scholarly journals Influence of different dentin drying methods on adhesive behavior of composite restorations

2017 ◽  
Vol 4 (3) ◽  
pp. 73
Author(s):  
Helena Reis De Souza ◽  
Stéfanie Thieme Perotto ◽  
Maria Carolina Guilherme Erhardt ◽  
Fabio Garcia Lima ◽  
Ana Maria Spohr ◽  
...  
Keyword(s):  
Bond Strength ◽  
Adhesive System ◽  
Drying Methods ◽  
Distilled Water ◽  
Chi Square ◽  
Air Drying ◽  
Bonding Agents ◽  
Significance Level ◽  
Composite Resin Restorations

Aim: The aim of this study was to evaluate, in vitro, the influence of four different dentin drying methods (air drying for 10s, absorbent paper, endodontic suction cannula and air drying for 10s with subsequent re-wetting with distilled water), after etching with phosphoric acid gel 37%, on bond strength and microleakage of composite restorations.Material and Methods: Twenty sound bovine incisors were selected and sectioned transversely. The buccal surfaces were frayed until exposure of dentin, etched and washed with distilled water. Each specimen was subjected to one of the four different drying methods. A 3-step total-etch adhesive system (Adper Scotchbond™ Multi-Purpose) was used on 10 teeth and on the other 10, a 2-step total-etch adhesive system (Adper Single BondT™ 2) was used. Composite resin restorations in cylindrical shapes were made and, after thermocycling, the teeth were subjected to the microshear bond strength test. Cervical areas of the teeth were prepared and restored with the same techniques describe above. Cervical restorations were cut and subjected to microleakage analysis in the cervical margin. Data obtained were tabulated and statistically analyzed, using ANOVA, Chi-square and Kruskal-Wallis tests, and the significance level was set at 5%.Results: The results showed no statistically significant differences among the groups tested.Conclusions: It was concluded that all drying methods tested represent feasible alternatives to clinical application for total etch dentin-bonding agents.

scholarly journals Avaliação da Resistência de União Entre Resina Composta e Substrato Dentinário Exposto à Quitosana

2017 ◽  
Vol 19 (3) ◽  
pp. 191
Author(s):  
Sarah Cavalcante De Barros ◽  
Heloise Caroline Vieira ◽  
Maura Cristiane Gonçalves Orçati Dorilêo ◽  
Murilo Baena Lopes ◽  
Sandrine Bittencourt Berger ◽  
...  
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Adhesive System ◽  
Smear Layer ◽  
Test Machine ◽  
Distilled Water ◽  
Significance Level ◽  
Layer Removal ◽  
The Matrix

Em endodontia, indicam-se substâncias quelantes para a remoção da lama dentinária. O objetivo deste estudo foi avaliar, in vitro, por meio do microcisalhamento, a resistência de união da resina composta com superfícies dentinárias tratadas com EDTA (17%) e quitosana (0,2%). De 30 coroas de dentes bovinos foram removidas as paredes palatina, mesial e distal, expondo a superfície dentinária da parede vestibular da câmara coronária, que abrasionada produziu a camada de esfregaço. Após, a superfície foi tratada, estabelecendo-se 3 grupos (n=10): G1 (controle) com aplicação de água destilada (1min); G2 com aplicação de EDTA (3 min.), e lavagem com água destilada (1 min.); e G3 com aplicação de quitosana (3 min.), lavagem com água destilada (1 min.). Na sequência foram aplicados 2 ml de NaOCl (2,5%), 2 ml de água destilada (1 min), armazenando-as em água destilada (37 °C). Retiradas da água destilada (24 h), fixaram –se 3 tubos Tygon (1mmX1mm) na dentina após o condicionamento local com sistema adesivo convencional de 2 passos. Preenchidos com resina composta e após fotoativação, os tubos foram removidos obtendo-se cilindros que foram submetidos ao microcisalhamento em máquina de ensaio universal. Os resultados de resistência de união (MPa) foram submetidos a Análise de Variância e Tukey, com nível de significância 5%. Observou-se que a resistência de união de G2 e G3 foram equivalentes estatisticamente (p>0,05), porém significativamente maiores que em G1 (p<0,05). Conclui-se que quitosana e EDTA promovem resistência de união semelhante nas condições testadas.Palavras-chave: Camada de Esfregaço. Dentina. Endodontia.AbstractIn endodontics, chelating substances are indicated for smear layer removal. This study evaluated, by micro-shear, the bond strength between composite resin and dentin surfaces treated with EDTA (17%) and chitosan (0.2%). The palatal, mesial and distal walls were removed from 30 crowns of bovine teeth, to expose buccal dentin of coronary chamber, whose abrasion produced the smear layer. The surface was treated, considering 3 groups (n = 10): G1 (control) distilled water (1min); G2 EDTA application (3 min), and distilled water (1 min); and G3 chitosan application (3 min.), distilled water (1 min.). All groups received 2 ml of NaOCl (2.5%), 2 ml of distilled water (1 min), and then stored in distilled water (37 °C). After that (24 h), 3 Tygon matrix (1 mmX1 mm) were fixed to the dentin after surface storing them with a two-step adhesive system. Then, the matrixes were filled with composite resin, and once photoactivated, the matrix were removed resulting in cylinders that were submitted to micro-shear bond test in universal test machine. The results (MPa) were submitted to ANOVA and Tukey, with significance level of 5%. It was observed that G2 and G3 bond strength were statistically equivalent (p> 0.05), but significantly higher than G1 (p <0.05). It is concluded that chitosan and EDTA resulted in similar bond strength under the conditions tested.Keywords: Smear Layer. Dentin. Endodontics.

scholarly journals The relationship between the storage methods and the formation of dentinal defects (cracks)

2019 ◽  
Vol 67 ◽  
Author(s):  
Fábio Nakao ARASHIRO ◽  
Michelle Tavares Galotto NANTES ◽  
Pedro Gregol da SILVA ◽  
Key Fabiano Souza PEREIRA ◽  
Muryllo Eduardo Sales dos SANTOS
Keyword(s):  
Storage Period ◽  
Root Apex ◽  
Surgical Instruments ◽  
Distilled Water ◽  
Chi Square ◽  
Significance Level ◽  
Significant Difference ◽  
And Storage ◽  
Group 1

ABSTRACT Objective: This research study aims at conducting an in vitro evaluation of crack formation in freshly extracted teeth after undergoing different storage and decontamination methods. Methods: 60 erupted upper third molars conventionally extracted using forceps # 210h (quinelato surgical instruments, rio claro - sp) and randomly distributed in three groups (n = 30): group 1 - storage in dry environment for 30 days, group 2 - sterilization in autoclave and storage for 30 days in distilled water, and group 3 - 10% formaldehyde decontamination for 14 days and storage in distilled water for additional 30 days. after the storage period, teeth had their roots transversely sectioned at 2, 4 and 6 mm below the root apex using a low rotation diamond disk under constant cooling. the evaluation of fragments was performed using a 30-time magnification microscope. Results: Cracks were seen only in group 1 and the chi-square statistical test with 5% significance level showed a statistically significant difference comparing the dry storage group to the others. Conclusion: The storage of extracted teeth in a dry environment influences the formation of dentinal defects.

scholarly journals Effect of Two Microshear Test Devices on Bond Strength and Fracture Pattern in Primary Teeth

2013 ◽  
Vol 24 (6) ◽  
pp. 605-609 ◽  
Author(s):  
Tamara Kerber Tedesco ◽  
Eugenio Jose Garcia ◽  
Fabio Zovico Maxnuck Soares ◽  
Rachel de Oliveira Rocha ◽  
Rosa Helena Miranda Grande
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Failure Modes ◽  
In Vitro Study ◽  
Adhesive System ◽  
Fracture Pattern ◽  
Chi Square ◽  
Etch And Rinse ◽  
Chi Square Test

This in vitro study evaluated the influence of two devices for application of shear load in microshear tests on bond strength and fracture pattern of primary enamel and dentin. Eighty primary molars were selected and flat enamel (40 teeth sectioned mesio-distally) and dentin (40 teeth sectioned transversally) surfaces were obtained. Both surfaces were polished to standardize the smear layer. Two-step etch-and-rinse adhesive systems (Adper Single Bond and XP Bond) were used. Polyethylene tubes was placed over the bonded surfaces and filled with composite resin. The microshear testing was performed after storage in water (24 h/37 °C) using two devices for application of microshear loads: a notched rod (Bisco Shear Bond Tester) or a knife edge (Kratos Industrial Equipment). Failure modes were evaluated using a stereomicroscope. Bond strength data were subjected to ANOVA and chi-square test to compare the failure mode distributions (α=0.05). No significant differences were observed between the groups for dentin and enamel bond strength or fracture patterns (p>0.05). The predominant failure mode was adhesive/mixed. In conclusion, the devices for application of shear loads did not influence the bond strength values, regardless of adhesive system and substrate.

scholarly journals Effect of different concentrations of green tea extract solutions on bonding durability of etch-and-rinse adhesive system to caries affected dentin

2021 ◽  
Vol 20 ◽  
pp. e210328
Author(s):  
Ricky Rolim de Moura ◽  
Fabiana Mantovani Gomes França ◽  
Cecilia Pedroso Turssi ◽  
Roberta Tarkany Basting ◽  
Flavia Lucisano Botelho do Amaral
Keyword(s):  
Bond Strength ◽  
Green Tea ◽  
In Vitro Study ◽  
Adhesive System ◽  
Green Tea Extract ◽  
Etch And Rinse ◽  
Bonding Durability ◽  
Composite Resin Restorations ◽  
Tea Extract

Aim: The in vitro study evaluated the effect of different concentrations of green tea extract solution (GT) on the bonding durability of etch-and-rinse adhesive system to caries dentin affected (CAD). Methods: Dentinal surfaces of human third molars were polished and submitted to a microbiological caries induction protocol for 14 days. After removal of the infected dentin layer, the samples were randomly divided into 4 groups (n= 10), according to the concentration of GT solution applied in CAD, after acid etching: 0.05%; 0.2%; 2% and NT (no treatment – control). After application of a etch-and-rinse adhesive system (Adper Single Bond 2, 3M ESPE), composite resin restorations were performed on the dentin. After 24 hours, the resin-dentin blocks were sectioned 1mm2 specimens, which were subjected to the microtensile test immediately or after 6 months of storage in water. Data were submitted to two-way ANOVA for randomized blocks and Tukey test (α= 5%). Results: There was no effect of double interaction (p= 0.934). The application of 0.2% GT promoted a statistically significant increase in dentin bond strength values in comparison to the condition where GT was not used (p=0.012). There was a significant decrease of bond strength after 6 months of storage, regardless of dentin pretreatment (p = 0.007). The G test identified that there was no statistical difference regarding failure mode (p= 0.326). Conclusion: The concentration of 0.2% improved the bond strength of an etch-and-rinse adhesive system to caries affected dentin, however, none of dentin pretreatments could prevent the decrease in bond strength over time.

scholarly journals Effect of ageing media on shear bond strength of metal orthodontic brackets bonded with different adhesive systems (A comparative in-vitro study)

2020 ◽  
Vol 32 (4) ◽  
pp. 5-11
Author(s):  
Ahmed D Hatf ◽  
Mustafa M AL-Khatieeb
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Water Storage ◽  
In Vitro Study ◽  
Adhesive System ◽  
Adhesive Systems ◽  
Chi Square ◽  
Acid Challenge

Background: The aim of this study was to evaluate the shear bond strength (SBS) and adhesive remnant index (ARI) of different orthodontic adhesive systems after exposure to aging media (water storage and acid challenge). Materials and methods: Eighty human upper premolar teeth were extracted for orthodontic purposes and randomly divided into two groups (40 teeth each): the first group in which the bonded teeth were stored in distilled water for 30 days at 37°C, and the second group in which the bonded teeth were subjected to acid challenge. Each group was further subdivided into four subgroups (10 teeth each) according to the type of adhesive system that would be bonded to metal brackets: either non-fluoride releasing adhesive (NFRA), fluoride releasing adhesive (FRA), Fluoride releasing bond with self-etching primer (FRBSP), or powder and liquid orthodontic fluoride releasing adhesive (PLFRA). After 30 days of water storage and acid challenge ageing procedures, the SBS was determined using Instron testing machine with a crosshead speed of 1 mm/min. The ARI was assessed using a stereomicroscope with 10 X magnification. Result: The SBS testing revealed significant differences (p< 0.05) among the four tested adhesive systems in water storage and acid challenge groups using ANOVA F-test. In both groups, the NFRA subgroup exhibited the highest mean SBS value, followed by FRASP, then FRA subgroups, while the PLFRA subgroup had the lowest value of mean SBS. The independent t-test showed non-significant differences in mean SBS values between water storage and acid challenge groups. In respect to the ARI analysis, the Chi-square test showed significant differences among the tested adhesive systems. Conclusion: The shear bond strength of the fluoride releasing adhesive system was less than that of the non-fluoride releasing adhesive system, but still above the clinically acceptable range.

scholarly journals Assessment of shear bond strength of brackets bonded by direct and indirect techniques: an in vitro study

2012 ◽  
Vol 17 (4) ◽  
pp. 1-7 ◽  
Author(s):  
Roberto Hideo Shimizu ◽  
Karlos Giovani Grando ◽  
Isabela Almeida Shimizu ◽  
Augusto Ricardo Andriguetto ◽  
Ana Cláudia Moreira Melo ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Adhesive System ◽  
Vitro Study ◽  
Group Iii ◽  
Indirect Bonding ◽  
Group I ◽  
Group Ii

OBJECTIVE: This in vitro study was designed to evaluate the shear bond strength (SBS) of orthodontic metal brackets bonded by direct and indirect techniques. METHODS: Thirty healthy human maxillary premolar teeth were used. The teeth were divided into three groups of 10 teeth each: Group I - indirect bonding with SondhiTM Rapid-Set system (3M/Unitek), Group II - indirect bonding with TransbondTM XT adhesive system (3M/Unitek) and Group III - direct bonding with TransbondTM XT adhesive system (3M/Unitek). After bonding and obtaining the specimens for the study, the specimens were subjected to SBS testing in a universal testing machine (Emic, model DL-500). The Kolmogorov-Smirnov test was applied to ascertain that the data had a normal distribution and the Bartlett test to check whether there was homogeneity of variance. One-factor analysis of variance was performed and, subsequently, Tukey's test for paired means. A 5% significance level was adopted. RESULTS: The results of Group I were 67.6 (N) and 5.9 (MPa); Group II, 68.9 (N) and 6.1 (MPa) and Group III (control), 92.5 (N) and 8.1 (MPa). CONCLUSION: It can therefore be concluded that the means for Group III were significantly higher compared with Groups I and II in both Newton (N) and Megapascal (MPa) values. The means attained by the indirect bonding technique used in Groups I and II, however, exhibited no statistically significant differences.

scholarly journals COMPARATIVE EVALUATION OF THE SHEAR BOND STRENGTH OF THREE SELF-ETCH DENTIN BONDING AGENTS TO DENTIN: AN IN-VITRO STUDY

2020 ◽  
Vol 8 (10) ◽  
pp. 454-459
Author(s):  
Bhalla V. ◽  
◽  
K. Goud M. ◽  
Chockattu S. ◽  
Khera A ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Group Analysis ◽  
In Vitro Study ◽  
Bonding Agents ◽  
Mandibular Molar ◽  
Self Etch

Background:Dentin bonding is an ever-evolving field in adhesive dentistry. With the introduction of newer systems into the market, there is a crucial need to test their efficiency in terms of bond strength. Dual-cured adhesives in theory may provide for a better degree of conversion as compared to conventional light-cured adhesives .Thus, the aim of this study was to compare the shear bond strength of three different self-etch adhesives namely ClearfilSE bond (Kuraray), Tetric N Bond Universal (IvoclarVivadent) and Futura Bond DC (Voco) to dentin. Materials & Methods: Ninety extracted non-carious, intact human mandibular molar teeth were selected for this study. Each tooth was decoronated using a double-sided diamond disc with water coolant to a depth of 2mm from the cusp tip .The cut dentin surface was then abraded against 600-grit wet silicon carbide papers for 60 seconds to produce a uniform smear layer. The root portion of each tooth was mounted on a plastic ring using cold cure acrylic resin. Specimens were then divided into three adhesive groups of 30 teeth each, Group A: ClearfilSE Bond (Kuraray), Group B: Tetric N Bond Universal (IvoclarVivadent), Group C :Futura Bond DC (Voco). All bonding agents were used according to the manufacturers’ instructions, in combination with the resin composite Tetric N Ceram (IvoclarVivadent). The samples were thermocycled, followed by shear bond strength testing using a Universal testing machine (Hounsfield). Data were subjected to statistical analysis using one-way analysis of variance (ANOVA) (P<0.05) and Post hoc Tukey’s test for inter- and intra- group analysis respectively. Results: Clearfil SE Bond yielded the highest shear bond strength values (30.9 ±4.66 MPa) which were statistically significant, followed byTetric N Bond Universal group (29.8 ±4.34) and the lowest shear bond strength values were recorded for Futura Bond DC (18.2 ±3.13). Conclusion: Clearfil SE bond and Tetric N bond Universal can be considered as better options than Futura Bond DC.

scholarly journals Effect of Chlorhexidine and Ethanol Application on Longterm Push-out Bond Strength of Fiber Posts to Dentin

2015 ◽  
Vol 16 (7) ◽  
pp. 547-553 ◽  
Author(s):  
Roberta Tarkany Basting ◽  
Cecília Pedroso Turssi ◽  
Flavia Lucisano Botelho do Amaral ◽  
Fabiana Mantovani Gomes França ◽  
Rafaela Crystyan Vaneli ◽  
...  
Keyword(s):  
Bond Strength ◽  
Repeated Measures ◽  
Adhesive System ◽  
Resin Cement ◽  
Control Group ◽  
Test Analysis ◽  
Significance Level ◽  
Fiber Posts ◽  
Etch And Rinse ◽  
Push Out

ABSTRACT Aim The aim of this study was to evaluate the effect of chlorhexidine and ethanol application on the push-out bond strength and bond durability of fiber posts cemented with an etch-and-rinse adhesive system/resin cement to intraradicular dentin. Materials and methods Fifty-four bovine roots were shaped for the cementation of a fiberglass post and received the application of 37% phosphoric acid. They were then randomly divided into three groups, according to the type of dentin treatment (n = 18) performed: no treatment (control group), 100% ethanol, or 2% chlorhexidine. Next, the adhesive system (Adper Scotch Bond Multipurpose Plus, 3M ESPE) was applied to the dentin, according to the manufacturer's instructions. Glass fiber posts were cemented with dual resin cement (Rely X ARC, 3M ESPE). After 48 hours, the specimens were serially sectioned for push-out test analysis, providing two slices from each root third (cervical, medium and apical), one of which was tested immediately and the other stored in distilled water for 180 days. The data were analyzed with three-way analysis of variance (ANOVA) for repeated measures and Tukey's test at a 5% significance level. Results Intraradicular treatment with chlorhexidine yielded the highest bond strength means, followed by ethanol treatment. The control group presented the lowest bond strength means. Water storage exerted no effect on bond strength values. Conclusion Both chlorhexidine and ethanol improved push-out bond strength to intraradicular dentin, with the former providing the best results, regardless of the storage time. Clinical significance The application of 2% chlorhexidine or 100% ethanol may be an important step that can be taken to enhance bond strength of fiber posts to intraradicular dentin, when dual resin cements are used. How to cite this article França FMG, Vaneli RC, de Melo Conti C, Basting RT, do Amaral FLB, Turssi CP. Effect of Chlorhexidine and Ethanol Application on Long-term Pushout Bond Strength of Fiber Posts to Dentin. J Contemp Dent Pract 2015;16(7):547-553.

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