The Effect of Hydrofluoric Acid Concentration and Heat on the Bonding to Lithium Disilicate Glass Ceramic (original) (raw)
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Research, Society and Development, 2021
The objective of this study to evaluate the effect of different HF concentrations and etching times on the microshear bond strength (μSBS) of LD to resin cement. Forty LD sections (8x8 mm) of 3-mm thickness were randomly distributed (n=10) in accordance with the HF concentration (5 or 10%) and surface etching time (20 or 60 sec). The specimens were silanized and received an air-thinned layer of a light-curable adhesive. Six translucent tubes (0.8-mm diameter and 1-mm height) were positioned over each LD section, filled with resin cement and light-cured. After 24 h of storage, the tubes were carefully removed and the specimens were submitted to the μSBS test. The results submitted to a two-way analysis of variance and Sidak post hoc test (α=.05). Representative HF-etched specimens and one non-etched LD specimen were observed under a field-emission scanning electron microscope. The interaction between the HF concentrations and etching times was not significant (p=0.075). No significant differences were observed regarding HF concentrations and etching times (p=0.06 and p=0.059, respectively). Surfaces of specimens etched with 10% HF for 60 sec were found with grooves and microcracks. The μSBS of LD to resin cement was not significantly influenced by different HF concentrations and etching times; however, the LD surface morphology was found considerably modified.
Brazilian Dental Journal, 2018
This study evaluated the effect of different hydrofluoric acid (HF) concentrations on the bond strength between a lithium disilicate-based glass ceramic and a resin cement. Eighty ceramic-blocks (12×7×2 mm) of IPS e.Max CAD (Ivoclar Vivadent) were produced and randomly assigned to 8 groups, considering 2 study factors: HF concentration in 4 levels, i.e., 1% (HF1), 3% (HF3), 5% (HF5), and 10% (HF10), and storage in 2 levels, i.e., baseline (tests were performed 24 h after cementation), and aged (storage for 150 days + 12,000 thermal-cycles at 5°C and 55°C). Acid etching (20 s) was performed, followed by washing, drying, and silanization. Four resin cement cylinders (ϕ= 0.96 mm) were built-up from starch matrices on each ceramic sample (n= 40). Additional ceramic samples were etched and analyzed for contact angle, micro-morphology, and roughness. In baseline condition (without aging), the HF3, HF5, and HF10 groups showed similar bond strength values (13.9 - 15.9 MPa), and HF1 (11.2 MP...
Egyptian Dental Journal
Purpose: This invitro study investigated the effect of lithium disilicate surface treatment methods and thermocycling condition on the bond strength to resin cement. Material and methods: 12 Lithium disilicate ceramic blocks (7x9x6 mm) were fabricated from IPS e.max CAD blocs. Specimens were allocated in 3 groups (n=4), according to type of surface treatment: Group HFI: etched with 5 % HF acid followed by Monobond plus, Group HFP: etched with 9% HF acid followed by Monobond plus and Group MEP: treated using self-etch primer (Monobond Etch & Prime). Composite blocks of equal size were fabricated and bonded to ceramic blocs using self-adhesive resin cement. Specimens were embedded in acrylic resin blocks then sectioned into beam-shaped specimens (1x1mm). Each group was further subdivided into two subgroups according to aging by thermocycling Subgroup Immediate (I): stored in distilled water at 37 o C For 24 hours then tested immediately and Subgroup Thermocycled (TC): stored then subjected to 5000 thermocycles. The μTBS were presented in MPa and failure mode of debonded specimens were examined by stereomicroscope and SEM to investigate surface characterization. Results: The μTBS mean values ranged between (20.19 and 23.09 Mpa) for (I) subgroups and (14.93 and 15.45 Mpa) for (TC) subgroups. HFP-I showed the highest μTBS (23.09MPa). Thermocycling significantly affected the bond strength results (p=0.001) of all groups. Conclusion: HF Etching of Lithium disilicate with increased concentration followed by silane application is optimal for ceramic/resin bonding. Moreover, Single-bottle self-etch ceramic primer proved to be a good alternative protocol.
European Journal of Dentistry
Objective The study aimed to evaluate the shear bond strength (SBS) of lithium disilicate glass-ceramic (LDGC) and resin cement (RC) using different surface treatments. Materials and Methods LDGC blocks (Vintage LD Press) were prepared, etched with 4.5% hydrofluoric acid, and randomly divided into seven groups (n = 10), depending on the surface treatments. The groups were divided as follows: 1) no surface treatment (control), 2) Silane Primer (KS), 3) Signum Ceramic Bond I (SGI), 4) Signum Ceramic Bond I/Signum Ceramic Bond II (SGI/SGII), 5) experimental silane (EXP), 6) experimental silane/Signum Ceramic Bond II (EXP/SGII), and 7) Experimental/Adper Scotchbond Multi-purpose Adhesive (EXP/ADP). The specimens were cemented to resin composite blocks with resin cement and stored in water at 37 °C for 24 hours. The specimens underwent 5,000 thermal cycles and were subjected to the SBS test. Mode of failure was evaluated under the stereo microscope. Statistical Analysis Data were analyze...
Materials, 2021
The aim of the current study was to evaluate the influence of hydrofluoric (HF) acid concentration and conditioning time on the shear bond strength (SBS) of dual cure resin cement to pressed lithium disilicate ceramic compared to treatment with an Etch and Prime self-etching glass-ceramic primer (EP). A total of 100 samples of pressed lithium disilicate (IPS e.max Press, Ivoclar Vivadent) were randomly divided into five groups (n = 20) according to surface treatment: two different concentrations of HF (5% or 9%), for different durations (20 or 90 s), or treatment with EP. Adhesion of light-cured resin cement to the treated surface was tested by the SBS test. The substrate surfaces of the specimen after failures were examined by SEM. Data were analyzed using Weibull distribution. The highest cumulative failure probability of 63.2% of the shear bond strength (η parameter) values was in the 9% HF −90 s group (17.71 MPa), while the lowest values were observed in the 5% HF −20 s group (7...
Caspian Journal of Dental Research, 2019
Introduction: The use of dental ceramics has increased due to their beauty and biocompatibility. The aim of this study was to evaluate the effect of hydrofluoric acid concentration and etching time on microtensile bond strength (μTBS) of the Enamic and Suprinity ceramics. Materials & Methods: In this in vitro study, two hydrofluoric acid (HFA) concentrations of 5% (A) and 10% (B) were used at the time of 20, 60 and 120 seconds (s) on the Suprinity and Enamic ceramics of CAD/CAM. The etched surfaces were impregnated with silane coupling agent as well as priming and Clearfil SE bond. Then, the Panavia F 2.0 resin cement was applied on the ceramic surfaces and light-cured. There were groups of EA20, EA60, EA120, EB20, EB60, EB120 for Vita Enamic and SA20, SA60, SA120, SB20, SB60, SB120 for Vita Suprinity. The μTBS between resin cement and porcelains was measured with universal testing machine. Mode of failure was observed under the stereo microscope at 40x magnification. Data were analyzed using ANOVA and Chi-square. Results: The μTBS was significantly different between EB20 and EB60 (p=0.008), EB120 and EB20 (p=0.005), SA120 and SB120 (p=0.013), EA120 and EB120 (p=0.002) as well as EA60 and EB60 (p=0.44). In both ceramics, different concentrations and etching times had significant effect on the mean of μTBS (p=0.016). In both ceramics, the time had no effect on the failure mode. For Suprinity ceramic, the HFA concentration had effect on the failure mode (P=0.028). Conclusion: The best surface treatment for Suprinity ceramic is 120 s with 5% HFA and for Enamic is 20 s with 10% HFA, which create the highest bond strength.
Ain Shams Dental Journal
To evaluate microtensile bond strength (µTBS) of two types of resin with different viscosities: High viscosity resin (Flowable composite) and Low viscosity resin (Light cured resin cement) With lithium disilicate discs after two types of surface treatment: Laser etching (Er,Cr:YSGG pulsed laser), hydrofluoric acid etching Materials and Methods: Ceramic slices (n=28) were prepared from IPS Emax CAD/CAM blocks, two surface treatments were applied followed by silane primer: Er,Cr:YSGG laser (group A) and hydrofluoric acid (group B). Two self-adhesive resin cements were injected to the emax specimens using ethelyne tube: flowable composite Z350 (High viscosity resin) sub group (I), mojo veneers resin cement (low viscosity resin) (subgroup II). Thermo-cycling using THE-1100 SD Mechatronics thermocycler was done to simulate the oral cavity media,each bonded micro-cylinder assembly resin was subjected to microtensile bond strength. Data was tabulated and statistically analyzed. Results: HF acid etching & silanation as Surface treatment had a significantly higher (mean±SD) value than Laser surface etching followed by silanation with both high and low viscosities resin. High viscosity resin (flowable composite) should higher bond strength than low viscosity resin (light cure resin cement) but it was statistically insignificant. Conclusions: Acid etching followed by silanation had a significantly higher value than laser etching followed by silanation for both resin viscocities. Resin with high viscosity had a higher value of micro-shear bond strength than resin with low viscosity yet the difference was not significant.
Dental Materials, 2010
d e n t a l m a t e r i a l s 2 6 ( 2 0 1 0 ) 864-872 a v a i l a b l e a t w w w . s c i e n c e d i r e c t . c o m j o u r n a l h o m e p a g e : w w w . i n t l . e l s e v i e r h e a l t h . c o m / j o u r n a l s / d e m a Microtensile bond strength of a resin cement to a novel fluorcanasite glass-ceramic following different surface treatments Fluorcanasite Glass-ceramic Microtensile bond strength Durability Silane HF acid a b s t r a c t Objectives. This study evaluated the effect of surface treatments on the bond strength of fluorcanasite and lithium disilicate glass-ceramics, with the possibility of eliminating HF etching of these ceramics.
In vitro studies to assess bond strength be- tween resins and ceramics have used surfaces that have been ground flat to ensure standard- ization; however, in patients, ceramic surfaces are irregular. The effect of a polished and unpolished ceramic on bond strength needs to be investigated. Sixty ceramic specimens (203532 mm) were made and divided into two groups. One group was ground with 220- to 2000-grit wet silicon carbide paper and pol- ished with 3-, 1-, and 1⁄4-lm diamond paste; the other group was neither ground nor polished. Each group was divided into three subgroups: treated polished controls (PC) and untreated unpolished controls (UPC), polished (PE) and unpolished specimens (UPE) etched with hy- drofluoric acid, and polished (PS) and unpol- ished specimens (UPS) sandblasted with alumina. Resin cement cylinders were built over each specimen. Shear bond strength was measured, and the fractured site was analyzed. Analysis of variance (ANOVA) and Tukey post hoc tests were performed. PE (44.47 6 5.91 MPa) and UPE (39.70 6 5.46 MPa) had the highest mean bond strength. PS (31.05 6 8.81 MPa), UPC (29.11 6 8.11 MPa), and UPS (26.41 6 7.31 MPa) were statistically similar, and PC (24.96 6 8.17 MPa) was the lowest. Hydrofluoric acid provides the highest bond strength re- gardless of whether the surface is polished or not.