scholarly journals Effects of Different Laser Treatments on Some Properties of the Zirconia-Porcelain Interface

2021 ◽  
Vol 12 ◽  
pp. e2-e2
Author(s):  
Abdulsatar M Abdulsatar ◽  
Basima M A Hussein ◽  
Ali M Mahmood
Keyword(s):  
Surface Roughness ◽  
Bond Strength ◽  
Surface Treatment ◽  
Co2 Laser ◽  
Nd:Yag Laser ◽  
Light Microscope ◽  
Shear Bond Strength ◽  
Control Group ◽  
Fractional Co2 Laser ◽  
Laser Treatments

Introduction: This study was performed to compare the effect of Fractional CO2 laser or Q switched Nd:YAG laser of surface treatment on the shear bond strength of zirconia-porcelain interface. Methods: Fractional CO2 laser at 30 W, 2 ms, time interval 1 ms, distance between spots 0.3 mm, and number of scans is (4) or Q switched Nd:YAG laser at 30 J/mm2 and 10 Hz were used to assess the shear bond strength of zirconia to porcelain. Pre-sintered zirconia specimens were divided into three groups (n = 10) according to the surface treatment technique used: (a) untreated (Control) group; (b) CO2 group; (c) Nd:YAG group. All samples were then sintered and veneered with porcelain according to the manufacturer’s instructions. Surface morphology was examined using a light microscope, the surface roughness test was done by the atomic force microscope (AFM), and the shear bond strength (SBS) test was done by a universal testing machine. After debonding following shear bond test, zirconia surfaces were examined under a light microscope to determine their fracture mode. Results: The Results of this study showed that the lowest SBS was recorded in the control group, and the highest SBS recorded in the Fractional CO2 group, followed by the Q switched Nd:YAG laser group, as well as an increase in surface roughness and change in the morphology and mode of failure in the experimental groups . Conclusion: This study shows that Fractional CO2 laser and Q switched Nd:YAG laser treatments significantly increase the bond strength than untreated zirconia .

scholarly journals Surface treatment with a fractional CO2 laser enhances shear bond strength of resin cement to zirconia

LASER THERAPY ◽  
2016 ◽  
Vol 25 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Farzaneh Ahrari ◽  
Alireza Boruziniat ◽  
Mehrnoosh Alirezaei
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Co2 Laser ◽  
Shear Bond Strength ◽  
Resin Cement ◽  
Fractional Co2 Laser

scholarly journals Influence of Silver Nanoparticles on the Specific Properties of Acrylic Resin for Ocular Prosthesis

2018 ◽  
Vol 11 (3) ◽  
pp. 1573-1581 ◽  
Author(s):  
Maha M. Turki ◽  
Faiza M. Abdul-Ameer
Keyword(s):  
Surface Roughness ◽  
Impact Strength ◽  
Flexural Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Acrylic Resin ◽  
Control Group ◽  
Mean Values ◽  
The Mean ◽  
Group B

Scleral acrylic resin is widely used to synthesize ocular prosthesis. However, the properties of this material change over time, thus requiring the prosthesis to be refabricated. Many studies were conducted to improve these properties by reinforcing this material with nanoparticles. This study aims to evaluate the effect of silver nanoparticle powder on the mechanical properties (transverse flexural strength, impact strength, shear bond strength, surface microhardness, and surface roughness) of scleral acrylic resin used for ocular prostheses. Two concentrations were selected from the pilot study and evaluated for their effects on scleral acrylic resin properties. According to the pilot study, 0.01 and 0.02wt% AgNPs powder improved the transverse flexural strength, microhardness, and surface roughness compared with other percentages. The specimens in the main study were divided into (3) main groups, (50) specimens without additives (control group A), (50) experimental specimens (with 0.01wt% AgNPs group B), and (50) experimental specimens (with 0.02 wt% AgNPs group C). Each group was subdivided into (5) equal subgroups depending on the tests used. The data were studied using one way ANOVA and post hoc LSD test. At 0.01 wt% AgNPs addition, the mean values of transverse flexural strength insignificantly increased (p> 0.05), and those of impact strength and shear bond strength significantly increased (p< 0.05) compared with those of the control group. At 0.02 wt% AgNPs addition (group C), the mean value of transverse flexural strength significantly increased (p< 0.05), that of impact strength insignificantly increased (p> 0.05), and that of shear bond strength increased with high significance (p< 0.01) compared with those of the control group. Group C showed insignificant increase in the mean values of transverse flexural strength, impact strength, and shear bond strength (p. 0.05) compared with group B. The scleral acrylic resin added with 0.01 and 0.02 wt% AgNPs showed insignificant increase in microhardness and insignificant decrease in surface roughness. The addition of AgNPs powder in both concentrations improved the mechanical properties of scleral acrylic resin used for ocular prostheses.

scholarly journals Surface Treatment Effect on Shear Bond Strength between Lithium Disilicate Glass-Ceramic and Resin Cement

2021 ◽  
Author(s):  
Siripan Simasetha ◽  
Awiruth Klaisiri ◽  
Tool Sriamporn ◽  
Kraisorn Sappayatosok ◽  
Niyom Thamrongananskul
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Glass Ceramic ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Lithium Disilicate ◽  
Surface Treatments ◽  
Resin Cement ◽  
Control Group ◽  
Ceramic Bond

Abstract 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 analyzed with Welch ANOVA and Games-Howell post hoc tests (α = 0.05). Results The highest mean SBS showed in group EXP/ADP (45.49 ± 3.37 MPa); however, this was not significantly different from group EXP/SGII (41.38 ± 2.17 MPa) (p ≥ 0.05). The lowest SBS was shown in the control group (18.36 ± 0.69 MPa). This was not significantly different from group KS (20.17 ± 1.10 MPa) (p ≥ 0.05). Conclusions The different surface treatments significantly affected the SBS value between LDGC and RC. The application of pure silane coupling agent with or without the application of an adhesive improved the SBS value and bond quality.

scholarly journals Influence of Non-Thermal Atmospheric Pressure Plasma Treatment on Shear Bond Strength between Y-TZP and Self-Adhesive Resin Cement

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3321 ◽  
Author(s):  
Dae-Sung Kim ◽  
Jong-Ju Ahn ◽  
Eun-Bin Bae ◽  
Gyoo-Cheon Kim ◽  
Chang-Mo Jeong ◽  
...  
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Atmospheric Pressure ◽  
Shear Bond Strength ◽  
Atmospheric Pressure Plasma ◽  
Resin Cement ◽  
Control Group ◽  
Adhesive Resin ◽  
Pressure Plasma ◽  
Adhesive Resin Cement

The purpose of this study was to evaluate the effect of non-thermal atmospheric pressure plasma (NTP) on shear bond strength (SBS) between yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and self-adhesive resin cement. For this study, surface energy (SE) was calculated with cube-shaped Y-TZP specimens, and SBS was measured on disc-shaped Y-TZP specimens bonded with G-CEM LinkAce or RelyX U200 resin cylinder. The Y-TZP specimens were classified into four groups according to the surface treatment as follows: Control (no surface treatment), NTP, Sb (Sandblasting), and Sb + NTP. The results showed that the SE was significantly higher in the NTP group than in the Control group (p < 0.05). For the SBS test, in non-thermocycling, the NTP group of both self-adhesive resin cements showed significantly higher SBS than the Control group (p < 0.05). However, regardless of the cement type in thermocycling, there was no significant increase in the SBS between the Control and NTP groups. Comparing the two cements, regardless of thermocycling, the NTP group of G-CEM LinkAce showed significantly higher SBS than that of RelyX U200 (p < 0.05). Our study suggests that NTP increases the SE. Furthermore, NTP increases the initial SBS, which is higher when using G-CEM LinkAce than when using RelyX U200.

Effect of Zirconia Surface Roughness on Shear Bond Strength to Resin Cements

2012 ◽  
Vol 512-515 ◽  
pp. 1765-1769 ◽  
Author(s):  
Chen Hu ◽  
Long Quan Shao ◽  
Yuan Fu Yi ◽  
Qi Liu ◽  
Bin Deng ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Treated Group ◽  
Control Group ◽  
Ceramic Surface ◽  
Resin Cements ◽  
Population Means ◽  
Significant Difference ◽  
Rotary Cutting

Despite the expanded application for zirconia in restoration dentistry, there is less clear recommendation in the literature regarding the relation between zirconia surface roughness and its shear bond strength to resin cements. The aim of this study was to assess the effect of surface roughness of Cercon zirconia on its shear bond strength to resin cements. 66 Zirconia rectangular specimens (10 mm×10 mm×3 mm) were prepared from Cercon zirconia blocks, finished using a diamond rotary cutting instrument, sintered, and then assigned into 6 groups. The specimens in the first group without polishing were used as control. Other groups were polished against 120#, 240#, 360#, 500# and 600# sand paper after sintered, respectively. Ceramic surface were analyzed by scanning electron microscopy (SEM) and Surface profilometer. 10 samples of each group were bonded with Variolink N resin cements respectively and submitted to shear bond strength test. Shear bond strength was measured and statistically analyzed. The results showed that the population means of 6 groups of samples were not equal. There was no significant difference between control group and 600# sand paper treated group, 500#, 360# and 240# sand paper treated groups (P>0.05), but a significant difference among the other groups (P<0.05). Findings of this study revealed that the shear bond strength might be raised by increasing the surface roughness of Cercon zirconia. Therefore, the surface roughness of Cercon zirconia has an effect on the shear bond strength, but is not the determining factor in clinical use.

scholarly journals Bond strength of orthodontic brackets to polymethylmethacrylate: effect of the surface treatment and adhesive system

2021 ◽  
Vol 62 (1) ◽  
Author(s):  
Rita Cardoso ◽  
◽  
Joana Godinho ◽  
Luís Jardim ◽  
◽  
...  
Keyword(s):  
Bond Strength ◽  
Aluminum Oxide ◽  
Surface Treatment ◽  
Failure Mode ◽  
Shear Bond Strength ◽  
Adhesive System ◽  
Orthodontic Brackets ◽  
Control Group ◽  
Universal Adhesive ◽  
Machine Failure

Objectives: To evaluate the influence of the surface treatment and adhesive system on the shear bond strength and the failure mode of orthodontic brackets bonded to polymethylmethacrylate surfaces. Methods: Ninety metal brackets (n=15) were bonded to aged discs of polymethylmethacrylate SR Ivocron subjected to three surface conditions (no treatment; sandblasting with 50-μm aluminum oxide; roughening with a tungsten bur), using two combinations of adhesives (methylmethacrylate monomer + Transbond XT Primer; Scotchbond Universal Adhesive) followed by the composite Transbond XT. In the control group, metal brackets were bonded with Transbond XT to 15 human mandibular incisors. The specimens were thermocycled, stored in distilled water (37ºC, 7 days), and tested in shear, using an Instron universal machine. Failure mode was classified according to the adhesive remnant index using a stereomicroscope. The data were analyzed with an analysis of variance and posthoc tests (p<0.05). Results: Significant differences were found between the bracket bond strength to polymethylmethacrylate with different surface treatments (p<0.001). Sandblasting with aluminum oxide was superior to tungsten bur roughening. The adhesive system did not significantly influence the shear bond strength nor the failure mode (p=0.8415). All experimental groups showed lower bond strengths than the control group (p=0.1566). Conclusions: Mechanical surface treatment significantly influenced the bracket’s bond strength to polymethylmethacrylate. Sandblasting with aluminum oxide was the most effective mechanical treatment. The weakest adhesive link was found at the acrylic-adhesive interface. Orthodontic bonding to polymethylmethacrylate was weaker than bonding to enamel, regardless of the surface treatment and the adhesive used.

scholarly journals Evaluation of the Shear Bond Strength and Adhesive Remnant Index in Debonding of Stainless Steel Brackets Assisted with Nd:YAG Laser Irradiation

2019 ◽  
Author(s):  
Maryam Nasiri ◽  
Seyed Amir Hossein Mirhashemi ◽  
Ardavan Etemadi ◽  
Mohammad Javad Kharazi Fard ◽  
Elahe Soltanmohamadi Borujeni ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Bond Strength ◽  
Laser Irradiation ◽  
Nd:Yag Laser ◽  
Shear Bond Strength ◽  
Control Group ◽  
Adhesive Remnant Index ◽  
Enamel Structure ◽  
Two Samples ◽  
Pulp Temperature

Objectives: The purpose was to compare shear bond strength (SBS), pulp temperature, and adhesive remnant index (ARI) in debonding of stainless steel brackets from enamel surface using neodymium-doped yttrium aluminum garnet (Nd:YAG) laser versus the conventional debonding method. Materials and Methods: Forty-eight extracted premolars were bonded to stainless steel brackets. The samples were divided into three experimental groups and one control group. In the first three groups, Nd:YAG laser was used for debonding with the power of 1, 1.5, and 2 W, respectively, for 10 seconds. The SBS and ARI of the samples were assessed. Pulp temperature was recorded before and after irradiation. Two samples from each group were used for determining enamel morphology after debonding using scanning electron microscopy (SEM). Results: The mean SBS in the groups was 33.05, 28.69, 24.37, and 31.53 MPa, respectively, with no statistically significant differences (P=0.205). Significant differences in post-irradiation temperature were noted among the lased groups (P=0.000). Debonding mainly occurred at the adhesive-enamel interface in the 1-W laser and control groups and at the bracket-adhesive interface in the 1.5-W and 2-W laser groups. Enamel structure was amorphous and irregular following laser irradiation. Conclusions: Based on the results of this study, the use of Nd:YAG laser could not significantly affect the SBS. Therefore, this laser would not be suitable for debonding of metal brackets. The use of a 2-W laser could significantly raise the pulpal temperature. Nd:YAG laser renders a more heterogeneous enamel morphology compared to conventional debonding methods.

scholarly journals Effect of CPP-ACP paste with and without CO2 laser irradiation on demineralized enamel microhardness and bracket shear bond strength

2017 ◽  
Vol 22 (4) ◽  
pp. 53-60 ◽  
Author(s):  
Nasrin Farhadian ◽  
Loghman Rezaei-Soufi ◽  
Seyed Farzad Jamalian ◽  
Maryam Farhadian ◽  
Shahrzad Tamasoki ◽  
...  
Keyword(s):  
Bond Strength ◽  
Laser Irradiation ◽  
Co2 Laser ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Enamel Surface ◽  
Control Group ◽  
Demineralized Enamel ◽  
Group 2

ABSTRACT Introduction: Many patients seeking orthodontic treatment already have incipient enamel lesions and should be placed under preventive treatments. The aim of this in vitro study was to evaluate the effect of CPP-ACP paste and CO2 laser irradiation on demineralized enamel microhardness and shear bond strength of orthodontic brackets. Methods: Eighty caries-free human premolars were subjected to a demineralization challenge using Streptococcus mutans. After demineralization, the samples were randomly divided into five equal experimental groups: Group 1 (control), the brackets were bonded without any surface treatment; Group 2, the enamel surfaces were treated with CPP-ACP paste for 4 minutes before bonding; Group 3, the teeth were irradiated with CO2 laser beams at a wavelength of 10.6 µm for 20 seconds. The samples in Groups 4 and 5 were treated with CO2 laser either before or through CPP-ACP application. SEM photomicrographs of a tooth from each group were taken to observe the enamel surface. The brackets were bonded to the buccal enamel using a conventional method. Shear bond strength of brackets and ARI scores were measured. Vickers microhardness was measured on the non-bonded enamel surface. Data were analyzed with ANOVA and Tukey test at the p< 0.05 level. Results: The mean shear bond strength and microhardness of the laser group were higher than those in the control group and this difference was statistically significant (p< 0.05). All groups showed a higher percentage of ARI score 4. Conclusion: CO2 laser at a wavelength of 10.6 µm significantly increased demineralized enamel microhardness and enhanced bonding to demineralized enamel.

Shear bond strength of ceramic brackets bonded to surface-treated feldspathic porcelain after thermocycling

2018 ◽  
Vol 41 (3) ◽  
pp. 160-167 ◽  
Author(s):  
Pinar Cevik ◽  
Oguz Eraslan ◽  
Kursat Eser ◽  
Suleyman Tekeli
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Surface Treatment ◽  
Nd:Yag Laser ◽  
Hydrofluoric Acid ◽  
Shear Bond Strength ◽  
Airborne Particle ◽  
Surface Conditioning ◽  
Ceramic Brackets ◽  
Feldspathic Porcelain

Purpose: The aim of this study was to evaluate the effect of six different surface conditioning methods on the shear bond strength of ceramic brackets bonded to feldspathic porcelain. Materials and methods: A total of 60 feldspathic porcelain disks were fabricated and divided into six subgroups including 10 specimens in each. Specimens were first treated one of the following surface conditioning methods, namely, 37% phosphoric acid (G-H3PO4), 9.4% hydrofluoric acid (G-HF), grinding with diamond burs (G-Grinding), Nd:YAG laser (G-Nd:YAG), Airborne-particle abrasion (G-Abrasion). Specimens were also coated with silane without surface treatment for comparison (G-Untreated). A total of 60 ceramic brackets were bonded to porcelain surfaces with a composite resin and then subjected to thermocycling 2500× between 5°C and 55°C. The shear bond strength test was carried out using a universal testing device at a crosshead speed of 0.5 mm/min. Failure types were classified according to the adhesive remnant index. Analysis of variance and Tukey tests were used for statistical analysis (α = 0.05). Microstructure of untreated and surface-treated specimens was investigated by scanning electron microscopy. Results: Using G-Abrasion specimens resulted in the highest shear bond strength value of 8.58 MPa for feldspathic porcelain. However, the other specimens showed lower values: G-Grinding (6.51 MPa), G-Nd:YAG laser (3.37 MPa), G-HF (2.71 MPa), G-H3PO4 (1.17 MPa), and G-Untreated (0.93 MPa). Conclusion: Airborne-particle abrasion and grinding can be used as surface treatment techniques on the porcelain surface for a durable bond strength. Hydrofluoric acid and phosphoric acid etching methods were not convenient as surface treatment methods for the feldspathic porcelain.

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