scholarly journals Pulpal Thermal Changes following Er-YAG Laser Debonding of Ceramic Brackets

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Didem Nalbantgil ◽  
Murat Tozlu ◽  
Mehmet Oguz Oztoprak
Keyword(s):  
Bond Strength ◽  
Cooling Water ◽  
Study Groups ◽  
Control Group ◽  
Laser Exposure ◽  
Water Cooling ◽  
Yag Laser ◽  
Significant Difference ◽  
Ceramic Brackets ◽  
Bond Strengths

Lasers are effective in debonding ceramic brackets. Unfortunately, while reducing the adhesive bond strength, lasers are also reported to increase pulpal temperature. The aim of this study was to evaluate the shear bond strengths and temperature increase levels after debonding ceramic brackets using an Er-YAG laser with or without water-cooling. Sixty polycrystalline upper premolar ceramic brackets were placed on the labial surface of sixty human premolar teeth which were randomly divided into three groups of twenty. A laser pulse at 5 W for 9 seconds was delivered to each bracket in both study groups either with water-cooling (water group) or without water-cooling (waterless group) using an Er-YAG laser. Debonding was performed 45 seconds after laser exposure and shear bond strengths were measured. Data comparison revealed a statistically significant difference between the groups. Mean temperature increases of 2.41°C and 4.59°C were recorded for the water and waterless laser groups, respectively. The shear bond strength value for the control group was 22.76 MPa and 10.46 and 6.36 MPa for the water and waterless laser groups, respectively. The application of Er-YAG laser with water-cooling was an efficient and safe method of debonding ceramic brackets.

scholarly journals Effect of Using Nano and Micro Airborne Abrasive Particles on Bond Strength of Implant Abutment to Prosthesis

2015 ◽  
Vol 26 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Mansour Rismanchian ◽  
Amin Davoudi ◽  
Elham Shadmehr
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Control Group ◽  
Abrasive Particles ◽  
Significant Difference ◽  
Implant Abutments ◽  
Implant Abutment ◽  
Roughened Surface ◽  
Bond Strengths ◽  
Spss Software

Connecting prostheses to the implant abutments has become a concern and achieving a satisfactory retention has been focused in cement-retention prostheses recently. Sandblasting is a method to make a roughened surface for providing more retention. The aim of this study was to compare effects of nano and micro airborne abrasive particles (ABAP) in roughening surface of implant abutments and further retention of cemented copings. Thirty Xive abutments and analogues (4.5 D GH1) were mounted vertically in self-cured acrylic blocks. Full metal Ni-Cr copings with a loop on the top were fabricated with appropriate marginal adaptation for each abutment. All samples were divided into 3 groups: first group (MPS) was sandblasted with 50 µm Al2O3 micro ABAP, second group (NSP) was sandblasted with 80 nm Al2O3 nano ABAP, and the third group (C) was assumed as control. The samples were cemented with provisional cement (Temp Bond) and tensile bond strength of cemented copings was evaluated by a universal testing machine after thermic cycling. The t test for independent samples was used for statistical analysis by SPSS software (version 15) at the significant level of 0.05. Final result showed significant difference among all groups (p<0.001) and MPS manifested the highest mean retention (207.88±45.61 N) with significant difference among other groups (p<0.001). The control group showed the lowest bond strength as predicted (48.95±10.44 N). Using nano or micro ABAP is an efficient way for increasing bond strengths significantly, but it seems that micro ABAP was more effective.

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.

The Efficacy of Different Sealer Removal Protocols on the Microtensile Bond Strength of Adhesives to a Bioceramic Sealer-Contaminated Dentin

2021 ◽  
Author(s):  
Zeliha Gonca Bek Kürklü ◽  
Oğuz Yoldaş
Keyword(s):  
Bond Strength ◽  
Root Canal ◽  
Calcium Silicate ◽  
Single Step ◽  
Cavity Surface ◽  
Control Group ◽  
Root Canal Sealer ◽  
Universal Adhesive ◽  
Significant Difference ◽  
Bond Strengths

Abstract Background: The optimal bonding of adhesives to dentin requires the sealer to be completely removed from dentinal walls. This study compared the efficacy of different sealer removal protocols on the microtensile bond strengths (MTBS) of single step adhesives to a calcium silicate-based bioceramic root canal sealer contaminated dentin. Methods: Standardized box-shaped Class I cavities were prepared in human lower third molars (N=50). All cavities were contaminated with a bioceramic root canal sealer (Endosequence BC Sealer, Brasseler, Savannah, USA), except the control group cavities. For the experimental groups, dentin surfaces were wiped with dry cotton pellets, cotton pellets saturated with water or rinsed with an air water syringe for 5 seconds, or applied aqueous ultrasonic scaler for 5 seconds prior to restoration procedure. All the cavity surface was restored with a one-bottle universal adhesive and composite resin. All the specimens were subjected to both thermocycling and mechanical loading. The restored specimens were sectioned into resin-dentin beams for mictotensile bond strength (Mtbs) evaluation. Additional specimens were prepared for scanning electron microscopy (SEM) to examination of dentin-adhesive interface (N=10).Results: The Mtbs for the 5 groups, the control, dry cotton, wet cotton, water rinse, and ultrasonic rinse group, were 13.42 ± 4.68, 11.96 ± 5.26, 13.03±6.07, 12.73±3.68, and 14.39±4.22 MPa, respectively. No significant difference was found between the mean bond strengths of the groups (p=0.725). In SEM examination no residual sealer was found in any group. Conclusions: Calcium silicate-based bioceramic sealer was removed from the dentin surface with all removal protocols when evaluated with Mtbs after thermal and mechanical cycle tests.

scholarly journals Thermocycling Effects on Shear Bond Strength of a Self-Etching Primer

2008 ◽  
Vol 78 (2) ◽  
pp. 351-356 ◽  
Author(s):  
Selma Elekdag-Turk ◽  
Tamer Turk ◽  
Devrim Isci ◽  
Nurhat Ozkalayci
Keyword(s):  
Bond Strength ◽  
Conventional Method ◽  
Control Group ◽  
Thermal Cycles ◽  
Bond Failure ◽  
Adhesive Remnant Index ◽  
Significant Difference ◽  
Bond Strengths ◽  
Failure Location ◽  
Experimental Group

Abstract Objective: To determine the effects of thermocycling on shear bond strengths (SBSs) of a self-etching primer (SEP) after 0, 2000, and 5000 thermal cycles. Materials and Methods: Brackets were bonded to bovine incisors with two etching protocols. In the control group (conventional method) teeth were etched with 37% phosphoric acid. In the experimental group, an SEP (Transbond Plus) was applied as recommended by the manufacturer. Brackets were bonded with light-cure adhesive paste (Transbond XT) and light cured for 20 seconds in both groups. The SBSs were measured after water storage at 37°C for 24 hours, after 2000 and 5000 cycles of thermocycling between 5°C and 55°C. Bond failure location was determined with the Adhesive Remnant Index (ARI). Results: In the control group, SBSs did not show any significant differences among 0, 2000, and 5000 thermal cycles. However, in group SEP, SBSs decreased with 2000 and 5000 thermal cycles, and these decreases were significantly different from no thermocyling (P &lt; .001). A significant difference was observed between ARI scores of the control group with 5000 thermal cycles and group SEP with no thermal cycles (P &lt; .003). In addition, a significant difference was found between group SEP with no thermocycling and with 5000 thermal cycles (P &lt; .003). Conclusion: The results of this study indicate that the SEP (Transbond Plus) provides clinically acceptable bond strength values compared with the conventional method after thermocycling.

scholarly journals Effect of Different Surface Treatments for Ceramic Bracket Base on Bond Strength of Rebonded Brackets

2015 ◽  
Vol 26 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Monique Kruger Guarita ◽  
Alexa Helena Köhler Moresca ◽  
Estela Maris Losso ◽  
Alexandre Moro ◽  
Ricardo Cesar Moresca ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Silica Coating ◽  
Surface Treatments ◽  
Enamel Surface ◽  
Control Group ◽  
Significant Difference ◽  
Ceramic Brackets ◽  
Ceramic Bracket ◽  
Bracket Base

The aim of this study was to evaluate the shear bond strength of rebonded ceramic brackets after subjecting the bracket base to different treatments. Seventy-five premolars were selected and randomly distributed into five groups (n=15), according to the type of the bracket surface treatment: I, no treatment, first bonding (control); II, sandblasting with aluminum oxide; III, sandblasting + silane; IV, silica coating + silane; and V, silicatization performed in a laboratory (Rocatec system). The brackets were fixed on an enamel surface with Transbond XT resin without acid etching. The brackets were then removed and their bases were subjected to different treatments. Thereafter, the brackets were fixed again to the enamel surface and the specimens were subjected to shear bond strength (SBS) test. The adhesive remnant index (ARI) was then evaluated for each specimen. Data were subjected to ANOVA and Tukey's tests (α=0.05). A statistically significant difference was observed only between Rocatec and the other groups; the Rocatec group showed the lowest SBS values. The highest SBS values were observed for group 1, without any significant difference from the values for groups II, III and IV. Most groups had a higher percentage of failures at the enamel-resin interface (score 1). It was concluded that the surface treatments of rebonded ceramic brackets were effective, with SBS values similar to that of the control group, except Rocatec group.

scholarly journals Immediate and Delayed Effects of Diode Laser on Debonding of Ceramic Brackets: An in vitro Study

2016 ◽  
Vol 17 (4) ◽  
pp. 275-281
Author(s):  
N Rajvikram ◽  
P Rajakumar ◽  
R Saravanan ◽  
Praveena Anand ◽  
PB Anand ◽  
...  
Keyword(s):  
Bond Strength ◽  
Diode Laser ◽  
Wall Temperature ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Control Group ◽  
Delayed Effects ◽  
Significant Difference ◽  
Ceramic Brackets

ABSTRACT Aim The aim of the study is to evaluate the immediate and delayed effects of diode laser on debonding of ceramic brackets. Materials and methods A total of 60 human extracted premolar teeth were randomly assigned to three different treatment groups. All teeth were bonded with adhesive precoated (APC) ceramic brackets (3M Unitek). A total of 20 teeth were debonded without lasing (group 1), 20 immediately after lasing (group 2), and 20 1 hour after lasing (group 3). For the lasing groups (groups 2 and 3), access cavity was prepared on the occlusal surface to a 2 mm diameter. A transbond plus self-etching primer (3M Unitek, Monrovia, CA, USA) and APC PLUS clarity advanced brackets (3M, Unitek, Monrovia, CA, USA) were used. The shear bond strength (SBS) and adhesive remnant index (ARI) were measured. The internal pulpal wall temperature was noted for the laser groups. Results The mean SBS was 15.4, 11.57, and 11.79 MPa for groups 1 to 3 respectively. Post hoc test showed significant difference (p < 0.001) between the control group and the lased groups. For groups 2 and 3, the rise in temperature was at an average of 1.4 and 1.3°C respectively. Conclusion The SBS of APC brackets decreased by 33.3% on application of diode laser without increasing the internal pulp chamber wall temperature significantly. Shear bond strength remains more or less the same whether debonding is done immediately after lasing or 1 hour after lasing. Diode lasers increased the ARI scores and thus decreased the risk of enamel fracture. How to cite this article Anand P, Anand PB, Prabhakar R, Rajvikram N, Rajakumar P, Atali VR, Saravanan R. Immediate and Delayed Effects of Diode Laser on Debonding of Ceramic Brackets: An in vitro Study. J Contemp Dent Pract 2016;17(4):275-281.

scholarly journals An Investigation about the Influence of Bleaching on Shear Bond Strength of Orthodontic Brackets and on Enamel Colour

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Isabell Immerz ◽  
Peter Proff ◽  
Piero Roemer ◽  
Claudia Reicheneder ◽  
Andreas Faltermeier
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Tooth Enamel ◽  
Adhesive Bond ◽  
Control Group ◽  
Significant Difference ◽  
Ceramic Brackets ◽  
The Difference ◽  
Pre Treatment ◽  
Post Hoc

The aim of the study was to investigate the effect of bleaching on the colouration of tooth enamel and shear bond strength of orthodontic ceramic brackets based upon current whitening practice. The bleaching and bonding techniques were performed on extracted bovine teeth for the investigation of their colorimetric spectrum and the adhesive bond strength on surface enamel. One group was designated as the control group with no pre-treatment. Another group was treated with a 45% hydrogen peroxide solution prior to bonding. The difference in colour was expressed as the Euclidian distance ΔE. The resulting shear bond strength was analyzed and evaluated by scores of Adhesion Remnant Index. Statistical analysis was performed using the Kruskall-Wallis and post-hoc test. The colorimetric analysis revealed statistically significant differences between original and bleached as well as bleached and debonded teeth setting off a blue colour shift. Furthermore, statistically there was no significant difference noted in bonding strength between non-treated surfaces and those treated with peroxide. It can be concluded that peroxide pre-treatment does result in colour differences of teeth. Bonding and debonding procedures seem to have no statistically significant influence on the enamel colour using current materials.

scholarly journals Effect of Acidulated Phosphate Fluoride and Casein Phosphopeptide–Amorphous Calcium Phosphate Application on Shear Bond Strength of Orthodontic Brackets

2008 ◽  
Vol 78 (1) ◽  
pp. 129-133 ◽  
Author(s):  
Defne Keçik ◽  
Sevi Burçak Çehreli ◽  
Çağla Şar ◽  
Bahtiyar Ünver
Keyword(s):  
Calcium Phosphate ◽  
Bond Strength ◽  
Amorphous Calcium Phosphate ◽  
Shear Bond Strength ◽  
Control Group ◽  
Significant Difference ◽  
Acid Etch ◽  
Bond Strengths ◽  
Group 2 ◽  
Casein Phosphopeptide

Abstract Objective: To evaluate the effect of a recently introduced prophylactic agent, casein phosphopeptide–amorphous calcium phosphate (CPP-ACP), on shear bond strength of brackets and compare it with the effect of acidulated phosphate fluoride (APF). Materials and Methods: Forty-eight freshly extracted mandibular bovine incisors were used. Teeth were randomly divided into four groups (n = 12) as follows: group 1 served as control, and no pretreatment was performed on the enamel; group 2, enamel was treated with 1.23% APF and CPP-ACP, respectively; group 3, enamel was treated with CPP-ACP; and group 4, enamel was treated with 1.23% APF for 4 minutes. In all groups, brackets were bonded using a conventional acid-etch and bond system (Transbond XT, 3M Unitek, Monrovia, Calif). Bonded specimens were first stored in deionized water at 37°C for 24 hours, subjected to thermal cycling for 1000 cycles, and further stored in distilled water for 6 weeks before debonding procedures. After debonding, teeth and brackets were examined under a stereomicroscope at 10× magnification for any adhesive remaining, in accordance with the modified adhesive remnant index. Results: The shear bond strengths of all experimental groups were significantly higher than that of the control group (P &lt; .01). There was no significant difference between the shear bond strengths of the experimental groups (P &gt; .05). Conclusion: The use of CPP-ACP either alone or combined with APF could be considered as an alternative prophylactic application in orthodontic practice since it did not compromise bracket bond strength.

scholarly journals Effect of Trichloromethane on the Bond Strengths between Acrylic Teeth and Different Heat-cured Denture Bases: A Comparative Study

2012 ◽  
Vol 13 (6) ◽  
pp. 850-855
Author(s):  
N Venugopal Rao ◽  
D Lakshmayya Naidu ◽  
JSV Bharat ◽  
M Venugopal Reddy ◽  
P Naveen
Keyword(s):  
Bond Strength ◽  
Comparative Study ◽  
Testing Machine ◽  
Control Group ◽  
Denture Base ◽  
Significant Difference ◽  
Base Resin ◽  
Bond Strengths ◽  
Group 2 ◽  
Denture Base Resin

ABSTRACT Aim This study is to evaluate the role of 1:1 v/v 30% trichloromethane and monomer solvent in enhancing the durability of bonding between cross-linked acrylic teeth and different heatcured denture bases with or without mechanical preparations made on ridge lap portion of the artificial teeth. Materials and methods Two high impact denture base resin materials (Trevalon HI, DeTrey, UK, and DPI Tuff, Mumbai) and one nonhigh impact denture base resin material (DPI Quick Set, Mumbai) were selected to form three groups. Each group contains 30 specimens prepared by five different methods. A mixture of 30% trichloromethane and monomer, mixed in the ratio of 1:1 and applied for 1 minute on the ridge lap area of experimental specimens of methods—B, C, D and E (Specimens of method—A being control group, where no alterations were made at the ridge lap portion of acrylic teeth) before curing. Hounsfield universal testing machine is employed to evaluate the comparative bond strengths. Results No significant difference was seen in bond strengths between specimens of experimental methods in all groups. When each group was assessed separately method B specimens in group 1 (739.2 N), group 2 (758 N) and method D specimens in group 3 (729 N) showed highest mean bond strengths. Control group specimens showed the least bond strength (400-460 N) in all groups with more adhesive failures. Conclusion Ridge lap portion of the specimens treated with chemical solvent as in method B showed increased bond strength in groups 1 and 2. Hence, this is a preferred method. Clinical significance Evaluation of effect of different chemical and mechanical preparations at the ridge lap areas of acrylic teeth before acrylization helps the clinician and technician to overcome the problem of debonding of teeth from denture bases and in turn provides better quality prosthesis to the patient. How to cite this article Bharat JSV, Naidu DL, Reddy MV, Naveen P, Rao NV. Effect of Trichloromethane on the Bond Strengths between Acrylic Teeth and Different Heat-cured Denture Bases: A Comparative Study. J Contemp Dent Pract 2012;13(6):850-855.

Success Rate of Obturation of Root Canals by Different Techniques in Primary Molars: A Comparative Clinical Study

2020 ◽  
Vol 2 (1) ◽  
pp. 36-44
Author(s):  
Satyawan G. Damle ◽  
Ritika Bansal ◽  
Dhanashree D. Sakhare
Keyword(s):  
Success Rate ◽  
Study Groups ◽  
Primary Molars ◽  
Control Group ◽  
Second Primary ◽  
Chi Square ◽  
Exact Test ◽  
Root Canals ◽  
Significant Difference ◽  
Comparative Clinical Study

Objective: To compare the success rate of different obturation procedures in primary mandibular second molars clinically and also by digital radiovisiography. Methods: A total of 40 children aged between 4-8 years with deeply carious mandibular second primary molars indicated for single session pulpectomy were selected. Canals were obturated with Metapex. The 3 study groups (Endodontic plugger, Handheld lentulospiral, Navi Tip syringe) were compared with the control group (reamer) both clinically and radiovisiographically. The data collected were statistically analyzed using Pearson’s Chi-square and Fisher’s exact test. Results: The use of Navi tip syringe led to the least number of voids followed by Endodontic plugger and Reamer and the highest number of voids was reported with Lentulospiral. Navitip presented maximum number of optimally filled cases followed by Endodontic plugger and Lentulospiral and least number of optimally filled cases with reamer. However, there was no statistically significant difference (p>0.05) in any of the groups with clinical (pain and tenderness to percussion) and radiographic parameters (presence or absence of voids and length of obturation). Conclusion: Within the limitations of the present study, though the clinical outcome was statistically insignificant, Navitip syringe exhibited encouraging results and is a promising option for obturation in primary teeth.

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