12 research outputs found
Evaluación de la resistencia a la tracción del acrílico después de la desinfección con agua ozonizada y microondas.
No full textBackground: There is a need for safe disinfection methods without a detrimental effect on the acrylic denture base. Aim: the purpose of the current study was to evaluate the effect of ozonated water and two protocols of microwave disinfection on tensile bond strength of high-impact acrylic. Material and methods: Eighty samples were divided into four major groups: one control and three experimental groups, 20 specimens each. The experimental groups each received either disinfection by ozonated water, microwave 850W/1min, or microwave 650W/6min. Further division of the major groups into two sub-groups depending on the number of disinfection cycles and total immersion time in distilled water: One cycle and one day versus seven cycles and seven days. The control group specimens were immersed in distilled water without any disinfection for either one day or seven days. Tensile strength testing was performed on the specimens from the eight groups. The data were analyzed by SPSS version 21#. The ANOVA and Tukey-HSD multiple comparison tests were used for comparison for groups. Results: A non-significant difference in the tensile strength was observed in the groups subjected to one cycle of ozone or microwave disinfection at 850W/1min. There was a significant decrease in tensile strength for the specimens subjected to one cycle of 650W/6min microwaving. The number of testing cycles and storage time in distilled water had a significant impact on the tensile strength of the acrylic in all tested groups, by decreasing it. Conclusion: Ozone disinfection and microwaving at 850W for one minute did not affect the tensile strength of the acrylic, but repeated disinfection over seven days at one cycle per day impaired the tensile strength of the acrylic resin.Antecedentes: Existe la necesidad de métodos de desinfección seguros sin un efecto perjudicial sobre la base de prótesis acrílica. Objetivo: el objetivo del presente estudio fue evaluar el efecto del agua ozonizada y dos protocolos de desinfección por microondas sobre la resistencia a la tracción del acrílico de alto impacto. Material y Métodos: Ochenta muestras se dividieron en cuatro grandes grupos: un grupo control y tres grupos experimentales, 20 especímenes cada uno. Cada grupo experimental recibió desinfección con agua ozonizada, microondas de 850 W/1 min o microondas de 650 W/6 min. Los grupos principales se dividieron en dos subgrupos según el número de ciclos de desinfección y el tiempo total de inmersión en agua destilada: un ciclo y un día versus siete ciclos y siete días. Las muestras del grupo de control se sumergieron en agua destilada sin ninguna desinfección durante uno o siete días, respectivamente. Se realizaron pruebas de resistencia a la tracción en las muestras de los ocho grupos. Los datos fueron analizados por SPSS versión 21. Se utilizaron las pruebas de comparación múltiple ANOVA y Tukey-HSD para la comparación entre grupos.. Resultados: Se observó una diferencia no significativa en la resistencia a la tracción en los grupos sometidos a un ciclo de desinfección con ozono o microondas a 850 W/1 min. Hubo una disminución significativa en la resistencia a la tracción para las muestras sometidas a un ciclo de microondas de 650 W/6 min. El número de ciclos de prueba junto al tiempo de almacenamiento en agua destilada tuvieron un impacto significativo en la resistencia a la tracción del acrílico en todos los grupos probados, al disminuirla. Conclusión: La desinfección con ozono y el microondas a 850 W durante un minuto no afectaron la resistencia a la tracción del acrílico, pero la desinfección repetida durante siete días en un ciclo por día afectó la resistencia a la tracción de la resina acrílica
Evaluation of Adding Ginger Oil on Sorption and Solubility of Soft Liners Using Different Saliva PH Levels
No full textEffect of the CO2 Laser as Surface Treatment on the Bond Strength of Heat Cured Soft Liner to the High Impact Acrylic Denture Base Material
No full textThe Effect of Nano Hydroxyapatite on the Bond Strength of Acrylic Teeth Repaired to an Acrylic Resin Denture Base Using Two Types of Auto Polymerized Acrylic Resins
No full textThe insufficiently binder between acrylic teeth and dentures is considered to be the primary cause of teeth fractures from the dentures and is one of the disadvantages of acrylic denture base material. This research has been conducted to assess various concentrations of Nano hydroxyapatite addition on the shear bond between repaired acrylic teeth and polymer. One-hundred specimens of resin were split into two main subdivisions. 50 specimens were repaired with cold cured Duracryl Plus and the other 50 were repaired with a special type of acrylic O-cry1. Each one was sectioned into tested groups depending on (1%., 2%., 3%, and 5% by wt. of nano hydroxyapatite) incorporation and control group (0% of nano hydroxyapatite) with (n=10). The Universal testing machine was utilized for shear bond strength measurement. The obtained values were diffracted by t-test, ANOVA, and LSD-test. There was an increase in bond strength that repairing with O-cry1 than Duracryl Plus with a heightening in the bond strength, which was seen with incorporating nano hydroxyapatite into the acrylic resin with a significant difference between them. The 2% wt. Nano hydroxyapatite group demonstrated the maximum mean values, while those for the 5% wt. Nano hydroxyapatite group were recording minimum value with a significant difference between them. Repairing with O-cry1 recording better bond strength than Duracryl Plus acrylic. Furthermore, the addition of hydroxyapatite in Nano-form has successfully improved the “shear bond strength” of teeth to the PMMA at 2% wt. nano hydroxyapatite
Tensile strength evaluation of acrylic after ozonated water and microwave disinfection
No full textBackground: There is a need for safe disinfection methods without a detrimental effect on the acrylic denture base. Aim: the purpose of the current study was to evaluate the effect of ozonated water and two protocols of microwave disinfection on tensile bond strength of high-impact acrylic. Material and methods: Eighty samples were divided into four major groups: one control and three experimental groups, 20 specimens each. The experimental groups each received either disinfection by ozonated water, microwave 850W/1min, or microwave 650W/6min. Further division of the major groups into two sub-groups depending on the number of disinfection cycles and total immersion time in distilled water: One cycle and one day versus seven cycles and seven days. The control group specimens were immersed in distilled water without any disinfection for either one day or seven days. Tensile strength testing was performed on the specimens from the eight groups. The data were analyzed by SPSS version 21#. The ANOVA and Tukey-HSD multiple comparison tests were used for comparison for groups. Results: A non-significant difference in the tensile strength was observed in the groups subjected to one cycle of ozone or microwave disinfection at 850W/1min. There was a significant decrease in tensile strength for the specimens subjected to one cycle of 650W/6min microwaving. The number of testing cycles and storage time in distilled water had a significant impact on the tensile strength of the acrylic in all tested groups, by decreasing it. Conclusion: Ozone disinfection and microwaving at 850W for one minute did not affect the tensile strength of the acrylic, but repeated disinfection over seven days at one cycle per day impaired the tensile strength of the acrylic resin.Antecedentes: Existe la necesidad de métodos de desinfección seguros sin un efecto perjudicial sobre la base de prótesis acrílica. Objetivo: el objetivo del presente estudio fue evaluar el efecto del agua ozonizada y dos protocolos de desinfección por microondas sobre la resistencia a la tracción del acrílico de alto impacto. Material y Métodos: Ochenta muestras se dividieron en cuatro grandes grupos: un grupo control y tres grupos experimentales, 20 especímenes cada uno. Cada grupo experimental recibió desinfección con agua ozonizada, microondas de 850 W/1 min o microondas de 650 W/6 min. Los grupos principales se dividieron en dos subgrupos según el número de ciclos de desinfección y el tiempo total de inmersión en agua destilada: un ciclo y un día versus siete ciclos y siete días. Las muestras del grupo de control se sumergieron en agua destilada sin ninguna desinfección durante uno o siete días, respectivamente. Se realizaron pruebas de resistencia a la tracción en las muestras de los ocho grupos. Los datos fueron analizados por SPSS versión 21. Se utilizaron las pruebas de comparación múltiple ANOVA y Tukey-HSD para la comparación entre grupos.. Resultados: Se observó una diferencia no significativa en la resistencia a la tracción en los grupos sometidos a un ciclo de desinfección con ozono o microondas a 850 W/1 min. Hubo una disminución significativa en la resistencia a la tracción para las muestras sometidas a un ciclo de microondas de 650 W/6 min. El número de ciclos de prueba junto al tiempo de almacenamiento en agua destilada tuvieron un impacto significativo en la resistencia a la tracción del acrílico en todos los grupos probados, al disminuirla. Conclusión: La desinfección con ozono y el microondas a 850 W durante un minuto no afectaron la resistencia a la tracción del acrílico, pero la desinfección repetida durante siete días en un ciclo por día afectó la resistencia a la tracción de la resina acrílica
TiO2-Nanofillers Effects on Some Properties of Highly- Impact Resin Using Different Processing Techniques
No full textBackground:The criteria of conventional curing of polymethyl methacrylate do not match the standard properties of the denture base materials.Objectives:This research was conducted to investigate the addition of TiO2nano practical on impact strength, thermal conductivity and color stability of acrylic resin cured by microwave in comparison to the conventional cured of heat-polymerized acrylic resin.Materials and Methods:120 specimens made of high impact acrylic resin were divided into two main groups according to the type of curing (water bath, microwave), then each group was subdivided into two groups according to the addition of 3% TiO2nano-fillers and control group (without the addition of TiO20%). Each group was subdivided according to the type of test into 3 groups with 10 specimens for each group. Data were statistically analyzed using Student t-test to detect the significant differences between tested and control groups at significance level (P<0.05).Results:According to curing type methods, the results showed that there was a significant decrease in impact strength of microwaved cured resin, but there was no significant difference in the thermal conductivity and color stability of resin. In addition, by using nanofiller, there was a significant increase in the impact strength and color stability with the addition of 3% TiO2nanofillers, but no significant difference was found in the thermal conductivity of the acrylic resin.Conclusion:The microwave curing of acrylic resin had no change in the color stability and thermal conductivity in comparison to the water bath, but the impact strength was decreased. The addition of 3% TiO2improved the impact and the color stability, but the thermal conductivity did not change.</jats:sec
Determinación de la rugosidad y dureza de la superficie de un revestimiento blando a base de silicona mollosil incorporada con aceite esencial de bergamota
No full textBackground: Recently, the incorporation of medicinal plant extracts into biomaterials has gained attention as a natural alternative with significant antifungal properties. The objective of the current study is to assess the impact of adding two different concentrations of Bergamot essential oil (BEO) on the surface roughness and surface hardness of silicone-based cold-cured soft liner material.Materials and Methods: The study consisted of three groups of silicone cold cured soft liner material mollosil, each group consists of 10 specimens: group1 (control) soft liner alone; group 2 with 5% BEO added to the catalyst of silicon soft liner; and group 3 with 6% of BEO added to the catalyst of silicon soft liner. Thirty samples were prepared for the different tests used in this study. The samples were divided according to tests into two main groups: surface hardness and surface roughness tests. Results: Surface roughness tests showed that control and 5% BEO groups had a lower mean value than the 6% BEO group which showed a higher roughness, and the experimental group with 5% BEO showed the lowest mean value, with non-significant difference among the groups. The results of shore A hardness test showed that the highest mean value was found for the control group and both 5% and 6% BEO groups showed lower mean values of hardness. Conclusion: The incorporation of bergamot essential oil had no effect on the surface roughness of soft liner while lowering the surface hardness of the liner material.Antecedentes: Recientemente, la incorporación de extractos de plantas medicinales en biomateriales ha ganado atención como una alternativa natural con importantes propiedades antifúngicas. El objetivo del presente estudio es evaluar el impacto de la adición de dos concentraciones diferentes de aceite esencial de bergamota (AEB) en la rugosidad y dureza superficial de material de revestimiento blando curado en frío a base de silicona.Materiales y métodos: El estudio consistió en tres grupos de material de revestimiento blando curado en frío de silicona mollosil, cada grupo consta de 10 muestras: grupo 1 (control) revestimiento blando solo; grupo 2 con 5% de AEB añadido al catalizador de revestimiento blando de silicona; y grupo 3 con 6% de AEB añadido al catalizador de revestimiento blando de silicona. Se prepararon treinta muestras para las diferentes pruebas utilizadas en este estudio. Las muestras se dividieron según las pruebas en dos grupos principales: dureza superficial y pruebas de rugosidad superficial. Resultado: Las pruebas de rugosidad de la superficie mostraron que los grupos de control y 5% AEB tuvieron un valor medio más bajo que el grupo 6% AEB que mostró una rugosidad más alta, y el grupo experimental con 5% AEB mostró el valor medio más bajo, con una diferencia no significativa entre los grupos. Los resultados de la prueba de dureza Shore A mostraron que el valor medio más alto se encontró para el grupo de control y los grupos 5% y 6% AEB mostraron valores medios de dureza más bajos.Conclusión: La incorporación de aceite esencial de bergamota no tuvo efecto sobre la rugosidad de la superficie del revestimiento blando mientras que redujo la dureza de la superficie del material del revestimiento
Determinación de la rugosidad y dureza de la superficie de un revestimiento blando a base de silicona mollosil incorporada con aceite esencial de bergamota
No full textBackground: Recently, the incorporation of medicinal plant extracts into biomaterials has gained attention as a natural alternative with significant antifungal properties. The objective of the current study is to assess the impact of adding two different concentrations of Bergamot essential oil (BEO) on the surface roughness and surface hardness of silicone-based cold-cured soft liner material.
Materials and Methods: The study consisted of three groups of silicone cold cured soft liner material mollosil, each group consists of 10 specimens: group1 (control) soft liner alone; group 2 with 5% BEO added to the catalyst of silicon soft liner; and group 3 with 6% of BEO added to the catalyst of silicon soft liner. Thirty samples were prepared for the different tests used in this study. The samples were divided according to tests into two main groups: surface hardness and surface roughness tests.
Results: Surface roughness tests showed that control and 5% BEO groups had a lower mean value than the 6% BEO group which showed a higher roughness, and the experimental group with 5% BEO showed the lowest mean value, with non-significant difference among the groups. The results of shore A hardness test showed that the highest mean value was found for the control group and both 5% and 6% BEO groups showed lower mean values of hardness.
Conclusion:The incorporation of bergamot essential oil had no effect on the surface roughness of soft liner while lowering the surface hardness of the liner material.Antecedentes: Recientemente, la incorporación de extractos de plantas medicinales en biomateriales ha ganado atención como una alternativa natural con importantes propiedades antifúngicas. El objetivo del presente estudio es evaluar el impacto de la adición de dos concentraciones diferentes de aceite esencial de bergamota (AEB) en la rugosidad y dureza superficial de material de revestimiento blando curado en frío a base de silicona.
Materiales y métodos: El estudio consistió en tres grupos de material de revestimiento blando curado en frío de silicona mollosil, cada grupo consta de 10 muestras: grupo 1 (control) revestimiento blando solo; grupo 2 con 5% de AEB añadido al catalizador de revestimiento blando de silicona; y grupo 3 con 6% de AEB añadido al catalizador de revestimiento blando de silicona. Se prepararon treinta muestras para las diferentes pruebas utilizadas en este estudio. Las muestras se dividieron según las pruebas en dos grupos principales: dureza superficial y pruebas de rugosidad superficial.
Resultado: Las pruebas de rugosidad de la superficie mostraron que los grupos de control y 5% AEB tuvieron un valor medio más bajo que el grupo 6% AEB que mostró una rugosidad más alta, y el grupo experimental con 5% AEB mostró el valor medio más bajo, con una diferencia no significativa entre los grupos. Los resultados de la prueba de dureza Shore A mostraron que el valor medio más alto se encontró para el grupo de control y los grupos 5% y 6% AEB mostraron valores medios de dureza más bajos.
Conclusión: La incorporación de aceite esencial de bergamota no tuvo efecto sobre la rugosidad de la superficie del revestimiento blando mientras que redujo la dureza de la superficie del material del revestimiento
Electrochemical Analysis of CuO NPs in Artificial Saliva at Different Concentrations, pH, and Scan Rates Using Cyclic Voltammetry
No full textIn this study, the effect of nanoparticles of copper oxide (CuO NPs) dissolved in heat polymerizing acrylic-based soft liner was studied in artificial saliva that was used in the total denture in the mouth was identified, using the electrochemical method, to characterize the extent of the effect of nanoparticles on the oral cavity. Different concentrations (0.3% and 0.5% CuO NPs), pH, scan rates, and reproducibility were studied. The study concluded that the low percentage of 0.3% CuO NPs has less effect than the percentage of 0.5% CuO NPs by redox reaction in the artificial saliva. Furthermore, the acidic pH of the medium has less affected in oxidant that shows reduction peak appeared in the range of pH 2-6, so the nanoparticles of CuO save the acidity of the mouth, while the alkaline pH causes the oxidative effect in the artificial saliva. It can be used the nano copper to improve the chemical properties in the mouth medium
Effect of Aging on the Antifungal Activity and Surface Roughness of Soft Lining Material Incorporated with Chitosan Nano-Particles
No full textBackground: Chitosan is a natural bio-polymer, which has been utilized in different pharmaceutical and biomedical fields, and it has antimicrobial activities. Resilient liner, it’s a polymeric material, considered as a kind of "shock absorber".
Purpose: The purpose of this study is to evaluate the effects of immersion in the artificial saliva on the antifungal activity and surface roughness of heat-polymerized soft lining material impregnated with CHs-NPs.
Approach: 180 specimens were prepared. Divided into 3 groups according to the test: Sensitivity test, viable count test and surface roughness test. Then the specimens subdivided into 3groups depending on the Chitosan addition and the different pH of saliva. The sample’s dimensions for candida viability count test were (10×10×2.3mm) length, width, and thickness, while a plastic disc with dimensions (6 diameter ×0.5mm thickness) for disc diffusion test. For surface roughness test a disc with 30mm diameter and 3mm thickness. The data analyzed statistically using SPSS, (ANOVA) test with Games-Howell test to accept or reject the statistical hypothesis.
Results: For viable count test, there was a significant decrease in CFU/ml of C. albicans after incorporation 3.5%CHs-NPs, the results also showed that the specimens’ group that was stored in acidic artificial saliva, recorded a significant increase in CFU/ml of C. albicans, followed by the specimens’ group that was stored in alkaline artificial saliva. While for disk diffusion test, results showed there was no inhibition zone around any PEMA disks except the experimental group that was stored in neutral artificial saliva. The results of surface roughness, showed no significant difference after incorporation in 3.5% of CHs-NPs into the soft denture liner and immersion in the artificial saliva with different pH levels.
Conclusion: Acidic and alkaline artificial saliva encouraging the growth C. albicans, while the neutral artificial saliva had the least effect. Also, the result of the study concluded that vertex soft lining material impregnated with chitosan nano-particles aids in obtaining a lining material with the antifungal activity against C. albicans. While the aging process and the addition of CHs-NPs was not having a significantly effect on the surface roughness
