo el oxígeno residual remanente pueda ser liberado de la estructura dental y, en los casos que sea necesario hacer una restauración inmediata al proceso de aclaramiento, el uso de agente antioxidante como ascorbato de sodio 10% en la forma de gel es una alternativa viable para disminuir los efectos del aclaramiento en el procedimiento adhesivo.
A longevidade de resina depende da sua ligação entre a margem de restaurações e o polímero, e um ... more A longevidade de resina depende da sua ligação entre a margem de restaurações e o polímero, e um fator que influencia a este aspecto, é a tensão de contração. Assim, o grupo de trabalho faz a seguinte análise sistemática para verificar a influência da composição das resinas composta na tensão de contração. As seguintes bases de dados eletrônicas foram pesquisadas: MEDLINE (via PubMed e Ovídio-de 2004 a janeiro de 2014), com as palavras-chave: estresse de contração, grau de conversão, resina composta. Para tensão de contração, os melhores resultados foram encontrados quando o monômero BISGMA foi utilizada e para a composição inorgânica, uma relação inversa foi observada: o aumento do teor de carga inorgânica diminui estresse de contração. Tensão de contração de resinas compostas: efeito da composição do material-revisão sistemática
To evaluate the influence of fluoride delivery and restoration time point on the microshear bond ... more To evaluate the influence of fluoride delivery and restoration time point on the microshear bond strength (mSBS) and degree of conversion (DC) values of an adhesive applied on bleached enamel. Fifty-four enamel specimens were submitted to bleaching and divided into 3 groups of n = 18: group HP: 35% hydrogen peroxide (HP); group HPF: HP + 1.23% sodium fluoride application (F); group PF: 38% HP with F. A control group of n = 6 was neither bleached nor fluoridated. Subsequently, each group except the control was subdivided into 3 subgroups (n = 6) to be restored immediately, or at 7 or 14 days. Tygon tubes were filled with composite resin and placed on enamel surfaces, then the mSBS test was performed. The DC of the interface was observed with Raman spectroscopy. The data were submitted to two-way ANOVA and Tukey's and Dunnet's post-hoc test (α = 0.05). The mSBS results showed higher values for groups HP and HPF at 14 days compared with immediate and 7 days (p < 0.05). Lower...
This review aimed to examine the evolution of the composite resins`s photoinitiator system, with ... more This review aimed to examine the evolution of the composite resins`s photoinitiator system, with emphasis on those developed in recent years. This review covered literature from 1990 to 2013 and only papers with the key words of interest were included: "coinitiators", "amines", "composite resins", "photopolymerization". The search used full-text papers from PubMed and Science Direct databasis. It was included only English papers, and meeting abstracts and short communications were excluded. Hand search of the references completed the review. A total of 29 articles were studied. Many coinitiators are being researched as an alternative to traditional tertiary amines, particularly in order to improve the physical and mechanical properties of the final polymer and its biocompatibility with oral tissues. Polymerizable amines, natural compounds, and coinitiators with low toxicity and antiseptic properties were studied, and the results found they wou...
RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no toda... more RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dudas sobre su uso han sido explicadas, mucho menos los efectos adversos sobre la resistencia de unión de restauraciones adhesivas en esmalte/dentina, los cuales todavía siguen siendo muy controvertidos. Esta revisión de tema tiene como objetivo analizar conceptos sobre la interacción entre adhesión posaclaramiento y tratamientos para controlar esas interacciones. Con base en la literatura revisada se puede concluir que un tiempo de espera entre aclaramiento y procedimiento restaurativo debe ser por lo menos de 7 días para que todo el oxígeno residual remanente pueda ser liberado de la estructura dental y, en los casos que sea necesario hacer una restauración inmediata al proceso de aclaramiento, el uso de agente antioxidante como ascorbato de sodio 10% en la forma de gel es una alternativa viable para disminuir los efectos del aclaramiento en el procedimiento adhesivo.
Objective: To evaluate the influence of application methods and times ofself-etching adhesive sys... more Objective: To evaluate the influence of application methods and times ofself-etching adhesive systems on the micro-shear bond strength (SBS) and conditioning pattern of enamel. Methods: Human molars were divided into 12 groups according to the combination of the factors Adhesive (All Bond SE[ALB], Clearfil S3 Bond [CS3]and Clearfil SE Bond [CSE]), Application method (active [A]or passive [P]) and application time (20 or 40 s). Teeth were embedded in acrylic resin, ground until a flat enamel area was exposed and polished with 600-grit SiC paper. The self-etching adhesive systems were applied according to the factors under investigation (n=5). Five polyethylene cylinders were positioned over each sample, filled in with a composite resin and photoactivated for 40 s at 600 mW/cm2. After 24h, the cylinders were removed and submitted to SBS test at 1mm/min. The etching pattern produced by the materials under the experimental conditions was evaluated under scanning electron microscopy. Dat...
The aim of this study was to evaluate different conditioning protocols and sonic/ ultrasonic appl... more The aim of this study was to evaluate different conditioning protocols and sonic/ ultrasonic application of an infiltrant resin (IR) in artificial white spot lesions (AWSL). the V/L surfaces of 48 molars were induced to an AWSL and divided in 6 groups, according to the conditioning protocols and application technique: 15% hydrochloric acid (HA) + manual application of the IR; HA + 37% phosphoric acid (PA) + manual application of the IR; HA + ultrasonic application (U) of the IR; HA + sonic application (S) of the IR; PA+HA+S; and PA+HA+U. For the Penetration Depth (PD), the crowns were etched with HA for 120s. The IR Icon® (DMG) was applied according to the manufacturer`s instructions. The crowns were dye penetrated (0.1% red fluorophore rhodamine B isothiocyanate for 12h) and bleached with 30% hydrogen peroxide for 12 h. The discs were immersed in a 50% ethanol solution, containing 100 µM of sodium fluorescein. The PD (in µm) was measured using confocal laser scanning microscopy (20x). The bond strength (BS) was performed by michoshear test (0.5 mm/min). Data were submitted to 2-way ANOVA and Tukey (α=0.05). For BS, the interaction was not significant (p>0.05). For PD, the main factors were significant (application-p<0.001; conditioning technique-p=0.003). The ultrasonic application showed the highest PD values. PA+HA presented higher results than HA. The sonic/ultrasonic applications and the use of phosphoric acid prior to hydrochloric acid improved PD of the infiltrant resin. Conditioning protocols or application techniques did not influence BS values.
Conical implant–abutment connections are popular for their stability; however, in other condition... more Conical implant–abutment connections are popular for their stability; however, in other conditions, such as excessive force, implants and abutments can absorb all the stress. Some connections with three points of support can resist more than conical connections. In recent years, different studies has shown that the design of a connection affects its stability. The aim of this study was to analyze and compare the stresses in finite elements (FEs) in a newly proposed conical triangular connection in implants with hexagonal and conical connections. A nonlinear 3D FE parametric model was developed using SOLIDWORKS 2017®. All the connections, i.e., external and internal hexagons, morse taper, conical connection, and the new conical triangular proposal were compared when axial forces of 150, 250, and 350 N were applied to the occlusal. The maximum stress was found in the external hexagon. The maximum stress was concentrated at the level of the neck of the abutment, implant, and bone, exce...
Introduction: Dentin hypersensitivity is a common pathology, produced by exposed dental tubules. ... more Introduction: Dentin hypersensitivity is a common pathology, produced by exposed dental tubules. Objectives: The aim of this study was the evaluation of the effectiveness of experimental toothpaste based on nano-hydroxyapatite (nHAP) obtained from chicken eggshell in the obliteration of dentinal tubules (DTs). Material and methods: Toothpastes with different percentages of nHAP were formulated, including 3%, 7%, and 15% of nHAP, a commercial paste, and a toothpaste without nHAP. Assays were made using healthy premolar samples (n = 50). The pastes were applied and brushed for 7 days after a first erosive cycle, then a second erosive cycle was made at 15 days. Samples were analyzed using scanning electron microscopy and confocal Raman microscopy at three times: after the first erosive cycle (T0), after applications of the pastes (T7), and after the second erosive cycle (T15). Results: The quantitative analysis of the micrographs showed a significant difference between the experimental toothpastes with respect to the controls. Moreover, there was no statistically significant difference between the experimental toothpastes at time T7. By mineral concentration analysis, the 3%-nHAP toothpaste presented a significant difference against conventional toothpaste, when evaluating mineral concentration at 7 days. Conclusions: The experimental paste is effective in obliterating DTs at concentrations of 7 and 15%, in addition to being stable over time.
Objetivo. Evaluar la resistencia de union con doble aplicacion de SSA-Bond sobre dentina. Metodos... more Objetivo. Evaluar la resistencia de union con doble aplicacion de SSA-Bond sobre dentina. Metodos. Se utilizaron 10 dientes incisivos bovinos, los dientes fueron lijados hasta llegar a dentina con lija 600, y despues hasta 2000, dividiendolos aleatoriamente en dos grupos, GA, aplicacion de adhesivo segun el fabricante (n=5), GB aplicacion de adhesivos segun el fabricante con aplicacion de dos capas de de SSA-Bond (n=5), la aplicacion fue estandarizadas con una balanza analitica a una presion (4,0 ± 1,0g), cada grupo fue restaurado a una altura de 6 mm con Resina Filtek TM Silorano (P 90). Fue realizado cortes para conseguir palitos de resina/dentina con una area de 1 mm 2 , 10 mm de largo, y fue llevado a teste de microtraccion a una velocidad de 0,5 mm/min. Se analizaron los datos con ANOVA y test de TUKEY, Resultados. Se encontro una media (25,5 MPa), GB (13,4 MPa) p=0,05. Conclusiones. La doble aplicacion de SSA-Bond no mejora la resistencia union del adhesivo SSA
Objectives: evaluate the micro-shear bond strength in lithium disilicate ceramics with different ... more Objectives: evaluate the micro-shear bond strength in lithium disilicate ceramics with different manufacturing process treated with two one-step self-etching adhesives. Methods: For manufacturing the test specimens (4 groups, 5 specimens each) infiltrated and machined lithium disilicate ceramics discs were prepared (IPS Emax 2). The discs were placed in polyvinyl chloride (PVC) tubes, and two different adhesive systems were applied to the disc surfaces according to the experimental groups (Group MG: machined lithium disilicate + Gluma 2Bond, Group MB: machined lithium disilicate + and Bond2.0, Group IG: Infiltrated lithium disilicate + Gluma 2Bond, and group IB: infiltrated lithium disilicate + Bond2.0), immediately beams of Filtek Z350 Flow resin were constructed using tygons as molds over the ceramic discs. The micro-shear bond strength (MSBS) was tested using a universal testing machine with a crosshead speed set at 0.75 mm/min until failure occurred. The MSBS values were calculated in Megapascals. The data was analyzed with one-way ANOVA test and the level of significance was set at 5%. Results: The MSBS were different between all groups. MG group showed the highest values (26.48 ± 5.74), the difference was statistically significant from the other groups (p<0.05).
Objetivo: evaluar los efectos sobre la dureza superficial y la rugosidad de un gel clareador de p... more Objetivo: evaluar los efectos sobre la dureza superficial y la rugosidad de un gel clareador de peróxido de hidrógeno 35% con posterior cepillado. Materiales y métodos: se realizó un estudio experimental In vitro, fueron realizados cuarenta bloques de esmalte de 3mm 2 de terceros molares en la porción vestibular, fueron lijados con lijas de granulación 600-1500, para ser divididos en las dos metodologías: microdureza Vickers (n=20) y microscopia de fuerza atómica (n=20). Estos fueron divididos en dos grupos, GC y GCC. En el grupo GC (n=10) se realizó aclaramiento con peróxido de hidrógeno al 35% mientras que en el GCC, el aclaramiento se hizó con peróxido de hidrógeno al 35% y posterior a éste se realizó cepillado con una crema dental que contenía 1450 ppm de flúor. Se realizó un test de ANOVA, un post test t de Student con un nivel de significancia α≤0,05, para conocer las diferencias entre los grupos. Resultados: se encontró una diferencia estadísticamente significativa sobre el numero de microdureza vickers (NDV) en el grupo GCC (antes: 369,4 ± 19,4 NDV, después: 392,4 ± 14,2 NDV) pero no se observó ninguna diferencia estadísticamente significativa sobre la rugosidad (Ra), en ninguno de los dos grupos. Conclusión: el cepillado con crema dental con 1450 ppm de fluor, después del proceso de aclaramiento dental con peróxido de hidrógeno 35% mantiene la estabilidad de la dureza superficial del esmalte.
To examine the effect of the alternative coinitiator 4,4'bis dimethylamino benzydrol (BZN) in... more To examine the effect of the alternative coinitiator 4,4'bis dimethylamino benzydrol (BZN) in degree of conversion (DC), mechanical and biological properties of experimental composites. The coinitiator BZN was used in three concentrations (0.2, 0.5 and 1.2%), and the coinitiator DMAEMA was used as control at the same concentrations as above. The molar concentration of camphorquinone (CQ) and coinitiators was kept constant (1:1). The composites were manipulated and submitted to microhardness test (VHN), flexural and compressive strength (in MPa), elastic modulus (GPa), DC (FT-IR) and in vitro cytotoxicity (against 3T3 fibroblastic cells) of the experimental resins. Data were subjected to two-way ANOVA and Tukey post-test (α=0.05). The experimental composite resin with BZN showed higher DC values compared to control DMAEMA groups. For the mechanical properties, microhardness values were higher in BZN groups; flexural strength and elastic modulus were similar between all the groups...
Revista Facultad De Odontologia Universidad De Antioquia, Jun 28, 2013
RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no toda... more RESUMEN. A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dudas sobre su uso han sido explicadas, mucho menos los efectos adversos sobre la resistencia de unión de restauraciones adhesivas en esmalte/dentina, los cuales todavía siguen siendo muy controvertidos. Esta revisión de tema tiene como objetivo analizar conceptos sobre la interacción entre adhesión posaclaramiento y tratamientos para controlar esas interacciones. Con base en la literatura revisada se puede concluir que un tiempo de espera entre aclaramiento y procedimiento restaurativo debe ser por lo menos de 7 días para que todo el oxígeno residual remanente pueda ser liberado de la estructura dental y, en los casos que sea necesario hacer una restauración inmediata al proceso de aclaramiento, el uso de agente antioxidante como ascorbato de sodio 10% en la forma de gel es una alternativa viable para disminuir los efectos del aclaramiento en el procedimiento adhesivo.
Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado... more Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado en dos tipos de resinas compuestas. Materiales y métodos: se realizaron 36 cuerpos de prueba con 12 mm de diámetro y 4 mm de altura, con dos resinas: Filtek z350 y Ena Miscerium. Después de la confec-ción, los cuerpos de prueba se llevaron al microduremetro y a espectroscopia de infrarrojo, y fueron sometidos a cuatro procesos de pospolimerización: agua en ebullición, microonda, calor seco, autoclave y horno gradia. Resultados: se hizo análisis estadístico por medio de Anova de dos factores con postest Tukey por resina evaluada, se presentan media y desviación estándar, los valores de grado de conversión muestran un gran aumento en la resina Ena comparado con el grupo control (63,81%), cuando es realizado pospolimerización con calor seco (89,02%) y una gran disminución cuando es realizado con agua en ebullición (36,41%). Con-clusiones: el proceso de curado posterior por microondas y aut...
The objective of this study was to evaluate the effect of passive or active phosphoric acid (PA) ... more The objective of this study was to evaluate the effect of passive or active phosphoric acid (PA) application after hydrofluoric acid (HA) treatment on the microshear bond strength of lithium disilicate. Thirty ceramic discs were made with IPS Emax 2 (10 mm thick and 10 mm diameter). The specimens were divided into 3 groups, A: 9.6% HA application; AF: 9.6% HA application + cleaning with 37% PA in passive mode and AFF: 9.6% HA application + cleaning with 37% PA in active mode. For the microshear test, four tygons (0.9 mm diameter and 0.2 mm high) were filled with resin cement (RelyX Ultimate) and placed on the ceramic disks. After testing, the fracture modes were examined under scanning electron microscopy. Data were analyzed by one-way ANOVA and Tukey's post test (α=0.05). The bond strength values were significantly higher in Group AFF (11.0±2.5 MPa) compared with group A (8.1±2.6 MPa) (p<0.002). AF group was not statistically different (9.4±2.5 MPa) from Group A. It was conc...
Preheated silene effect in shear bond of ceramic lithium disilicate and cements Efecto del silano... more Preheated silene effect in shear bond of ceramic lithium disilicate and cements Efecto del silano precalentado en la resistencia de unión de las ceramicas de disilicato de litio y cementos
Objective: After completing dental whitening procedures, there is residual oxygen that affects th... more Objective: After completing dental whitening procedures, there is residual oxygen that affects the values, of bond strength of adhesives, therefore, the objective is to evaluate the effects on bond strength to bleaching tooth microshear with hydrogen peroxide 35% after application of Aloe Vera and sodium ascorbate. Method: Fifteen third molar teeth were divided into 3 groups (C: Control, AS: Sodium Ascorbate, AV: Aloe Vera), the teeth were cut to make two hemidents included in PVC pipes and sanded with sandpaper 400 and 600 of granulation, which was made of hydrogen peroxide bleaching with 35% (Blue Whiteness HP, FGM, Joinville, SC, Brazil) and restored with conventional adhesive (AMBAR FGM, Joinville, SC, Brazil) and resin (Filtek P60, 3M ESPE, St Paul, MN) in cylinders 0.7 mm in diameter and 1.2 mm in height, light-cured for 40 seconds, they were brought to the test of microshear. Result: The bond strength values to microshear had no significant difference compared to the control ...
A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dud... more A pesar del tan alto éxito clínico de los procedimientos de aclaramiento dental, no todas las dudas sobre su uso han sido explicadas, mucho menos los efectos adversos sobre la resistencia de unión de restauraciones adhesivas en esmalte/dentina, los cuales todavía siguen siendo muy controvertidos. Esta revisión de tema tiene como objetivo analizar conceptos sobre la interacción entre adhesión posaclaramiento y tratamientos para controlar esas interacciones. Con base en la literatura revisada se puede concluir que un tiempo de espera entre aclaramiento y procedimiento restaurativo debe ser por lo menos de 7 días para que todo el oxígeno residual remanente pueda ser liberado de la estructura dental y, en los casos que sea necesario hacer una restauración inmediata al proceso de aclaramiento, el uso de agente antioxidante como ascorbato de sodio 10% en la forma de gel es una alternativa viable para disminuir los efectos del aclaramiento en el procedimiento adhesivo.
A longevidade de resina depende da sua ligação entre a margem de restaurações e o polímero, e um ... more A longevidade de resina depende da sua ligação entre a margem de restaurações e o polímero, e um fator que influencia a este aspecto, é a tensão de contração. Assim, o grupo de trabalho faz a seguinte análise sistemática para verificar a influência da composição das resinas composta na tensão de contração. As seguintes bases de dados eletrônicas foram pesquisadas: MEDLINE (via PubMed e Ovídio-de 2004 a janeiro de 2014), com as palavras-chave: estresse de contração, grau de conversão, resina composta. Para tensão de contração, os melhores resultados foram encontrados quando o monômero BISGMA foi utilizada e para a composição inorgânica, uma relação inversa foi observada: o aumento do teor de carga inorgânica diminui estresse de contração. Tensão de contração de resinas compostas: efeito da composição do material-revisão sistemática
To evaluate the influence of fluoride delivery and restoration time point on the microshear bond ... more To evaluate the influence of fluoride delivery and restoration time point on the microshear bond strength (mSBS) and degree of conversion (DC) values of an adhesive applied on bleached enamel. Fifty-four enamel specimens were submitted to bleaching and divided into 3 groups of n = 18: group HP: 35% hydrogen peroxide (HP); group HPF: HP + 1.23% sodium fluoride application (F); group PF: 38% HP with F. A control group of n = 6 was neither bleached nor fluoridated. Subsequently, each group except the control was subdivided into 3 subgroups (n = 6) to be restored immediately, or at 7 or 14 days. Tygon tubes were filled with composite resin and placed on enamel surfaces, then the mSBS test was performed. The DC of the interface was observed with Raman spectroscopy. The data were submitted to two-way ANOVA and Tukey's and Dunnet's post-hoc test (α = 0.05). The mSBS results showed higher values for groups HP and HPF at 14 days compared with immediate and 7 days (p < 0.05). Lower...
This review aimed to examine the evolution of the composite resins`s photoinitiator system, with ... more This review aimed to examine the evolution of the composite resins`s photoinitiator system, with emphasis on those developed in recent years. This review covered literature from 1990 to 2013 and only papers with the key words of interest were included: "coinitiators", "amines", "composite resins", "photopolymerization". The search used full-text papers from PubMed and Science Direct databasis. It was included only English papers, and meeting abstracts and short communications were excluded. Hand search of the references completed the review. A total of 29 articles were studied. Many coinitiators are being researched as an alternative to traditional tertiary amines, particularly in order to improve the physical and mechanical properties of the final polymer and its biocompatibility with oral tissues. Polymerizable amines, natural compounds, and coinitiators with low toxicity and antiseptic properties were studied, and the results found they wou...
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