Effect of Thermocycling, Degree of Conversion, and Cavity Configuration on the Bonding Effectiveness of All-in-One Adhesives

2015 ◽  
Vol 40 (5) ◽  
pp. 480-491 ◽  
Author(s):  
HM El-Damanhoury ◽  
M Gaintantzopoulou
Keyword(s):  
Resin Composite ◽  
Pearson Correlation ◽  
Class Ii ◽  
Degree Of Conversion ◽  
Control Group ◽  
Blue Dye ◽  
Bonding Agents ◽  
Cavity Configuration ◽  
Post Hoc ◽  
The Impact

SUMMARY The aim of this study was to compare five all-in-one bonding agents with respect to microleakage, microtensile bond strength (μTBS), degree of conversion (DC) and the impact of cavity configuration. The materials tested were Adper Easy Bond, Clearfil S3 Bond, iBond, Optibond All-in-One, Xeno IV, and Adper Single Bond Plus as a control. The DC of each adhesive was measured on the surfaces of dentin discs (n=5) by attenuated total reflectance Fourier transform infrared spectroscopy. One hundred and forty-four extracted human molars were randomly divided and assigned to one of the five tested adhesives and the control group. The μTBS to dentin was measured on flat occlusal dentin with and without thermocycling and to the gingival floor dentin of class II cavities (n=8). All specimens were restored with Filtek Z250 resin composite. Class II samples were immersed in a 5% methylene blue dye solution for 24 hours, and microleakage was examined under a stereomicroscope. Micromorphological analysis of demineralized/deproteinized specimens was done using scanning electron microscopy. The DC and microleakage data were statistically analyzed by one-way analysis of variance (ANOVA) and μTBS data by two-way ANOVA followed by a Bonferroni multiple comparison post hoc test (α=0.05) and Weibull-distribution survival analysis. The relation between different variables and μTBS and microleakage was tested by the Pearson correlation coefficient and regression statistics. A moderate direct relation between DC and μTBS durability was found for all the adhesives tested. Significant wide variations exist among the results obtained for single-bottle adhesives tested regarding their μTBS and microleakage. Some of the all-in-one materials tested have shown significantly inferior results under a high C-factor or after aging. The use of these materials should be carefully considered.

scholarly journals The Effect of Different Disinfecting Agents on Bond Strength of Resin Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmed Mohammed Hassan ◽  
Ahmed Ali Goda ◽  
Kusai Baroudi
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Control Group ◽  
Posterior Teeth ◽  
Surface Pretreatment ◽  
Dentin Surface ◽  
Post Hoc

Objective. The aim of this study was to evaluate the effect of different disinfectant agents on bond strength of two types of resin composite materials.Methods. A total of 80 sound posterior teeth were used. They were divided into four groups(n=20)according to the dentin surface pretreatment (no treatment, chlorhexidine gluconate 2%, sodium hypochlorite 4%, and EDTA 19%). Each group was divided into two subgroups according to the type of adhesive (prime and bond 2.1 and Adper easy one). Each subgroup was further divided into two subgroups according to the type of resin composite (TPH spectrum and Tetric EvoCeram). Shear bond strength between dentin and resin composite was measured using Universal Testing Machine. Data collected were statistically analyzed byt-test and one-way ANOVA followed by Tukey’spost hoctest.Results. It was found that dentin treated with EDTA recorded the highest shear bond strength values followed by sodium hypochlorite and then chlorhexidine groups while the control group showed the lowest shear bond strength.Conclusions. The surface treatment of dentin before bonding application has a great effect on shear bond strength between resin composite and dentin surface.

scholarly journals Influence of Fiber Inserts, Type of Composite, and Gingival Margin Location on the Microleakage in Class II Resin Composite Restorations

2014 ◽  
Vol 39 (1) ◽  
pp. E9-E15 ◽  
Author(s):  
V Dhingra ◽  
S Taneja ◽  
M Kumar ◽  
M Kumari
Keyword(s):  
Resin Composite ◽  
Class Ii ◽  
Blue Dye ◽  
Group Vi ◽  
Group V ◽  
Gingival Margin ◽  
Composite Restorations ◽  
Group I ◽  
Distal Side ◽  
Fiber Inserts

SUMMARY This study evaluated the influence of fiber inserts, type of composites, and location of the gingival seat on microleakage in Class II resin composite restorations. Fifty noncarious human third molars were selected for the study. Standardized Class II box type cavities were prepared on the mesial and distal side of 45 teeth. The gingival margin was placed above the cementoenamel junction (CEJ) on the mesial side and below the CEJ on the distal side. The remaining five teeth received no cavity preparations. The prepared samples were divided randomly on the basis of type of composite and presence or absence of fiber inserts, into four experimental groups of 10 teeth each and two control groups of five teeth each. The groups were defined as follows: group I (n=10) – Z350 XT; group II (n=10) – Z350 XT with fibers; group III (n=10) – P90; group IV (n=10) – P90 with fibers; and group V (n=5) – positive controls, cavities were not restored; group VI (n=5) – negative controls, no cavities were prepared. The samples were stored in distilled water in incubator at 37°C for 24 hours and then subjected to 500 cycles of thermocycling (5°C and 55°C) with a dwell time of 15 seconds. They were then placed in a 2% methylene blue dye solution for 24 hours at 37°C. Samples were sectioned longitudinally and evaluated for microleakage at the occlusal and gingival margin under a stereomicroscope at 20× magnification. Kruskal-Wallis and Mann-Whitney U-tests were used to compare the mean leakage scores. Restorations with gingival margins in enamel showed significantly less microleakage. Significant reduction in microleakage was observed in groups restored with P90 composite than those restored with Z350 XT. No improvement in microleakage was observed with the use of fiber inserts (p>0.05).

scholarly journals The Effect of IELTS Listening Strategy Use on the Reduction of IELTS Listening Test Anxiety and on IELTS Listening Performance

2017 ◽  
Vol 7 (11) ◽  
pp. 1025 ◽  
Author(s):  
Ali Reza Nemat Tabrizi ◽  
Mahnaz Ranjbar
Keyword(s):  
Test Anxiety ◽  
Pearson Correlation ◽  
Strategy Instruction ◽  
Strategy Use ◽  
Control Group ◽  
Listening Test ◽  
Significant Difference ◽  
Post Test ◽  
The Impact ◽  
Experimental Group

The study investigates the impact of IELTS listening strategy use on the reduction of listening test anxiety and on the listening performance of the IELTS test takers in light of the data of 80 participants on the pretest and post-test IELTS listening along with the participants' score on pre-anxiety and post anxiety scale. So, drawing on the instruments including a proficiency test, pre/post-test, anxiety questionnaire, materials for strategy instruction, the participants were randomly divided into two groups: Control Group and Experimental Group, each including 40 participants. As per the procedure, after tackling their pre-listening performance and pre-anxiety score, one group was treated with IELTS-Listening related strategies and the other group was not treated, but both were administered listening test. The results of the study indicated that those treated with IELTS strategy outperformed ( t (78) = 4.57, p = .000, r = .460 ) those receiving no listening-related strategy. Furthermore, the results of a t-test run on the post-test of the groups anxiety arrived at a statistically significant difference (t (78) = 5.77, p = .000, r = .547), representing that the control group outperformed the experimental group. Also, Pearson Correlation done for finding out a potential relationship between anxiety and listening performance indicated a negative and weak to moderate relationship ((r (78) = -.26, p = .020). The pedagogical implications of the study are in detailed argued.

scholarly journals Effect of Diode Laser (810 nm) Irradiation on Marginal Microleakage of Multi-mode Adhesive Resins in Class V Composite Restorations

2019 ◽  
Vol 10 (4) ◽  
pp. 275-282
Author(s):  
Niusha Golbar ◽  
Shahin Kasraei ◽  
Anahit Afrasiabi ◽  
Elahe Mostajir ◽  
Seyed Masoud Mojahedi
Keyword(s):  
Diode Laser ◽  
Resin Composite ◽  
Control Group ◽  
Blue Dye ◽  
Adhesive Systems ◽  
Universal Adhesive ◽  
Class V ◽  
Composite Restorations ◽  
Self Etch ◽  
Multi Mode

Introduction: Some studies have shown that laser irradiation on unpolymerized adhesives can improve composite-dentin adhesion. The aim of the present study was to evaluate the effect of the diode laser (810 nm) on the microleakage of multi-mode adhesive systems at enamel and dentin margins of composite restorations. Methods: Classic class V boxes were prepared on 48 sound premolar teeth and randomly divided into 6 groups (n=16). In the control groups, Scotchbond Universal (SBC), G-Premio (GBC), and Ambar U (AMC) were used by a self-etch mode. In the test groups (SBL, GBL, ABL), the 810 nm diode laser was irradiated (1 W) for 10 seconds before the polymerization of the adhesive. The boxes were restored by the resin composite. After finishing and polishing, the samples were thermocycled (5°C to 55°C) for 1000 cycles and then immersed in 0.1% methylene blue dye (48 hours). Dye penetration through the gingival and occlusal margins was measured by Stereomicroscope. The data were analyzed at the 5% significance level using Kruskal-Wallis and Mann-Whitney U tests. Results: Significant differences were found between the control and test groups (P<0.05). The occlusal margins of the SBL and GBL groups and the cervical margin of the SBL group exhibited the lowest microleakage (P<0.05). The AM control group showed maximum microleakage at cervical and occlusal margins. Conclusion: The irradiation of the 810 nm diode laser on the unpolymerized universal adhesive systems in a self-etch mode caused a significant reduction in enamel and dentin marginal microleakage of composite restorations.

scholarly journals Effect of Lidocaine- and Prilocaine-Based Topical Anesthetics on the Inflammatory Exudates in Subcutaneous Tissue of Rats

2012 ◽  
Vol 59 (2) ◽  
pp. 57-61 ◽  
Author(s):  
Márcia Thaís Pochapski ◽  
José Laufer Neto ◽  
Jocélia Lago Jassen ◽  
Paulo Vitor Farago ◽  
Fábio André Santos
Keyword(s):  
Vascular Permeability ◽  
Subcutaneous Tissue ◽  
Pearson Correlation ◽  
Vehicle Group ◽  
Control Group ◽  
Topical Anesthetics ◽  
Anesthetic Agents ◽  
Significant Difference ◽  
Group 2 ◽  
Post Hoc

The aim of this present study was to evaluate the irritative potential of 2 topical anesthetics used in intrapocket anesthesia for periodontal scaling/root planing when applied in subcutaneous tissue of rats. Sixty animals were divided into 4 groups: group 1, saline solution (control); group 2, poloxamer gel (thermosetting vehicle); group 3, lidocaine and prilocaine poloxamer thermosetting gel; group 4: EMLA, a lidocaine and prilocaine dermatological cream. Injections of 2% Evans blue were administrated intravenously into the lateral caudal vein. In order to analyze vascular permeability, the tested substances were injected intradermally. The rats were sacrificed 3, 6, and 9 hours after injection of the substances. The dorsal skin was dissected and removed. The vascular permeability was evaluated by the measurement of area of dye extravasation and the dye was subsequently extracted after immersion in formamide. Statistical analyses were made by ANOVA with Bonferroni's post hoc test and Pearson correlation. The 2 methods to analyze the exudative phase of the inflammatory process showed statistically significant difference among the groups and periods of evaluation (P &lt; .05). Both methods had a significant correlation (P &lt; .0001). Under the tested conditions, the anesthetic agents showed mild initial inflammatory response when implanted in subcutaneous connective tissue.

scholarly journals Effects of Contamination by Hemostatic Agents and Use of Cleaning Agent on Etch-and-Rinse Dentin Bond Strength

2016 ◽  
Vol 27 (6) ◽  
pp. 688-692 ◽  
Author(s):  
César Rogério Pucci ◽  
Rodrigo Maximo de Araújo ◽  
Ana Julia Farias de Lacerda ◽  
Mirella Anjos de Souza ◽  
Maria Filomena Rocha Lima Huhtala ◽  
...  
Keyword(s):  
Bond Strength ◽  
Resin Composite ◽  
Control Group ◽  
Hemostatic Agents ◽  
Diamond Bur ◽  
Mechanical Cycling ◽  
Etch And Rinse ◽  
Post Hoc ◽  
Push Out ◽  
Cleaning Protocol

Abstract The aim of this study was to evaluate the influence of contamination by hemostatic agents and rinsing with chlorhexidine on bond strength between dentin and resin composite. Ninety-six bovine teeth were sectioned to expose a flat dentin surface area. A standardized cavity with 2.0 mm in thickness, superficial diameter of 4.0 mm and bottom diameter of 3.0 mm was prepared with a diamond bur in each dentin specimen. The teeth were divided into four groups according to the hemostatic employed: G1: control; G2: use of ViscoStat, Ultradent; G3: Hemosthasegel, FGM; and G4: Hemostop, Dentsply. The groups were divided into two subgroups according to the cleaning protocol method (n=12): A: without any further cleaning; and B: cleaning with chlorhexidine at 0.2%. All cavities were filled using a dentin adhesive and a resin composite, following the manufacturer's instructions. After 24 h, the specimens were aged by thermal and mechanical cycling. The bond strength was determined by the push out bond test (MPa), Statistical analysis was performed using two-way ANOVA and Tukey test (p<0.05). Statistically significant differences were detected among all groups treated with hemostatic agents and the control group. The post-hoc test showed that cleaning the cavity with chlorhexidine significantly improves the bond strength between dentin and resin composite. Our results suggested that the use of chlorhexidine can reestablish the bond strength between dentin and resin composite when a hemostatic agent was applied.

Comparison of Enamel and Dentin Shear Bond Strengths of Current Dental Bonding Adhesives From Three Bond Generations

2013 ◽  
Vol 38 (6) ◽  
pp. E237-E245 ◽  
Author(s):  
MR Meharry ◽  
SM Moazzami ◽  
Y Li
Keyword(s):  
Resin Composite ◽  
Acrylic Resin ◽  
Fourth Generation ◽  
Test Surface ◽  
Bonding Agents ◽  
Dental Bonding ◽  
Adhesive Dentistry ◽  
Sixth Generation ◽  
Post Hoc ◽  
Main Effects

SUMMARY Objective: Durability is still a major challenge in adhesive dentistry. One of the biggest areas of development has been to simplify the bonding process by using all-in-one adhesives. The aim of this study was to compare the shear bond strength (SBS) to dentin and enamel of nine dental bonding agents (DBAs) from three generations after simulated aging. Methods and Materials: For this study, 108 sound extracted human molars were randomly assigned to nine groups (n=12). The sample teeth were mounted in self-cure acrylic resin sectioned to provide paired enamel and dentin samples. All samples were polished with 240 and 600-grit silicon carbide sandpaper and randomly grouped according to the product and substrates (enamel or dentin). Herculite Ultra resin composite cylinders were bonded on each test surface, stored in 100% humidity at 37°C for 24 hours, and then thermocyled for 1,000 cycles at 5°C and 55°C. SBS testing was performed using an Ultratester at a crosshead speed of 0.5 mm/min. Statistical analysis included two-factor analysis of variance, one-sample Wilcoxon and Kruskal-Wallis tests, and the Scheffe post hoc test at an alpha level of 0.05 using SAS version 9.2. Results: Significant differences in SBS were observed between the sixth- and seventh-generation DBAs (p=0.002) but not between the sixth- and fourth-generation DBAs. Scheffe post hoc tests for the sixth-generation DBAs showed that some DBAs yielded significantly higher enamel SBS than others, but not as much as dentin SBS. As for the seventh-generation DBAs, similar post hoc tests showed significant variations in SBS between substrates (enamel and dentin) and DBAs tested. Significant main effects were also found for the different substrates for the fourth-generation (F[1,96]=10.532; p=0.003) and seventh-generation (F[1,96]=22.254; p&lt;0.001) DBAs, but not for the sixth-generation DBAs (F[1,96]=1.895, p=0.172). The SBS was higher on dentin than enamel for the fourth- and seventh-generation DBAs. Conclusion: As expected, fourth- and sixth-generation DBAs generally showed stronger SBS values than the seventh-generation all-in-one DBAs. The new sixth-generation DBA OptiBond XTR (Kerr) showed strong SBS values to both substrates and performed well in comparison to the other DBAs tested.

scholarly journals Original language subtitles: Their effects on the native and foreign viewer

Comunicar ◽  
2017 ◽  
Vol 25 (50) ◽  
pp. 23-32 ◽  
Author(s):  
Jan-Louis Kruger ◽  
Stephen Doherty ◽  
María-T. Soto-Sanfiel
Keyword(s):  
Foreign Language ◽  
Mandarin Chinese ◽  
First Language ◽  
Self Report ◽  
Control Group ◽  
Likert Scales ◽  
Original Language ◽  
Perceived Realism ◽  
Post Hoc ◽  
The Impact

This study investigates the impact of same-language subtitles on the immersion into audiovisual narratives as a function of the viewer’s language (native or foreigner). Students from two universities in Australia and one in Spain were assigned randomly to one of two experimental groups, in which they saw a drama with the original English soundtrack either with same-language English subtitles (n=81) or without subtitles (n=92). The sample included an English native control group, and Mandarin Chinese, Korean, and Spanish groups with English as a foreign language. Participants used post-hoc Likert scales to self-report their presence, transportation to the narrative world, perceived realism, identification with the characters, and enjoyment. The main results showed that subtitles did not significantly reduce these measures of immersion. However, subtitles produced higher transportation, identification with the characters, and perceived realism scores, where the first language of viewers and their viewing habits accounted for most of this variance. Moreover, presence and enjoyment were unaffected by either condition or language. Finally, the main results also revealed that transportation to the narrative world appears to be the most revealing measure of immersion in that it shows the strongest and most consistent correlations, and is a significant predictor of enjoyment. Se estudia el impacto de los subtítulos en el mismo idioma de la narrativa audiovisual según el idioma del receptor (nativo o extranjero). Estudiantes de dos universidades australianas y una española fueron asignados al azar a uno de dos grupos experimentales en los que se veía un drama con la banda sonora original en inglés con subtítulos en esa misma lengua (n=81) o sin subtítulos (n=92). La muestra incluía un grupo control de hablantes nativos de inglés, además de grupos de hablantes nativos de chino mandarín, coreano y español con inglés como lengua extranjera. Como medidas post-hoc, los participantes reportaron, mediante escalas Likert, su percepción de presencia, transporte, realismo percibido, identificación con los personajes y disfrute. Los resultados muestran que los subtítulos no reducen las medidas de inmersión. Además, que los subtítulos producen mayores puntuaciones de transporte, identificación con los personajes y percepción de realismo, cuya varianza se explica, esencialmente, por la primera lengua de los receptores y sus hábitos de visionado. Asimismo, los resultados señalan que ni a la presencia y ni al disfrute les afectan la condición experimental o el idioma del receptor. Finalmente, muestran que el transporte es la medida más reveladora de la inmersión porque produce las correlaciones más fuertes y consistentes, aparte de ser un predictor significativo del disfrute de los espectadores.

scholarly journals Class II correction in orthodontic patients utilizing the Mandibular Anterior Repositioning Appliance (MARA)

2019 ◽  
Vol 89 (3) ◽  
pp. 404-410 ◽  
Author(s):  
Anil Ardeshna ◽  
Frank Bogdan ◽  
Shuying Jiang
Keyword(s):  
Pearson Correlation ◽  
Class Ii ◽  
Maxillary Incisor ◽  
Control Group ◽  
Class Ii Malocclusion ◽  
Lateral Cephalograms ◽  
Orthodontic Patients ◽  
Mandibular Anterior Repositioning Appliance ◽  
And Control ◽  
Lower Molar

ABSTRACT Objectives: To evaluate skeletal and dentoalveolar changes produced by the Mandibular Anterior Repostioning Appliance (MARA) in the treatment of Class II malocclusion in adolescent patients. Materials and Methods: Lateral cephalograms of 24 patients, mean age 12.40 years, with a Class II malocclusion consecutively treated with MARA were compared with a historical control group. Changes were evaluated using the Pancherz superimposition and grid analysis pre- and posttreatment. Independent sample t-test, Mann-Whitney U-test, and Pearson correlation coefficient analysis were performed. Results: Significant differences were seen between the treatment and control groups during the 12 month period. Improvement in Class II relationship in the MARA group resulted from skeletal and dentoalveolar changes. There was a 7-mm molar correction and a 4.7-mm overjet reduction. There was also an increase in the mandibular base of 3.3 mm with the lower molar and incisor coming forward 2.6 mm and 2.2 mm, respectively. No significant headgear effect was shown on the maxilla. The maxillary incisor position remained unchanged, whereas the molar distalized 1.8 mm. The anterior lower facial height had an overall increase of 2.2 mm. Conclusions: The MARA was successful in achieving a Class I molar relationship and reducing the overjet in Class II malocclusions. This was the result of both skeletal and dentoalveolar changes.

Comparative evaluation of shear bond strength of composite to dentin in presence of different dental liners: An in-vitro study

2021 ◽  
Author(s):  
Ladan Ranjbar Omrani ◽  
Saba Tohidkhah ◽  
Elham Ahmadi ◽  
Mahdi Abbasi ◽  
Reza Morvaridi Farimani
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Control Group ◽  
The One ◽  
Post Hoc

Abstract Background: The aim of the current study was to evaluate and compare the influence of Dycal, Lime-lite, Theracal LC, Biodentine, Resin-modified glass ionomer cement (RMGIC), and Activa Bioactive as the pulp capping material on the shear bond strength of resin composite to dentin.Methods: A total of 70 extracted caries-free molars were randomly assigned to seven groups. Six test groups were covered with various protective liners: Dycal (GD), Theracal LC (GT), lime-lite (GL), Activa Bioactive (GA), Biodentine (GB), RMGIC (GR). The control group (GC)received no liner pretreatment. Each sample was bonded to resin composite using the total-etch tetric N bond adhesive. The samples were then tested for shear bond strength using the universal testing machine at a cross-head speed of 1 mm/min until bond failure occurred. The data were analyzed using the one-way ANOVA test followed by the Tamhane post-hoc test for pairwise comparisons of the groupsResults: Independent of the type of the applied liner, all groups exhibited inferior SBS to dentine compared to the control group. GT and GR showed significantly higher shear bond strength than GB and GD, which showed the lowest shear bond strength. GL and GA also had significantly lower SBS results than GT. The mode of fracture was predominantly cohesive in GD, GB, and GT and adhesive in GA.Conclusion: This present study concludes that the bond strength of resin-composite to dentine can be affected differently using various types of liners.

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