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Kibe K, Hatayama T, Shimada Y. In vitro performance of an autocured universal adhesive system in bonding to dentin. BMC Oral Health 2023; 23:933. [PMID: 38012568 PMCID: PMC10683120 DOI: 10.1186/s12903-023-03645-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 11/09/2023] [Indexed: 11/29/2023] Open
Abstract
BACKGROUND The successful integration of resin-based dental adhesives significantly impacts restorative dentistry, providing efficient and aesthetically pleasing caries treatments. Among various adhesives, one-step self-etching adhesives (1-SEAs) have gained popularity due to their simplicity and short application time. However, concerns have been raised regarding their bonding performance and marginal adaptation characteristics, which differ from two-step self-etching adhesives (2-SEAs) and three-step etch-and-rinse adhesives. Additionally, light-cured bonding materials may encounter challenges in deep cavities and inaccessible areas, necessitating extended light irradiation time. Autocured bonding materials are a potential solution, but limited comparative studies have been conducted on their performance. METHODS In this in vitro study, we evaluated a new autocured universal bonding material (Bondmer Lightless 2) and compared the results with recent light-cured bonding materials. Microshear bond strength (μSBS) tests were performed on 25 human molars using five different combinations of adhesives and composite resins: Bondmer Lightless 2 with Estelite Bulk Fill Flow (BE group), Bondmer Lightless 2 with a prototype composite resin (BO group), Prime&Bond Universal with SDR flow + (PS group), Scotchbond Universal with Filtek Bulk Fill (SF group), and G-Premio Bond with Gracefil BulkFlo (GG group). The bond strengths and failure modes were assessed using a universal testing machine and scanning electron microscope (SEM), respectively. Marginal adaptation was evaluated using swept-source optical coherence tomography (SS-OCT) and confocal laser scanning microscopy (CLSM) on 40 sound bovine maxillary incisors. RESULTS The μSBS test showed no significant differences in bond strength among the tested groups. Most failure modes were observed at the bond interface between the adhesive and the dentin. The autocured bonding material demonstrated significantly higher marginal adaptation (SI%) than PS, SF, and GG. The CLSM images corresponded with gaps observed in the SS-OCT images, indicating improved marginal sealing in the autocured group. CONCLUSIONS The new autocured universal bonding material exhibited comparable bond strength to a conventional light-cured material while demonstrating a superior marginal adaptation level. This finding suggested that the autocured material could be a valuable alternative, especially when extended light irradiation would pose a challenge. Further clinical studies would be warranted to evaluate the performance of the autocured bonding material in actual restorative dental practice.
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Affiliation(s)
- Kota Kibe
- Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-Ku, Tokyo, 113-8510, Japan
| | - Takashi Hatayama
- Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-Ku, Tokyo, 113-8510, Japan.
| | - Yasushi Shimada
- Division of Oral Health Sciences, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-Ku, Tokyo, 113-8510, Japan
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Effect of Different Application Modalities on the Bonding Performance of Adhesive Systems to Dentin: A Systematic Review and Meta-Analysis. Cells 2023; 12:cells12010190. [PMID: 36611983 PMCID: PMC9818277 DOI: 10.3390/cells12010190] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/11/2022] [Accepted: 12/30/2022] [Indexed: 01/05/2023] Open
Abstract
Diverse types of dental adhesives exhibit different cytotoxic outcomes on cells in vitro. Currently, no standard adhesive application technique has so far been decisive for clinicians for better durability of resin-dentin bonds of adhesive systems. The purpose of this study was to systematically review the literature to evaluate the bonding performance of adhesive systems to dentin by using different application modalities. The systematic research strategy was conducted by two reviewers among multiple databases: PubMed, Scopus, Web of Science, Embase, and Scielo. In vitro studies reporting the effects of additional steps for the application of adhesive systems on the bond strength to dentin were selected. Meta-analysis was performed using Review Manager Software version 5.3.5 using the random effects model. The methodological quality of each in vitro study was assessed according to the parameters of a previous systematic review. The electronic research through different databases generated a total of 8318 references. After the examination of titles and abstracts, a total of 106 potentially relevant studies accessed the full-text evaluation phase. After full-text examination, 78 publications were included for the qualitative analysis, and 68 studies were included in the meta-analysis. Regarding the etch-and-rinse adhesive systems, the application modalities that improved the overall bond strength were the application of a hydrophobic resin layer (p = 0.005), an extended application time (p < 0.001), an application assisted by an electric current (p < 0.001), a double-layer application (p = 0.05), the agitation technique (p = 0.02), and the active application of the adhesive (p < 0.001). For self-etch adhesive systems, the techniques that improved the overall bond strength were the application of a hydrophobic resin layer (p < 0.001), an extended application time (p = 0.001), an application assisted by an electric current (p < 0.001), a double-layer application (p < 0.001), the agitation technique (p = 0.01), and the active application of the adhesive (p < 0.001). The in vitro evidence suggests that the application of adhesive systems using alternative techniques or additional strategies may be beneficial for improving their bond strength to dentin. The application modalities that favored the overall bond strength to dentin were an extended application time, a double-layer application, an application assisted by an electric current, the active application of the adhesive, and the application of a hydrophobic resin layer. Worth mentioning is that some techniques are intended to increase the degree of the conversion of the materials, and therefore, improvements in the biocompatibility of the materials can be expected.
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Guarda MB, Pacheco RR, Silva ID, Brandt WC, Sinhoreti MAC, Vitti RP. Microtensile bond strength of resin composite to dentin using different adhesive systems and directions of electric current. Braz Dent J 2022; 33:86-93. [PMID: 36477969 PMCID: PMC9733368 DOI: 10.1590/0103-6440202204870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 09/06/2022] [Indexed: 12/12/2022] Open
Abstract
Thisstudy aimed to evaluate the effect of the electric current direction application on the resin composite-dentin bond strength using three adhesive systems. Human molar teeth were distributed according to the adhesive system (two-step self-etch - Clearfil SE Bond, Kuraray [CSE]; one-step self-etch - Single Bond Universal, 3M ESPE [SBU]; and two-step etch-and-rinse - Adper Single Bond 2, 3M ESPE [SB2]), electric current direction (without electric current - control, direct and reverse electric currents - 35µA), and storage time (24h - immediate and 6 months). Resin composite blocks (Filtek Z350XT, 3M ESPE) were bonded to dentin. The teeth/resin composites specimens were stored in distilled water at 37ºC for 24 hours and 6 months for the microtensile bond strength (µTBS) test (n = 10; ~12 sticks for each tooth). Failure patterns were analyzed on a stereomicroscope and classified as cohesive-dentin, cohesive-resin, adhesive or mixed. Adhesive penetration into dentin and hybrid layer formation were evaluated in a scanning electron microscope (n = 6). Data were submitted to a three-way ANOVA followed by Tukey's post hoc test (α = 0.05). There are no differences in µTBS when the adhesive systems were applied under direct and reverse electric currents, but both electric currents increased the µTBS for all adhesive systems. SBU showed the lowest µTBS values for control groups in both storage times and direct electric current in 6 months of storage. The adhesive failure pattern was more frequently observed in all groups. The electric current formed long resin tags for all adhesive systems. Storage for 6 months did not significantly decrease µTBS values. Both directions of electric current (positive and negative charges) at 35µA can increase the µTBS of the adhesive systems tested to dentin.
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Affiliation(s)
| | | | | | | | | | - Rafael Pino Vitti
- Herminio Ometto University Center, School of Dentistry, Araras, SP, Brazil
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Saeed NA, Tichy A, Shimada Y. Bonding of universal adhesives to bur-cut dentin: Effect of double application and dentin moisture level. Dent Mater J 2022; 41:724-730. [PMID: 35676046 DOI: 10.4012/dmj.2021-310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study investigated how the double application of adhesives and dentin moisture level influence the microtensile bond strength (µTBS) of universal adhesives containing different hydrophilic monomers to bur-cut dentin. Four universal adhesives (Scotchbond Universal, Clearfil Universal Bond Quick, Prime&Bond Universal, BeautiBond Universal) were applied to wet and dry bur-cut dentin either in one or two layers. The µTBS test was performed after 25,000 thermal cycles, and scanning electron microscopy was used for the analysis of failure mode and interfacial ultrastructure. Double application significantly improved µTBS on wet dentin (p<0.001), but the effect was not significant on dry dentin (p>0.050). Double application also enhanced the formation of resin tags and limited voids within the adhesive layer of BeautiBond Universal. Dentin moisture had a significant effect on µTBS only if the adhesives were applied in a single layer (p=0.007). Except for Prime&Bond Universal, the tested universal adhesives performed better on dry dentin.
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Affiliation(s)
- Nooruldeen Ali Saeed
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Antonin Tichy
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.,Institute of Dental Medicine, First Faculty of Medicine of the Charles University and General University Hospital in Prague
| | - Yasushi Shimada
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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Demirci M, Tuncer S, Tekçe N, Baydemir C. The effect of different application modes of a 1-step self-etch adhesive on the clinical performance of Class I composite restorations: A randomized controlled clinical trial. J ESTHET RESTOR DENT 2022; 34:1039-1050. [PMID: 35604035 DOI: 10.1111/jerd.12933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 05/01/2022] [Accepted: 05/02/2022] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To evaluate the clinical performance of a 1-step self-etch dentin adhesive that was applied according to the manufacturers' recommendations, doubling the adhesive application time and layer in Class I cavities with a composite resin. MATERIALS AND METHODS A total of 39 patients aged between 14 and 43 (mean age: 19.1) years were enrolled in the study. Each patient received three restorations. In these three restorations, a 1-step self-etch adhesive was applied according to the manufacturer's recommendations (control group), by doubling the adhesive application time, and with double layers. The restorations were evaluated according to modified USPHS criteria at baseline, and 1, 2, 3, and 4-year recalls. RESULTS After 4 years, the success rate was 100% for restorations with the adhesive applied according to the manufacturers' recommendations, 96.9% for restorations applied by doubling the adhesive application time, and 93.8% for restorations applied with double adhesive layers. There was no significant difference between the three application methods among all the evaluation periods regarding the evaluation criteria. CONCLUSIONS The 4-year success rates of a 1-step self-etch dentin adhesive that was applied according to the manufacturers' recommendation, by doubling the adhesive application time, and with double layers were excellent. CLINICAL SIGNIFICANCE It is not recommended to double the adhesive application time nor apply a double layer of a 1-step self-etch adhesive because it does not improve the clinical performance of Class I composite restorations.
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Affiliation(s)
- Mustafa Demirci
- Department of Restorative Dentistry, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
| | - Safa Tuncer
- Department of Restorative Dentistry, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
| | - Neslihan Tekçe
- Department of Restorative Dentistry, Faculty of Dentistry, Kocaeli University, Kocaeli, Turkey
| | - Canan Baydemir
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Kocaeli University, Kocaeli, Turkey
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USLU TEKCE A, ATALAY C, DURSUN MN, ERTAN AA, YAZICI AR. Does Double-layer Application of a Universal Adhesive Affect Its Bonding to Different Tooth Substrates? CLINICAL AND EXPERIMENTAL HEALTH SCIENCES 2021. [DOI: 10.33808/clinexphealthsci.932520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ugurlu M. Effect of the double application of universal adhesives on the dentine bond strength after radiotherapy. Aust Dent J 2020; 65:181-188. [PMID: 31900933 DOI: 10.1111/adj.12744] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/29/2019] [Indexed: 02/04/2023]
Abstract
BACKGROUND This study aimed to evaluate the effect of double application of universal adhesives on bond strength to dentine after ionizing radiation. METHODS One hundred and forty caries-free human third molars were used. Half of the teeth were irradiated (IR) (70.2 Gy). The IR and non-IR teeth were assigned into seven groups (n = 10). Universal adhesives Single Bond Universal (3M Oral Care), Gluma Bond Universal (Heraeus Kulzer) and Prime&Bond Elect (Dentsply) were employed (following manufacturer's instructions and double application). Two-step self-etch adhesive Clearfil SE Bond (Kuraray Noritake) was used as control. After composite build-ups were bonded to mid-coronal occlusal dentine surfaces, the specimens were stored in water (37°C/24 h) and sectioned into microspecimens. The specimens were subjected to μTBS testing (1.0 mm/min). Failure analysis was performed using stereomicroscope and scanning electron microscopy. Data were analysed with two-way ANOVA and Tukey's test (P = 0.05). RESULTS The radiotherapy caused reduction in the bond strength of universal adhesives when the adhesives were used with single application after radiotherapy (P < 0.05). The double application resulted in increased bond strength of the universal adhesives to IR dentine (P < 0.05). CONCLUSIONS The double application was beneficial in improving the dentine bond strength of universal adhesives affected by radiotherapy after ionizing radiation.
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Affiliation(s)
- M Ugurlu
- Department of Restorative Dentistry, Faculty of Dentistry, Süleyman Demirel University, Isparta, Turkey
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Chowdhury AFMA, Islam R, Alam A, Matsumoto M, Yamauti M, Carvalho RM, Sano H. Variable Smear Layer and Adhesive Application: The Pursuit of Clinical Relevance in Bond Strength Testing. Int J Mol Sci 2019; 20:ijms20215381. [PMID: 31671751 PMCID: PMC6861976 DOI: 10.3390/ijms20215381] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 10/25/2019] [Accepted: 10/25/2019] [Indexed: 11/20/2022] Open
Abstract
The removal or modification of smear layers that cover the dentin is critical to allow the penetration of adhesive molecules and to ensure a strong bond between resin and dentin. Aiming to establish a model for clinically-relevant dentin-bond testing, we evaluated the effects of smear layers created by abrasives having similar coarseness (180-grit SiC paper; fine-grit diamond bur) and application modes (single application; double application) on the microtensile bond strengths (µTBS) of two currently available universal adhesives (G-Premio Bond; Scotchbond Universal Adhesive) and a two-step self-etch adhesive (Clearfil Megabond 2). Sixty extracted human third molars were used for the μTBS test. Data were analyzed by three-way ANOVA and Tukey’s test (α = 0.05). Fracture modes were determined using stereomicroscopy. An additional 24 third molars were prepared for observation of the resin–dentin interface by TEM and adhesive-smear layer interaction by SEM. μTBS was significantly affected by the adhesives and their application modes (p < 0.001), implying that the double application of universal adhesives should be recommended to improve their performance. The effect of smear layers was not significant (p > 0.05), indicating that 180-grit SiC papers could be used to prepare dentin as a substitute for fine-grit diamond burs for dentin-bond testing in laboratory settings.
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Affiliation(s)
- Abu Faem Mohammad Almas Chowdhury
- Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Rafiqul Islam
- Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Arefin Alam
- Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Mariko Matsumoto
- Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Monica Yamauti
- Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
| | - Ricardo Marins Carvalho
- Department of Oral Biological and Medical Sciences, Division of Biomaterials, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada.
| | - Hidehiko Sano
- Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
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Fujiwara S, Takamizawa T, Barkmeier WW, Tsujimoto A, Imai A, Watanabe H, Erickson RL, Latta MA, Nakatsuka T, Miyazaki M. Effect of double-layer application on bond quality of adhesive systems. J Mech Behav Biomed Mater 2018; 77:501-509. [DOI: 10.1016/j.jmbbm.2017.10.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 09/26/2017] [Accepted: 10/02/2017] [Indexed: 11/30/2022]
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Vieira HH, Catelan A, Leite Lima DAN, Aguiar FB, Giorgi MC, Sartini Paulillo LM, Lovadino J. Influence of matrix type on microshear bond strength test. DENTAL CADMOS 2016. [DOI: 10.1016/s0011-8524(16)30066-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nagpal R, Sharma P, Manuja N, Tyagi SP, Singh UP, Singh S, Singh P. Influence of double application technique on the bonding effectiveness of self-etch adhesive systems. Microsc Res Tech 2015; 78:489-94. [PMID: 25864526 DOI: 10.1002/jemt.22499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 03/07/2015] [Indexed: 11/09/2022]
Abstract
AIM To evaluate and compare the effect of double-application of single-step self-etch adhesives using microleakage study and to analyze the dentin-adhesive interfacial micromorphology. METHODS In total, 72 extracted human premolars were divided into three groups for different self-etch adhesives (G Bond, GC [GB], Optibond, Kerr [OB], and Xeno V Plus, Dentsply [XV]). Class V cavities were prepared. Each group was further divided into two subgroups (n = 10) according to the placement technique of the adhesive, using the single-application [subgroup (a)] or double-application method [subgroup (b)]. Resin composite (Z 250, 3M ESPE, St. Paul, MN) was used to restore the cavities and light cured for 40 s. Twenty samples from each group were subjected to microleakage study. Two samples from both the subgroups of the three adhesives were used for scanning electron microscopic examination of the resin-dentin interfacial ultrastructure. Dye leakage scores were subjected to statistical analysis using Kruskal-Wallis and Mann-Whitney U-tests at significance level of P < 0.05. RESULTS GB depicted significantly more microleakage which was significantly greater than OB and XV. The double application led to significant decrease in microleakage of GB with no significant effect on the microleakage scores of other two all-in-one adhesives, that is OB and XV. CONCLUSION Double application of all-in-one self-etch adhesives improves the marginal sealing ability in dentin although it appears to be product dependent.
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Affiliation(s)
- Rajni Nagpal
- Department of Conservative Dentistry & Endodontics, Kothiwal Denta L College & Research Centre, Moradabad, Uttar Pradesh, India
| | - Pallavi Sharma
- Department of Conservative Dentistry & Endodontics, Kothiwal Denta L College & Research Centre, Moradabad, Uttar Pradesh, India
| | - Naveen Manuja
- Department of Pediatric Dentistry, Kothiwal Dental College & Research Centre, Moradabad, Uttar Pradesh, India
| | - Shashi Prabha Tyagi
- Department of Conservative Dentistry & Endodontics, Kothiwal Denta L College & Research Centre, Moradabad, Uttar Pradesh, India
| | - Udai Pratap Singh
- Department of Conservative Dentistry & Endodontics, Kothiwal Denta L College & Research Centre, Moradabad, Uttar Pradesh, India
| | - Shipra Singh
- Department of Conservative Dentistry & Endodontics, Kothiwal Denta L College & Research Centre, Moradabad, Uttar Pradesh, India
| | - Payal Singh
- Department of Conservative Dentistry & Endodontics, Kothiwal Denta L College & Research Centre, Moradabad, Uttar Pradesh, India
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Giannini M, Makishi P, Ayres APA, Vermelho PM, Fronza BM, Nikaido T, Tagami J. Self-Etch Adhesive Systems: A Literature Review. Braz Dent J 2015; 26:3-10. [DOI: 10.1590/0103-6440201302442] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 11/28/2014] [Indexed: 11/22/2022] Open
Abstract
This paper presents the state of the art of self-etch adhesive systems. Four topics are shown in this review and included: the historic of this category of bonding agents, bonding mechanism, characteristics/properties and the formation of acid-base resistant zone at enamel/dentin-adhesive interfaces. Also, advantages regarding etch-and-rinse systems and classifications of self-etch adhesive systems according to the number of steps and acidity are addressed. Finally, issues like the potential durability and clinical importance are discussed. Self-etch adhesive systems are promising materials because they are easy to use, bond chemically to tooth structure and maintain the dentin hydroxyapatite, which is important for the durability of the bonding.
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Taschner M, Kümmerling M, Lohbauer U, Breschi L, Petschelt A, Frankenberger R. Effect of Double-layer Application on Dentin Bond Durability of One-step Self-etch Adhesives. Oper Dent 2014; 39:416-26. [DOI: 10.2341/13-168-l] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Purpose
The aim of this in vitro study was 1) to analyze the influence of a double-layer application technique of four one-step self-etch adhesive systems on dentin and 2) to determine its effect on the stability of the adhesive interfaces stored under different conditions.
Materials and Methods
Four different one-step self-etch adhesives were selected for the study (iBondSE, Clearfil S3 Bond, XenoV+, and Scotchbond Universal). Adhesives were applied according to manufacturers' instructions or with a double-layer application technique (without light curing of the first layer). After bonding, resin-dentin specimens were sectioned for microtensile bond strength testing in accordance with the nontrimming technique and divided into 3 subgroups of storage: a) 24 hours (immediate bond strength, T0), b) six months (T6) in artificial saliva at 37°C, or c) five hours in 10 % NaOCl at room temperature. After storage, specimens were stressed to failure. Fracture mode was assessed under a light microscope.
Results
At T0, iBond SE showed a significant increase in microtensile bond strength when the double-application technique was applied. All adhesive systems showed reduced bond strengths after six months of storage in artificial saliva and after storage in 10% NaOCl for five hours; however at T6, iBond SE, Clearfil S3 Bond, and XenoV+ showed significantly higher microtensile bond strength results for the double-application technique compared with the single-application technique. Scotchbond Universal showed no difference between single- or double-application, irrespective of the storage conditions.
Conclusion
The results of this study show that improvements in bond strength of one-step self-etch adhesives by using the double-application technique are adhesive dependent.
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Affiliation(s)
- M Taschner
- Michael Taschner, DMD, assistant professor, University Hospital of Erlangen, Dental Clinic 1, Erlangen, Germany
| | - M Kümmerling
- Maria Kümmerling, post graduate student, University Hospital of Erlangen, Dental Clinic 1, Erlangen, Germany
| | - U Lohbauer
- Ulrich Lohbauer, MSc, PhD, FADM, Dental Clinic 1, Dental Materials Lab, Erlangen, Germany
| | - L Breschi
- Lorenzo Breschi, DDS, PhD, professor, Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna, Bologna, Italy
| | - A Petschelt
- Anselm Petschelt, DMD, PhD, professor and chair, University Hospital of Erlangen, Dental Clinic 1, Erlangen, Germany
| | - R Frankenberger
- Roland Frankenberger, DMD, PhD, professor and chair, Department of Operative Dentistry and Endodontology, University of Marburg, Marburg, Germany
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Feitosa VP, Watson TF, Vitti RP, Bacchi A, Correr-Sobrinho L, Correr AB, Sinhoreti MAC, Sauro S. Prolonged curing time reduces the effects of simulated pulpal pressure on the bond strength of one-step self-etch adhesives. Oper Dent 2012; 38:545-54. [PMID: 23215642 DOI: 10.2341/12-180-l] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to evaluate the effects of extended light-curing procedures on the microtensile bond strength (μTBS) of one-step self-etch adhesives (1-SEAs) submitted to simulated pulpal pressure. Coronal deep-dentin specimens were bonded using Clearfil S3 Bond (S3), Adper Easy Bond (EB), or G-Bond Plus (GB) following the manufacturers' recommendations and light-cured for 10 seconds or 40 seconds. The dentin-bonded specimens were stored in distilled water for 24 hours without pulpal pressure (control) or submitted to 20 cm H2O simulated pulpal pressure for 24 hours. The specimens were cut into matchsticks and subjected to μTBS testing. The data were statistically analyzed using the three-way analysis of variance and Tukey's tests (p<0.05). Debonded sticks were investigated through scanning electron microscopy. EB obtained higher bond strengths than GB and S3. However, prolonged light activation (40 seconds) provided higher μTBS for all adhesives when submitted to pulpal pressure. Conversely, pulpal pressure caused a drop in μTBS in EB and S3 when light-cured for 10 seconds. A mixed failure mode was mainly attained for the control groups, whereas the specimens submitted to pulpal pressure failed in the adhesive mode. The μTBS of GB was not affected by pulpal pressure when light-cured for 10 seconds. Adhesive was the most prevalent failure mode, except when light-cured for 40 seconds, which showed predominantly cohesive failure. Extended curing times improved the resistance of 1-SEAs to simulated pulpal pressure.
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Feitosa VP, Leme AA, Sauro S, Correr-Sobrinho L, Watson TF, Sinhoreti MA, Correr AB. Hydrolytic degradation of the resin-dentine interface induced by the simulated pulpal pressure, direct and indirect water ageing. J Dent 2012; 40:1134-43. [PMID: 23000523 DOI: 10.1016/j.jdent.2012.09.011] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 09/05/2012] [Accepted: 09/11/2012] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES The aim of this study was to compare the hydrolytic effects induced by simulated pulpal pressure, direct or indirect water exposure within the resin-dentine interfaces created with three "simplified" resin bonding systems (RBSs). METHODS A two-step/self-etching (CSE: Clearfil SE Bond), one-step/self-etching (S3: Clearfil S3) and etch-and-rinse/self-priming (SB: Single-bond 2) adhesives were applied onto dentine and submitted to three different prolonged (6 or 12 months) ageing strategies: (i) Simulated Pulpal Pressure (SPP); (ii) Indirect Water Exposure (IWE: intact bonded-teeth); (iii) Direct Water Exposure (DWE: resin-dentine sticks). Control and aged specimens were submitted to microtensile bond strength (μTBS) and nanoleakage evaluation. Water sorption (WS) survey was also performed on resin disks. Results were analysed with two-way ANOVA and Tukey's test (p < 0.05). RESULTS The μTBS of CS3 and SB dropped significantly (p < 0.05) after 6 months of SPP and DWE. CSE showed a significant μTBS reduction only after 12 months of DWE (p = 0.038). IWE promoted no statistical change in μTBS (p > 0.05) and no evident change in nanoleakage. Conversely, SPP induced a clear formation of "water-trees" in CS3 and SB. WS outcomes were CS3 > SB = CSE. CONCLUSION The hydrolytic degradation of resin-dentine interfaces depend upon the type of the in vitro ageing strategy employed in the experimental design. Direct water exposure remains the quickest method to age the resin-dentine bonds. However, the use of SPP may better simulate the in vivo scenario. However, the application of a separate hydrophobic solvent-free adhesive layer may reduce the hydrolytic degradation and increase the longevity of resin-dentine interfaces created with simplified adhesives.
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Affiliation(s)
- Victor P Feitosa
- Department of Restorative Dentistry, Division of Dental Materials, Piracicaba Dental School, State University of Campinas, Av. Limeira 901, Piracicaba 13414-903, SP, Brazil.
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Non-invasive quantification of resin–dentin interfacial gaps using optical coherence tomography: Validation against confocal microscopy. Dent Mater 2011; 27:915-25. [DOI: 10.1016/j.dental.2011.05.003] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 05/03/2011] [Accepted: 05/11/2011] [Indexed: 11/21/2022]
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