scholarly journals Effect of lithium disilicate ceramic thickness, shade and translucency on transmitted irradiance and knoop microhardness of a light cured luting resin cement

2021 ◽  
Vol 32 (8) ◽  
Author(s):  
Lincoln Pires Silva Borges ◽  
Gilberto Antônio Borges ◽  
Américo Bortolazzo Correr ◽  
Jeffrey A. Platt ◽  
Sidney Kina ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Lithium Disilicate ◽  
Resin Cement ◽  
Control Group ◽  
Ceramic Disc ◽  
All Ceramic ◽  
Light Curing ◽  
Knoop Microhardness ◽  
Ceramic Thickness

AbstractThis in vitro study evaluates the influence of pressed lithium disilicate thickness, shade and translucency on the transmitted irradiance and the Knoop microhardness (KHN) of a light-cured resin cement at two depths. One hundred and thirty-five ceramic discs of IPS e.max Press (Ivoclar Vivadent) were fabricated and divided into twenty-seven groups (n = 5) according to the association between translucency: HT (hight translucency), LT (low translucency), and MO (medium opacity); shade: BL2, A1 and A3.5; and thickness: 0.5 mm, 1.5 mm, and 2.0 mm. One side of each ceramic disc was finished, polished and glazed. The irradiance (mW/cm²) of a multiwave LED light curing unit (Valo, Ultradent) was evaluated with a potentiometer (Ophir 10ª-V2-SH, Ophir Optronics) without (control group) or with interposition of ceramic samples. The microhardness of Variolink Esthetic LC resin cement (Ivoclar Vivadent) was evaluated after 24 h at two depths (100 μm and 700 μm). Data were submitted to ANOVA followed by Tukey’s test (α = 0.05). Irradiance and KHN were significantly influenced by ceramic thickness (p < 0.0001), shade (p < 0.001), translucency (p < 0.0001) and depth (p < 0.0001). Conclusions: the interposition of increasing ceramic thicknesses significantly reduced the irradiance and microhardness of resin cement. Increased depth in the resin cement showed significantly reduced microhardness for all studied groups. Increased ceramic opacity reduced the KHN of the resin cement at both depths for all ceramic thicknesses and shades.

scholarly journals Influence of photoactivation protocol and ceramic thickness on mechanical properties of cementation agents

2013 ◽  
Vol 1 (3) ◽  
pp. 253
Author(s):  
Bárbara Malta Neves Oliveira ◽  
Karime Botelho Alves ◽  
Gláucia Maria Bovi Ambrosano ◽  
Débora Alves Nunes leite Lima ◽  
Giselle Maria Marchi Baron ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Load ◽  
Resin Cement ◽  
Control Group ◽  
Low Viscosity ◽  
Halogen Light ◽  
Significant Difference ◽  
Light Curing ◽  
Knoop Microhardness ◽  
Ceramic Thickness

The objective of this work was to evaluate the influence of photoactivation protocol and ceramic thickness on the Knoop microhardness (KHN) and the diametrical tensile strength (DTS) of a dual resin cement (Rely X ARC 3M ESPE (RL)) and a low viscosity composite resin (Filtek Z350 Flow 3M ESPE (Z)). Thereunto, cementation agents were photoactivated under ceramic discs of lithium disilicate with thickness of 1 and 2mm, and a glass slide (control group). The photoactivation was performed with halogen light-curing unit in continuous mode (XL 3000 3M Espe,) (XL) 500 mW/cm2 X 38 s, and with third generation LED light-curing unit (Valo Ultradent) in Standard mode (S) 1000 mW/cm2 X 19 s and Plasma Emulation mode (PE) 3200 mW/cm2 X 6 s, all them providing approximately 19 J/cm2. For KHN measurement, samples (5mm X 1mm) were made (n=8) and submitted to the KHN test on the top surface under a load of 10g applied for 10 seconds. For the DTS (n=8), samples (5mm X 3mm) were made and submitted to a compressive load of 0.5 mm/s until fracture. The data obtained were submitted to the statistical analysis. For KHN, there was statistically significant effect for interactions cementation agent X ceramic thickness, where RL presented higher values of KHN than Z. Comparing inside of cementation agent, RL presented higher values of KHN when photoactivated under 1 mm of ceramic thickness, different from the others. For Z, there was no statistically significant difference between different thickness and the control. The interaction cementation agent X photoactivation protocol was also significant, where for all the photoactivation protocols RL presented higher values of KHN than Z. For the cementation agent there was no significant difference in the values of KHN in all the photoactivation protocols for RL. For Z, the higher values of KHN were obtained by XL protocol and the lower values by S. For DTS, there was significant effect for the interaction cementation agent X photoactivation protocol, where in the photoactivation protocol factor, RL presented higher DTS when photoactivated by XL protocol. For cementation agent factor, the higher values of DTS for RL were obtained with XL, and the lower ones with S. For Z, similar values of DTS were obtained among photoactivation protocols evaluated. It was possible conclude that ceramic thickness and the photoactivation protocols exerted influence on the mechanical properties of  cementation agents evaluated.

scholarly journals Effect of Surface Treatment on the Bond Strength of Quartz Fiber-Reinforced Resin Posts to Resin Cements: In Vitro Study

2017 ◽  
Vol 19 (2) ◽  
pp. 61
Author(s):  
Luis A. Herrera-Ocampo DDS, MSD ◽  
Mauricio Montero-Aguilar DDS, MSc ◽  
Erika Alfaro-Mayorga DDS, MSD
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
In Vitro Study ◽  
Surface Treatments ◽  
Resin Cement ◽  
Control Group ◽  
Quartz Fiber ◽  
Fiber Reinforced ◽  
Resin Cements

The purpose of this study was to determine the effect of different surface treatments on the bond strength between resin cements and quartz fiber-reinforced resin posts. Materials and methods: Sixty quartz fiber-reinforced resin posts (DT Light-Post™, Bisco™) were randomly divided into 12 experimental groups (n=5), according to the resin cement used (Biscem™ or Duolink™) and the surface treatment: Alcohol (control group), silanized, primer, sandblasted, sandblasted + silanized or sandblasted + primer. Cylindrical resin specimens were obtained using nanohybrid resin. The posts were cemented to the resin discs and push-out tests were conducted. Data were analyzed with ANOVA and T test for averages comparison and the Tukey HSD test with a 95% level of significance. Results: Biscem™ cement generally showed higher bond strength when compared to Duolink™ Significant differences were found between the control group and the sandblasted + silane and sandblasted + primer groups when using Duolink™cement. With Biscem™ cement, no differences between groups or with the control group were found.. Conclusion: Surface treatments on quartz fiber-reinforced resin poles seem to have no significant effect on the bond strength to resin cements, except when using Duolink™ cement with sandblasted posts and using silane or primer.

scholarly journals Utilization of Er:YAG Laser in Retrieving and Reusing of Lithium Disilicate and Zirconia Monolithic Crowns in Natural Teeth: An In Vitro Study

2020 ◽  
Vol 10 (12) ◽  
pp. 4357
Author(s):  
Kinga Grzech-Leśniak ◽  
Sompop Bencharit ◽  
Lenart Skrjanc ◽  
Domen Kanduti ◽  
Jacek Matys ◽  
...  
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Er:Yag Laser ◽  
In Vitro Study ◽  
Lithium Disilicate ◽  
Resin Cement ◽  
Retrieval Process ◽  
Human Teeth ◽  
Erbium Doped ◽  
Natural Teeth

The study examined the effect of noninvasive crown retrieval/reuse process using an erbium-doped yttrium aluminum garnet laser (Er:YAG). Twenty-six extracted human teeth were prepared for a crown. The crown was milled using lithium disilicate (LD) and zirconia (Z) materials, n = 13 per group, with three for scanning electron microscopy (SEM). The crown was luted using composite resin cement and subjected to a laser retrieval process. After the retrieval process, the crown was cleaned, re-cemented and laser-retrieved two more times, without and with additional tooth reduction mimicking clinical refreshment of dentin. Retrieval time and temperature were analyzed using analysis of variance (ANOVA). Surface changes were observed through SEM. The retrieval times were 267.1 ± 130.43, 220 ± 79.09, 277.1 ± 126.44, 368.4 ± 136.14, 355 ± 159.39, and 419.2 ± 121.36 s for first, second, third LD and Z groups, respectively (p = 0.009). The maximal temperatures were 23.95.1 ± 1.89 °C, 24.86 ± 2.01 °C, 24.17 ± 1.53 °C, 22.88 ± 1.51 °C, 24.03 ± 1.74 °C, and 21.99 ± 1.32 °C for first, second, third LD and Z groups, respectively (p = 0.006). Er:YAG laser crown removal is an effective retrieval tool for all-ceramic crowns. Minimal changes to teeth and crowns were observed following laser irradiation.

Fracture Resistance of Teeth Restored With All-ceramic Inlays and Onlays: An In Vitro Study

2013 ◽  
Vol 38 (6) ◽  
pp. 626-634 ◽  
Author(s):  
S Saridag ◽  
M Sevimay ◽  
G Pekkan
Keyword(s):  
Fracture Strength ◽  
Glass Ceramic ◽  
Fracture Resistance ◽  
In Vitro Study ◽  
Lithium Disilicate ◽  
Vitro Study ◽  
Zirconia Ceramic ◽  
All Ceramic ◽  
Restorative Materials

SUMMARY Fracture resistance of inlays and onlays may be influenced by the quantity of the dental structure removed and the restorative materials used. The purpose of this in vitro study was to evaluate the effects of two different cavity preparation designs and all-ceramic restorative materials on the fracture resistance of the tooth-restoration complex. Fifty mandibular third molar teeth were randomly divided into the following five groups: group 1: intact teeth (control); group 2: inlay preparations, lithium-disilicate glass-ceramic (IPS e.max Press, Ivoclar Vivadent AG, Schaan, Liechtenstein); group 3: inlay preparations, zirconia ceramic (ICE Zirkon, Zirkonzahn SRL, Gais, Italy); group 4: onlay preparations, lithium-disilicate glass-ceramic (IPS e.max Press); and group 5: onlay preparations, zirconia ceramic (ICE Zirkon). The inlay and onlay restorations were adhesively cemented with dual polymerizing resin cement (Variolink II, Ivoclar Vivadent AG). After thermal cycling (5° to 55°C × 5000 cycles), specimens were subjected to a compressive load until fracture at a crosshead speed of 0.5 mm/min. Statistical analyses were performed using one-way analysis of variance and Tukey HSD tests. The fracture strength values were significantly higher in the inlay group (2646.7 ± 360.4) restored with lithium-disilicate glass-ceramic than those of the onlay group (1673.6 ± 677) restored with lithium-disilicate glass-ceramic. The fracture strength values of teeth restored with inlays using zirconia ceramic (2849 ± 328) and onlays with zirconia ceramic (2796.3 ± 337.3) were similar to those of the intact teeth (2905.3 ± 398.8). In the IPS e.max Press groups, as the preparation amount was increased (from inlay to onlay preparation), the fracture resistance was decreased. In the ICE Zirkon ceramic groups, the preparation type did not affect the fracture resistance results.

scholarly journals Micro-shear bond strength of bioactive cement to translucent zirconia after thermocycyling: a comparative in-vitro study

2020 ◽  
Vol 23 (1) ◽  
Author(s):  
Menna Ahmed ElGendy ◽  
Ihab Mosleh ◽  
Hanaa Zaghloul
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
In Vitro Study ◽  
Resin Cement ◽  
Zirconia Ceramic ◽  
Control Group ◽  
Significant Difference ◽  
Before And After

Objective: the purpose of the study was to evaluate the micro-shear bond strength of different cements to translucent zirconia before and after thermocycling aging. Material and methods: Twelve translucent zirconia ceramic discs were used in the study. Specimens were sandblasted using 50 ‎μm aluminum oxide (Al2O3) particles. The specimens were divided into three groups (n = 4) according to the cement type: Panavia resin cement (control group), resin modified glass ionomer (RMGI), and Activa bioactive cement. Each group was further sub-divided into two equal subgroups (n = 2) according to whether the specimens were subjected to thermocycling or not. Thermocycling was performed in distilled water at 5000 cycles between 5 oC - 55 oC. The micro-shear bond strength test (μSBS) was measured using universal testing machine. Kruskal-Wallis test was used to compare between the three cements. Dunn’s test was used for pair-wise comparisons when Kruskal-Wallis test is significant. Mann-Whitney U test was used to compare between micro-shear bond strength before and after thermocycling P ≤ 0.05. Results: In non-aged subgroups, there was no significant difference between Panavia and Activa; both showed significantly the highest mean μSBS values (22.9 MPa, 31.3 MPa respectively). While, RMGI showed the lowest μSBS values (4.7 MPa).  In thermocycled subgroups, Panavia showed significantly the highest mean μSBS values (32.2 MPa). There was no significant difference between RMGI and Activa; both showed the lowest significant mean μSBS values (3.2 MPa and 8.7 MPa respectively). Conclusions: RMGI and Activa couldn’t be considered long-term reliable materials for cementing zirconia. However, Panavia provided the most durable bond to zirconia.KEYWORDSBioactive cement; Micro-shear bond strength; Resin cement; Translucent zirconia.

scholarly journals The Effect of Commercially Available Desensitizers on Bond Strength Following Cementation of Zirconia Crowns Using Self-Adhesive Resin Cement—An In Vitro Study

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 514
Author(s):  
Harisha Dewan ◽  
Mohammed E. Sayed ◽  
Nasser M. Alqahtani ◽  
Tariq Alnajai ◽  
Abdulaziz Qasir ◽  
...  
Keyword(s):  
Tensile Strength ◽  
In Vitro Study ◽  
Resin Cement ◽  
Control Group ◽  
P Value ◽  
Dentin Hypersensitivity ◽  
Luting Cement ◽  
Zirconia Crowns ◽  
Group 2

The improvement of the tensile strength of zirconia crowns after the application of commercially available desensitizers can provide added advantages for the durability and strength of zirconia prostheses. We assessed the retention of zirconia crowns when Gluma, Shield Force Plus, and Telio CS desensitizers were used with resin luting cement. Four groups with ten specimens each (n = 10) were considered as Group 1 (Control group, with no desensitizer application before crown cementation with resin cement) and Groups 2, 3, and 4 (with a single coat of Gluma dentin desensitizer, Telio CS desensitizer, or Shield Force Plus desensitizer applied before crown cementation, respectively). Thermocycling was then carried out, and each group was tested to determine the associated retentive forces and type of failure. The data were statistically analyzed, which showed that the mean tensile-strength values were significantly higher in Group 2 (p-value = 0.001), Group 3 (p-value = 0.027), and Group 4 (p-value = 0.014), when compared with the Control group. Clinicians should consider the application of any of these three desensitizers, as they can successfully abate dentin hypersensitivity after tooth preparation, as well as increase the durability and strength of the zirconia prosthesis.

scholarly journals Evaluation of the effect of chlorhexidine and sodium hypochlorite in adhesive cementation of fiber posts - in vitro study

2019 ◽  
Vol 48 ◽  
Author(s):  
Tainara CONTE ◽  
Guilherme Schmitt de ANDRADE ◽  
Ana Paula GADONSKI ◽  
Daniella Cristo SANTIN ◽  
Fabiana Scarparo NAUFEL
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Fracture Mode ◽  
Hydrolytic Degradation ◽  
In Vitro Study ◽  
Significant Loss ◽  
Resin Cement ◽  
Control Group ◽  
Hybrid Layer

Abstract Introduction The attachment of fiberglass posts is achieved through an adhesive process. Failures in adhesion may occur due to the hydrolytic degradation of the adhesives, or to the degradation of the collagen fibres of the hybrid layer by intrinsic enzymes. Objective To evaluate the effect of chlorhexidine and sodium hypochlorite treatment on bond strength to dentin. Material and method Thirty bovine roots were randomly distributed into 3 groups (n=10): a) Control, b) 2% Chlorhexidine, and c) 5% Sodium Hypochlorite. Next, RelyX® ARC resin cement was used to cement the post. Each specimen resulted in samples from the three root thirds that were submitted to the pushout test (MPa) at 24 hours and 12 months. Bond strength values were analysed using the Kolmogorov-Smirnov, 3-way ANOVA and Tukey tests. The fracture mode of the pin was also analysed using stereomicroscopy. Result There were no significant differences between treatments at the immediate time (p=0.0644) or in the interaction of factors (p=0.1935). After one year, the experimental groups showed no significant differences in bond strength in relation to the control group, with the exception of the cervical third of the chlorohexidine group in which there was a significant loss of adhesion. As for the fracture mode, there was a predominance of the mixed type in all groups and thirds. Conclusion The use of chlorhexidine or hypochlorite provides neither benefits nor losses in the adhesive bond strength of fiberglass posts. However, there is an influence of the root thirds, with the worst bond strength in the apical third.

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