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Search Results: 1 - 10 of 7229 matches for " shear bond strength "
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Comparison of Two Methods of Chlorhexidine Application of Shear Bond Strength Degradation between Composite Resin and Dentin  [PDF]
Endang Suprastiwi, Itja Risanti, Nila Kesuma Djauharie
Open Journal of Stomatology (OJST) , 2015, DOI: 10.4236/ojst.2015.58026
Abstract: Background: Chlorhexidine could have effect on shear bond strength of composite resin-dentin. Objective: The purpose of this study is to compare two methods of chlorhexidine application of shear bond strength degradation between composite resin and dentin. Methods: Thirty samples of dentin were taken from the crown of premolars and then divided into three groups (n = 10). Group 1 were applied bonding without chlorhexidine, group 2 were applied with liquid chlorhexidine and followed by bonding, group 3 were applied bonding which contains chlorhexidine. Each group was divided into two sub-groups (n = 5): the group with and without 10% NaOCl immersion for one hour. Then, 4 samples in each sub-group were used to measure shear bond strength using Universal Testing Machine, and 1 sample was examined with Scanning Electron Microscope (SEM). Data were analyzed using SPSS 17 by Mann-Whitney and Kruskal Wallis test. Results: The highest mean shear bond strength without 10% NaOCl immersion was in group 1, while the highest mean with 10% NaOCl immersion was in group 3. Significant differences occurred between the groups 1 and 2, groups 2 and 3. Conclusion: Method of using bonding contains chlorhexidine can increase and inhibit degradation shear bond strength between composite resin and dentin.
Problems in Standardization of Orthodontic Shear Bond Strength Tests; A Brief Review
M.S. A. Akhoundi,F. Mojtahedzadeh
Journal of Dentistry of Tehran University of Medical Sciences , 2005,
Abstract: Bonding brackets to the enamel surface has gained much popularity today. New adhesive systems have been introduced and marketed and a considerable increase in research regarding bond strength has been published. A considerable amount of these studies deal with shear bond strength of adhesives designed for orthodontic purpose.Previous studies have used variety of test designs. This diversity in test design is due to the fact that there is no standard method for evaluating shear bond strength in orthodontics. Therefore comparison of data obtained from different study is almost impossible.This article tries to briefly discuss the developments occurred in the process of shear bond strength measurement of orthodontic adhesives with an emphasis on the type of test set up and load application.Although the test designs for measuring shear bond strength in orthodontics are still far from ideal, attempts must be made to standardize these tests especially in order to makecomparison of different data easier. It is recommended that test designs be set up in such a manner that better matches with the purpose of the study.
Isotropic shear bond strength behavior of superficial bovine dentin: A pilot study  [PDF]
Camila Sabatini, Sebastiano Andreana
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.31001
Abstract:

The aim of this pilot study was to evaluate the shear bond strength of superficial bovine incisor dentin in different crown regions. Bonding was performed to the incisal, middle and cervical thirds of superficial bovine coronal dentin (n = 20) with a two-step etch-and-rinse adhesive (Optibond Solo Plus) and resin composite (Z100). Shear bond strength was evaluated at 24 h and failure modes of representative specimens wereobserved with FE-SEM. Non-parametric Kruskal-Wallis test with a significance level of 0.05 was used for data analysis. Mean shear bond strength values for the incisal, middle, and cervical thirds were 36.9 (3.1), 42.6 (2.6), and 37.1 (2.1) respectively with no significant differences evidenced between the crown thirds (p = 0.19). Observation of the failure mode of representative specimens demonstrated that specimens with high bond strength values exhibited predominantly mixed-type failures whereas low strength specimens exhibited adhesive failures between the dentin and adhesive. The absence of significant differences in shear bond strength between crown thirds indicate that, regardless of tubule orientation, any crown region can be used when superficial bovine incisor dentin is used for shear bond strength testing.

An in Vitro Comparison of Bonding Effectiveness of Different Adhesive Strategies on Erbium:Yttrium-Alluminum-Garnet Laser Irradiated Dentin  [PDF]
Daniele Scaminaci Russo, Jacopo Buti, Luca Giachetti
Open Journal of Stomatology (OJST) , 2016, DOI: 10.4236/ojst.2016.61001
Abstract: Background: To date there is not a material considered ideal for the lased dentin. Objective: To compare the bond strength to human lased dentin of self-etch and etch-and-rinse adhesive systems, a self-adhesive resin composite and a glass-ionomer cement. Methods: Forty human molars were sectioned to obtain a 2 mm-thick slab of mid-coronal dentin. The occlusal surface of each slab was polished by SiC paper (P600) for 10 s. Then an half part of dentin slabs was randomly selected for receiving treatment with 2.94 μm Er:YAG laser (DEKA, Smart 2940D Plus) with 10 Hz at 100 mJ, pulse duration of 230 μs with contact tip. Dentin slabs were randomly divided into four groups (n = 10). Six conical frustum-shaped build-ups were constructed on the occlusal surface of each dentin slab using bonding agents (OptiBond Solo Plus Group 1; OptiBond All-in-one Group 2) combined with a resin composite (Premise Flow), self-adhesive resin composites (Vertise Flow Group 3) and a glass-ionomer cement (Ketac-Fil Group 4). Specimens were subjected to μSBS test. Data were analyzed by a mixed model and Tukey’s test. Results: Measured bond strengths were (mean ± standard deviation): 20.8 ± 5.5 MPa (laser treatment) and 15.6 ± 4.5 MPa (SiC paper) for Group 1, 18.9 ± 5.3 MPa (laser treatment) and 14.0 ± 4.3 MPa (SiC paper) for Group 2, 7.9 ± 2.8 MPa (laser treatment) and 4.3 ± 2.2 MPa (SiC paper) for Group 3, 4.7 ± 1.9 MPa (laser treatment) and 2.6 ± 1.2 MPa (SiC paper) for Group 4. The inferential analysis showed that the dentin laser treatment significantly affected the bond strength within each individual group. On dentin treated with laser the bond strengths recorded for build-ups constructed with etch and rinse and self-etch adhesive systems were significantly higher than those recorded for build-ups constructed with self-adhesive resin composite and glass-ionomer cement (p < 0.0001). Similarly, on dentin treated with SiC paper the bond strengths recorded for build-ups constructed with etch and rinse and self-etch adhesive systems were significantly higher than those recorded for build-ups constructed with self-adhesive resin composite and glass-ionomer cement (p < 0.0001). Conclusion: Er:YAG laser treatment has increased the shear bond strength of all the adhesive materials used.
Bond Strength of Orthodontic Bracket Cement Using a Bleaching Light for Curing  [PDF]
Yoav Shapinko, Iro Eleftheriadi, Nir Shpack, Moshe Davidovitch, Elias Bitsanis, Shlomo Matalon, Tamar Brosh
Open Journal of Stomatology (OJST) , 2018, DOI: 10.4236/ojst.2018.83007
Abstract: Aim: To investigate the bond strengths achieved by using a Bleaching Curing Light (BCL) to polymerize orthodontic bonding cement. Material and Methods: 160 anterior bovine teeth were used to form 20 average sized human dental arches, and distributed into 2 groups according to which light curing method used: Group 1: BCL for 40 seconds, or Group 2: LED for 10 seconds. After storage in a controlled environment, Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) were determined. Results: Group 1 showed significantly lower SBS in the most posterior (first molar) position of the dental arch, (Group 1: 0.7 ± 1.0 MPa, Group 2: 2.9 ± 1.7 MPa, p < 0.01), but significantly higher SBS in the most anterior position (Group 1: 5.1 ± 1.8 MPa, Group 2: 3.8 ± 1.2 MPa, p < 0.02). A high correlation was found between the position of the bracket and debonding values (p < 0.02). Bonding failures in the most posterior arch positions occurred more frequently within Group 1, and lower ARI than Group 2 over corresponding arch locations. Conclusion: Simultaneous full-arch curing of orthodontic bracket cement using a BCL is clinically acceptable in all but the most posterior locations along the dental arch.
Evaluation of an Orthodontic Adhesive with Combined Primer and Composite  [PDF]
Yoav Shapinko, Iro Eleftheriadi, Tamar Brosh, Lihi Adler-Abramovich, Moshe Davidovitch, Tatiana Sella-Tunis, Rachel Sarig, Nir Shpack
Open Journal of Stomatology (OJST) , 2018, DOI: 10.4236/ojst.2018.86020
Abstract: Objectives: To investigate the efficacy of a new orthodontic bonding system that incorporates the primer solution in the adhesive. Materials and Methods: 90 anterior bovine teeth were divided in three groups: in Group I, brackets were bonded with Transbond XT system, in Group II with GC Ortho Connect which incorporates the primer in the adhesive, and in Group III, a single layer of primer was applied on the teeth before bonding the brackets with GC Ortho Connect. After a 24-hour latency period, Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) were measured. In cases with remnants left mainly on the bracket base, energy dispersive X-ray (EDX) spectrometry was performed in order to determine the presence of calcium particles. Selected cases were examined with Scanning Electron Microscopy (SEM) analysis and in nanometer scale with a confocal visible light microscope (μsurf revolver, NanoFocus AG, Germany). Results: The mean SBS values were 7.25 ± 0.58 MPa for Group I, 6.57 ± 0.50 MPa for Group II and 7.33 ± 0.56 MPa for Group III. These differences were not statistically significant (p = 0.562). ARI evaluation showed that the debonding failure happened more frequently within the adhesive interface in Group II, whereas this occurred more often at the tooth-adhesive interface in Group III. However, statistical analysis of the ARI scores showed no significant difference in adhesive remnants among the three groups (p = 0.078). Conclusion: The GC Ortho Connect bonding system can be efficiently used for orthodontic bonding. Adding a layer of primer appears to slightly increase the SBS while causing less adhesive to remain on enamel from which brackets were debonded.
Effects of different chlorhexidine pretreatments on adhesion of metal brackets in vitro
Corinne Frey, Enver Yetkiner, Bogna Stawarczyk, Thomas Attin, Rengin Attin
Head & Face Medicine , 2012, DOI: 10.1186/1746-160x-8-36
Abstract: Ninety bovine enamel specimens were allocated to six groups (n=15). Metal brackets were bonded on all specimens after chlorhexidine pre-treatments forming the following groups: (1) untreated specimens (control); (2) 40% varnish (EC40, Biodent BV, Netherlands), remnants removed with brushing mimicking patient cleaning; (3) 40% varnish (EC40), remnants removed with brushing mimicking professional cleaning; (4) 1% varnish (Cervitec Plus, Ivoclar vivadent, Schaan, Liechtenstein), remnants not removed; (5) brushed with% 1 gel (Corsodyl, GlaxoSmithKline, Münchenbuchsee, Germany), remnants not removed; (6) immersed in 0.07% mouthrinse (Corsodyl, GlaxoSmithKline, Münchenbuchsee, Germany), remnant not rinsed. Debonding of brackets was performed using a universal testing machine. Data were analysed using one-way ANOVA and post-hoc Scheffé test.Group 4 performed significantly inferior than all the other groups and the control. Group 4 presented the highest number of adhesive failures at the enamel-resin interface whereas in other groups no failures at adhesive-resin interface was observed.Presence of chlorhexidine varnish prior to bracket bonding adversely affects adhesion. Concentration of chlorhexidine pre-treatment has no influence on shear bond strength.Standard caries prevention measures based on mechanical plaque removal, non-cariogenic dietary habits and regular fluoride supplementation are often insufficient to prevent new lesions in orthodontic patients [1]. Following the formation of a highly colonized cariogenic micro-flora, neither tooth brushing nor increased fluoride delivery is capable of effectively preventing the demineralization process [1,2]. Thus, the use of an antimicrobial agent to suppress cariogenic bacteria, and thereby to inhibit the development of new caries lesions, seems to be a rational approach during orthodontic treatment [3,4].Chlorhexidine (CHX) is the most potent documented antimicrobial against Mutans streptococci (MS), one of the most prono
Estudo comparativo in vitro da resistência ao cisalhamento da colagem e do índice de remanescente adesivo entre os compósitos Concise e Fill Magic
Pithon, Matheus Melo;Santos, Rogério Lacerda dos;Oliveira, Márlio Vinícius de;Ruellas, Ant?nio Carlos de Oliveira;
Revista Dental Press de Ortodontia e Ortopedia Facial , 2006, DOI: 10.1590/S1415-54192006000400009
Abstract: aim: to compare the shear bond strength and adhesive remnant index (ira) between the composites concise and fill magic orthodontic. methods: the sample consisted of 24 cattle permanent low incisors divided in two groups. in the first group 12 brackets were bonded with the concise composite and in the second group 12 with the fill magic orthodontic composite. the tests of the shear and the evaluation of the ari were developed with the whole sample. results and conclusion: there were not significant statistic differences between the composites in the two evaluated items.
Estudo comparativo de seis tipos de braquetes ortod?nticos quanto à for?a de ades?o
Fleischmann, Leonardo de Aquino;Sobral, Márcio Costa;Santos Júnior, Gildo Coelho;Habib, Fernando;
Revista Dental Press de Ortodontia e Ortopedia Facial , 2008, DOI: 10.1590/S1415-54192008000400013
Abstract: introduction: an accurate diagnosis as well as the correct selection of materials, brackets in particular, are important pre-requisites for success in orthodontic therapy. aim: the aim of this study was to examine the influence of various brackets-base designs on bond strength. methods: six models were evaluated by a test of sheer bond strength: discovery (dentaurum) - metallic with laser grooves and 13.12mm2 of base area; monobloc (morelli) - metallic one-piece with raised bumps and 10.22mm2 of area; edgewise standard (ortho organizers) - metallic with mim (metal injection molding) and 12.02mm2 of area; illusion plus (ortho organizers) - ceramic with retention ridges and 13.49mm2 of area; composite (morelli) - polycarbonate with raised bumps for mechanical retention with 14.68mm2 of area; and edgewise standard (morelli) - metallic with single mesh and 14.31mm2 of area. the brackets were bonded on bovine teeth with fill magic ortod?ntico (vigodent) bond agent, for testing. the study was conduced in a universal test machine (emic), and the bond strength was recorded at the moment of split by tesc software, 3.01 version; it was calculated in newtons (n) and megapascal (mpa). results and conclusions: no statistical difference among tested brackets was found, and the group with the greatest average bond strength was discovery with 10,12mpa.
Effects of silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets
Atsü, Saadet;?atalba?, Bülent;Gelg?r, Ibrahim Erhan;
Journal of Applied Oral Science , 2011, DOI: 10.1590/S1678-77572011000300010
Abstract: objective: the aim of this study was to evaluate the effects of tribochemical silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets. material and methods: twenty debonded metal and 20 debonded ceramic brackets were randomly assigned to receive one of the following surface treatments (n=10 for each group): (1) sandblasting (control); (2) tribochemical silica coating combined with silane. brackets were rebonded to the enamel surface on the labial and lingual sides of premolars with a light-polymerized resin composite. all specimens were stored in distilled water for 1 week and then thermocycled (5,000 cycles) between 5-55oc. shear bond strength values were measured using a universal testing machine. student's t-test was used to compare the data (α=0.05). failure mode was assessed using a stereomicroscope, and the treated and non-treated bracket surfaces were observed by scanning electron microscopy. results: rebonded ceramic brackets treated with silica coating followed by silanization had significantly greater bond strength values (17.7±4.4 mpa) than the sandblasting group (2.4±0.8 mpa, p<0.001). no significant difference was observed between the rebonded metal brackets treated with silica coating with silanization (15±3.9 mpa) and the sandblasted brackets (13.6±3.9 mpa). treated rebonded ceramic specimens primarily exhibited cohesive failure in resin and adhesive failure at the enamel-adhesive interface. conclusions: in comparison to sandblasting, silica coating with aluminum trioxide particles followed by silanization resulted in higher bond strengths of rebonded ceramic brackets.
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