Self-etching Primers vs Acid Conditioning: Impact on Bond Strength Between Ceramics and Resin Cement

2018 ◽  
Vol 43 (4) ◽  
pp. 372-379 ◽  
Author(s):  
JPM Tribst ◽  
LC Anami ◽  
M Özcan ◽  
MA Bottino ◽  
RM Melo ◽  
...  
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Cement Composite ◽  
Resin Cement ◽  
The Self ◽  
Water Cooling ◽  
Ceramic Blocks ◽  
Microtensile Test ◽  
Diamond Saw

SUMMARY This study tested whether a self-etching surface agent and the conventional hydrofluoric acid (HF) would provide the same bonding capacity between resin cement and feldspathic (Fd) and lithium disilicate (Ld) ceramics. Ceramic blocks were cut with a low-speed diamond saw with water cooling (Isomet 1000, Buehler, Lake Bluff, IL, USA) into 20 blocks of 5 × 7 × 4 mm, which were ground flat in a polishing machine (EcoMet/AutoMet 250, Buehler) under water cooling. The blocks were randomly divided into eight groups (n=5), according to ceramic type (Ld or Fd), surface conditioning (HF + Monobond Plus or Etch and Prime), and aging by thermocycling (TC or absence-baseline). After 24 hours in 37°C distilled water, blocks were embedded into acrylic resin and 1-mm2 cross-section beams composed of ceramic/cement/composite were obtained. The microtensile test was performed in a universal testing machine (DL-1000, EMIC, São José dos Campos, Brazil; 0.5 mm.min−1, 50 kgf load cell). Bond strength (MPa) was calculated by dividing the load at failure (in N) by the bonded area (mm2). The fractured specimens were examined under stereomicroscopy, and one representative sample of each group was randomly selected before the cementation and was further used for analysis using scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS). The self-etching agent showed the highest bond strength for Fd (24.66±4.5) and Ld (24.73±6.9) ceramics and a decrease in surface wettability. SEM and EDS showed the presence of similar components in the tested materials with different topographies for both. Therefore, the self-etching primer was able to deliver even higher bonding than HF+silane to a resin cement.

scholarly journals Effect of Provisional Cements on Shear Bond Strength of Porcelain Laminate Veneers

2011 ◽  
Vol 05 (04) ◽  
pp. 373-379 ◽  
Author(s):  
Subutay Han Altintas ◽  
Onjen Tak ◽  
Asli Secilmis ◽  
Aslihan Usumez
Keyword(s):  
Bond Strength ◽  
Calcium Hydroxide ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Resin Cement ◽  
Control Group ◽  
Molar Teeth ◽  
Laminate Veneers ◽  
Selection Of

ABSTRACTObjectives: The purpose of this study was to evaluate the effect of three provisional cements and two cleaning techniques on the final bond strength of porcelain laminate veneers. Methods: The occlusal third of the crowns of forty molar teeth were sectioned and embedded in autopolymerizing acrylic resin. Dentin surfaces were polished and specimens were randomly divided into four groups (n=10). Provisional restorations were fabricated and two provisional restorations were cemented onto each tooth. Restorations were fixed with one of three different provisional cements: eugenol-free provisional cement (Cavex), calcium hydroxide (Dycal), and light-cured provisional cement (Tempond Clear). Provisional restorations were removed with either a dental explorer and air-water spray, or a cleaning bur (Opticlean). In the control group, provisional restorations were not used on the surfaces of specimens. IPS Empress 2 ceramic discs were luted with a dual-cured resin cement (Panavia F). Shear bond strength was measured using a universal testing machine. Data were statistically analyzed by ANOVA, Tukey’s HSD and Dunnett tests. Surfaces were examined by scanning electronic microscopy. Results: Significant differences were found between the control group and both the light-cured provisional cement groups and the eugenol-free provisional cement-cleaning bur group (P<.05). Groups that had received light-cured provisional cement showed the lowest bond strength values. Conclusions: Selection of the provisional cement is an important factor in the ultimate bond strength of the final restoration. Calcium hydroxide provisional cement and cleaning with a dental explorer are advisable. (Eur J Dent 2011;5:373-379)

scholarly journals Effect of Ceramic Etching Protocols on Resin Bond Strength to a Feldspar Ceramic

2015 ◽  
Vol 40 (2) ◽  
pp. E40-E46 ◽  
Author(s):  
MA Bottino ◽  
A Snellaert ◽  
CD Bergoli ◽  
M Özcan ◽  
MC Bottino ◽  
...  
Keyword(s):  
Bond Strength ◽  
Resin Cement ◽  
Acid Etching ◽  
Ceramic Surface ◽  
Mean Values ◽  
Force Microscopy ◽  
Ceramic Surfaces ◽  
Aging Conditions ◽  
Ceramic Blocks ◽  
Microtensile Test

SUMMARY This study sought to evaluate the resin microtensile bond strength (MTBS) stability of a leucite-reinforced ceramic after different ceramic etching protocols. The microtensile test had 40 ceramic blocks (5×5×6 mm) assigned to five groups (n=8), in accordance with the following surface etching protocols: NE nonetched (control); 9HF: hydrofluoric (HF) acid etching (9%HF)+wash/dry; 4HF: 4%HF+wash/dry; 5HF: 5%HF+wash/dry; and 5HF+N: 5%HF+neutralizer+wash/dry+ultrasonic-cleaning. Etched ceramic surfaces were treated with a silane agent. Next, resin cement blocks were built on the prepared ceramic surface and stored for 24 hours in distilled water at 37°C. The specimens were then sectioned to obtain microtensile beams (32/block), which were randomly assigned to the following conditions, nonaged (immediate test) and aged (water storage for 150 days plus 12,000 thermal cycles), before the microtensile test. Bond strength data were submitted to one-way analysis of variance and Tukey test (α=0.05). Additional ceramic samples were subjected to the different ceramic etching protocols and evaluated using a scanning electron microscope (n=2) and atomic force microscopy (n=2). Aging led to a statistically significant decrease in the MTBS for all groups, except the untreated one (NE). Among the groups submitted to the same aging conditions, the untreated (NE) revealed inferior MTBS values compared to the 9HF and 4HF groups. The 5HF and 5HF+N groups had intermediate mean values, being statistically similar to the higher values presented by the 9HF and 4HF groups and to the lower value associated with the NE group. The neutralization procedure did not enhance the ceramic/resin cement bond strength. HF acid etching is a crucial step in resin/ceramic bonding.

scholarly journals A Twofold Comparison between Dual Cure Resin Modified Cement and Glass Ionomer Cement for Orthodontic Band Cementation

2016 ◽  
Vol 4 (4) ◽  
pp. 695-699
Author(s):  
Hanaa El Attar ◽  
Omnia Elhiny ◽  
Ghada Salem ◽  
Ahmed Abdelrahman ◽  
Mazen Attia
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Acrylic Resin ◽  
Resin Cement ◽  
Materials Testing ◽  
Glass Ionomer ◽  
Ionomer Cement ◽  
Modified Resin

AIM: To test the solubility of dual cure resin modified resin cement in a food simulating solution and the shear bond strength compared to conventional Glass ionomer cement.MATERIALS AND METHOD: The materials tested were self-adhesive dual cure resin modified cement and Glass Ionomer (GIC). Twenty Teflon moulds were divided into two groups of tens. The first group was injected and packed with the modified resin cement, the second group was packed with GIC. To test the solubility, each mould was weighed before and after being placed in an analytical reagent for 30 days. The solubility was measured as the difference between the initial and final drying mass. To measure the Shear bond strength, 20 freshly extracted wisdom teeth were equally divided into two groups and embedded in self-cure acrylic resin. Four mm sections of stainless steel bands were cemented to the exposed buccal surfaces of teeth under a constant load of 500 g. Shear bond strength was measured using a computer controlled materials testing machine and the load required to deband the samples was recorded in Newtons.RESULTS: GIC showed significantly higher mean weight loss and an insignificant lower Shear bond strength, compared to dual cure resin Cement.CONCLUSION: It was found that dual cure resin modified cement was less soluble than glass ionomer cement and of comparable bond strength rendering it more useful clinically for orthodontic band cementation.

scholarly journals Dentin bond strength of bioactive cement in comparison to conventional resin cement when photosensitized with Er,Cr:YSGG Laser

2019 ◽  
Vol 36 (2) ◽  
Author(s):  
Fahad Alkhudhairy ◽  
Sulieman S. Al-Johany ◽  
Mustafa Naseem ◽  
Mohammed Bin-Shuwaish ◽  
Fahim Vohra
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
In Vitro Study ◽  
Acrylic Resin ◽  
Resin Cement ◽  
Significance Level ◽  
Creative Commons ◽  
Modes Of Failure ◽  
Post Hoc

Objective: The purpose of the present study was to assess dentin shear bond strength (SBS) and mode of bond failure of bioactive cement (BA) in comparison to conventional resin cement when photosensitized by Er,Cr:YSGG Laser (ECL). Methods: The present in-vitro study was carried out from March 2019 to May 2019. Sixty permanent non-carious, intact, non-fractured molars were isolated and mounted vertically in acrylic resin. Buccal surface of each molar tooth was ground, polished and surface treated with ECL. Ketac conditioner was applied on the surface washed and air dried surface. Tetric -N-Bond adhesive was applied on forty-five samples and light cured. The specimens were allocated into four groups (n=15) according to the type of cement used i.e., Calibra (C), BA, Variolink II (V) and Maxcem-Elite (ME). For SBS testing was performed using the universal testing machine. Eight samples from each group were assessed for modes of failure. Means and standard deviations were compared using analysis of variance (ANOVA) and Tukey’s post hoc test at a significance level of p < 0.05. Results: The highest mean SBS was observed in group ECL-C (21.55±3.08). The lowest mean SBS was displayed in group ECL-ME (14.25±3.55). Mean SBS values for group ECL-C (21.55±3.08) and group ECL-V (20.74±4.15) were comparable (p <0.05). Similarly, SBS values of group ECL-BA (15.48±3.62) and group ECL-ME (14.25±3.55) were comparable (p <0.05). Conclusion: Dentin surface conditioned with Er,Cr:YSGG and bonded to C and V cements exhibit favourable bond strength values. doi: https://doi.org/10.12669/pjms.36.2.1284 How to cite this:Alkhudhairy F, Al-Johany SS, Naseem M, Bin-Shuwaish M, Vohra F. Dentin bond strength of bioactive cement in comparison to conventional resin cement when photosensitized with Er,Cr:YSGG Laser. Pak J Med Sci. 2020;36(2):---------.   doi: https://doi.org/10.12669/pjms.36.2.1284 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals Study of thermocycling effect on the bond strength between an aluminous ceramic and a resin cement

2005 ◽  
Vol 13 (1) ◽  
pp. 53-57 ◽  
Author(s):  
Osvaldo Daniel Andreatta Filho ◽  
Maria Auxiliadora Junho de Araújo ◽  
Marco Antonio Bottino ◽  
Renato Sussumu Nishioka ◽  
Marcia Maciel Menezes
Keyword(s):  
Bond Strength ◽  
Statistical Difference ◽  
Composite Resin ◽  
Testing Machine ◽  
Resin Cement ◽  
Distilled Water ◽  
Mean Values ◽  
Universal Testing ◽  
Adhesive Surface ◽  
Ceramic Blocks

This study evaluated the effect of thermocycling on the bond strength between Procera AllCeram (Nobel-Biocare) and a resin cement (Panavia F, Kuraray CO). Nine ceramic blocks with dimensions of 5x6x6mm were conditioned at one face with Rocatec System (Espe). After, they were luted with Panavia F to composite resin blocks (Clearfil AP-X, Kuraray CO). The nine groups formed by ceramic, cement and composite resin were split up obtaining 75 samples with dimensions of 12x1x1mm and adhesive surface presenting 1mm²±0.1mm² of area. The samples were divided into 3 groups (n=25): G1 - 14 days in distilled water at 37ºC; G2 - 6,000 cycles in water (5ºC - 55ºC - 30s); G3 - 12,000 cycles in water (5ºC - 55ºC - 30s). The samples were tested in a universal testing machine (EMIC) at a crosshead speed of 1mm/min. Data were analyzed by ANOVA and Tukey tests. The results indicated that mean values of rupture tension (MPa) of G1 (10.71 ± 3.54) did not differ statistically (p <5%) from G2 (9.01 ± 3.90), however there was statistical difference between G1 and G3 (7.28 ± 3.00). It was concluded that thermocycling significantly reduced the bond strength values when samples were submitted to 12,000 cycles.

scholarly journals Evaluation of self-etching primer on bond strength in feldspathic ceramic

2021 ◽  
Vol 10 (5) ◽  
pp. e33110514572
Author(s):  
Nathalia Eduardo Sgrott ◽  
Renata Bahia Accioly Lins ◽  
Isaias Donizeti Silva ◽  
Laura Soares Souto Lepesqueur ◽  
Karina Andrea Novaes Olivieri ◽  
...  
Keyword(s):  
Bond Strength ◽  
Storage Time ◽  
Composite Resin ◽  
Cement Composite ◽  
Failure Pattern ◽  
Water Cooling ◽  
Microtensile Bond Strength ◽  
Ceramic Blocks ◽  
Interface Line

The aim of the study was to evaluate the effect of self-etching silane primer on long-term bonding strength on feldspathic ceramic. Ceramic blocks (IPS Empress CAD, Ivoclar Vivadent) were cut with a low-speed diamond disk (Isomet 1000, Buehler) into 40 blocks of 12x7x6mm, under water cooling, and randomly divided into two groups (n=20), according to the surface conditioning: hydrofluoric acid (HF) (Condac, FGM) or self-etching silane primer (MEP) (Monobond Etch and Prime, Ivoclar Vivadent). After the blocks were bonded to composite resin blocks (12 x 7 x 3mm) (Liss, FGM) with a light cured cement (Variolink Esthetic LC, Ivoclar Vivadent) and LED photoactivation (Radii Cal, SDI) for 40 s on each luting interface line. The sets were cut in sticks with 1-mm2 cross-section composed of ceramic/cement/composite and tested after 24h (baseline) and 90 days aging by stored in distilled water at 37ºC. Microtensile bond strength testing (mTBS) was performed using a universal machine (DL-1000, EMIC) submitted to traction with speed of 0.5mm/ min until rupture of adhesion. Fracture of specimens were examined under stereomicroscopy to determine the failure pattern. Bond strength (MPa) was calculated, and the failure pattern and interface topography were assessed using scanning electron microscopy (SEM). No significant different mTBS was observed between groups HF and MEP (p>0.05). Storage time of the samples did not affect the mTBS from the groups.  Surface etching pattern with HF produced higher surface alterations than a self-etching primer. Application of MEP may be considered an alternative for silanization for feldspathic ceramic.

scholarly journals Heat Treatment of Pre-hydrolyzed Silane Increases Adhesion of Phosphate Monomer-based Resin Cement to Glass Ceramic

2015 ◽  
Vol 26 (1) ◽  
pp. 44-49 ◽  
Author(s):  
Rodrigo Furtado de Carvalho ◽  
Caroline Cotes ◽  
Estevão Tomomitsu Kimpara ◽  
Fabíola Pessoa Pereira Leite
Keyword(s):  
Heat Treatment ◽  
Bond Strength ◽  
Glass Ceramic ◽  
Testing Machine ◽  
Sem Analysis ◽  
Resin Cement ◽  
Control Group ◽  
Microtensile Bond Strength ◽  
Hot Air ◽  
Ceramic Blocks

This study evaluated the influence of different forms of heat treatment on a pre-hydrolyzed silane to improve the adhesion of phosphate monomer-based (MDP) resin cement to glass ceramic. Resin and feldspathic ceramic blocks (n=48, n=6 for bond test, n=2 for microscopy) were randomly divided into 6 groups and subject to surface treatments: G1: Hydrofluoric acid (HF) 9.6% for 20 s + Silane + MDP resin cement (Panavia F); G2: HF 9.6% for 20 s + Silane + Heat Treatment (oven) + Panavia F; G3: Silane + Heat Treatment (oven) + Panavia F; G4: HF 9.6% for 20 s + Silane + Heat Treatment (hot air) + Panavia F; G5: Silane + Heat Treatment (hot air) + Panavia F; G6: Silane + Panavia F. Microtensile bond strength (MTBS) test was performed using a universal testing machine (1 mm/min). After debonding, the substrate and adherent surfaces were analyzed using stereomicroscope and scanning electron microscope (SEM) to categorize the failure types. Data were analyzed statistically using two-way test ANOVA and Tukey's test (=0.05). Heat treatment of the silane containing MDP, with prior etching with HF (G2: 13.15±0.89a; G4: 12.58±1.03a) presented significantly higher bond strength values than the control group (G1: 9.16±0.64b). The groups without prior etching (G3: 10.47±0.70b; G5: 9.47±0.32b) showed statistically similar bond strength values between them and the control group (G1). The silane application without prior etching and heat treatment resulted in the lowest mean bond strength (G6: 8.05±0.37c). SEM analysis showed predominantly adhesive failures and EDS analysis showed common elements of spectra (Si, Na, Al, K, O, C) characterizing the microstructure of the glass-ceramic studied. Heat treatment of the pre-hydrolyzed silane containing MDP in an oven at 100 °C for 2 min or with hot air application at 50±5 ºC for 1 min, was effective in increasing the bond strength values between the ceramic and resin cement containing MDP.

scholarly journals The effect of metal surface treatment on bond strength interface between metal/cement

2015 ◽  
Vol 18 (4) ◽  
pp. 43
Author(s):  
Osvaldo Daniel Andreatta-Filho ◽  
Vinícius Anéas Rodrigues ◽  
Alexandre Luiz Souto Borges ◽  
Paula Carolina Komori de Carvalho ◽  
Renato Sussumu Nishioka
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Testing Machine ◽  
Constant Load ◽  
Surface Treatments ◽  
Resin Cement ◽  
Nickel Chromium ◽  
Microtensile Test ◽  
Bond Strengths ◽  
Oxide Particles

<p class="western" align="justify"><span style="font-family: 'Times New Roman', serif;"><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Objective</strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US">: This study evaluated the hypothesis that different treatments of surface upon three metal alloys for metal ceramic dental prostheses (Gold; Nickel-Chromium; Titanium) do not Influence the values of bond strength with resin cement. </span></span><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Material and Methods:</strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US"> Twenty blocks, 5x5x5 mm, of each alloy were divided into two subgroups (n = 10) according to surface treatments: 1 (Primer): sandblasting with aluminum oxide particles 110 µm (Al</span></span><sub><span style="font-family: Arial, serif;"><span lang="en-US">2</span></span></sub><span style="font-family: Arial, serif;"><span lang="en-US">O</span></span><sub><span style="font-family: Arial, serif;"><span lang="en-US">3</span></span></sub><span style="font-family: Arial, serif;"><span lang="en-US">) + Alloy Primer (Kuraray); 2 (Cojet): sandblasting with silica oxide particles with Cojet-Sand + Silane ESPE-Sil. The conditioned blocks of each group were cemented, with Panavia F, to resin blocks under constant load of 750 g/10 min. The sets were cut to obtain 4 samples with dimensions of 10x1x1 mm per block (n = 10) and the adhesive surface with approximately 1 mm</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">2</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">. The microtensile test was done in the universal testing machine at 1 mm/min crosshead speed. The values of bond strength and standard deviation (MPa) were: Au P: 7.33 ± 1.93</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">d</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; Au C: 13.35 ± 2.18</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">c</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; NiCr P: 23.56 ± 6.5</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">b</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; NiCr C: 42.6 ± 5.84</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">a</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; Ti P: 26.17 ± 1.94</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">b</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; Ti C: 44.30 ± 2.3</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">a</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">. Data were analyzed by variance test (ANOVA) and Tukey’s test, p &lt; 0.05. </span></span><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Results: </strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US">The results indicated that the conditioning with treatment 2 increased the bond strength between the resin cement and alloys. The lowest bond strengths values were obtained with gold alloy, regardless the surface treatment. </span></span><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Conclusion:</strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US"> The results denied the hypothesis that the metallic alloys surface treatments do not alter the bond strengths values.</span></span></span></p>

Effect of Hydrofluoric Acid Concentration and Etching Time on Bond Strength to Lithium Disilicate Glass Ceramic

2017 ◽  
Vol 42 (6) ◽  
pp. 606-615 ◽  
Author(s):  
J Puppin-Rontani ◽  
D Sundfeld ◽  
AR Costa ◽  
AB Correr ◽  
RM Puppin-Rontani ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Ceramic ◽  
Hydrofluoric Acid ◽  
Surface Characterization ◽  
Testing Machine ◽  
Lithium Disilicate ◽  
Resin Cement ◽  
Etching Time ◽  
Failure Data ◽  
Ceramic Blocks

SUMMARY The aim of this study was to evaluate the influence of different concentrations of hydrofluoric acid (HF) associated with varied etching times on the microshear bond strength (μSBS) of a resin cement to a lithium disilicate glass ceramic. Two hundred seventy-five ceramic blocks (IPS e.max Press [EMX], Ivoclar Vivadent), measuring 8 mm × 3 mm thickness, were randomly distributed into five groups according to the HF concentrations (n=50): 1%, 2.5%, 5%, 7.5%, and 10%. Further random distribution into subgroups was performed according to the following etching times (n=10): 20, 40, 60, 120, and 20 + 20 seconds. After etching, all blocks were treated with a silane coupling agent followed by a thin layer of an unfilled resin. Three resin cement cylinders (∅︀=1 mm) were made on each EMX surface, which was then stored in deionized water at 37°C for 24 hours before testing. The μSBS was in a universal testing machine at a crosshead speed of 1 mm/min until failure. Data were submitted to two-way analysis of variance, and multiple comparisons were performed using the Tukey post hoc test (α=0.05). One representative EMX sample was etched according to the description of each subgroup and evaluated using scanning electron microscopy for surface characterization. The HF concentrations of 5%, 7.5%, and 10% provided significantly higher μSBS values than 1% and 2.5% (p&lt;0.05), regardless of the etching times. For 1% and 2.5% HF, the etching times from 40 to 120 seconds increased the μSBS values compared with 20 seconds (p&lt;0.05), but etching periods did not differ within the 5%, 7.5%, and 10% HF groups (p&gt;0.05). The effect of re-etching was more evident for 1% and 2.5% HF (p&lt;0.05). Different HF concentrations/etching times directly influenced the bond strength and surface morphology of EMX.

scholarly journals The Effect of Hydrofluoric Acid Concentration on the Bond Strength and Morphology of the Surface and Interface of Glass Ceramics to a Resin Cement

2015 ◽  
Vol 40 (5) ◽  
pp. 470-479 ◽  
Author(s):  
D Sundfeld Neto ◽  
LZ Naves ◽  
AR Costa ◽  
AB Correr ◽  
S Consani ◽  
...  
Keyword(s):  
Bond Strength ◽  
Hydrofluoric Acid ◽  
Testing Machine ◽  
Glass Ceramics ◽  
Resin Cement ◽  
Interface Morphology ◽  
Ceramic Block ◽  
Surface And Interface ◽  
Ceramic Blocks ◽  
Post Hoc

SUMMARY The purpose of this study was to evaluate the influence of various concentrations of hydrofluoric acid (HF) on the surface/interface morphology and μ–shear bond strength (μSBS) between IPS Empress Esthetic (EST) (Ivoclar Vivadent) and IPS e.max Press (EMX) (Ivoclar Vivadent) ceramics and resin cement. Ceramic blocks were divided into 12 groups for each kind of ceramic. Six different HF concentrations were evaluated: 1%, 2.5%, 5%, 7.5%, 10%, and 15%. All groups were silanated after etching, and half of the specimens within each group received a thin layer of unfilled resin (UR). Three resin cement cylinders were prepared on each ceramic block for μSBS testing. The specimens were stored in distilled water at 37°C for 24 hours. The μSBS test was carried out in a universal testing machine at a crosshead speed of 0.5 mm/min until fracture. The data were submitted to three-way analysis of variance and multiple comparisons were performed using the Tukey post hoc test (p&lt;0.05). The etched surfaces and bonded interfaces were evaluated using scanning electron microscopy. μSBS means (MPa) for 1%, 2.5%, 5%, 7.5%, 10%, and 15% HF concentrations were, respectively, 25.2, 27.2, 30.1, 31.4, 33.3, and 31.8. μSBS means with or without UR application measured 32.24 and 27.4, respectively; EST and EMX measured 29.8 and 29.9, respectively. For the HF concentrations, 10% and 15% showed higher μSBS means than did 1% and 2.5% (p&lt;0.05); 7.5% was higher than 1% (p&lt;0.05); and no statistical differences were found among the other concentrations (p&gt;0.05). When evaluating UR, μSBS mean was significantly higher and better infiltration was observed on the etched surfaces. No statistical difference was found between the ceramics. The HF concentration and UR influenced the bond strength and surface/interface morphology.

Sign in / Sign up

Export Citation Format

Share Document