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Karthikeyan Subramani - One of the best experts on this subject based on the ideXlab platform.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of clinical and experimental dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p<0.05). The highest mean SBS (N ± SD) was observed in football and flower Base shapes (73.83 N ± 53.46; 65.82 N ± 37.89 respectively); the lowest mean was observed with diamond and heart shapes (30.51 N ± 11.73; 33.28 N ± 16.89 respectively). When reported in Megaspascals, statistically significant difference was observed for rectangle Base shape (3.54 MPa ± 2.69) when compared to all other Base shapes. Bracket Base shape has an effect on SBS. Higher SBS (N) for rectangle, flower, and football Base shape indicates even stress distributions throughout the Bracket Base. Base shape with a pronounced converging tip over the axial plane may contribute to the reduction in SBS due to increased peak stress concentration resulting in bond failure. Key words:Shaped Brackets, Shear bond strength, Adhesive remnant index, WildSmiles®.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:BACKGROUND The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. MATERIAL AND METHODS In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. RESULTS Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p?0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
Dennis Pham - One of the best experts on this subject based on the ideXlab platform.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of clinical and experimental dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p<0.05). The highest mean SBS (N ± SD) was observed in football and flower Base shapes (73.83 N ± 53.46; 65.82 N ± 37.89 respectively); the lowest mean was observed with diamond and heart shapes (30.51 N ± 11.73; 33.28 N ± 16.89 respectively). When reported in Megaspascals, statistically significant difference was observed for rectangle Base shape (3.54 MPa ± 2.69) when compared to all other Base shapes. Bracket Base shape has an effect on SBS. Higher SBS (N) for rectangle, flower, and football Base shape indicates even stress distributions throughout the Bracket Base. Base shape with a pronounced converging tip over the axial plane may contribute to the reduction in SBS due to increased peak stress concentration resulting in bond failure. Key words:Shaped Brackets, Shear bond strength, Adhesive remnant index, WildSmiles®.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:BACKGROUND The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. MATERIAL AND METHODS In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. RESULTS Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p?0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
Prashanti Bollu - One of the best experts on this subject based on the ideXlab platform.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of clinical and experimental dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p<0.05). The highest mean SBS (N ± SD) was observed in football and flower Base shapes (73.83 N ± 53.46; 65.82 N ± 37.89 respectively); the lowest mean was observed with diamond and heart shapes (30.51 N ± 11.73; 33.28 N ± 16.89 respectively). When reported in Megaspascals, statistically significant difference was observed for rectangle Base shape (3.54 MPa ± 2.69) when compared to all other Base shapes. Bracket Base shape has an effect on SBS. Higher SBS (N) for rectangle, flower, and football Base shape indicates even stress distributions throughout the Bracket Base. Base shape with a pronounced converging tip over the axial plane may contribute to the reduction in SBS due to increased peak stress concentration resulting in bond failure. Key words:Shaped Brackets, Shear bond strength, Adhesive remnant index, WildSmiles®.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:BACKGROUND The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. MATERIAL AND METHODS In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. RESULTS Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p?0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
Kishore Chaudhry - One of the best experts on this subject based on the ideXlab platform.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of clinical and experimental dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p<0.05). The highest mean SBS (N ± SD) was observed in football and flower Base shapes (73.83 N ± 53.46; 65.82 N ± 37.89 respectively); the lowest mean was observed with diamond and heart shapes (30.51 N ± 11.73; 33.28 N ± 16.89 respectively). When reported in Megaspascals, statistically significant difference was observed for rectangle Base shape (3.54 MPa ± 2.69) when compared to all other Base shapes. Bracket Base shape has an effect on SBS. Higher SBS (N) for rectangle, flower, and football Base shape indicates even stress distributions throughout the Bracket Base. Base shape with a pronounced converging tip over the axial plane may contribute to the reduction in SBS due to increased peak stress concentration resulting in bond failure. Key words:Shaped Brackets, Shear bond strength, Adhesive remnant index, WildSmiles®.
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study.
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:BACKGROUND The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. MATERIAL AND METHODS In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05. RESULTS Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
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Comparative evaluation of orthodontic Bracket Base shapes on shear bond strength and adhesive remnant index: An in vitro study
Journal of Clinical and Experimental Dentistry, 2017Co-Authors: Dennis Pham, Prashanti Bollu, Kishore Chaudhry, Karthikeyan SubramaniAbstract:The objective of this study was to evaluate the effect of orthodontic Bracket Base shape on shear bond strength and adhesive remnant index. In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of Brackets with different Base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p?0.05. Statistically significant difference in mean SBS in Newtons was observed for multiple Base shapes (p
Athanasios E. Athanasiou - One of the best experts on this subject based on the ideXlab platform.
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the effect of orthodontic adhesive and Bracket Base design in adhesive remnant index on enamel
Journal of the world federation of orthodontists, 2015Co-Authors: Argiro Kechagia, Spiros Zinelis, Athanasios E. Athanasiou, Nikolaos Pandis, Theodore EliadesAbstract:Abstract Background The purpose of this study was to identify the effects of Bracket-Base design and adhesive on adhesive remnant index (ARI) and enamel surface area covered by adhesive. Methods The sample consisted of 32 recently extracted premolars. The teeth were randomly assigned to one of four groups: conventional mesh Base and composite resin; laser-etched Base and composite resin; conventional mesh Base and resin-modified glass ionomer; and laser-etched Base and resin-modified glass ionomer. After a week, all Brackets were debonded. The debonded Bracket-Base surface and the buccal surface of each tooth were studied under the microscope, and the remaining adhesive was scored using the ARI. The extent of coverage of the tooth by adhesive remnants was also calculated, outlining the different areas of adhesive. Results A Fisher's exact test indicated significant differences between the groups. The adhesive resin group showed the highest ARI scores independent of the Bracket-Base design, whereas between the two Bracket-Base designs, the laser-etched Bracket design showed higher ARI. ARI scores reliably depict the extent of enamel covered by adhesive compared with the measurement of the actual area covered. Conclusion Varying the Bracket Base and adhesive may result in different ARI scores, which can affect the enamel surface during debonding.
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characterization and in vitro estrogenicity of orthodontic adhesive particulates produced by simulated debonding
Dental Materials, 2009Co-Authors: C Gioka, Theodore Eliades, Athanasios E. Athanasiou, George Eliades, Spiros Zinelis, Harris Pratsinis, D KletsasAbstract:Abstract Objective To investigate the structure and composition of ground orthodontic adhesive particulates produced under simulated clinical conditions and assess their estrogenic action in vitro . Materials and methods A chemically cured and a light-cured adhesive were included in the study. Specimens were prepared by simulating bonding procedures, covering the Bracket Base surface with cellulose films to detach the full set material. The adhesives prepared under this method were grounded in glass chambers with an 8-fluted tungsten carbide on a high-speed handpiece; a new bur and different chamber was used for each adhesive sample and grindings were performed on different days to avoid contamination of the room. The adhesive particulates produced were subjected to FT-IR spectroscopy for the molecular characterization of particles; scanning electron microscopy for the morphologic condition and structure; and X-ray microanalysis for the elemental composition of the particles. Amounts of the ground adhesives were immersed in saline for 1 month at 37 °C. Eluents from solution of the two adhesives were added to media of an estrogen-responsive cell line derived from human breast adenocarcinoma (MCF-7), to assess the estrogenicity. Positive (estradiol and bisphenol-A) and negative (saline) controls were used; all assays were repeated four times and the results were averaged. Estrogenicity data were analyzed with one-way ANOVA and the Tukey test at the .05 level of significance. Results The study of the composition of particles revealed compounds related to monomers with no major differences noted. Significant structural alterations were observed between the materials studied, with the chemically cured adhesive having larger particles. The ground samples contained Si, Na and Al apparently deriving from fillers, whereas large Ba fillers were identified only in the chemically cured group, whereas no distinct molecular variation was noted between the set material and its corresponding particulate form. Both chemically cured and light-cured adhesives exhibited an estrogenic action through induction of the proliferation rate of MCF-7 cells (160% and 128%, respectively, compared to control). Significance Apart from the potentially hazardous action of adhesive particulate aerosol produced by grinding, composite resin particulates may act as endocrinological disruptors.
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Effect of in vivo aging on the shear bond strength of an orthodontic adhesive.
Australian orthodontic journal, 2009Co-Authors: Evangelia Chatzistavrou, Theodore Eliades, Athanasios E. Athanasiou, Spiros Zinelis, George EliadesAbstract:Aims: To assess the effect of intra-oral aging on the shear bond strength of a composite resin orthodontic adhesive (Transbond XT, 3M Unitek, Monrovia, CA, USA) after 6 months in the oral cavity and to compare it with control specimens not subjected to intra-oral aging. Methods: The sample consisted of patients aged 13‐36 years, in need of premolar extractions for orthodontic purposes. Ten premolars were bonded with Transbond XT. After 6 months in vivo, the teeth were carefully extracted, sectioned at the amelo-cemental junction, mounted in cold cure acrylic resin cylinders and subjected to shear bond strength testing using a universal testing machine. The debonded Bracket Base surfaces were then studied under light microscope, photographed digitally and analysed with SigmaScan Image Measurement Software (Jandel GmbH, Erkrath, Germany) for the percentage of coverage of the debonded Brackets with the orthodontic adhesive. The same procedure was followed for 14 premolars from the same patients bonded in vitro with the same adhesive. Results: No statistically significant differences were found in the shear bond strength between the two groups of composite resin adhesive systems (with and without clinical aging) or in the adhesive remnant coverage following debonding. No significant correlation was detected between the shear bond strength and the adhesive remnant coverage in the test specimens with and without aging. Conclusions: Laboratory studies of shear bond strength appear to be clinically relevant. (Aust Orthod J 2009; 25: XXXX)
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Nickel content of as-received, retrieved, and recycled stainless steel Brackets.
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2002Co-Authors: Theodore Eliades, Spiros Zinelis, G. Eliades, Athanasios E. AthanasiouAbstract:The purpose of this study was to investigate the composition of as-received, retrieved, and recycled stainless steel Brackets. New, used, and recycled brand-matched, slot size-matched, and prescription-matched appliances were subjected to scanning electron microscopy and energy dispersive electron probe microanalysis. Elemental analysis was performed on randomly selected surface Bracket Base and wing areas, and metal content was statistically analyzed with the 2-way ANOVA and the Tukey test, with treatment (as-received, retrieved, and recycled) and Bracket regions (Base and wing) serving as discriminating variables (alpha = 0.05). The results showed that there was no difference in the surface composition of the Base; however, surface area-wing analysis indicated that nickel content was decreased in retrieved and recycled specimens, implying that an ionic release effect occurred in vivo. Differences were noted between Bracket Base and wing with respect to elemental composition for the same Brackets, implying that the Base and wings are manufactured from different alloys.