Effect of Radiotherapy on Microleakage of Two Different Types of Glass Ionomer

2015 ◽  
Vol 18 (1) ◽  
pp. 39-48
Author(s):  
Lamia Nabil Metwally ◽  
Mokhtar Nagui Ibrahim ◽  
Omaima Hassan Ghallab
Keyword(s):  
Glass Ionomer ◽  
Different Types

Shear bond strength of glass ionomer and resin‐based cements to different types of zirconia

2020 ◽  
Vol 32 (8) ◽  
pp. 806-814
Author(s):  
Francesco De Angelis ◽  
Camillo D'Arcangelo ◽  
Matteo Buonvivere ◽  
Giuseppe Daniele Rondoni ◽  
Mirco Vadini
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Glass Ionomer ◽  
Different Types

scholarly journals Cuspal Deflection in Premolar Teeth Restored Using Current Composite Resins With and Without Resin-modified Glass Ionomer Liner

2013 ◽  
Vol 38 (3) ◽  
pp. 282-289 ◽  
Author(s):  
E Karaman ◽  
G Ozgunaltay
Keyword(s):  
Composite Resin ◽  
Glass Ionomer Cement ◽  
Composite Resins ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Different Types ◽  
Before And After ◽  
Composite Resin Restorations ◽  
Ionomer Cement

SUMMARY Aim: To evaluate the effects of four different types of composite resins and a resin modified glass ionomer cement (RMGIC) liner on the cuspal deflection of large MOD cavities in vitro. Materials & Methods: One hundred twenty-eight extracted human upper premolar teeth were used. After the teeth were divided into eight groups (n=16), standardized large MOD cavities were prepared. The distance between cusp tips was measured before and after the cavity preparations with a digital micrometer. Then the teeth were restored with different resin composites (Filtek Supreme XT, Filtek P60, Filtek Z250, Filtek Silorane - 3M ESPE, St Paul, MN, USA) with and without a RMGIC liner (Vitrebond, 3M ESPE, St Paul, MN, USA). Cuspal deflection was measured 5 min, 24 h, and 48 h after the completion of restorations. The data were statistically analyzed with Friedman and Kruskal Wallis tests. Results: A significant reduction in cuspal deflection was observed in Filtek Silorane restorations with and without RMGIC liner (p<0.05). In all restored teeth, the distance between cusps was reduced but they did not return to their original positions during the 48 h period. All teeth showed cuspal deflection, but placement of RMGIC liner reduced it. Conclusion: The use of silorane-based composites and the placement of RMGIC liner under the composite resin restorations resulted in significantly reduced cuspal deflection.

The Incorporation of Nanoparticles into Conventional Glass-Ionomer Dental Restorative Cements

2015 ◽  
Vol 21 (2) ◽  
pp. 392-406 ◽  
Author(s):  
Elizabeta Gjorgievska ◽  
Gustaaf Van Tendeloo ◽  
John W. Nicholson ◽  
Nichola J. Coleman ◽  
Ian J. Slipper ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Zirconium Oxide ◽  
Cement Matrix ◽  
Glass Ionomer ◽  
Air Voids ◽  
Promising Strategy ◽  
Significant Difference ◽  
Different Types ◽  
The Matrix ◽  
Dental Restorative

AbstractConventional glass-ionomer cements (GICs) are popular restorative materials, but their use is limited by their relatively low mechanical strength. This paper reports an attempt to improve these materials by incorporation of 10 wt% of three different types of nanoparticles, aluminum oxide, zirconium oxide, and titanium dioxide, into two commercial GICs (ChemFil® Rock and EQUIA™ Fil). The results indicate that the nanoparticles readily dispersed into the cement matrix by hand mixing and reduced the porosity of set cements by filling the empty spaces between the glass particles. Both cements showed no significant difference in compressive strength with added alumina, and ChemFil® Rock also showed no significant difference with zirconia. By contrast, ChemFil® Rock showed significantly higher compressive strength with added titania, and EQUIA™ Fil showed significantly higher compressive strength with both zirconia and titania. Fewer air voids were observed in all nanoparticle-containing cements and this, in turn, reduced the development of cracks within the matrix of the cements. These changes in microstructure provide a likely reason for the observed increases in compressive strength, and overall the addition of nanoparticles appears to be a promising strategy for improving the physical properties of GICs.

scholarly journals Microshear Bond Strength of Nanoparticle-Incorporated Conventional and Resin-Modified Glass Ionomer to Caries-Affected Dentin

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Zahra Fattah ◽  
Zahra Jowkar ◽  
Safoora Rezaeian
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Bond Strength ◽  
Glass Ionomer Cement ◽  
The Other ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Different Types ◽  
Microshear Bond Strength ◽  
Ionomer Cement

The purpose of this study was to assess the influence of three different types of nanoparticles (silver (SNPs), titanium dioxide (TNPs), and zinc oxide (ZNPs)) on the microshear bond strength of conventional glass ionomer cement (CGIC) and resin-modified glass ionomer cement based on whether CGIC or RMGIC is used with four subgroups (based on the incorporation of SNPs, ZNPs, and TNPs in addition to a control subgroup) (n = 12) as follows: CGIC, CGIC + TNP, CGIC + ZNP, CGIC + SNP, RMGIC, RMGIC + TNP, RMGIC + ZNP, and RMGIC + SNP. After 24 hours, the μSBS of specimens was tested and the obtained data were analyzed using two-way ANOVA and Tukey’s HSD test. The obtained results showed that the incorporation of TNPs in two glass ionomers was not statistically significant compared with the control subgroups ( p  > 0.05). In the first group, the highest and lowest mean μSBS were, respectively, observed in the CGIC + SNP subgroup and CGIC + ZNP subgroup. In the second group, RMGIC + ZNP and RMGIC + SNP, respectively, showed the highest and lowest mean μSBS compared to the other subgroups. According to the results, it can be concluded that TNPs can be incorporated into both CGIC and RMGIC without compromising the bond strength of glass ionomers. SNPs and ZNPs can be, respectively, added to CGICs and RMGICs to improve the bond strength of the restoration.

The extinction time of a general birth and death process with catastrophes

1986 ◽  
Vol 23 (04) ◽  
pp. 851-858 ◽  
Author(s):  
P. J. Brockwell
Keyword(s):  
Laplace Transform ◽  
Size Distribution ◽  
Sufficient Conditions ◽  
Necessary And Sufficient Conditions ◽  
Death Process ◽  
Extinction Time ◽  
Birth And Death Process ◽  
Different Types ◽  
The Laplace Transform ◽  
Necessary And Sufficient

The Laplace transform of the extinction time is determined for a general birth and death process with arbitrary catastrophe rate and catastrophe size distribution. It is assumed only that the birth rates satisfyλ0= 0,λj> 0 for eachj> 0, and. Necessary and sufficient conditions for certain extinction of the population are derived. The results are applied to the linear birth and death process (λj=jλ, µj=jμ) with catastrophes of several different types.

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