scholarly journals Enamel Deproteinization: Will It Save The Shear Bond Strength For The Sake Of Preventing White Spot Lesions?

2021 ◽  
Vol 24 (4) ◽  
Author(s):  
Omnia A. Elhiny ◽  
Dina A. El-Refai
Keyword(s):  
Surface Roughness ◽  
Citric Acid ◽  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Shear Bond Strength ◽  
Acid Group ◽  
Acid Etching ◽  
White Spot Lesions ◽  
Nano Silver ◽  
Peg 400

Objective: This study attempted to investigate the effect of enamel deproteinization using citric acid, PEG 400 and NaOCL on the shear bond strength of orthodontic brackets to enamel using nano-silver modified resin for the prevention of white spot lesions. Material and Methods: 68 premolars were used in the study; nano-silver modified adhesive resin was used to bond orthodontic brackets to the enamel. Specimens were divided into 4 groups according to the applied surface treatment before bonding. Group I (control): acid etching with 37% phosphoric acid. Group II: deproteinization using 5.25% sodium hypochlorite (NaOCl) before acid etching. Group III:deproteinization using 10% citric acid before acid etching. Group IV:deproteinization using 5% polyethylene glycol (PEG 400) before acid etching. The specimens were then thermo- cycled for 6000 cycles. They were examined for surface roughness, shear bond strength and using electron microscope. electron microscope Results: In both surface roughness and shear bond strength tests, Group III (citric acid) showed the highest values, followed by Group II (sodium hypochlorite); (p < 0.001). The least values were shown for Groups I (control) and IV (PEG 400), with no statistically significant difference between them (p = 0.948). SEM revealed etching pattern type 1 and 2 in the citric acid group while PEG 400 showed shallower micro- porosities. Conclusions: Deproteinization of enamel using either NaOCl or citric acid increased the bond strength of nano-sliver modified resin to enamel, with citric acid showing greater increase in bond strength. Deproteinization using PEG 400 did not increase the bond strength.   Keywords Deproteinization; Sodium hypochlorite; Citric acid; PEG 400; Nano- silver modified adhesives.

Deproteinizing Agents as an Effective Enamel Bond Enhancer-An in Vitro Study

2017 ◽  
Vol 41 (4) ◽  
pp. 280-283 ◽  
Author(s):  
Pallavi Hasija ◽  
Vinod Sachdev ◽  
Shivani Mathur ◽  
Rishi Rath
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acid Etching ◽  
Control Group ◽  
P Value ◽  
Group 4 ◽  
Significant Difference ◽  
Group 1

Objective: The aim of this study was to compare the effect of different deproteinizing agents on shear bond strength of composite to primary teeth enamel. Study Design: Forty sound primary molars divided in 4 groups of 10 teeth each. In control group 1, enamel was etched for 60 seconds with 37% phosphoric acid and rinsed with water. Group 2: after acid etching deproteinizing agent 5 % sodium hypochlorite was applied for 60 seconds and rinsed. Group 3: after acid etching deproteinizing agent papain gel was applied for 60 seconds and rinsed. Group 4: after acid etching deproteinizing agent bromelain gel applied for 60 seconds and rinsed. Following this, bonding agent was applied to treated enamel surface and composite resin disc were build. Samples were then tested for shear bond strength using Universal Testing Machine. Results: Mean SBS was highest for group 4 and lowest for group 1. No statistically significant difference (p value &gt;0.05) was found between all the four groups. Conclusion: Among deproteinizing agents, deproteinization when carried out with bromelain gel and sodium hypochlorite showed effective bond strength as compared to papain.

scholarly journals Orthodontic shear bond strength to porcelain surface in wet conditions

2016 ◽  
Vol 31 (2) ◽  
pp. 59
Author(s):  
Magáli Beck Guimarães ◽  
Bárbara Cocco ◽  
Rodrigo Salbego Bueno ◽  
Micéli Beck Guimarães Blaya ◽  
Letícia Borges Jacques ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Acid Group ◽  
Acid Etching ◽  
Time Interval ◽  
Fracture Rate ◽  
Test Machine ◽  
Water Control ◽  
Group 2

Objective: To evaluate the shear bond strength of orthodontic accessories bonded to a porcelain surface after storage in water.Methods: One-hundredand-twenty feldspathic porcelain discs were divided into 4 groups, according to the surface treatment: Group 1 – 37% phosphoric acid etching; Group 2 – 10% fluorhydric acid; Group 3 – 37% phosphoric acid and silane application; Group 4 – 10% fluorhydric acid and silane application. After the accessories were bonded, the sample was divided into two subgroups, according to the time interval of storage in distilled water: Control – 24 hours; and Test – 150 days. Shear bond strength was determined using a universal test machine, and failure type was verified by scanning electron microscopy.Results: In the test groups there was reduction in shear bond strength, particularly when silane was used. Test Groups 2 and 4 presented shear bond strength values within those proposed as adequate for orthodontic bonding. Groups 1 and 3  presented adhesive failures between porcelain and resin, whereas in Groups 2 and 4 cohesive failures in porcelain were recorded.Conclusion: Storage in water for 150 days decreased the bond strength at silanized interfaces. Fluorhydric acid etching generates adequate bond strength in wet conditions, however, increases the fracture rate in porcelain.

Enamel Deproteinization Before Acid Etching and its Effect on the Shear Bond Strength – An in vitro Study

2011 ◽  
Vol 36 (1) ◽  
pp. 19-24 ◽  
Author(s):  
N Harleen ◽  
Y Ramakrishna ◽  
AK Munshi
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Enamel Surface ◽  
Acid Etching ◽  
Distilled Water ◽  
Single Bond ◽  
Significant Difference ◽  
Group B

Objective: This study was undertaken to assess the effect of enamel deproteinization with 5.25% sodium hypochlorite (NaOCl) before phosphoric acid (H3PO4) etching on the shear bond strength of Adper™ Single Bond 2 adhesive and Filtek™ Z- 350 XT composite resin . Study design: Forty human sound permanent molars which were extracted for periodontal reasons were used in the experimental protocol as under:Group-A (20 teeth):– A 5X4 mm window of the enamel surface was etched with 37% H3PO4 gel for 15 seconds,washed with distilled water and air dried. A single coat of Adper™ Single Bond 2 adhesive was applied and photo polymerized for 20 seconds and Filtek™ Z- 350 XT composite resin block of length 5mm,width 4mm and height 5mm respectively was built and photo polymerized in increments for 20 seconds each. Group-B (20 teeth):- Similarly the enamel surface was treated with 5.25% NaOCl for 60 seconds, washed with distilled water and then etched with 37% H3PO4 gel for 15 seconds, washed with distilled water and air dried. A single coat of Adper™ Single Bond 2 adhesive was applied and photo polymerized for 20 seconds and Filtek™ Z- 350 XT composite resin block of length 5mm, width 4mm and height 5mm respectively was built and photo polymerized in increments for 20 seconds each. The shear bond strength of all the samples were measured (in MPa) on Instron Mechanical Testing Machine. Results: The mean shear bond strength value for Group-A was 13.51 ± 5.726 MPa and for Group-B being 15.06 ± 6.220 MPa. No statistically significant difference in the shear bond strengths was observed between the two groups. Conclusions:No significant effect of sodium hypochlorite enamel deproteinization on the shear bond strength of Adper™ Single Bond 2 adhesive and Filtek™ Z- 350 XT composite resin before acid etching was observed in this study.

scholarly journals The Effect of Different Disinfecting Agents on Bond Strength of Resin Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmed Mohammed Hassan ◽  
Ahmed Ali Goda ◽  
Kusai Baroudi
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Control Group ◽  
Posterior Teeth ◽  
Surface Pretreatment ◽  
Dentin Surface ◽  
Post Hoc

Objective. The aim of this study was to evaluate the effect of different disinfectant agents on bond strength of two types of resin composite materials.Methods. A total of 80 sound posterior teeth were used. They were divided into four groups(n=20)according to the dentin surface pretreatment (no treatment, chlorhexidine gluconate 2%, sodium hypochlorite 4%, and EDTA 19%). Each group was divided into two subgroups according to the type of adhesive (prime and bond 2.1 and Adper easy one). Each subgroup was further divided into two subgroups according to the type of resin composite (TPH spectrum and Tetric EvoCeram). Shear bond strength between dentin and resin composite was measured using Universal Testing Machine. Data collected were statistically analyzed byt-test and one-way ANOVA followed by Tukey’spost hoctest.Results. It was found that dentin treated with EDTA recorded the highest shear bond strength values followed by sodium hypochlorite and then chlorhexidine groups while the control group showed the lowest shear bond strength.Conclusions. The surface treatment of dentin before bonding application has a great effect on shear bond strength between resin composite and dentin surface.

scholarly journals Four chemical methods of porcelain conditioning and their influence over bond strength and surface integrity

2015 ◽  
Vol 20 (4) ◽  
pp. 51-56 ◽  
Author(s):  
João Paulo Fragomeni Stella ◽  
Andrea Becker Oliveira ◽  
Lincoln Issamu Nojima ◽  
Mariana Marquezan
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Surface Integrity ◽  
Hydrofluoric Acid ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acid Etching ◽  
Ceramic Surface ◽  
Surface Conditioning ◽  
Phosphoric Acid Etching

OBJECTIVE: To assess four different chemical surface conditioning methods for ceramic material before bracket bonding, and their impact on shear bond strength and surface integrity at debonding.METHODS: Four experimental groups (n = 13) were set up according to the ceramic conditioning method: G1 = 37% phosphoric acid etching followed by silane application; G2 = 37% liquid phosphoric acid etching, no rinsing, followed by silane application; G3 = 10% hydrofluoric acid etching alone; and G4 = 10% hydrofluoric acid etching followed by silane application. After surface conditioning, metal brackets were bonded to porcelain by means of the Transbond XP system (3M Unitek). Samples were submitted to shear bond strength tests in a universal testing machine and the surfaces were later assessed with a microscope under 8 X magnification. ANOVA/Tukey tests were performed to establish the difference between groups (α= 5%).RESULTS: The highest shear bond strength values were found in groups G3 and G4 (22.01 ± 2.15 MPa and 22.83 ± 3.32 Mpa, respectively), followed by G1 (16.42 ± 3.61 MPa) and G2 (9.29 ± 1.95 MPa). As regards surface evaluation after bracket debonding, the use of liquid phosphoric acid followed by silane application (G2) produced the least damage to porcelain. When hydrofluoric acid and silane were applied, the risk of ceramic fracture increased.CONCLUSIONS: Acceptable levels of bond strength for clinical use were reached by all methods tested; however, liquid phosphoric acid etching followed by silane application (G2) resulted in the least damage to the ceramic surface.

scholarly journals Evaluation of surface properties and shear bond strength of zirconia substructure after sandblasting and acid etching

2020 ◽  
Vol 7 (9) ◽  
pp. 095403
Author(s):  
Qingqing Zhang ◽  
Chun Yao ◽  
Chunping Yuan ◽  
Hao Zhang ◽  
Lin Liu ◽  
...  
Keyword(s):  
Bond Strength ◽  
Surface Properties ◽  
Shear Bond Strength ◽  
Acid Etching

scholarly journals Reinforcement of bond strength of self-etching orthodontic adhesive

2011 ◽  
Vol 82 (1) ◽  
pp. 30-35
Author(s):  
Shinya Horiuchi ◽  
Shingo Kuroda ◽  
Masahiro Hiasa ◽  
Toshiyuki Suge ◽  
Seitaro Saku ◽  
...  
Keyword(s):  
Citric Acid ◽  
Phosphoric Acid ◽  
Bond Strength ◽  
Polyacrylic Acid ◽  
Shear Bond Strength ◽  
Adhesive System ◽  
Control Group ◽  
Bonding System ◽  
Adhesive Remnant Index ◽  
Debonding Process

Abstract Objective: To determine the reinforcement of bond strength of a self-etching system by applying a pretreatment agent. Materials and Methods: Sixty extracted human premolars were used in this study. The enamel surfaces were treated with four pretreatment agents—phosphoric acid, polyacrylic acid, citric acid, and ammonium hexafluorosilicate (SiF)—and were examined under a scanning electron microscope. Afterward, orthodontic brackets were bonded with a self-etching adhesive system (n  =  10 for each agent), and shear bond strength was measured through a debonding process. The adhesive remnant index (ARI) was also assessed. Results: Enamel surfaces treated with polyacrylic acid seemed almost the same as intact enamel. Treatment with SiF induced slight shallow depressions compared with the intact enamel. On the other hand, enamel surfaces treated with citric acid and phosphoric acid showed severe etching patterns. All pretreatments increased the bond strength, but SiF-treated specimens revealed the greatest strength (12.201 ± 1.048 MPa), followed by polyacrylic acid (12.030 ± 2.103 MPa). The control group with no pretreatment showed the least strength (9.078 ± 1.678 MPa). All pretreatments increased ARI score compared with the control group. Conclusions: Surface conditioning before bracket adhesion could reinforce the bond strength of the self-etching adhesive system, resulting in a more reliable bonding system.

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