ABSTRACT
Abstract: The purpose of this study was to compare the shear bond strength (SBS) of four resin-based composite materials to a silicate-based cement using a ''no-wait'' universal bond with self-etch (SE) and etch-and-rinse (ER) modes. Acrylic blocks (n=80, 2mm depth, 5mm diameter central hole) were prepared. The holes were filled with BiodentineTM (BD) and divided into 4 main groups (n=20) according to the composite resin type used: Group FZ250: FiltekTM Z250 Universal Restorative (microhybrid), Group SDR: SDR Plus U Bulk Fill Flowable (low-viscosity bulk-fill), Group FBP: FiltekTM Bulk Fill Posterior (high-viscosity bulk-fill), Group EF: EsFlow™ Universal Flowable Composite (nanohybrid). A 'no-wait' universal bond (Clearfil Universal Bond Quick) was used for bonding application. Then each group was divided into 2 subgroups according to the etching mode applied (ER and SE). SBSs were measured and stereomicroscope was used to identify the failure modes. Selected samples of fracture surfaces were imaged by SEM. Tukey's post-hoc and One-way ANOVA tests were used to analyze data. There were statistically significant differences among the composite groups (p 0.05). The SBS of BD to the resin composites depends on the composite type but application of the 'no-wait' universal bond in different etching modes is regardless of the SBS of BD to resin composites.
Resumen El objetivo de este estudio fue comparar la resistencia de adhesión al cizallamiento (SBS) de cuatro resinas con un cemento a base de silicato utilizando una adhesivo universal "no-wait" de autograbado (SE) y grabado y lavado (ER). Se prepararon bloques acrílicos (n=80, de 2mm de profundidad y un agujero central de 5mm de diámetro). Los agujeros se rellenaron con BiodentineTM (BD) y se dividieron en 4 grupos principales (n=20) según el tipo de resina compuesta utilizada: Grupo FZ250: FiltekTM Z250 Universal Restorative (microhíbrido), Grupo SDR: SDR Plus U Bulk Fill Flowable (bulk-fill de baja viscosidad), Grupo FBP: FiltekTM Bulk Fill Posterior (bulk-fill de alta viscosidad), Grupo EF: EsFlow™ Universal Flowable Composite (nanohíbrido). Para la aplicación de la adhesión se utilizó un adhesivo universal "no-wait" (Clearfil Universal Bond Quick). A continuación, cada grupo se dividió en 2 subgrupos según el modo de grabado aplicado (ER y SE). Se midieron los SBS y se utilizó el estereomicroscopio para identificar los modos de fallo. Las muestras seleccionadas de las superficies de fractura se analizaron mediante SEM. Se utilizaron las pruebas post-hoc de Tukey y ANOVA de una vía para analizar los datos. Hubo diferencias estadísticamente significativas entre los grupos de composites (p0,05). La SBS de la BD a los composites de resina depende del tipo de composite, pero la aplicación de la unión universal "no-wait" en los diferentes modos de grabado es independiente de la SBS de la BD a los composites de resina.
Subject(s)
Humans , Dentin-Bonding Agents , Shear Strength , TurkeyABSTRACT
PURPOSE: To evaluate the effects of hemodialysis (HD) on corneal and anterior chamber morphometry, as well as intraocular pressure (IOP) in patients with end-stage renal disease. METHODS: Fifty right eyes were examined 30 minutes before and after HD. IOP was measured with a Goldmann applanation tonometer, and Ehlers' formula was used to calculate the corrected IOP values. The central corneal thickness (CCT), corneal volume (CV), keratometric values, anterior chamber depth (ACD), aqueous depth (AQD), anterior chamber volume (ACV), and anterior chamber angle (ACA) in the nasal and temporal quadrants were measured with a Sirius anterior segment analysis system. Blood urea nitrogen levels, body mass, and systolic and diastolic arterial pressure were also measured before and after HD. RESULTS: The mean age was 60.80 ± 13.38 (range: 35-80) years. The mean uncorrected and corrected IOP values decreased from 18.06 ± 3.91 and 18.31 ± 4.83 mmHg to 16.94 ± 3.87 and 16.95 ± 4.74 mmHg after HD, respectively (p=0.011 and p=0.003, respectively). The mean CCT decreased from 536.38 ± 24.73 to 533.18 ± 27.25 µm (p=0.002), and the mean CV decreased from 57.52 ± 3.15 to 55.68 ± 3.55 mm³ (p<0.001) after HD. There were no significant changes in ACD, AQD, ACV, ACA, or the keratometric values (p>0.05 for all values). There were no significant correlations between the ocular and systemic parameters (p>0.05 for all correlations). CONCLUSIONS: Uncorrected IOP, corrected IOP, CCT, and CV values decreased after HD, whereas the anterior chamber morphometry values remained similar between the measurements performed before and after HD.
Subject(s)
Anterior Chamber/pathology , Cornea/pathology , Intraocular Pressure/physiology , Kidney Failure, Chronic/physiopathology , Kidney Failure, Chronic/therapy , Renal Dialysis/adverse effects , Adult , Aged , Aged, 80 and over , Blood Urea Nitrogen , Corneal Pachymetry , Corneal Topography , Cross-Sectional Studies , Female , Humans , Male , Middle Aged , Reference Values , Statistics, Nonparametric , Time Factors , Tonometry, Ocular , Treatment OutcomeABSTRACT
ABSTRACT Purpose: To evaluate the effects of hemodialysis (HD) on corneal and anterior chamber morphometry, as well as intraocular pressure (IOP) in patients with end-stage renal disease. Methods: Fifty right eyes were examined 30 minutes before and after HD. IOP was measured with a Goldmann applanation tonometer, and Ehlers' formula was used to calculate the corrected IOP values. The central corneal thickness (CCT), corneal volume (CV), keratometric values, anterior chamber depth (ACD), aqueous depth (AQD), anterior chamber volume (ACV), and anterior chamber angle (ACA) in the nasal and temporal quadrants were measured with a Sirius anterior segment analysis system. Blood urea nitrogen levels, body mass, and systolic and diastolic arterial pressure were also measured before and after HD. Results: The mean age was 60.80 ± 13.38 (range: 35-80) years. The mean uncorrected and corrected IOP values decreased from 18.06 ± 3.91 and 18.31 ± 4.83 mmHg to 16.94 ± 3.87 and 16.95 ± 4.74 mmHg after HD, respectively (p=0.011 and p=0.003, respectively). The mean CCT decreased from 536.38 ± 24.73 to 533.18 ± 27.25 µm (p=0.002), and the mean CV decreased from 57.52 ± 3.15 to 55.68 ± 3.55 mm³ (p<0.001) after HD. There were no significant changes in ACD, AQD, ACV, ACA, or the keratometric values (p>0.05 for all values). There were no significant correlations between the ocular and systemic parameters (p>0.05 for all correlations). Conclusions: Uncorrected IOP, corrected IOP, CCT, and CV values decreased after HD, whereas the anterior chamber morphometry values remained similar between the measurements performed before and after HD.
RESUMO Objetivo: Avaliar os efeitos da hemodiálise (HD) na morfometria da córnea e da câmara anterior e da pressão intraocular (PIO) em pacientes com doença renal terminal. Métodos: Cinquenta olhos direitos foram examinados 30 minutos antes e após hemodiálise. A pressão intraocular foi medida com um tonômetro de aplanação de Goldmann, e a fórmula de Ehlers foi utilizada para calcular os valores de pressão in traocular corrigidos. Mediram-se a espessura corneana central (CCT), o volume corneano (CV), os valores ceratométricos, a profundidade da câmara anterior (ACD), a profundidade aquosa (AQD), o volume da câmara anterior (ACV) e o ângulo da câmara anterior (ACA) nos quadrantes nasais e temporais com um sistema de análise de segmento Sirius anterior. Os níveis de nitrogênio ureico no sangue (BUN), peso corporal e pressão arterial sistólica e diastólica também foram medidos antes e após a HD. Resultados: A média de idade foi de 60,80 ± 13,38 (35-80) anos. Os valores médios não corrigidos e corrigidos da pressão intraocular diminuíram de 18,06 ± 3,91 e 18,31 ± 4,83 mmHg para 16,94 ± 3,87 e 16,95 ± 4,74 mmHg após hemodiálise (p=0,011 e p=0,003, respectivamente). A espessura corneana central média diminuiu de 536,38 ± 24,73 para 533,18 ± 27,25 µm (p=0,002), e o volume corneano médio diminuiu de 57,52 ± 3,15 para 55,68 ± 3,55 mm³ (p<0,001) após hemodiálise. Não houve alteração significativa nos valores de profundidade da câmara anterior, profundidade aquosa, volume da câmara anterior, ângulo da câmara anterior e ceratométricos (p>0,05 para todos os valores). Não houve correlação significativa entre os parâmetros oculares e sistêmicos (p>0,05 para todas as correlações). Conclusão: A pressão intraocular não corrigida, a pressão intraocular corrigida, a espessura corneana central e os valores de volume corneano diminuíram após hemodiálise, enquanto os valores de morfometria da câmara anterior foram semelhantes entre as medidas realizadas antes e após a hemodiálise.