Polymerization Stress and Gap Formation of Self-adhesive, Bulk-fill and Flowable Composite Resins

2020 ◽  
Vol 45 (6) ◽  
pp. E308-E316
Author(s):  
EL Nakano ◽  
ASC de Souza ◽  
LCC Boaro ◽  
LH Catalani ◽  
RR Braga ◽  
...  
Keyword(s):  
Testing Machine ◽  
Composite Resins ◽  
Gap Formation ◽  
Marginal Gap ◽  
Universal Testing ◽  
Interfacial Gap ◽  
And Control ◽  
Flowable Composites ◽  
Vertise Flow ◽  
Fill Materials

Clinical Relevance Bulk-fill materials show a similar or better performance than control flowable materials regarding interfacial integrity. However, some self-adhesive composites need improvements to achieve competitive performance. SUMMARY Objective: This laboratory study compared the polymerization stress and gap formation of self-adhesive, bulk-fill and control flowable composites. The degree of conversion (DC) and post-gel shrinkage were also assessed. Methods: Two self-adhesive (Vertise Flow and Fusio Liquid Dentin), two bulk-fill (Tetric N-Flow Bulk-Fill and Filtek Bulk-Fill Flowable Restorative), and two control flowable (Z350 XT Flowable Restorative and Tetric N-Flow) composites were evaluated. Polymerization stress (PS) was determined in a universal testing machine (n=5). Gap formation was evaluated by scanning electron microscopy in class I restorations (n=6). DC was measured by Fourier transform infrared spectroscopy (n=3). Post-gel volumetric shrinkage (VS) was measured using the strain gauge method (n=5). Data were submitted to one-way analysis of variance or a Kruskal-Wallis test (α=0.05). Results: Vertise Flow and Fusio Liquid Dentin presented the highest interfacial gap (27%±5% and 21%±6%, respectively), which was associated with their highest PS (4.1±0.8 MPa and 3.5±0.6 MPa, respectively) and DC (63%±2% and 60%±2%, respectively) in spite of the lowest VS (1.0%±0.2% and 1.0%±0.3%, respectively). Tetric N-Flow Bulk-Fill and Filtek Bulk-Fill Flowable Restorative presented similar PS (2.9± 0.3 MPa and 2.4±0.2 MPa, respectively) to both control materials. However, the Tetric N-Flow Bulk-Fill showed the lowest gap (7%±2%) and the highest DC (64.3%±0.4%), and the Filtek Bulk-fill presented a marginal gap (17.8%±3.4%) and a DC (54.5%±2.7%) similar to the control materials. The VS values of both bulk-fill materials were similar to those of Tetric N-Flow and lower than that of Z350 XT Flowable Restorative. Conclusions: Bulk-fill composites showed either similar or significantly lower interfacial gaps and PS than the control flowable composites. The self-adhesive composites showed a significantly higher gap percentage and PS than the control and bulk-fill materials.

scholarly journals Perbedaan Kekuatan Geser Reparasi Gigi Tiruan Cekat dengan Resin Komposit Packable dan Flowable (Uji Laboratoris pada permukaan logam NiCr)

2012 ◽  
Vol 19 (2) ◽  
pp. 102
Author(s):  
Endang Wahyuningtyas ◽  
Suparyono Saleh ◽  
Sri Budi Barunawati
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Composite Resins ◽  
Distilled Water ◽  
Research Subjects ◽  
Flowable Composite ◽  
Diamond Bur ◽  
Universal Testing

Latar Belakang. Resin komposit merupakan bahan pilihan untuk reparasi Gigi Tiruan Cekat porcelain fused to metal (PFM) Karena estetis baik dan manipulasi mudah. Tujuan penelitian ini adalah mengetahui perbedaan kekuatan geser perlekatan resin komposit pada permukaan logam Gigi Tiruan Cekat dengan menggunakan resin komposit jenis packable dan jenis flowable. Metode penelitian. Subjek penelitian berupa logam NiCr (Noritake, Japan) berbentuk silinder dengan diameter 10 mm dan tinggi 3 mm. Penelitian dibagi menjadi dua kelompok, masing-masing terdiri dari 10 subjek. Kelompok pertama reparasi dengan resin komposit packable (Z250™ 3M ESPE, USA) dan kelompok kedua reparasi dengan resin komposit flowable (Dyad flow, Kerr, USA). Permukaan subjek dikasari dengan wheel diamond bur, dietsa dengan asam fosfat 37 % (Scotchbond™, 3M ESPE, USA) kemudian dicuci dan dikeringkan, selanjutnya diaplikasikan silan (Rely X™ Ceramic Primer, 3M ESPE, USA) dan bonding (Adper™ Single Bond, 3M ESPE, USA). Permukaan kemudian dilapisi dengan resin komposit packable dan flowable, disinari selama 40 detik. Subjek penelitian direndam di dalam distilled water dan dimasukkan ke dalam incubator dengan suhu 37°C selama 7 hari. Uji kekuatan geser dilakukan dengan menggunakan Universal Testing Machine. Data dianalisis dengan uji t. hasil uji t menunjukkan terdapat perbedaan bermakna kekuatan geser reparasi gigi tiruan cekat pada permukaan logam (p<0,05). Kesimpulan penelitian ini adalah kekuatan geser reparasi pada permukaan logam dengan menggunakan resin komposit flowable yang mengandung bahan coupling agent lebih tinggi dibandingkan reparasi pada permukaan porselen dengan menggunakan resin komposit packable. Background. One of selected material by repairing the fixed partial denture was composite resin because of its good aesthetics and low manipulation. The aim. This research was aimed at identifying the differences of shear bond strength of composite resin on metal surface by using different composite resins, namely packable and flowable composite resins. Method. The research subjects were cylinders with 10 mm in diameter and 3 mm in height. The research subjects with metal material of NiCr (Noritke, Japan) involved two groups. The first group comprising 10 repair subjects with composite packable (Z250™, 3M ESPE, USA) and 10 repair subjects with flowable composite (Dyad flow, Kerr, USA). The surface of the subjects were roughned with wheel diamond bur and etched with 37% phosphate acid (Scotbond™, 3M ESPE, USA) were applied. The surface was then coated with packable and flowable composite resins and light-cured for 40 seconds. The research subjects were immersed in distilled water and put into the incubator at temperature of 37°C for 7 days. The shear bond strength test was conducted using the Universal Testing Machine. Data were analyzed using t-test. The result. The research result showed that there were differences of shear bond strength of repair between packable and flowable composite resins. The result of t-test indicated significant diffrences on metal surface (p<0,05). The conclusion of this research is that shear bond strength of repair with flowable composite which contain coupling agent has higher shear bond strength than that of packable composite resin.

Effect of Adhesive Boosters on Bond Strength of Bleached Teeth in Orthodontic Bonding

2021 ◽  
pp. 030157422110044
Author(s):  
I Ranganayakulu ◽  
D Praveen Kumar Varma ◽  
Padma Priya CV ◽  
RSVM Raghu Ram ◽  
K Anand Viswanadh ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Carbamide Peroxide ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Significant Difference ◽  
Maxillary Premolars ◽  
And Control

Objectives: To evaluate and compare the effect of adhesion boosters on shear bond strength (SBS) of orthodontic brackets on bleached teeth. Materials and Methods: A sample of 90 extracted maxillary premolars was equally divided into 2 groups of bleached and non-bleached teeth. Twenty-two percent carbamide peroxide gel was used as an agent for bleaching. Each group was further divided equally into 3 subgroups depending on the type of adhesive booster used (Enhance LC, All-bond 2, and no adhesive booster [control]) and maxillary premolars brackets were bonded. Debonding was done with a universal testing machine, and the SBS was recorded. Results: The SBS of non-bleached teeth was highest for All-bond 2 (14.78 ± 2.47 MPa) followed by Enhance LC (13.15 ± 3.49 MPa) and control (10.30 ± 1.06 MPa). The SBS of bleached teeth was highest for All bond 2 (12.23 ± 1.41 MPa) followed by Enhance LC (11.76 ± 1.71 MPa) and control (9.63 ± 1.06 MPa). All subgroups showed a significant difference in SBS (P = .000) on bleached and non-bleached teeth. The SBS showed a significant difference between the bleached and non-bleached teeth in All-bond 2 group (P = .019). Conclusion: Adhesive boosters increased the SBS of both bleached and non-bleached teeth significantly. Among the two adhesive boosters used, All-bond 2 showed more SBS values.

Comparison of Flexural Properties of Bulk-fill Restorative/Flowable Composites and Their Conventional Counterparts

2020 ◽  
Vol 45 (1) ◽  
pp. 41-51 ◽  
Author(s):  
AH Eweis ◽  
AU Yap ◽  
NA Yahya
Keyword(s):  
Water Solution ◽  
Artificial Saliva ◽  
Flexural Modulus ◽  
Testing Machine ◽  
Flexural Properties ◽  
Significance Level ◽  
Tukey Test ◽  
Universal Testing ◽  
Flexural Testing ◽  
Flowable Composites

SUMMARY The objectives of the study were to compare the flexural modulus and strength of restorative and flowable bulk-fill resin-based composites (RBCs) to their conventional counterparts and to determine the effects of conditioning environment on their flexural properties. The materials evaluated included three conventional RBCs (Filtek Z350, Tetric N Ceram, and Beautifil II), three restorative bulk-fill RBCs (Filtek Bulk-Fill Restorative, Tetric N Ceram Bulk-Fill, and Beautifil Bulk-fill Restorative), as well as three flowable bulk-fill RBCs (Filtek Bulk-Fill Flowable, Tetric N Flow Bulk-Fill, and Beautifil Bulk-Fill Flowable). Specimens were fabricated using customized stainless-steel molds, finished, measured, and randomly divided into four groups. The various RBCs were conditioned in the following mediums (n=10) for seven days at 37°C: air, artificial saliva (SAGF), 0.02 N citric acid, and 50% ethanol-water solution. After conditioning, the specimens were rinsed, blotted dry, measured, and subjected to flexural testing using a universal testing machine. Data were subjected to statistical analysis using analysis of variance and the Tukey test at a significance level of α = 0.05. Significant differences in flexural properties were observed between materials and conditioning mediums. Bulk-fill restorative RBCs exhibited higher flexural modulus than their bulk-fill flowable and conventional counterparts. With the exception of Filtek Bulk-Fill Flowable, bulk-fill flowable RBCs had significantly higher flexural strength than bulk-fill restorative and conventional RBCs. Flexural properties were highest when RBCs were conditioned in air and generally the lowest after exposure to ethanol.

scholarly journals Influence of cavo superficial enamel acid-etching on the microtensile bond strength of low-shrinkage composite resin

2020 ◽  
Vol 49 ◽  
Author(s):  
Raquel Devisate BORGHI ◽  
Erick Kamiya COPPINI ◽  
Josué Junior Araújo PIEROTE ◽  
João Victor Frazão CÂMARA ◽  
Luis Alexandre Maffei Sartini PAULILLO
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Adhesive System ◽  
Composite Resins ◽  
Acid Etching ◽  
Microtensile Bond Strength ◽  
Posterior Teeth ◽  
Cutting Machine ◽  
Universal Testing ◽  
Significant Difference

Abstract Introduction To prevent the shrinkage stresses produced during polymerization, composite resins of low polymerization shrinkage were developed. Objective To evaluate the microtensile bond strength in class I cavities restored by acid-etching the cavosurface angle and with composite resins indicated for posterior teeth. Material and method 48 healthy molars were selected and divided into six groups (n = 8), considering that the cavosurface enamel of three groups was etched with 35% phosphoric acid. The teeth were restored with the Clearfil SE Bond adhesive system and Filtek Z350 XT, Empress Direct, and Charisma Diamond composite resins, which were light-cured for 40 seconds. After 24 hours, the teeth were taken to a cutting machine, which produced sections in the buccolingual and mesiodistal directions. This resulted in toothpicks of 0.9×0.9 mm that were taken to the universal testing machine for the microtensile bond strength test. Statistical analysis was performed with ANOVA and Tukey’s test (p < 0.05). Result There was no statistically significant difference between the groups evaluated. Conclusion Acid-etching the cavosurface angle did not affect the performance of restorations, probably due to the adhesive system used.

scholarly journals Diametral tensile strength of composite resins submitted to different activation techniques

2006 ◽  
Vol 20 (3) ◽  
pp. 214-218 ◽  
Author(s):  
Denise Sá Maia Casselli ◽  
Claudia Cia Worschech ◽  
Luis Alexandre Maffei Sartini Paulillo ◽  
Carlos Tadeu dos Santos Dias
Keyword(s):  
Tensile Strength ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Composite Resins ◽  
Universal Testing ◽  
Halogen Light ◽  
Indirect Composite ◽  
Diametral Tensile Strength ◽  
Curing Systems

The aim of this study was to evaluate the diametral tensile strength (DTS) of composite resins submitted to different curing techniques. Four composite resins were tested in this study: Targis (Ivoclar), Solidex (Shofu), Charisma (Heraeus-Kulzer) and Filtek Z250 (3M Espe). Sixty-four cylindrical specimens were prepared and divided into eight groups according to each polymerization technique (n = 8). The indirect composite resins (Targis and Solidex) were polymerized with their respective curing systems (Targis Power and EDG-lux); Charisma and Filtek Z250 were light-cured with conventional polymerization (halogen light) and additionally, with post-curing systems. Specimens were stored in artificial saliva at 37°C for one week. DTS tests were performed in a Universal Testing Machine (0.5 mm/min). The data were statistically analyzed by ANOVA and Duncan tests. The results were (MPa): Z250/EDG-lux: 69.04ª; Z250/Targis Power: 68.57ª; Z250/conventional polymerization: 60.75b; Charisma/Targis Power: 52.34c; Charisma/conventional polymerization: 49.17c; Charisma/EDG-lux: 47.98c; Solidex: 36.62d; Targis: 32.86d. The results reveal that the post-cured Z250 composite resin showed the highest DTS means. Charisma composite presented no significant differences when activation techniques were compared. Direct composite resins presented higher DTS values than indirect resins.

scholarly journals Assessment of flexural strength and color alteration of heat-polymerized acrylic resins after simulated use of denture cleansers

2005 ◽  
Vol 16 (2) ◽  
pp. 124-128 ◽  
Author(s):  
Sandra Sato ◽  
Márcia Rosa Sobreira Cavalcante ◽  
Iara Augusta Orsi ◽  
Helena de Freitas Oliveira Paranhos ◽  
Osvaldo Zaniquelli
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Control Group ◽  
Significance Level ◽  
Color Changes ◽  
Acrylic Resins ◽  
Universal Testing ◽  
Color Alteration ◽  
And Control ◽  
Denture Cleansers

The purpose of this study was to assess flexural strength and color alteration of acrylic resins immersed in denture cleansers for different periods of time. Rectangular specimens (65x10x3mm) made from three heat-polymerized acrylic resins (Lucitone 550, QC-20 and Triplex) were assigned to three denture cleansers groups (Bony Plus, Corega Tabs and Efferdent Plus) and a control group (immersion in water). Soaking trials of 15 min and 8 h simulated 30 days of use. Flexural strength testing was carried out with 105 specimens on a universal testing machine. Color alterations were visually assessed by examination of photographs taken from 21 specimens. Flexural strength means (in MPa) were analyzed statistically by analysis of variance and Tukey's test at 5% significance level. There were significant differences (p<0.01) among the resins Lucitone (89.439 ± 7.962), Triplex (88.024 ± 5.167) and QC-20 (83.379 ± 7.153). No significant differences (p>0.05) were found either among the denture cleansers (Bony Plus = 87.693 ± 6.943; Corega Tabs = 86.955 ± 7.114; Efferdent Plus = 86.195 ± 7.865 and control = 86.536 ± 7.012) or between the soaking periods (15 min = 86.875 ± 7.625 and 8 h = 87.432 ± 7.355) throughout the soaking cycles simulating 30 days of use. No color alterations were identified by visual examination. The findings of this study showed that chemical denture cleansers used according to the manufacturers' specifications did not cause flexural strength alterations or color changes in heat-polymerized acrylic resins submitted to soaking cycles that simulated 30 days of use.

Bonding Effectiveness of Contemporary Materials in Luting Glass-Ceramic to Dentine: An In Vitro Study

2020 ◽  
pp. 232020682097349
Author(s):  
Alev Mutlu ◽  
Ays¸e Atay ◽  
Ebru Çal
Keyword(s):  
Bond Strength ◽  
Glass Ceramic ◽  
Failure Modes ◽  
Testing Machine ◽  
Third Molar ◽  
Resin Cements ◽  
Occlusal Surfaces ◽  
Flowable Composites ◽  
Vertise Flow ◽  
Self Etch

Aim: To evaluate the shear bond strength (SBS) of resin cements, flowable composites, and a preheated composite in luting glass-ceramic to dentin. Materials and Methods: In total, 108 noncaries human third molar teeth embedded in acrylic blocks, grinded from the occlusal surfaces until dentin was exposed, and divided into 9 randomized groups ( n = 12). In total, 108 ceramic samples prepared in disc shape (3mm × 3mm) from IPS e. max CAD (Ivoclar Vivadent) blocks. Four adhesive resin cements: Variolink Esthetic DC (Ivoclar Vivadent), G-CEM LinkForce (GC), Panavia V5 (Kuraray Noritake), Maxcem Elite Chroma (Kerr), and three flowable composites: G-ænial Universal Flo (GC), Herculite XRV Ultra Flow (Kerr), Vertise Flow (Kerr), and one preheated composite: Enamel Plus HRI (Micerium) luted to the prepared occlusal surfaces of the teeth with total-etch, self-etch, and self-adhesive protocols. Then samples were thermocyled (5,000 cycles, 5–55°C, dwell time 20 s). SBS test was performed in a universal testing machine (at 0.5 mm/min). Failure modes were examined under a stereomicroscope at ×25 magnification. Data were analyzed using Kruskal–Wallis and Dunn–Bonferroni tests ( α = 0.05). Results: There were statistically significant differences among material types ( P < .05). Highest SBS values found in G-ænial Universal Flo (15.43 ± 5.67), and the lowest values obtained in Maxcem Elite Choroma (SA) (1.25 ± 1.47). There were no significant differences between self-etch (Panavia V5, Maxcem Elite Choroma [SE]) and self-adhesive (Maxcem Elite Choroma [SA], Vertise Flow) protocols ( P > .05). Conclusion: Flowable composites can be alternatives to resin cements when bonded with total-etch procedures. Bond strength of self-etch and self-adhesive applications is still to be developed.

scholarly journals Degree of conversion and water sorption of self-adhesive and conventional flowable composites

2021 ◽  
Vol 19 ◽  
pp. e208556
Author(s):  
Ladan Ranjbar Omrani ◽  
Mahdi Abbasi ◽  
Fariba Motevasselian ◽  
Mohmad Amin Yektaei ◽  
Farhood Najafi
Keyword(s):  
Water Sorption ◽  
Artificial Saliva ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Flowable Composite ◽  
Significant Difference ◽  
Post Hoc ◽  
Flowable Composites ◽  
Vertise Flow

Aim: Self-adhesive flowable composite resins have been recently introduced to the market. Degree of conversion (DC) and water sorption (WS) are two important parameters affecting the properties of restorative materials. This study aimed to assess the DC and WS of a self-adhesive flowable composite resin in comparison with two conventional flowable composite resins. Methods: Vertise Flow (VF) self-adhesive and Tetric-N Flow (TF) and Grandio Flow (GF) conventional flowable composites were evaluated in this in vitro, experimental study. The DC (n=3) was determined by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The WS (n=7) was measured after 7 days of immersion in artificial saliva according to ISO 4049 specifications. Data were analyzed by one-way ANOVA and a post-hoc test (p<0.05). Results: VF showed the highest DC percentage (84.3%) followed by GF (72.79%) and TF (68.7%). The latter two had no significant difference (p=0.8). WS was the highest in VF (55.2 μg/mm3), and the two conventional flowable composites had a significant difference in WS (19.5 μg/mm3 in TF and 11 μg/mm3 in GF; p<0.001). Conclusions: Flowable composite resins had significant differences in DC and WS, and VF demonstrated the highest DC and WS.

scholarly journals Shear bond strength of different materials used for pit and fissure sealing

New Medicine ◽  
2019 ◽  
Vol 23 (4) ◽  
Author(s):  
Emil Korporowicz ◽  
Piotr Firlej ◽  
Dariusz Gozdowski ◽  
Dorota Olczak-Kowalczyk
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Optical Microscope ◽  
Fissure Sealant ◽  
Significant Difference ◽  
Materials Used ◽  
Flowable Composites ◽  
Vertise Flow ◽  
Fissure Sealing

Introduction. Pit and fissure sealing is a effective procedure in preventing caries, as proven in numerous clinical trials. Materials used for this technique are usually resin-based fissure sealants, but some studies suggested using flowable composites as well. The latest generations of these materials include self-adhesive flowable composites and bulk fill composites. Retention of these materials is one of the main factors that contribute to caries prevention. Therefore, shear bond strength tests that determine the material’s ability to bond with the enamel may help determine their clinical effectiveness. Aim. The aim of the study was to assess the shear bond strength to the enamel of the following materials: Helioseal F (Ivoclar Vivadent), Vertise Flow (Kerr), and SDR (Dentsply Sirona) with XP Bond (Dentsply Sirona). Material and methods. 15 permanent third molars extracted for orthodontic reasons with prepared flat enamel surfaces were randomly divided into three groups. Tested materials ? Helioseal F, Vertise Flow and SDR with XP Bond were polymerised on these surfaces, using a mould. Samples were immersed in distilled water, kept at 37°C for 24 h, and then installed in an Instron testing machine. The machine stopped at sample fracture and the load was recorded. Shear bond strengths were calculated. Statistical analysis was performed. Also, samples were assessed using an optical microscope to assess sample failure type. Results. 35 samples, including 11 Helioseal F, 12 Vertise Flow, and 12 SDR were analysed. SDR with XP bond had the highest shear bond strength ? 23.70 (± 6.35) MPa; Vertise Flow ? 20.10 (± 3.95) MPa, and Helioseal F the lowest ? 15.93 (± 3.17) MPa. There was a statistically significant difference between flowable composites (SDR and Vertise Flow) and resin-based fissure sealant (Helioseal F). There were 18 cohesive sample fractures within the enamel, 14 adhesive fractures and 4 mixed. Conclusions. The shear bond strength of SDR with XP Bond and Vertise Flow is statistically significantly higher than that of Helioseal F. However, it is also crucial to clinically assess the effectiveness of these materials.

scholarly journals Repair Strength in Simulated Restorations of Methacrylate- or Silorane-Based Composite Resins

2016 ◽  
Vol 27 (4) ◽  
pp. 463-467
Author(s):  
Rafael Leonardo Xediek Consani ◽  
Tatiane Marinho ◽  
Atais Bacchi ◽  
Ricardo Armini Caldas ◽  
Victor Pinheiro Feitosa ◽  
...  
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Composite Resins ◽  
Single Bond ◽  
Cohesive Failure ◽  
Dental Restorations ◽  
Universal Testing ◽  
Repair Procedure ◽  
Composite Samples

Abstract The study verified the bond strength in simulated dental restorations of silorane- or methacrylate-based composites repaired with methacrylate-based composite. Methacrylate- (P60) or silorane-based (P90) composites were used associated with adhesive (Adper Single Bond 2). Twenty-four hemi-hourglass-shaped samples were repaired with each composite (n=12). Samples were divided according to groups: G1= P60 + Adper Single Bond 2+ P60; G2= P60 + Adper Single Bond 2 + P60 + thermocycling; G3= P90 + Adper Single Bond 2 + P60; and G4= P90 + Adper Single Bond 2 + P60 + thermocycling. G1 and G3 were submitted to tensile test 24 h after repair procedure, and G2 and G4 after submitted to 5,000 thermocycles at 5 and 55 ?#61616;C for 30 s in each bath. Tensile bond strength test was accomplished in an universal testing machine at crosshead speed of 0.5 mm/min. Data (MPa) were analyzed by two-way ANOVA and Tukey's test (5%). Sample failure pattern (adhesive, cohesive in resin or mixed) was evaluated by stereomicroscope at 30?#61655; and images were obtained in SEM. Bond strength values of methacrylate-based composite samples repaired with methacrylate-based composite (G1 and G2) were greater than for silorane-based samples (G3 and G4). Thermocycling decreased the bond strength values for both composites. All groups showed predominance of adhesive failures and no cohesive failure in composite resin was observed. In conclusion, higher bond strength values were observed in methacrylate-based resin samples and greater percentage of adhesive failures in silorane-based resin samples, both composites repaired with methacrylate-based resin.

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