Adper SE Plus Research Articles

Shear bond strength of orthodontic brackets using orthodontic and restorative self-etching primer. An in vitro study

Background and Aim: Self-etching primers (SEPs) are used to reduce the chair side time. However, there are different SEPs that are used in orthodontics. This study is aimed to test the shear bond strength of brackets bonded using SEPs used in restorative dentistry in comparison to orthodontic SEPs. Settings and Design: Department of Orthodontics, Post-graduate dental college, Council of Scientific and Industrial Research (CSIR) laboratory, in vitro study. Methods and Material: Seventy-five freshly extracted human maxillary first premolar teeth were used in this study. Orthodontic maxillary first premolar McLaughlin Bennett Trevisi (MBT) metal brackets (3M Unitek) were used to bond the teeth. The study consisted of two groups. Group A: 25 teeth were etched with Orthodontic SEP Transbond Plus (3M Unitek). Group B: Experimental group which is divided into two subgroups, Experimental subgroup a and Experimental subgroup b. Subgroup a: 25 teeth were etched with Restorative purpose SEP Adper SE Plus (3M ESPE). Sub group-b: 25 teeth were etched with Restorative purpose SEP Adper Easy One (3M ESPE). In all the groups, the same adhesive material, Transbond XT (3M Unitek) was used for fixing the brackets. All the 75 teeth were subjected to shear force to test shear bond strength by using Instron machine. Statistical Analysis: ANOVA & Scheffe multiple comparison test were used. Results and Conclusion: Shear bond strength of brackets using orthodontic purpose SEP, Transbond Plus, is more than the SEPs used for restorative purpose, i.e., Adper SE Plus and Adper Easy One. Restorative purpose SEPs are not suitable for orthodontic bonding of brackets. Orthodontic bonding, self-etching primer (SEP), shear bond strength (SBS)

Analysis of microleakage and marginal gap presented by new polymeric systems in class V restorations: An in vitro study

ObjectiveEvaluating the contraction of polymerization effect of silorane-based composite on dental interface in enamel. Materials and MethodsEighty class V cavities were confectioned in forty extracted molar teeth and restored with different combinations of resinous-based and bond system. They were divided into the following groups: (G1) three-step etch-and-rinse adhesive system and methacrylate-based resin, (G2) two-step etch-and-rinse adhesive system and methacrylate-based resin, (G3) Filtek P-90 self-conditioning adhesive system and methacrylate-based resin, (G4) Adper SE Plus self-conditioning adhesive system and methacrylate-based resin, (G5) three-step etch-and-rinse adhesive system and silorane-based resin, (G6) two-step etch-and-rinse adhesive system and silorane-based resin, (G7) Filtek P-90 self-conditioning adhesive system and silorane-based resin, (G8) Adper SE Plus self-conditioning adhesive system and silorane-based resin. ResultsGroup 7 showed lower marginal leakage when compared with all other groups (p = 0.001). ConclusionsThe results allows suggesting that silorane-based resinous system is adequate to promote more satisfactory marginal sealing than any other combination, since the system is combined with its own bond system.

Influence of the depth of intraradicular dentin on the pushout bond strength of resin materials.

The aim of the present study was to evaluate the pushout bond strength between glass-fiber posts to different regions of intraradicular dentin with different materials for adhesive cementation. After endodontic filling, 40 teeth were divided into five groups according to adhesive cementation: Adper Single Bond 2+RelyX ARC, Excite DSC+RelyX ARC (EXC), Adper SE Plus+RelyX ARC (SEP), RelyX Unicem, and Set. After the bonding process, roots were sectioned obtaining slices to be analyzed from each third. The bond strength was measured using the pushout test in a universal testing machine (Emic DL 3000) at a cross-head speed of .5mm/minutes in different areas of the post space (cervical, middle, and apical). Data were subjected to analysis of variance and Fisher's test (α=.05). The highest values for the pushout bond strength were found for the SEP group in all experimental conditions, without a significant difference for the EXC group in the middle and apical regions. There was a decrease in pushout bond strength in the cervical-apical direction for all groups, except the EXC group, which did not show a difference among the different regions. The different interactions of the resin materials and the intraradicular depth influenced the bond strength of adhesives materials to dentin substrate.

Comparative study of adhesive systems applied to different regions of dental substrate

OBJECTIVE: The aim of this study was to evaluate the bond strength (BS) of different self-etching adhesive systems to bovine dentin.METHODS: For this purpose, 50 teeth were flattened with silicon carbide abrasive papers and randomly divided into 5 groups: SB – Single Bond Plus; Group AEO – Adper Easy One; Group ADH – AdheSE; Group ASE – Adper SE Plus and Group Clear – Clear Fill. After adhesive system application, 5 Tygon cylinders (1.8 mm×2 mm) were placed on the vestibular surface of each tooth, filled with resin composite (Filtek Z350) and light activated. Three composite resin cylinders were fabricated for each bovine crown, one being located in the incisal region, one in the middle third and one in the cervical region, totaling 30 composite resin test specimens (TS) for each group. The TS were submitted to the microshear bond strength test in a Universal Test Machine Kratos), at a cross-head speed of 0.5 mm/min.RESULTS: The BS was calculated and analyzed by ANOVA (one-way) and Tukey’s test (p<0.05). The highest BS values were obtained in Group SB and there were no significant differences between the adhesive systems tested in the middle and cervical thirds. In the fracture type analysis it was found that adhesive failure was dominant for all groups.CONCLUSION: The conventional two-step adhesive system SB presented the highest bond strength mean to bovine dentin for all the regions.

Cytotoxicity, genotoxicity and antibiofilm activity on Streptococcus mutans of an experimental self-etching adhesive system containing natural Butia capitata oil

This study evaluated the biocompatibility and antibiofilm effects on Streptococcus mutans of an experimental self-etching adhesive system formulated with a natural vegetable product. The cytotoxicity of Clearfil Protect Bond (CPB), Clearfil SE Bond (CSEB), Adper SE Plus (AP), an experimental adhesive containing Butia capitata oil (EA) and an oil-free experimental adhesive as control (CA) was tested on 3T3/NIH mouse fibroblasts. Genotoxicity was indicated by micronuclei formation, and cell alterations were analyzed using light microscopy. To evaluate the effect of the adhesives on S. mutans biofilm, biomass samples were collected for dry weight and bacterial viability analyses, and the pH of the culture media was determined daily as an indicator of biofilm acidogenicity. The CA primer and EA uncured bond adhesive were the least toxic. No statistical difference was observed between EA and the untreated control, and EA showed similar effect to CPB. These findings suggest EA is biocompatible and presents activity against S. mutans biofilm.

Effect of thermocycling on the durability of etch-and-rinse and self-etch adhesives on dentin.

The objective was to compare bond strengths of adhesives with/without thermocycling and to analyze the micromorphology of resindentin interfaces. Flat dentin surfaces were prepared and divided into eight groups to bond with four etch-and-rinse adhesives (Optibond FL, Adper Scotchbond Multi-Purpose, Optibond Solo Plus, and Single Bond 2) and four self-etch adhesives (Clearfil SE Bond, Adper SE Plus, Clearfil S(3) Bond and Adper Easy Bond). Specimens were further divided into two subgroups subjected for with/without thermocycling and then subjected to both micro-tensile test and resin-dentin interface evaluation. The results revealed that there were significant differences in bond strength between the groups with and without thermocycling for all etch-and-rinse groups and for the Adper Easy Bond self-etch group (p<0.01). Clearfil SE Bond demonstrated highly durable bond strengths. Furthermore, more silver ion uptake was observed at the resin-dentin interfaces for all etch-and-rinse adhesives and Adper SE Plus and Adper Easy Bond after thermocycling.

Effect of an erosive challenge on the enamel-composite resin interface in primary teeth: an in vitro study

AIM: The aim of this study was to evaluate whether different adhesive systems (etch-and-rinse or self-etch) render enamel-composite resin interface in primary teeth more susceptible to erosive challenge. MATERIAL AND METHODS: Thirty enamel specimens from caries-free primary incisors were selected and cavities were prepared for restoration. According to adhesive protocols, specimens were divided into groups: G1 (Adper Single Bond 2), G2 (Adper SE Plus), and G3 (35% phosphoric acid + Adper SE Plus). After restorative procedures, half of the surface of enamel and restorative material was protected with nail varnish, thus, only half of the sample was subjected to the erosive challenge (immersion in Coca-Cola®, 3 cycles of 5 minutes, for 5 days). Samples were analysed quantitatively through Knoop microhardness, the indentations were made on enamel-composite interface. Data were submitted to statistical analysis (Student’s t test, two-way ANOVA, p&lt;0.05). RESULTS: It showed that different adhesive systems did not significantly affect the percentage of superficial microhardness change after an erosive challenge (p=0.387). However, although no significant difference was observed, G2 (self-etch system) showed the lowest percentage of superficial microhardness change. CONCLUSION: The use of different adhesive systems did not influence superficial microhardness of enamel-composite interface after an erosive challenge. The incomplete removal of the smear layer, though self-etch systems, suggests a greater ability to withstand the erosive challenge on the enamel-resin interface.

Effect of caries removal techniques on bond strength to caries affected dentin on gingival wall: AFM observation of dentinal surface

Objective: The purpose of this study was to evaluate the effect of different caries removal techniques on the bond strength of two adhesive systems. Materials and Methods: Seventy human molar teeth that had proximal carious lesions were randomly divided into four groups according to the technique used to remove the caries: a conventional steel bur, an Er:YAG laser, a chemomechanical Carisolv® gel, and air polishing. The groups were then divided into two subgroups according to the adhesives used: Clearfil S3 (Kuraray Co., Ltd, Tokyo, Japan) and Adper SE Plus (3 M ESPE, St Paul, MN, USA). The enamel and superficial dentin of the crown was flattened and caries were removed using different methods. Teeth were restored with composite and three 1 mm2 stick-shaped microtensile specimens were prepared from each tooth. For each removal technique, the surface roughness of one dentin sample was analyzed using atomic force microscopy (AFM). The microtensile bond strength data were then analyzed using a two-way ANOVA, Kruskal–Wallis and Mann–Whitney U tests, and multiple comparison tests (p = 0.05). Results: The two-way ANOVA showed that the effects of the cavity preparation techniques and adhesive systems and their interaction were statistically significant (p < 0.05). The μTBS values were highest when bonding with Adper SE Plus to cavities prepared with the steel bur (37.20 ± 11.65 MPa) and lowest when bonding with Clearfil S3 Bond to cavities prepared with the Er:YAG laser (16.74 ± 6.95 MPa). Conclusion: The caries removal techniques affected the bond strength values of the self-etch adhesive systems.

Effect of sodium hypochlorite as dentinal pretreatment on bonding strength of adhesive systems

This study aimed to evaluate the effect of sodium hypochlorite (NaOCl) pretreatment on bond strength of adhesive systems to different dentin regions. Forty human molars were randomly assigned according to different adhesive systems (Adper Single Bond 2; Clearfil SE Bond; Adper SE Plus; G-Bond), pretreatments (control and NaOCl - deproteinization) and dentin regions (proximal, superficial occlusal [SO] and deep occlusal [DO]), n = 5. Cylindrical cavities were performed at the proximal and occlusal surfaces of each sample. For deproteinization, 10% NaOCl was applied on conditioned dentin for 60 s before the adhesive systems application. Two occlusal and one proximal slice were obtained from each sample and submitted to the push-out test. The mode of fracture was analyzed. The data were subjected to three-way ANOVA and Tukey test (P < 0.05). There was statistically significant difference between the adhesive systems (P < 0.01) and dentin regions (P < 0.01); however, the pretreatment did not significantly affect the bond strength values (P > 0.05). The bond strength values were higher for the proximal surface, followed by SO and later by DO, being influenced by the adhesive system. The two-step self-etch adhesive systems presented the highest bond strength results. The deproteinization pretreatment showed similar bonding effectiveness to the conventional adhesive technique. The dentin region plays a rule on the bond strength values.

Effect of 10% Sodium Ascorbate on Shear Bond Strength of Bleached Teeth - An in-vitro Study.

Patient often requires some additional interventions such as replacement of old restorations, laminates and veneers after bleaching, for aesthetic purposes. The residual oxygen inhibits polymerization of resin based materials which results in reduced bond strength of the restorations. Some techniques are available to solve the clinical problems related to the post bleach compromised bond strength. The purpose of this study is to evaluate, the role of 10% sodium ascorbate on reversing the compromised bond strength and compare enamel shear bond strength of 5th and 6th generation dentine bonding agents on bleached and unbleached teeth. Eighty freshly extracted human anterior teeth were assigned in to Group A and Group B of 40 teeth each. Samples in both groups were subdivided in to 4 subgroups of 10 teeth each. In Group A composite resins was bonded using 5th generation dentine bonding agent (3M Single Bond) and Group B was bonded using 6th generation (3M ESPE Adper SE Plus). Subgroups were subjected to the procedure as, A1;B1 etching and bonding (control), A2; B2 bleaching, etching and immediate bonding, A3; B3 bleaching,10% ascorbic acid treatment for 10 minutes after that etching and bonding immediately, A4; B4 bleaching, storage in artificial saliva for 4 days and then etching and bonding. Pola office, in office bleach (SDI (082216) was used for bleaching. The specimens were subjected to shear load in a Universal testing machine to evaluate bond strength. A decrease in bond strength was seen with 6th generation adhesive system compared to 5th generation bonding system, which is statistically significant, p<0.001. Treating the bleached enamel surfaces when treated with 10% sodium ascorbate, which reverses the compromised bond strength and is a good alternative to delayed bonding.

Effect of silorane-based adhesive system on bond strength between composite and dentin substrate.

Context:The complexities of the oral environment, the dentin substrate, and the different bond and composite resin systems represent a challenge to the maintenance of reasonable bond between the composite resin and the tooth structure.Aims:To evaluate the effect of the adhesive system on bond strength between silorane-based composite resin and dentin.Materials and Methods:Fourteen human molars extracted were selected and vertically cut into 3 dentin fragments, randomly divided among the experimental groups and restored with Z250 and P90 composite resin using different adhesive protocols (Adper Single Bond 2, Silorano primer, Adper SE Plus, and Scotchbond Multiuse). Two composite resin cylinders were built up on each dentin surface (n = 10) and subjected to a micro-shear bond strength test.Statistical Analysis Used:Kruskal–Wallis one-way analysis of variance and Tukey test (P = 0.05).Results:According to the results, Kruskal–Wallis test evidenced at least one statistical significant difference (P = 0.001). The Tukey test showed statistically significant differences among the group (P < 0.05). Group PSM8 (P90 + SM) showed statically significant higher results when compared with groups PSP4 (P90 + SP), PSB2 (P90 + SB), and ZSE5 (Z250 + SE).Conclusion:The results evidenced that the monomer of the adhesive system has an effect on bond strength between the composite resin and dentin.

Bond strength to dentin of total-etch and self-etch adhesive systems

OBJECTIVE: To assess the bond strength to dentin of the Single Bond (3M ESPE) and XP Bond (Dentsply) total-etch and Adper SE Plus (3M ESPE) self-etch adhesive systems. METHODS: Fifteen healthy human third molars were randomly allocated across three different groups of five teeth each according to the adhesive system. The occlusal portion of each tooth was removed under refrigeration using a flexible diamond disc (EXTEC, Enfield, CT, USA) down to an area of dentin that did not reveal enamel, as confirmed under a 40X stereo microscope (Ramsor, São Paulo, Brazil). A standardized smear layer was created with #600 grit silicon-carbide paper. The adhesive systems were applied as per manufacturer recommendations, with the exception of the Adper SE Plus system, which was triple-polymerized. Composite resin blocks (5 mm) were placed on the dentin surface. The specimens were stored in distilled water for 24 hours at 37ºC. Using a flexible diamond disc (EXTEC, Enfield, CT, USA), toothpick-like specimens with an adhesive area of less than 1 mm² were obtained. A microtensile bond test was then carried out using a universal testing machine (KRATOS) with a crosshead speed of 0.5 mm/min. Analysis of variance (ANOVA) and Tukey's test were used for comparisons. RESULTS: The bond strength values obtained with each adhesive system were as follows: XP Bond, 96.24 MPa; Adper Single Bond, 72.39 MPa; Adper SE Plus, 49.91 MPa. CONCLUSION: In terms of bond strength to dentin, conventional adhesives outperform self-etching systems.

Two-year clinical performance of dimethacrylatebased composite restorations repaired with a silorane-based composite.

To investigate the clinical performance of a silorane-based composite resin used for repairing dimethacrylate- based composite restorations. One operator repaired defective dimethacrylate-based resin restorations that were randomly assigned to one of two treatment groups: control (n=50), repaired with Adper SE Plus and Filtek P60 Posterior Restorative (3M ESPE); or test (n=50), repaired with P90 System Adhesive Self-Etch Primer and Bond and Filtek P90 Low Shrink Posterior Restorative (3M ESPE). After 1 week, restorations were finished and polished. Two calibrated examiners (weighted Kappa≥0.78) evaluated the repaired restorations, blindly and independently, at baseline, after 6 months, 1 and 2 years. The parameters examined were marginal adaptation, anatomic form, surface roughness, marginal discoloration, postoperative sensitivity, and secondary caries. The restorations were classified as Alfa, Bravo, or Charlie, according to modified US Public Health Service criteria. Variation in the levels of clinical parameters over time was evaluated by Friedman's ANOVA (α=0.05). The Mann-Whitney test assessed the differences between the materials for all clinical criteria at baseline, 6-month, 1- and 2-year recalls (α=0.05). The Wilcoxon test compared each composite resin for all clinical criteria at the same recalls (α=0.05). After two years, 79 repaired restorations were re-examined. No statistically significant differences were found between the materials at baseline or at the 2-year recall (p>0.05). Comparing baseline and 2-year recall, there was a statistically significant difference for marginal discoloration (p=0.029) in silorane-based composite restorations. After two years, the clinical performance of the silorane-based composite was similar to that of the dimethacrylate-based composite when used to make repairs.

Mechanical properties of components of the bonding interface in different regions of radicular dentin surfaces

Statement of problemThe mechanical properties of the adhesive materials used in intraradicular treatments could vary according to the interaction between the restorative material and dentin substrate. An evaluation of these properties is essential to determine the success of the luting procedures performed on glass-fiber posts. PurposeThe purpose of this study was to evaluate the mechanical properties of dentin adhesives, resin cements, and the dentin that underlies the bonding interface in different thirds of intraradicular dentin. Material and methodsForty extracted, single-rooted human teeth were used in this study. After the endodontic treatment of the post spaces, the teeth were divided into 5 groups (n=8): Adper Single Bond 2 + RelyX ARC, Excite DSC + RelyX ARC, Adper SE Plus + RelyX ARC, RelyX Unicem, and Set. The hardness and elastic modulus values were measured at the adhesive interface in different thirds of the radicular dentin by using an ultramicrohardness tester. The data were subjected to 2-way ANOVA and the Fisher protected least significant difference test (α=.05). ResultsIn the underlying dentin, the highest Martens hardness values were found in the apical region for all groups; the exceptions were the groups with the self-etching adhesive. In the adhesive layer, the highest Martens hardness values were obtained for the Adper SE Plus + RelyX ARC group; further, no statistical differences were found among the different regions for this group. RelyX ARC had the lowest Martens hardness and elastic modulus values in the apical regions when used with Adper Single Bond 2 and Adper SE Plus. No differences were found in the Martens hardness and elastic modulus values for the self-adhesive resin cement in the regions investigated. ConclusionThe mechanical properties of adhesive materials and the underlying dentin are influenced by the interaction between the two as well as by the depth of the analyzed intraradicular area.

Effect of 2 years water aging on bond strength stability of adhesive systems to artificial caries-affected primary dentin

PurposeTo evaluate the effect of 2 years of water aging on microtensile bond strength (μTBS) of an etch-and-rinse and a self-etch adhesive system to sound (S) and artificial caries-affected primary dentin (CAD). MethodsOcclusal cavities were prepared in 24 primary molars. Half of the specimens were submitted to a pH-cycling model to simulate artificial caries-affected dentin. Teeth were randomly restored either with two-step etch-and-rinse adhesive Adper Single Bond 2 (SB) or two-step self-etch system Adper SE Plus (SE). After 24h of storage, the teeth were sectioned into two halves. One half was sectioned into sticks (0.8mm2) to be tested immediately under μTBS testing. The same procedure was performed in the other half after storage in distilled water for 2 years (2y). Data were analyzed by three-way repeated measures ANOVA and Tukey tests (α=0.05). ResultsThe μTBS values of both adhesive systems significantly decreased after 2 years aging (SB: S – 38.4%, CAD – 23.9%; SE: S – 17.1%, CAD – 15.7%) (p<0.001). SE showed lower μTBS values compared with SB, regardless of storage period (p<0.001). Higher μTBS were detected in sound dentin, regardless of adhesive (p<0.001). ConclusionThe degradation of the resin-dentin bonds occurred after 2 years of water aging, regardless of the substrate condition or type of adhesive. However, the etch-and-rinse adhesive system is preferable due to the highest μTBS in both periods.

The influence of air temperature for solvent evaporation on bonding of self-etch adhesives to dentin.

Objective:This study evaluated the effect of air temperature (warm or cold) for solvent evaporation on bonding and nanoleakage of self-etching adhesives to dentin.Materials and Methods:The adhesives Clearfil 3S Bond [S3], OptiBond All-In-One [OB], Adper SE Plus [AD], and Silorane adhesive [SI] were applied on dentin surfaces, and a warm (60 ± 2°C) or cold air (20 ± 1°C) was applied and light-cured. After water storage (24 h), the teeth were sectioned into sticks (0.8 mm2) and tested in tensile. Then, they were immersed in a 50% solution of silver nitrate, photo-developed and the nanoleakage observed in a scanning electron microscope. The bond strength and nanoleakage pattern were analyzed by two-way analysis of variance and post hoc Tukey's test (α =0.05).Results:Higher bond strength and lower silver nitrate uptake were observed for the adhesives under warm condition (P < 0.05). AD and SI showed better adhesive results than S3 and OB (P < 0.05).Conclusion:The use of a warm air was useful to improve the bonding and diminish the nanoleakage of adhesive systems to dentin.

Comparative evaluation of the bonding efficacy of sixth and seventh generation bonding agents: An In-Vitro study.

Aims:To compare the shear bond strength of sixth generation and seventh generation bonding agents to dentin.Materials and Methods:Eighty human maxillary premolars were reduced to expose flat surface of dentin and divided into four equal groups, which were bonded using following bonding agents: Sixth generation bonding agents, Adper SE Plus and Xeno III and Seventh generation bonding agents, Adper Easy One and Xeno V. Composite cylinders were then built using a plastic mould on these prepared dentinal surfaces. Samples were stored in distilled water for 24 hours and tested for shear bond strength with universal testing machine. Shear force was applied perpendicular to the long axis of composite cylinder at adhesive-tooth interface until debonding occurred. The data so obtained were tabulated and analyzed statistically using independent-samples t test and analysis of variance (ANOVA) testResults:The seventh generation adhesives showed significantly higher shear bond strength to dentin compared to sixth generation adhesives (P < 0.01). The highest value of shear bond strength was obtained from Adper Easy One system, while Adper SE Plus gave the lowest shear bond strength values.Conclusions:Seventh generation adhesives are more advantageous than sixth generation adhesives in dentin bonding as it requires less time, fewer steps, and better bond strength.

An in vitro evaluation of effect of eugenol exposure time on the shear bond strength of two-step and one-step self-etching adhesives to dentin.

Objectives:To evaluate the effect of the eugenol exposure time of an eugenol-based provisional restorative material on the shear bond strength of two-step and one-step self-etching adhesives to dentin, at three different time intervals of 24 h, 7 days, and 14 days.Materials and Methods:Forty extracted human posterior teeth were sectioned mesiodistally to obtain two halves and the resulting 80 halves were randomly assigned into four groups of 20 specimens each (Group-I, -II, -III, and -IV). Cavities of specified dimensions were prepared to expose dentin surface. In Group-I, temporarization was carried out with noneugenol cement (Orafil-G) for 24 h (control group). In Group-II, -III, and -IV, temporarization was carried out with eugenol cement (intermediate restorative material (IRM)) for 24 h, 7 days, and 14 days, respectively. Each group was further divided into two subgroups of 10 teeth each for two-step (Adper SE Plus) and one-step (Adper Easy One) self-etch adhesive systems, respectively. A plastic tube loaded with microhybrid composite resin (Filtek Z-350, 3M) was placed over the dentin surface and light cured. The specimens were subjected to shear stress in universal testing machine.Results:Group-II yielded low shear bond strength values compared with Group-III, -IV, and Group-I, which was statistically significant.Conclusions:The prior use of eugenol containing temporary restorative material reduced the bond strength of self-etch adhesive systems at 24-h period. No reduction in bond strength at 7 or 14 days exposure was observed with either two-step or one-step self-etch adhesive.

Bond strength between silorane-based composite resin and dentin substrate

The aim of this study was to evaluate the bond strength between composite resin and dentin using different bond systems. Sixteen human molars extracted were selected. Each tooth was vertically cut in 3 dentin fragments of 2 mm of thickness (n=42) and randomly divided among the groups. Groups 1 was used Adper Single Bond 2, for groups 2 Silorano primer, groups 3 Adper SE Plus, and 4 Scotchbond Multiuse. Two composite resin cylinders were built up on each dentin surface (n=10) and subjected to a micro shear bond strength test until failure. To evaluated the results were used the Kruskal-Wallis OneWay Analysis of Variance and Tukey Test (p=0.05). Kruskal-Wallis test evidenced at least one statistical significant difference (p=0.001). The Tukey test showed statistical significant differences among the group (P&lt;0.05). Group 1 showed statically significant higher results when compared with group 4. The results of this study evidenced that the adhesive system can effect the bond strength between silorano-based composite resin and dentin.

Bonding of Simplified Adhesive Systems to Caries-affected Dentin of Primary Teeth

To evaluate the bonding of simplified adhesive systems to sound and caries-affected dentin of primary teeth with microtensile (µTBS) and nanoleakage (NL) tests. Occlusal cavities were prepared in 36 sound second primary molars. Half of the specimens were submitted to pH cycling to simulate caries-affected dentin. Teeth were randomly restored with one of three materials: the etch-and-rinse adhesive system Adper Single Bond 2 (SB), the two-step self-etching adhesive system Adper SE Plus (SE), and the one-step self-etching adhesive system Adper Easy One (EASY). After storage for 24 h, specimens with cross-sectional areas of 0.8 mm2 were prepared for microtensile testing (1 mm/min). One stick from each tooth was immersed in silver nitrate solution (24 h) and allowed to develop for 8 h in order to score the nano leakage with SEM. The fracture pattern was evaluated using a stereomicroscope (400X). The µTBS means were analyzed by two-way ANOVA and Tukey's post-hoc test. For NL, the Kruskal- Wallis and Mann-Whitney tests were used (α < 0.05). SB (35.5 ± 3.5) showed the highest µTBS value to sound dentin, followed by EASY (26.3 ± 1.9) and SE (18.2 ± 6.5) (p < 0.05). No difference among materials was observed for caries-affected dentin (SB: 17.8 ± 4.2; SE: 13.9 ± 3.2; EASY: 14.4 ± 4.2, p > 0.05). For all groups, adhesive/mixed fracture prevailed. Caries affected dentin promoted silver nitrate uptake into the adhesive interface; however, with SE, the nano leakage was more pronounced than in the other adhesive systems, even in sound dentin. Caries-affected dentin negatively influences the bond strength and nano leakage of the two-step etch-and-rinse and one-step self-etching adhesive systems tested in primary teeth.