scholarly journals Chemo-Mechanical Approach to Improve Repair Bond Strength of Denture Teeth

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zahra A. AlZaher ◽  
Danah F. Almaskin ◽  
Masoumah S. Qaw ◽  
Tahani H. Abu Showmi ◽  
Reem Abualsaud ◽  
...  
Keyword(s):  
Bond Strength ◽  
Thermal Cycling ◽  
Surface Treatment ◽  
Coupling Agent ◽  
Shear Bond Strength ◽  
Silane Coupling Agent ◽  
Testing Machine ◽  
Control Group ◽  
Denture Base ◽  
Silane Coupling

Background. Detachment of acrylic teeth from denture base material is a common complication in dentistry which accounts for 26–30% of repair cases. This study aimed to evaluate the effect of alumina-blasting, silane coupling agent, and thermal cycling on the shear bond strength of repaired teeth to denture base. Materials and Methods. Specimens (140) of repaired teeth to denture bases were fabricated and divided into 14 groups: 7 groups before thermal cycling and 7 groups after thermal cycling (n = 10). The groups were divided according to surface treatment into no treatment (control), treatment of the base (B), the tooth (T), or both (BT). Each group was further subdivided according to the surface treatment method into alumina-blasting or alumina-blasting and silane coupling agent. After treatment, acrylic discs and teeth were fixed in a jig, and the repair procedure was done. Half the specimens were thermally cycled. Shear bond strength was measured using a universal testing machine. ANOVA and Tukey HSD tests were performed at α = 0.05. Results. Surface treatment significantly improved the bond strength compared to the control group P < 0.001 . Comparing surface treatments, alumina-blasting with silane coupling agent treatment resulted in significantly higher strength compared to alumina-blasting alone P < 0.001 . The BT group treated with alumina-blasting and silane coupling agent showed the highest significant shear bond strength (23.91 ± 0.96 MPa) P < 0.001 . Significant drop in strength value was observed in all groups after thermal cycling P < 0.004 except the BT group treated with alumina-blasting P = 0.096 . Conclusion. Surface treatment using alumina-blasting with silane coupling agent for denture base and tooth increased repair strength.

scholarly journals Comparative Study of Shear Bond Strength of Recycled Brackets using different Recycling Techniques – An in vitro study

2016 ◽  
Vol 6 (2) ◽  
pp. 33-36
Author(s):  
Rajeshwar Singh ◽  
Varunjeet Chaudhary ◽  
Seema Lahoti ◽  
Kapil Lahoti
Keyword(s):  
Bond Strength ◽  
Coupling Agent ◽  
Shear Bond Strength ◽  
Silane Coupling Agent ◽  
Testing Machine ◽  
Tooth Surface ◽  
Control Group ◽  
Bond Failure ◽  
Silane Coupling ◽  
Experimental Group

Introduction: The debonding of brackets is common in orthodontic practice. It may be due to bond failure or as a need for bracket repositioning. Typically practitioners shall discard dislodged brackets and replace it with a new bracket or reuse the bracketObjective: To compare and evaluate the shear bond strength of recycled orthodontic brackets using different methods.Materials & Method: A total of 50 extracted premolars and 50 metal brackets with a slot configuration of 0.022”x0.028” were used. All samples were divided into 5 groups with 10 samples each. Each group was further divided into 2 groups which were control group and experimental group. Experimental group was further subdivided into four recycle sub-groups. Tooth surface were prepared for bonding then brackets were bonded. The specimens were tested on Universal Testing Machine for shear bond strength. The force producing bond failure was recorded in Newtons (N) and converted into megapascals (Mpa).Result: Shear bond strength of control group was maximum among all recycled groups. Shear bond strength of recycled brackets bonded with silane coupling agent and recycled with flaming, electropolishing, sandblasting and ultrasonic cleaning was equivalent to the control group. Brackets recycled with flaming and sandblasting had less shear bond strength as compared to control group. Brackets recycled with flaming and electropolishing were having the least shear bond strength.Conclusion: Brackets recycled with flaming, ultra sonic scaling, electropolishing and treated with silane coupling agent was recorded with highest shear bond strength. Sandblasting of metal brackets to remove composite residue, had insignificant effect on the shear bond strength. Hence sandblasting should be considered as viable, time saving and convenient method of recycling. 

scholarly journals Shear Bond Strength of Acrylic Teeth to Acrylic Denture Base after Different Surface Conditioning Methods

2013 ◽  
Vol 14 (5) ◽  
pp. 892-897 ◽  
Author(s):  
Nidhi Mehta ◽  
Gajula Venu Madhav ◽  
Soundar Raj ◽  
Naveen Yadav ◽  
Ishitha Mudgal ◽  
...  
Keyword(s):  
Bond Strength ◽  
Coupling Agent ◽  
Shear Bond Strength ◽  
Silane Coupling Agent ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Denture Base ◽  
Surface Conditioning ◽  
Biological Compatibility ◽  
Silane Coupling

ABSTRACT Background and Objectives Acrylic resin ruled the dental profession for 60 years, and this success is attributed to its aesthetics, handling properties, physical and biological compatibility, its stability in oral environment and its cost effectiveness. The objective of this study is to evaluate and compare the bond strength of acrylic resin teeth treated with various conditioning materials like monomer and silane coupling agent. Methdology A study was carried out in which 96 samples were grouped into 3 groups with a sample size of 32 each (16 premolars, 16 molars). They were conditioned with different conditioning materials i,e monomer and silane coupling agent. Monomer, Silane coupling agent are coated on the ridge lap area before thermocycling and cured according to the manufacturer recommendations. The samples are retained from the flask; trimmed and polished. The samples are then subjected to shear bond strength using the Insteron Universal Testing Machine. Results In the present study it was found that application of monomer increased the bond strength between acrylic teeth and denture base, when compared to the conventionally processed samples. However it was found that application of silane coupling agent further increased the shear bond strength between acrylic teeth and denture base. Interprations and conclusions Within the confines of this study it is found that there was a significant improvement in the bond strength between the acrylic teeth and denture base when silane coupling agent and monomer were used as surface conditioning material. The order of shear strength of samples is control > monomer > silane coupling agent. How to cite this article Madhav GV, Raj S, Yadav N, Mudgal I, Mehta N, Tatwadiya R. Shear Bond Strength of Acrylic Teeth to Acrylic Denture Base after Different Surface Conditioning Methods. J Contemp Dent Pract 2013;14(5):892-897.

Evaluation of Shear Bond Strength of Prepared Samples of Silorane Composite Repaired with Silorane

2021 ◽  
Vol 15 (6) ◽  
pp. 1246-1248
Author(s):  
H. Asghar ◽  
M. Rasheed ◽  
H. Khawaja ◽  
H. N. Naseem ◽  
Z. Arooj ◽  
...  
Keyword(s):  
Bond Strength ◽  
Thermal Cycling ◽  
Coupling Agent ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Adhesive Bond ◽  
Bonding Interface ◽  
Control Group ◽  
Experimental Group ◽  
Composite Samples

Aim: To evaluate shear bond strength of silorane based composite samples repaired with silorane composite with application of silane coupling agent and adhesive bond of silorane before and after thermal cycling. Study design: Experimental study Place and duration of study: Science of Dental Materials Department, de’Montmorency College of Dentistry Lahore from 1st January 2014 to 31st October 2014. Methodology: Sixty composite specimens equally divided into control and experimental groups. Control group was further prepared for repair procedure after polymerization without thermal cycling while experimental group was given with 5000 thermal cycles between temperature range of 5-55oC, dwell time of 20 seconds) before testing, all samples were surface roughened with 400 grit silicon carbide strip, followed by application of silorane coupling agent and adhesive bond of silorane over the substrate and cured for 20 seconds. Repair silane based composite was applied on all substrate silorane composite samples and polymerized, before testing samples were left in distilled water (24 hour at 37oC) and tested with universal testing machine (crosshead speed 0.5 mm/min) until fracture. Results: There is 12 (20%) adhesive, mixed 2 (3.3%) and cohesive is 46 (76.7%). The thermal cycling has no effect on bonding interface in experimental group on strength at bonding interface. Conclusion: Silorane based composite as repair composite gave better strength with silorane based composite and can be used for repair options. Keywords: Shear bond strength, Silorane based composite, Silorane adhesive bond

Evaluating Various Preparation Protocols on the Shear Bond Strength of Repaired Composite

2017 ◽  
Vol 18 (3) ◽  
pp. 182-187
Author(s):  
Ayah A Al-Asmar ◽  
Khaled S Hatamleh ◽  
Muhanad Hatamleh ◽  
Mohammad Al-Rabab'ah
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Coupling Agent ◽  
Shear Bond Strength ◽  
Silane Coupling Agent ◽  
Acid Etching ◽  
Air Abrasion ◽  
Group V ◽  
Silane Coupling ◽  
Phosphoric Acid Etching

ABSTRACT Introduction The aim of this study is to evaluate the effect of different combinations of various surface treatments on the shear bond strength (SBS) of repaired composite resin. Materials and methods A total of 122 composite samples were prepared from Filtek Z350 XT. Samples were light cured and stored for 6 weeks. Surface treatment of old composite was done in five groups: Group I: bur roughening + phosphoric acid etching, group II: bur roughening + hydrofluoric acid etching + silane coupling agent, group II: air abrasion + phosphoric acid etching, group IV: air abrasion + phosphoric acid etching + silane coupling agent, group V: air abrasion + hydrofluoric acid etching + silane coupling agent. Bonding agent was applied to all surface-treated old composites and light cured. The fresh composite resin was bonded to treated surfaces and cured and stored in water at 37°C for 6 weeks. Shear bond strength was measured by a universal testing machine. Results Shear bond strength values of all groups were not statistically significant except for group V, which showed statistically significant higher SBS than group III. Conclusion Techniques with readily available materials at the clinic can attain similar SBS to more elaborate technique involving potentially hazardous materials. How to cite this article Al-Asmar AA, Hatamleh KS, Hatamleh M, Al-Rabab'ah M. Evaluating Various Preparation Protocols on the Shear Bond Strength of Repaired Composite. J Contemp Dent Pract 2017;18(3):182-187.

scholarly journals Bond Strength of Orthodontic Brackets to Temporary Crowns: In Vitro Effects of Surface Treatment

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Suliman Y Shahin ◽  
Tahani H. Abu Showmi ◽  
Sadeem H. Alzaghran ◽  
Hoda Albaqawi ◽  
Latifah Alrashoudi ◽  
...  
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Shear Bond Strength ◽  
Orthodontic Treatment ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Control Group ◽  
Number Of Patients ◽  
Conventional Manner

Background. The number of patients seeking orthodontic treatment has been consistently increasing. During orthodontic treatment, it is recommended to place the provisional restoration and to delay the final restoration until completion of orthodontic treatment. Recurrent bracket debonding necessitates orthodontists to prepare the bonding area with special measures. Objective. This study aimed to evaluate the effect of different grit sizes of diamond burs and sandblasting surface treatment on the shear bond strength of orthodontic brackets to provisional crowns. Materials and Methods. A total of 75 discs were fabricated from a bisacrylic composite and divided into 5 groups (n = 15) according to surface treatment by black, blue, and green diamond burs and sandblasting in addition to a control group. Metal orthodontic brackets were bonded to discs in a standardized conventional manner. All specimens were subjected to thermocycling with 5000 cycles of alternating 5°C and 55°C waterbaths. The shear bond strength test was performed using a universal testing machine. A scanning electron microscope (SEM) was used to analyze the surface treatment effect and features of debonded surfaces. The amount of composite resin left on the specimen surfaces was analyzed and classified with the adhesive remnant index. One-way ANOVA was performed at α = 0.05. Results. The shear bond strength of specimens treated with sandblasting was significantly higher than that of the control group under thermal aging conditions ( p = 0.022 ), as well as blue burs ( p = 0.001 ), while no significant differences were found between different grit diamond burs and the controls ( p > 0.05 ). Conclusion. Under thermocycling conditions, sandblasting of provisional crowns increases the bond strength of orthodontic brackets.

scholarly journals Comparative Effectiveness of Multiple Laser Scanning and Conventional Techniques on Zirconia Shear Bond Strength

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 422
Author(s):  
Adil Othman Abdullah ◽  
Yu Hui ◽  
Sarah Pollington ◽  
Fenik Kaml Muhammed ◽  
Xudong Sun ◽  
...  
Keyword(s):  
Contact Angle ◽  
Phase Transformation ◽  
Bond Strength ◽  
Surface Treatment ◽  
Shear Bond Strength ◽  
Laser Scanning ◽  
Testing Machine ◽  
Control Group ◽  
Zirconia Coating ◽  
The Impact

This study aimed to compare the impact of different laser scanning with that of conventional methods on zirconia surface treatment through evaluation of shear bond strength (SBS) values. One hundred and thirty-two sintered zirconia cubic-samples were prepared and randomly divided into six study groups: milling control (without surface treatment); grinding; sandblasting; and three-times, four-times, and five-times laser scanning groups. The treatment process for the first three groups was performed before the zirconia coating, while the last three groups were treated after zirconia coating with veneer slurry through a spraying technique. In the current study, the surface roughness Ra, contact angle measurement, phase transformation, topography and interfaces, SBS in unaged and aged conditions, and fracture mode patterns of zirconia cores were investigated. The results were analyzed using laser confocal scanning microscopy, drop analyzer, X-ray diffractometry (XRD), scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), universal testing machine and stereomicroscope. The results indicated that three-times laser scanned specimens presented higher Ra values than the other studied groups. The minimum contact angle value was detected in the mentioned group, while the control group presented the highest value. The XRD showed phase transformation from tetragonal to monoclinic t–m following grinding and sandblasting. However, the laser scanned specimens and the control group preserved the structural integrity of the zirconia core, presenting the tetragonal phase only. The highest SBS values were recorded in specimens treated with three-times laser scanning in the unaged and aged conditions. A mixed fracture was a common fracture pattern among the studied groups. The results confirmed that SBS could be optimized through three-times laser scanning and it provided better adhesion between zirconia and the veneer ceramic material. Multiple scanning processes of more than three times are not recommended for zirconia surface treatment.

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