scholarly journals Shear Bond Strength of Orthodontic Brackets Bonded to Provisional Crown Materials Utilizing Two Different Adhesives

2009 ◽  
Vol 79 (4) ◽  
pp. 784-789 ◽  
Author(s):  
Sameer Rambhia ◽  
Reza Heshmati ◽  
Virendra Dhuru ◽  
Anthony Iacopino
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
The Other ◽  
Bond Failure ◽  
Adhesive Resin ◽  
Significant Difference ◽  
Numeric Data ◽  
Type Of Failure ◽  
Range Test ◽  
Adhesive Type

Abstract Objective: To test the hypothesis that there is no difference in the shear bond strength of brackets bonded to provisional crown materials (PCMs) using two adhesive agents. Materials and Methods: Four PCMs were tested: Integrity, Jet, Protemp, and Snap. Forty cylindrical specimens of 10 mm diameter × 5 mm were prepared for each PCM. Ten specimens from each group were bonded to one of the two brackets, Clarity or Victory, using one of the two adhesives, Fuji Ortho LC or Ortho Bracket Adhesive. The brackets were debonded in shear at a cross-head speed of 5 mm/min, and the shear bond strength (SBS) was calculated. The type of failure was visually determined. The numeric data were analyzed using three-way analysis of variance and Tukey multiple range test at α = .05. Results: The mean SBSs ranged from 2.81 MPa to 9.65 MPa. There was a significant difference between Snap and the other three materials (P < .0001). There was no significant difference between the two brackets or the two adhesives (P > .05). The bond failure for all the specimens was of the adhesive type between the PCM and the adhesive resin. Conclusions: The PCM Snap yielded a significantly lower mean SBS value compared to the other three materials. No significant differences were found between the brackets or the adhesives. The bond failure was of the adhesive type.

scholarly journals Comparative Evaluation of Immediate Bond Strength to Bleached Enamel Following Application of Various Antioxidant Solutions

2017 ◽  
Vol 05 (02) ◽  
pp. 084-089
Author(s):  
Alisha Dhingra ◽  
Ashu Gupta ◽  
Anshu Minocha ◽  
Nayantara Sen
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Grape Seed Extract ◽  
Grape Seed ◽  
Seed Extract ◽  
The Other ◽  
Sodium Ascorbate ◽  
Group V ◽  
Group I ◽  
Significant Difference

Abstract Aim: The aim of this study was to compare the reversal of shear bond strength of composite to bleached enamel immediately after bleaching followed by application of various antioxidant solutions. Material and Methods: Seventy central incisors were divided into seven groups. Groups I and II served as unbleached and bleached controls respectively. Groups III, IV, V, VI and VII served as the experimental groups and were subjected to 37.5% hydrogen peroxide bleaching followed by 10 min application of 10% sodium ascorbate, 25% alpha-tocopherol, 6.5% grape seed extract, 5% lycopene and 5% green tea extract respectively. Following composite bonding, shear bond strength was determined and the results were analyzed using ANOVA followed by Post Hoc Multiple Comparisons test. Results: The bond strength values for Group I (positive control) were maximum and significantly different than all the other groups except Grape seed extract group (Group V). When compared to Group II (bleached control), all the groups showed significantly higher bond strength. Significant difference in the bond strength values were seen between Group III (10% sodium ascorbate) and Group V. Also values for Group V were significantly different from Group VI (5% lycopene). All the other values showed insignificantly different results. Conclusion: All the antioxidant solutions improved the shear bond strength values after bleaching but only Grape seed extract application reversed the values to the non bleached levels. Lycopene was least effective. Other antioxidants showed comparable results.

Assessment of Self-Adhesive Resin Composites: Nondestructive Imaging of Resin–Dentin Interfacial Adaptation and Shear Bond Strength

2015 ◽  
Vol 21 (6) ◽  
pp. 1523-1529 ◽  
Author(s):  
Patricia Makishi ◽  
Rafael R. Pacheco ◽  
Alireza Sadr ◽  
Yasushi Shimada ◽  
Yasunori Sumi ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Resin Composites ◽  
Third Molars ◽  
Average Strength ◽  
Adhesive Resin ◽  
High Brightness ◽  
Significant Difference ◽  
Nondestructive Imaging ◽  
Vertise Flow

AbstractShear bond strength (SBS) and the interfacial adaptation (IA) of self-adhesive resin (SAR) composites to dentin were evaluated. Two SARs [Vertise Flow (VTF) and Fusio Liquid Dentin (FLD)] were evaluated and compared with a conventional restorative system [adhesive: OptiBond FL and composite: Herculite Précis (OBF/HP)]. Human third molars were used for SBS testing and IA imaging (n=7) using optical coherence tomography (OCT). Flattened dentin disks were prepared and the composites were applied into molds (2.4 mm diameter) that were positioned on dentin. Samples were subjected to SBS testing and OCT analysis, which considered an increase in signal intensity at the bonded interface as evidence of internal gaps. SBS data were analyzed by one-way analysis of variance and Tukey’s test and IA data (% distribution of high brightness values) by Kruskal–Wallis and Dunn’s test (p≤0.05). No statistically significant difference in SBS was observed between VTF (13.9±3.6 MPa) and FLD (11.3±3.2 MPa), whereas OBF/HP showed higher average strength (27.3±6.1 MPa). However, there was a statistically significant difference in IA when VTF (33.3%) was compared with FLD (1.2%) and OBF/HP (1.5%). The conventional restorative system exhibited superior SBS performance compared with SARs. However, the IA of FLD to dentin had values that were not significantly different from OBF/HP.

scholarly journals Evaluation of the bond strength of orthodontic brackets and the degree of polymerisation and microhardness of an orthodontic adhesive using polyvawe light curing unit and varying light densities

2020 ◽  
Vol 23 (4) ◽  
pp. 9p
Author(s):  
Nuri Mert Topbasi ◽  
Yasin Atakan Benkli
Keyword(s):  
Bond Strength ◽  
Light Emitting Diode ◽  
Control Group ◽  
Bond Failure ◽  
Adhesive Resin ◽  
Mean Values ◽  
Light Emitting ◽  
Significant Difference ◽  
Light Curing

Objective: This study evaluates the shear bond strength (SBS) and Vickers micro-hardness (VHN) of the orthodontic adhesive resin Transbond XT using thermocycled samples. The study also measures the degree of cure by poliwave light curing unit Valo. Materials and Methods: 135 brackets were bonded for the SBS test, and 90 disc-shaped orthodontic adhesive resins were prepared for the VHN test. The measurements were taken either immediately or after 500 or 10.0000 thermocycling. The SBS and VHN test data were statistically evaluated using a Two-way ANOVA and Tukey multiple comparison tests. The degree of conversion (DC) was measured by FTIR. Results: The 10-sec polymerized control group (57.08) and the 10.000 termocycled samples (55.96) had the highest VHN scores. On the other hand, the 3 second polymerized and the 10.000 termocycled samples (39.22) had the lowest VHN scores. There was no significant difference in the bracket SBS values between the termocycled and immediate groups. An evaluation of the bond failure surfaces revealed that the ARI scores did not differ between the immediate and the thermo-cycled groups according to the power modes. The FTIR results revealed that the lowest DC was seen in the 3 second light-cured sample. Conclusion: Transbond XT provided sufficient bonding in terms of microhardness and DC under in vitro bracket bonding conditions after 10 and 8 seconds of Poliwave LED curing. However, low mean values were seen in the groups that received Poliwave LED curing for only 3 seconds. KEYWORDSARI score; FTIR; Light-Emitting Diode; Orthodontics; Thermocycling.

scholarly journals Antimicrobial and physical characteristics of orthodontic primers containing antimicrobial agents

2016 ◽  
Vol 87 (2) ◽  
pp. 307-312 ◽  
Author(s):  
Shin-Hye Chung ◽  
Soha Cho ◽  
Kyungsun Kim ◽  
Bum-Soon Lim ◽  
Sug-Joon Ahn
Keyword(s):  
Antimicrobial Activity ◽  
Bond Strength ◽  
Physical Properties ◽  
Biofilm Formation ◽  
Shear Bond Strength ◽  
Antimicrobial Agents ◽  
Antimicrobial Activities ◽  
Water Tank ◽  
Bond Failure ◽  
Significant Difference

ABSTRACT Objective: To compare the antimicrobial and physical properties of experimental primers containing chlorhexidine (CHX) or ursolic acid (UA) with a commercial primer. Materials and Methods: Two antibacterial agents, 3 mg each of CHX and UA were incorporated respectively into 1 ml of Transbond XT primer (TX) to form antibacterial primers, TX-CHX and TX-UA. The antimicrobial activity of the three primers (TX, TX-CHX, and TX-UA) against Streptococcus mutans in both planktonic and biofilm phases was analyzed by determining minimum inhibitory and bactericidal concentrations and by performing growth and biofilm assays. Growth and biofilm assays were performed in both the absence and presence of thermocycling in a water tank to analyze the effects of water aging on the antimicrobial activities of primers. After bonding brackets onto bovine incisors using the primers, shear bond strength and mode of fracture were analyzed to compare physical properties. Results: TX-CHX had stronger antimicrobial activity against S. mutans in the planktonic and biofilm phases than did TX or TX-UA. When applied, TX-CHX completely inhibited the growth and biofilm formation of S. mutans. In addition, the antimicrobial activity of TX-CHX was maintained after thermocycling. However, TX-UA did not show significant antimicrobial activity compared with TX. There was no significant difference in either shear bond strength or bond failure interface among the primers. Conclusion: Incorporation of CHX into an orthodontic primer may help prevent enamel demineralization around surfaces without compromising its physical properties.

scholarly journals Surface Conditioning Methods and Polishing Techniques Effect on Surface Roughness of a Feldspar Ceramic

2007 ◽  
Vol 77 (4) ◽  
pp. 723-728 ◽  
Author(s):  
YŞinasi Saraç ◽  
Selma Elekdag-Turk ◽  
Duygu Saraç ◽  
Tamer Turk
Keyword(s):  
Surface Roughness ◽  
Bond Strength ◽  
Hydrofluoric Acid ◽  
Shear Bond Strength ◽  
The Other ◽  
Surface Conditioning ◽  
Diamond Polishing ◽  
Significant Difference ◽  
Aluminum Trioxide ◽  
Group A

Abstract Objective: To investigate the effects of three surface conditioning methods on shear bond strength (SBS) and on surface roughness (Ra) of a feldspathic ceramic, and to compare the efficiency of three polishing techniques. Materials and Methods: A total of 106 feldspathic specimens were used. Thirty specimens were divided into three groups according to the surface conditioning methods: air-particle abrasion (APA) with 25-μm aluminum trioxide (Al2O3) (group A); hydrofluoric acid (HFA) (group H); APA and HFA (group AH). Metal brackets were bonded and subjected to SBS testing. Sixty-three specimens were divided into three groups according to the surface conditioning method. Ra was evaluated profilometrically. Then, each group was divided into three subgroups according to the polishing technique, ie, adjustment kit, diamond polishing paste, adjustment kit + diamond polishing paste. Following polishing, the second Ra values were obtained. Results: The lowest SBS was obtained for group H. This value was significantly different from the values of groups A and AH (P < .05). The lowest Ra value was observed for group H (P < .001). There was no significant difference between groups A and AH (P > .05). No significant differences between the subgroups in which a polishing paste was used were observed (P > .05). There was no significant difference between the adjustment kit and the adjustment kit + a diamond polishing paste (P > .05). Conclusion: APA or APA + HFA created rougher porcelain surfaces than HFA alone. Both adjustment kit use and the adjustment kit + polishing paste application were effective to smooth the porcelain, but one was not found superior to the other.

Effect of Remineralizing Agents on Bond Strength of Resin-Composites to Primary Enamel

2019 ◽  
Vol 43 (5) ◽  
pp. 331-336
Author(s):  
Faika Y Abdelmegid ◽  
Fouad S Salama ◽  
Eman I Abouobaid ◽  
Hassan S Halawany ◽  
Mohamad K Alhadlaq
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Resin Composites ◽  
Bond Failure ◽  
In Vitro Investigation ◽  
Significant Difference ◽  
Mode Of Failure ◽  
Post Hoc

Aim: The purpose of this in vitro investigation was to assess the effect of three remineralizing agents (Voco Remin Pro®, Uncle Harry's remineralization kit, Sunshine remineralization gel) on the shear bond strengths of two resin-composites (Tetric® N-Ceram and Filtek™ Z250 Universal Restorative) to enamel of primary molars. Study design: Ninety-six enamel specimens were prepared and randomly distributed to eight groups according to the control, remineralizing agents, and resin composite used. Shear bond strength was measured at a crosshead speed of 0.5 mm/min and the type of bond failure was recorded. Results: The highest shear bond strength (Mean+SD) in MPa was for Tetric® N-Ceram/control [21.06+1.68] while the lowest was for Filtek™ Z250/Sunshine remineralization gel [11.98+1.46]. Tukey HSD Post Hoc Tests showed significant difference between Tetric® N-Ceram/control and all other groups (p=0.0001) except Filtek™ Z250/control. In addition, there was significant difference between Filtek™ Z250/control and all other groups (p=0.0001) except Tetric® N-Ceram/control and Tetric® N-Ceram/Uncle Harry's remineralization kit. Mode of failure was cohesive (9.38%), adhesive (55.21%), and mixed (35.42%). Conclusions: The three tested remineralizing agents affect shear bond strength of the tested resin-composites to enamel of primary teeth. In general, shear bond strength values were acceptable. Mode of failure was mostly adhesive.

An Ex Vivo Study of Self-, Light-, and Dual-cured Composites for Orthodontic Bonding

1995 ◽  
Vol 22 (4) ◽  
pp. 319-323 ◽  
Author(s):  
Anne E. Sargison ◽  
John McCabe ◽  
Peter H. Gordon
Keyword(s):  
Bond Strength ◽  
Ex Vivo ◽  
Composite Resins ◽  
The Other ◽  
Orthodontic Brackets ◽  
Bond Failure ◽  
Bond Strengths ◽  
Mechanical Insult ◽  
Ex Vivo Study ◽  
Range Test

It was postulated that using a dual-cured composite to bond orthodontic brackets could result in bond strengths comparable with those of chemically-activated materials and higher than those for light-activated materials. The shear bond strength of four composite resins used to attach mesh-backed orthodontic brackets was measured at 24 hours and following mechanical insult in the ball-mill. Analysis of variance and an SNK range test showed that at 24 hours Dual-cured Porcelite® gave a significantly higher mean bond strength than the other materials (P<0·05). However, following ball-milling the mean bond strength for Right-on® was apparently significantly higher than that of the other materials. (P<0·05). In this study, the mode of bond failure is also analysed and the use of Weibull analysis in bond strength testing is described.

scholarly journals Effect of Desensitizing Agents on the Bond Strength of Mild and Strong Self-etching Adhesives

2015 ◽  
Vol 40 (5) ◽  
pp. 548-557 ◽  
Author(s):  
C Sabatini ◽  
Z Wu
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Control Group ◽  
Routine Practice ◽  
Control Groups ◽  
Significance Level ◽  
Significant Difference ◽  
Desensitizing Agents ◽  
Type Of Failure ◽  
Composite Cylinders

SUMMARY Background Desensitizing agents are used, almost as routine practice, in many adhesive restorative procedures. There is still debate as to their effect in dentin bonding, particularly with self-etching adhesives. The present study aimed to evaluate the effect of different desensitizing agents on the bond strength of mild and strong self-etching adhesive systems to dentin. Materials and Methods One hundred twenty recently extracted, noncarious human molars were used to obtain superficial dentin substrate for bonding. No desensitizer was used in the control groups. The experimental groups were pretreated with Gluma Desensitizer, MicroPrime B, and Dentin Desensitizer immediately prior to bonding with self-etching adhesives Optibond XTR, Xeno IV, and iBond. A bonding jig was used to fabricate composite cylinders, which were stored for either 24 hours or three months, after which the shear bond strength (SBS) was evaluated using a notched-edge testing device at a crosshead speed of 1 mm/min. Failure mode distribution was also evaluated at 24 hours and three months. A two-way analysis of variance, Tukey test, and Student t-test, with a significance level of p&lt;0.05, were used for data analysis. Results At 24 hours, there was no significant difference in SBS when the same adhesive was used with any of the experimental desensitizing agents compared with the control group without desensitizer. However, at three months, Dentin Desensitizer bonded with Optibond XTR demonstrated significantly lower SBS (p&lt;0.001), while Gluma bonded with iBond showed significantly higher SBS values (p=0.034) relative to their corresponding control group. Only MicroPrime B bonded with Xeno IV and iBond with no desensitizer demonstrated a significant reduction in SBS after three months (p=0.034 and p=0.002, respectively). The most prevalent type of failure was adhesive. Conclusion Desensitizing agents can be used in combination with self-etching adhesives to control hypersensitivity without adversely affecting their bond strength to dentin.

scholarly journals SHEAR BOND STRENGTH OF BISPHENOL A-GLYCIDYL METHACRYLATE ADHESIVE RESIN AFTER APPLICATION OF EUCALYPTUS OIL BEFORE DEBONDING METALLIC ORTHODONTIC BRACKET

2019 ◽  
pp. 187-189
Author(s):  
ARISTY RIYANTI ◽  
ERWIN SIREGAR ◽  
HARU SETYO ANGGANI
Keyword(s):  
Bisphenol A ◽  
Bond Strength ◽  
Glycidyl Methacrylate ◽  
Shear Bond Strength ◽  
Control Group ◽  
Adhesive Resin ◽  
Orthodontic Bracket ◽  
Eucalyptus Oil ◽  
Significant Difference ◽  
Group 2

Objective: Debonding of orthodontic braces could lead to enamel fracture and moderate discomfort for the patients. This study was conducted toexamine whether eucalyptus oil and eucalyptol were effective in decreasing the shear bond strength and facilitate the debonding of metallic bracketsbonded with bisphenol A-glycidyl methacrylate (bis-GMA) adhesive resin.Methods: Thirty upper premolar teeth were randomly divided into the following three groups: Group 1 (75% eucalyptus oil), Group 2 (100%eucalyptol), and Group 3 (aquades; controls). Gemini brackets (3M Unitek, Monrovia) were bonded to the teeth using Transbond XT (3M Unitek,Monrovia). The areas around the brackets were lubricated with 75% eucalyptus oil, 100% eucalyptol, and aquades for 10 min before debonding.Results: A significant difference in shear bond strength between Group 2 and the control group was noted (p<0.05).Conclusion: The findings of this study indicated that eucalyptol can decrease the shear bond strength of bis-GMA-based adhesive resin after 10 minof application.

scholarly journals Effect of decontamination methods on shear bond strength of resin cement to translucent monolithic zirconia

2020 ◽  
Vol 23 (4) ◽  
pp. 9p
Author(s):  
Mazen Ahmed Attia ◽  
Kamal Khaled Ebeid
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Strength Test ◽  
Resin Cement ◽  
Adhesive Resin ◽  
Tukey Test ◽  
Significant Difference ◽  
Monolithic Zirconia ◽  
Adhesive Resin Cement ◽  
Saliva Contamination

Objective. The aim of this study was to evaluate the effect of decontamination methods on shear bond strength of resin cement to translucent monolithic zirconia. Material and Methods. Eighty 4-mol yttria-stabilized tetragonal zirconia polycrystal specimens were fabricated. All specimens were subjected to saliva contamination and divided into four groups (n=20) according to the decontamination methods: 70% isopropanol (AL); zirclean (ZC); 5.25% sodium  ypochlorite (NaOCL); and no cleaning (NC). All specimens were bonded by using self-adhesive resin cement. Half of the specimens in each group (n=10) were subjected to thermocycling. All specimens were subjected to shear bond strength test in a universal testing machine. Failure modes were evaluated by using a scanning electron microscope (SEM). The data obtained were statistically analyzed by using one-way ANOVA followed by the HSD Tukey test (P < 0.05). Results. ANOVA test revealed a significant difference among the different decontamination methods (P < 0.05). No significant differences were found among NaOCL, ZC, and AL groups as revealed by the HSD Tukey test (P > 0.05). The effect of thermocycling was significantly different in all groups (P < 0.05); whereas, no significant difference was found in group ZC (P > 0.05). (SEM) analysis showed mixed failures in all groups except in group NC where only adhesive failure was observed. Conclusion. Saliva contamination during clinical evaluation significantly decreases the shear bond strength between self-adhesive resin cement and translucent monolithic zirconia. The cleaning gel has an impact on improving the bond strength between resin cement and translucent monolithic zirconia.   KEYWORDS Monolithic zirconia; Resin cement; Shear bond strength test; Translucent zirconia; Zirclean.

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