scholarly journals Effects of Potassium Nitrate and Oxalate Desensitizer Agents on Shear Bond Strengths of Orthodontic Brackets

2007 ◽  
Vol 77 (6) ◽  
pp. 1096-1100 ◽  
Author(s):  
Hakan Türkkahraman ◽  
Necdet Adanir
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Potassium Nitrate ◽  
Orthodontic Brackets ◽  
Group Iii ◽  
Group I ◽  
Halogen Light ◽  
Significant Difference ◽  
Bond Strengths

Abstract Objective: To evaluate the effects of potassium nitrate and oxalate desensitizer agents on shear bond strengths of orthodontic brackets. Materials and Methods: Forty-five extracted human premolar teeth were randomly assigned to three groups of 15 each. UltraEZ potassium nitrate desensitizer was applied on teeth in the first group, while BisBlock oxalate desensitizer was applied on teeth in the second group. The third group served as a control. Orthodontic brackets were bonded with a light cure composite resin and cured with a halogen light. After bonding, the shear bond strength of the brackets was tested with a universal testing machine. Results: The highest shear bond strengths were measured in Group III. The shear bond strength in Groups I and II was significantly lower than in Group III (P < .001). Significant difference was also found between Group I and Group II (P < .01). Conclusions: Orthodontic brackets bonded to enamel treated with potassium nitrate and oxalate desensitizers showed significantly lower bond strengths than did brackets bonded to untreated enamel.

scholarly journals Effects of different bleaching methods on shear bond strengths of orthodontic brackets

2012 ◽  
Vol 83 (4) ◽  
pp. 686-690 ◽  
Author(s):  
Ahmet Yalcin Gungor ◽  
Erhan Ozcan ◽  
Huseyin Alkis ◽  
Hakan Turkkahraman
Keyword(s):  
Shear Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Group Iii ◽  
Group I ◽  
Human Enamel ◽  
Significant Difference ◽  
Bond Strengths ◽  
Group Ii ◽  
Method Group

ABSTRACT Objective: To evaluate the effects of different bleaching methods on the shear bond strength (SBS) of orthodontic brackets. Materials and Methods: Forty-five freshly extracted premolars were randomly divided into three groups (n  =  15 per group). In group I, bleaching was performed with the office bleaching method. In group II, bleaching was performed with the home bleaching method. Group III served as the control. Orthodontic brackets were bonded with a light cure composite resin and cured with an LED light. After bonding, the SBS of the brackets were tested with a Universal testing machine. Results: Analysis of variance indicated a significant difference between groups (P < .001). The highest values for SBS were measured in group III (20.99 ± 2.32 MPa). The SBS was significantly lower in groups I and II than in group III (P < .001). The lowest values for SBS were measured in group II (6.42 ± 0.81 MPa). SBS was significantly higher in group I than in group II (P < .001). Conclusions: Both of the bleaching methods significantly affected the SBS of orthodontic brackets on human enamel. Bleaching with the home bleaching method affected SBS more adversely than did bleaching with the office bleaching method.

scholarly journals Effects of Fluorosis and Self Etching Primers on Shear Bond Strengths of Orthodontic Brackets

2009 ◽  
Vol 03 (03) ◽  
pp. 173-177 ◽  
Author(s):  
Ahmet Yalcin Gungor ◽  
Hakan Turkkahraman ◽  
Necdet Adanir ◽  
Huseyin Alkis
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Universal Testing ◽  
Adhesive Remnant Index ◽  
Halogen Light ◽  
Significant Difference ◽  
Bond Strengths ◽  
Group Ii ◽  
Clinical Changes

ABSTRACTObjectives: To evaluate the effects fluorosis and self etching primers (SEP) on shear bond strengths (SBS) of orthodontic brackets.Methods: A total of 48 (24 fluorosed and 24 non-fluorosed) non-carious freshly extracted human permanent premolar teeth were used in this study. Fluorosed teeth were selected according to the modified Thylstrup and Fejerskov index (TFI), which is based on the clinical changes in fluorosed teeth. Fluorosed and non-fluorosed teeth were randomly assigned to 4 groups of 12 each. In groups I (non-fluorosed teeth) and II (fluorosed teeth), standard etching protocol was used and brackets were bonded with Light Bond. In groups III (non-fluorosed teeth) and IV (fluorosed teeth), Transbond Plus SEP was used and brackets were bonded with Transbond XT Light Cure Adhesive. All specimens were cured with a halogen light. After bonding, SBS of the brackets were tested with Universal testing machine. After debonding, all teeth and brackets in the test groups were examined under 10x magnifications. Any adhesive remained after debonding was assessed and scored according to the modified Adhesive Remnant Index (ARI).Results: ANOVA indicated a significant difference between groups (P<.001). SBS in group II (Light Bond+Fluorosis) were significantly lower than other groups. ARI scores of the groups were also significantly different (P<.001). There was a greater frequency of ARI scores of 1,2 and 3 in group II (Light Bond+Fluorosis).Conclusions: When standard etching protocol was used enamel fluorosis significantly decreased the bond strength of orthodontic brackets. Satisfactory bond strengths were obtained when SEP was used for bonding brackets to the fluorosed teeth. (Eur J Dent 2009;3:173-177)

scholarly journals The Impact of Chlorhexidine Mouth Rinse on the Bond Strength of Polycarbonate Orthodontic Brackets

2014 ◽  
Vol 15 (6) ◽  
pp. 688-692 ◽  
Author(s):  
Sukumaran Anil ◽  
Farouk Ahmed Hussein ◽  
Mohammed Ibrahim Hashem ◽  
Elna P Chalisserry
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Test Group ◽  
Orthodontic Brackets ◽  
Control Group ◽  
Mouth Rinse ◽  
Significant Difference ◽  
Bond Strengths ◽  
The Impact

ABSTRACT Objective The purpose of the current in-vivo study was to assess the effect of using 0.12% chlorhexidine (CHX) mouth rinse, before bonding, on shear bond strength of polycarbonate brackets bonded with composite adhesive. Subjects and methods Eighteen orthodontic patients with a mean age 21.41 ± 1.2 years, who were scheduled to have 2 or more first premolars extracted, were included in this study. Patients were referred for an oral prophylaxis program which included, in part, the use of a mouth rinse. Patients were divided into 2 groups, a test group of 9 patients who used 0.12% CHX gluconate mouth rinse twice daily and a control group of 9 patients who used a mouth rinse without CHX, but with same color. After 1 week, polycarbonate brackets were bonded to first premolars with Transbond XT composite adhesive. Premolars were extracted after 28 days and tested for shear bond strength on a universal testing machine. Student's t-test was used to compare shear bond strengths of both groups. Results No statistically significant difference was found in bond strengths’ values between both groups. The test group (with CHX) has mean shear bond strength of 14.21 ± 2.42 MPa whereas the control group (without CHX) revealed a mean strength of 14.52 ± 2.31 MPa. Conclusion The use of 0.12% CHX mouth rinse, for one week before bonding, did not affect the shear bond strength of polycarbonate brackets bonded with Transbond composite. Furthermore, these brackets showed clinically acceptable bond strength. How to cite this article Hussein FA, Hashem MI, Chalisserry EP, Anil S. The Impact of Chlorhexidine Mouth Rinse on the Bond Strength of Polycarbonate Orthodontic Brackets. J Contemp Dent Pract 2014;15(6):688-692.

scholarly journals Shear bond strength of bulk-fill and nano-restorative materials to dentin

2016 ◽  
Vol 10 (01) ◽  
pp. 040-045 ◽  
Author(s):  
Hakan Colak ◽  
Ertugrul Ercan ◽  
Mehmet Mustafa Hamidi
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Clinical Success ◽  
Testing Machine ◽  
Group Iv ◽  
Composite Resins ◽  
Group Iii ◽  
Bonding System ◽  
Group I ◽  
Significant Difference

ABSTRACT Objectives: Bulk-fill composite materials are being developed for preparation depths of up to 4 mm in an effort to simplify and improve the placement of direct composite posterior restorations. The aim of our study was to compare shear-bond strength of bulk-fill and conventional posterior composite resins. Materials and Methods: In this study, 60 caries free extracted human molars were used and sectioned parallel to occlusal surface to expose midcoronal dentin. The specimens were randomly divided into four groups. Total-etch dentine bonding system (Adper Scotchbond 1XT, 3M ESPE) was applied to dentin surface in all the groups to reduce variability in results. Then, dentine surfaces covered by following materials. Group I: SonicFill Bulk-Fill, Group II: Tetric EvoCeram (TBF), Group III: Herculite XRV Ultra, and Group IV: TBF Bulk-Fill, 2 mm × 3 mm cylindrical restorations were prepared by using application apparatus. Shear bond testing was measured by using a universal testing machine. Kruskal–Wallis and Mann–Whitney U-tests were performed to evaluate the data. Results: The highest value was observed in Group III (14.42 ± 4.34) and the lowest value was observed in Group IV (11.16 ± 2.76) and there is a statistically significant difference between these groups (P = 0.046). However, there is no statistically significant difference between the values of other groups. In this study, Group III was showed higher strength values. Conclusion: There is a need for future studies about long-term bond strength and clinical success of these adhesive and bulk-fill systems.

scholarly journals Comparison of the Shear bonding Strength of ION-Z GIC to a Resin Composite Using Different Adhesive Systems: RCT Study

2020 ◽  
Author(s):  
Sana Lala ◽  
Thuraya Lazkani
Keyword(s):  
Bond Strength ◽  
Bonding Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Self Etch ◽  
Shear Bonding Strength

Abstract Background:In restorative dentistry we usually use Sandwich Technique for posterior restorations where GIC is placed below and a resin composite is placed over it. The bonding strength between these two materials are low. We are looking for the best adhesive system to put it in between. We think that the self-etching bond will give the best bonding strength between them whereas total etch will give lower bonding strength than self-etching system. Methods:ION-Z GIC was bonded to resin composite by using two different bonding agents. The thirty specimens used were prepared by using acrylic blocks with holes in each hole to retain the ION-Z GIC. The specimens were randomly divided into three groups:Group I: Control group.Group II: Total-etch adhesive was applied and cured over ION-Z GIC.Group III: Self-etch adhesive was applied and cured.The composite resin placed over the ION-Z GIC and cured. The shear bond strength was measured by shearing of the bonded specimens on Universal Testing Machine (Model 114) using speed of 0.1mm / minute. The reading was tabulated and subjected to statistical analysis using ANOVA and Tukey's test.Results:The test showed statistically significant difference between Group III and Group I and between Group III and Group II. Group III had the highest shear bonding strength.Conclusion:Self-etch adhesive agent produces have better shear bond strength to ION-Z than total-etch adhesive and to the group without any bonding agent.

Resistência de união ao cisalhamento entre a resina composta e dentes artificiais de resina acrílica

2021 ◽  
Vol 10 (40) ◽  
pp. 33-37
Author(s):  
Joyce de Figueiredo Meira Barbosa ◽  
Lara Pepita de Souza Oliveira ◽  
Marcelo Nascimento Bruce ◽  
Jonas Alves Oliveira ◽  
Ligia Regina Mota Vasconcelos ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Single Bond ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Artificial Teeth

Acrylic denture teeth may suffer fracture or wear requiring the need for repair. This study aimed to evaluate the shear bond strength between acrylic resin artificial teeth restored with composite resin (with two different surface treatments) and acrylic resin (AR), simulating repair with these materials. Thirty artificial incisors were included by the palatal side in a circular microwave-polymerized AR base and polished on their buccal side with 120 and 320 grit sandpaper in a metallographic polisher and, then, divided into three groups: (I) restoration with self-cured AR; (II) conventional restoration with Z-100 composite resin with application of acid etching and Single Bond-3M adhesive; and (III) restoration with Z-100 composite resin with submersion for 30 seconds in acetone and application of Single Bond-3M adhesive. Shear bond strength tests were performed in a Universal Testing Machine (Instron). The results were submitted to ANOVA and Tukey (p<0.05) tests, in which Group I (33.26MPa ±10.76) and Group III (22.24MPa ±13.13) showed no statistically significant difference, but both were superior to Group II (10.31MPa ±5.62), which showed a lower value of shear bond strength. It can be concluded that composite resin restoration with acetone pretreatment can be a viable alternative for repair.

scholarly journals Comparison of the Shear bonding Strength of ION-Z GIC to a Resin Composite Using Different Adhesive Systems: RCT Study

2021 ◽  
Author(s):  
Sana Lala ◽  
Thuraya Lazkani
Keyword(s):  
Bond Strength ◽  
Bonding Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Self Etch ◽  
Shear Bonding Strength

Abstract Background:In restorative dentistry we usually use Sandwich Technique for posterior restorations where GIC is placed below and a resin composite is placed over it. The bonding strength between these two materials are low. We are looking for the best adhesive system to put it in between. We think that the self-etching bond will give the best bonding strength between them whereas total etch will give lower bonding strength than self-etching system. Methods:ION-Z GIC was bonded to resin composite by using two different bonding agents. The thirty specimens used were prepared by using acrylic blocks with holes in each hole to retain the ION-Z GIC. The specimens were randomly divided into three groups:Group I: Control group.Group II: Total-etch adhesive was applied and cured over ION-Z GIC.Group III: Self-etch adhesive was applied and cured.The composite resin placed over the ION-Z GIC and cured. The shear bond strength was measured by shearing of the bonded specimens on Universal Testing Machine (Model 114) using speed of 0.1mm / minute. The reading was tabulated and subjected to statistical analysis using ANOVA and Tukey's test.Results:The test showed statistically significant difference between Group III and Group I and between Group III and Group II. Group III had the highest shear bonding strength.Conclusion:Self-etch adhesive agent produces have better shear bond strength to ION-Z than total-etch adhesive and to the group without any bonding agent.

scholarly journals Comparison of Shear Bond Strength of Two Commercially Available Bondable Molar Tubes

2019 ◽  
Vol 9 (1) ◽  
pp. 11-14
Author(s):  
Vivek Bikram Thapa ◽  
Amrita Shrestha ◽  
Prabesh Sherchan ◽  
Prakash Poudel ◽  
Luna Joshi
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Patient Comfort ◽  
Maxillary Molars ◽  
Indirect Bonding ◽  
Group I ◽  
Significant Difference ◽  
Bond Strengths ◽  
Base Design

 Introduction: Direct and indirect bonding has revolutionized clinical orthodontics by reducing chair-side time and enhancing patient comfort. Clinicians often hesitate to bond molars due to ambiguity on shear bond strength. This study was conducted to compare shear bond strengths of two commercially available bondable molar tubes. And asses mesh if the mesh design had a role to play in differences in shear bond strength. Materials & Method: 30 extracted maxillary molars were divided into Group I and II (n=15).Group I bonded with Victory series MBT (3M Unitek). And Group II bonded with Ortho classic proprietary Pad- Lok (Navy orthodontics). Teeth were mounted on a jig and Shear Bond Strength was evaluated on an Instron universal testing machine at a cross head speed of 1mm/minute. They were also subjected to scanning microscopic examination to check the base pattern. Result: Shear bond strength of navy orthodontic tubes were (18.0675+/- 4.0187 MPa) was significantly higher than 3M victory series (8.93 +/2.493MPa). Unpaired T-test shows a higher significant difference in SBS between two groups at 1% of significance. SME showed that navy orthodontic tube base was pad-lock mesh design, while 3M was a single mesh base design. Conclusion: 3M victory series molar tube exhibited a near ideal while other sample showed far higher shear bond strength than recommended. Higher values may result in enamel fracture.

scholarly journals Pengaruh bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit

2017 ◽  
Vol 2 (1) ◽  
pp. 35
Author(s):  
Ema Mulyawati
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Group Iii ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Group I ◽  
Significant Difference

The Effect of desensitizing agent in post-extracoronal bleaching on shear bond strength of composite resin. The dentinal hypersensitivity is a common condition among patients after extracoronal bleaching treatment that usually needs the application of desensitizing agent. The purpose of this study was to evaluate the composite resin restoration shear bond strength with and without desensitizing application after extracoronal bleaching using 40% of H2O2. Twenty one extracted permanent human incisor teeth were randomly divided into 3 groups of 7 each. Group I was with the application of 40% H2O2 without any desensitizing agent. Group II was with the application of 40% of H2O2 with desensitizing agent and group III served as the control. The teeth were immersed in artificial saliva and stored in 37 °C incubator for 7 days. The teeth were restored using composite resin. After restoring the shear bond strength of composite resin was tested using a universal testing machine. Result and conclusion. there is no significant difference between bleaching group with and without desensitizing agent. The application of desensitizing agent after extracoronal bleaching did not impact the composite resin shear bond strength.ABSTRAKDentin hipersensitif merupakan kondisi yang biasa dialami pasien setelah perawatan bleaching ekstrakoronal yang biasanya memerlukan aplikasi bahan desensitasi. Penelitian ini bertujuan untuk mengetahui pengaruh bahan desensitasi pasca bleaching ekstrakoronal menggunakan H2O2 40% terhadap kekutan geser pelekatan restorasi resin komposit. Dua puluh satu gigi permanen insisivus yang telah dicabut dibagi dalam tiga kelompok masing-masing 7 gigi. Kelompok I dilakukan bleaching ekstrakoronal dengan H2O2 tanpa bahan desensitasi. Kelompok II dilakukan bleaching setelah itu diaplikasikan bahan desensitasi dan kelompok III sebagai kelompok kontrol. Semua gigi-gigi tersebut di rendam dalam saliva buatan dan dimasukkan inkubator selama 7 hari pada suhu 37 °C. Selanjutnya seluruh gigi dilakukan restorasi resin komposit menggunakan light cure halogen. Setelah itu dilakukan pengujian kekuatan geser pelekatan menggunakan universal testing machine. Data dianalisis menggunakan uji Kruskal - Wallis. Hasil penelitian menunjukkan bahwa tidak ada perbedaan kekuatan geser pelekatan pada semua kelompok perlakuan (p > 0,05). Dari penelitian ini disimpulkan bahwa tidak terdapat pengaruh aplikasi bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit.

scholarly journals A comparative study on effect of different methods of recycling orthodontic brackets on shear bond strength

2020 ◽  
Author(s):  
Purna Prasad Khanal ◽  
Basanta Kumar Shrestha ◽  
Rajiv Yadav ◽  
Sanjay Prasad Gupta
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Group Iv ◽  
Orthodontic Brackets ◽  
Ultrasonic Cleaning ◽  
Group Iii ◽  
Group I ◽  
Adhesive Remnant Index ◽  
Group Ii

Abstract Background: Recycling the old or debonded bracket is one possible alternative to the replacement with new bracket. The aim of this study was to evaluate and compare the effect of different methods of recycling stainless steel orthodontic brackets on shear bond strength.Methods: One hundred twenty human premolars extracted for orthodontic purpose were randomly divided into four groups. Standard MBT (0.022”) brackets, (Leone co., Sesto, Florentine, Florence, Italy) were bonded on buccal surface of all samples with light cured adhesive primer Orthosol (Enlight, Ormco corp., USA) using LED curing unit for 10 seconds. Group I was assigned as control and the brackets of Group II, Group III and Group IV were subjected to recycling by flaming (Gas microtorch: RS Pro, Nozzle, MT 790) ,flaming with sandblasting (Bio-Art sandblaster; Rua Teotônio Vilela, Brazil) and flaming with ultrasonic cleaning (Ultrasonic cleaning unit ,Confident dental equipments Ltd, India) respectively. The recycled brackets were rebonded and final debonding of all brackets was done with universal testing machine (AG-IC/100 KN, Shimadzu, Japan) at a crosshead speed of 0.5mm/min and shear bond strength (MPa) was determined. The adhesive remnant index was evaluated by stereomicroscope at 10X magnification (Olympus corp., Japan). Results: The highest shear bond strength was obtained with Group I (10.35 ± 0.46 MPa), followed by Group III (9.36 ± 0.55 MPa), Group IV (5.97 ± 0.66 MPa) and the least value was obtained with Group II (4.30 ± 0.55 Mpa). Significant differences among the groups were detected by analysis of variance. Tukey post hoc multiple comparison test showed that the shear bond strength of each group was significantly different from one another (p < 0.001). The Chi-square showed statistically significant differences in the adhesive remnant index of the 4 groups (p < 0.001). Conclusions: Shear bond strength of new brackets was significantly higher than that of the recycled brackets. Among recycled brackets, flaming with sandblasting provided adequate shear bond strength, flaming with ultrasonic cleaning provided borderline value for clinical use while flaming alone led to significantly lower value.

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