Biomaterial investigations in dentistry最新文献

{"title":"Fluoride exchange by glass-ionomer dental cements and its clinical effects: a review.","authors":"John W Nicholson,&nbsp;Sharanbir K Sidhu,&nbsp;Beata Czarnecka","doi":"10.1080/26415275.2023.2244982","DOIUrl":"https://doi.org/10.1080/26415275.2023.2244982","url":null,"abstract":"<p><p>The topic of fluoride release and uptake by glass-ionomer (glass polyalkenoate) dental cements is reviewed. The study was based on a literature search carried out using PubMed. The main key words used were <i>glass-ionomer</i> and <i>fluoride</i>, and further refinements were made by adding the keywords <i>anti-microbial</i>, <i>anti-caries</i> and <i>remineralization</i>. Papers were selected from the initial search, which concentrated on fundamental aspects of fluoride release, including kinetics and the influence of the cement composition, and resulting clinical performance against caries. Other relevant papers were cited where they added useful and relevant data. From these published papers, it was possible to explain the detailed mechanism of fluoride release by glass-ionomer cements and also its uptake. Fluoride release has been shown to be a two-step process. In neutral solutions, the steps can be divided into early wash-out and long-term diffusion. In acid conditions, the early wash-out remains, though with greater amounts of fluoride released, and the long-term release becomes one of slow dissolution. The effect of fluoride on the viability of oral micro-organisms has been described, and glass-ionomers have been shown to release sufficient fluoride to reduce the size and viability of adjacent populations of oral bacteria. The effect of low levels of fluoride on the remineralization of tooth tissue has been considered. Levels needed to increase remineralization are much lower than those needed to adversely affect oral bacteria, from which we conclude that glass-ionomers release sufficient fluoride to promote remineralization. Despite this, there remains uncertainty about their overall contribution to sound oral health, given the widespread use of other sources of fluoride, such as toothpastes.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"10 1","pages":"2244982"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10444020/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10197221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of adhesive application errors on dentin bond strength of resin composite.","authors":"Benjamin Michael Schärer,&nbsp;Anne Peutzfeldt","doi":"10.1080/26415275.2022.2138405","DOIUrl":"https://doi.org/10.1080/26415275.2022.2138405","url":null,"abstract":"<p><p><b>Objectives</b>: To investigate the impact of adhesive application errors on dentin bond strength of resin composite. <b>Material and Methods</b>: 165 extracted permanent human molars were ground to mid-coronal dentin. The dentin specimens were treated with one of three adhesive systems (OptiBond FL, Clearfil SE, Scotchbond Universal) either according to manufacturer's instructions or with systematic errors in the application procedure and before application of resin composite (Filtek Z250). After storage (37 °C, 100% humidity, 24 h) shear bond strength (SBS) was measured and data analysed with either one-way ANOVA followed by Tukey tests (OptiBond FL, Scotchbond Universal, control groups) or Kruskal-Wallis followed by Wilcoxon tests (Clearfil SE). Finally, the failure mode of all specimens was assessed. <b>Results</b>: With OptiBond FL and Clearfil SE omitted application (<i>p</i> ≤ 0.0001) as well as no evaporation (<i>p</i> ≤ 0.001) of the solvents in the primer significantly reduced the SBS. Omitted application of the adhesive, respectively the bond, had a negative influence on the SBS of Clearfil SE (<i>p</i> < 0.0001), but not of OptiBond FL (<i>p</i> = 0.776). With Scotchbond Universal, no evaporation of the solvents (<i>p</i> < 0.0001) as well as no light-cure (<i>p</i> = 0.0004) had a significant negative influence on the SBS. Using the adhesive systems according to manufacturer's instructions, Clearfil SE achieved significantly lower SBS than OptiBond FL and Scotchbond Universal (<i>p</i> = 0.0027). Adhesive failure at the dentin surface was generally the most frequent failure mode observed. <b>Conclusion</b>: All three adhesive systems tested were sensitive to application errors. For optimal result and longest possible durability of resin restorations, clinicians should strictly adhere to the manufacturer's instructions.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":" ","pages":"101-109"},"PeriodicalIF":0.0,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9648378/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40692744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Peri-implant bone resorption risk of anterior maxilla narrow single implants: a finite-element analysis.","authors":"Ivan Onone Gialain,&nbsp;Leonardo Folmer Rodrigues da Silva,&nbsp;Marlene Kasumi Gantier Takano,&nbsp;Rafael Yagüe Ballester,&nbsp;Marina Guimarães Roscoe,&nbsp;Josete Barbosa Cruz Meira","doi":"10.1080/26415275.2022.2135516","DOIUrl":"https://doi.org/10.1080/26415275.2022.2135516","url":null,"abstract":"<p><p><b>Statement of the problem:</b> Narrow implants have been recommended in high esthetic demand regions to ensure greater buccal bone thickness (BBT) and minimize soft-tissue recession due to insufficient bone support. However, a limited area of bone-implant interface can increase the risk of peri-implant bone resorption due to occlusal forces. <b>Purpose:</b> This article encourages the use of evidence-based finite element analysis to optimize the aesthetic outcomes in maxillary lateral incisor single-supported implant crown by accurate biomechanical planning. This study aimed to analyze the best implant dimensions that would preserve the maximum BBT and avoid peri-implant bone resorption due to occlusal forces. <b>Materials and methods:</b> A maxilla segment was constructed based on anthropological measurements. Four implant diameters (Ø = 3.25; 3.50; 3.75 or 4.00 mm) and two lengths (<i>L</i> = 10 or 13 mm) were simulated. The occlusal force parameters were defined to simulate clinical conditions. The bone resorption risk analysis was based on Frost's mechanostat theory altering the strain output to strain energy density (SED). The peri-implant bone resorption risk indexes (PIBR_ri) were calculated by dividing the average of the top ten SED elements of the cortical and trabecular buccal wall by the pathologic resorption limit for each bone. <b>Results:</b> For trabecular bone, only the model Ø4.00_L13 exhibited a low PIBR_ri. For cortical bone, all models presented a low PIBR_ri, except for models Ø3.25. <b>Conclusion:</b> The selection of a 3.25 mm dental implant to preserve a 2 mm BBT should be avoided since it generates a high peri-implant bone resorption risk induced by occlusal overload.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":" ","pages":"92-100"},"PeriodicalIF":0.0,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9621276/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40663434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical coherence tomography systems for evaluation of marginal and internal fit of ceramic reconstructions.","authors":"Hiba Al-Imam, Ana R Benetti, Pete Tomlins, Klaus Gotfredsen","doi":"10.1080/26415275.2022.2122468","DOIUrl":"10.1080/26415275.2022.2122468","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the marginal and internal fit of lithium disilicate and zirconia crowns using two optical coherence tomography (OCT) systems in order to estimate inter-system variations.</p><p><strong>Materials and methods: </strong>Ten lithium disilicate and 10 cubic stabilized zirconia crowns were placed on prepared artificial teeth without cement. Marginal discrepancy and internal cement gap of the crowns were assessed on images obtained using a swept source OCT (SS-OCT) and a spectral domain OCT (SD-OCT). Medians and interquartile ranges were calculated for both materials and OCT systems. Thereafter, Wilcoxon signed rank test was carried out.</p><p><strong>Results: </strong>No significant difference was found between the two OCT systems for absolute marginal discrepancy of either lithium disilicate (SS-OCT: 182 µm, SD-OCT: 214 µm; <i>p</i> = .922) or zirconia crowns (SS-OCT: 116 µm, SD-OCT: 121 µm; <i>p</i> = .232). Regarding internal cement gap, no significant difference was found between the two OCT systems for lithium disilicate crowns (SS-OCT: 128 µm, SD-OCT: 128 µm; <i>p</i> = .064). However, for zirconia crowns the SD-OCT showed significantly higher (<i>p</i> = .027) internal cement gap (92 µm) than the SS-OCT (68 µm). Moreover, it was not possible to assess the internal fit of zirconia crowns in 47% and 34% of the sites using SD-OCT and SS-OCT, respectively.</p><p><strong>Conclusions: </strong>No significant difference was noted in the ability of SS-OCT and SD-OCT to assess the marginal and internal fit of lithium disilicate crowns, nor the marginal fit of zirconia crowns. On the contrary, drawbacks regarding the assessment of internal fit of zirconia crowns using both OCT systems were observed.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":" ","pages":"84-91"},"PeriodicalIF":0.0,"publicationDate":"2022-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9543067/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33515668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A simple AI-enabled method for quantifying bacterial adhesion on dental materials.","authors":"Hao Ding,&nbsp;Yunzhen Yang,&nbsp;Xin Li,&nbsp;Gary Shun-Pan Cheung,&nbsp;Jukka Pekka Matinlinna,&nbsp;Michael Burrow,&nbsp;James Kit-Hon Tsoi","doi":"10.1080/26415275.2022.2114479","DOIUrl":"https://doi.org/10.1080/26415275.2022.2114479","url":null,"abstract":"<p><p><b>Purpose:</b> Measurement of bacterial adhesion has been of great interest for different dental materials. Various methods have been used for bacterial counting; however, they are all indirect measurements with estimated results and therefore cannot truly reflect the adhesion status. This study provides a new direct measurement approach by using a simple artificial intelligence (AI) method to quantify the initial bacterial adhesion on different dental materials using Scanning Electron Microscope (SEM) images. <b>Materials and Methods:</b> <i>Porphyromonas gingivalis</i> (<i>P.g.</i>) and <i>Fusobacterium nucleatum</i> (<i>F.n.</i>) were used for bacterial adhesion on dental zirconia surfaces, and the adhesion was evaluated using SEM images at time points of one, seven, and 24 h(s). Image pre-processing and bacterial area measurement were performed using Fiji software with a machine learning plugin. The same AI method was also applied on SEM with <i>Streptococcus mutans</i> (<i>S.m.</i>) inoculated PMMA nano-structured surface at 1, 24, 72, and 168 h(s), and then further compared with the CLSM method. <b>Results:</b> For both <i>P.g.</i> and <i>F.n.</i> initiation adhesion on zirconia, a new linear correlation (r² > 0.98) was found between bacteria adhered area and time, such that: <math><msqrt><mi>b</mi> <mi>acteria</mi> <mi> </mi> <mi>adhered</mi> <mi> </mi> <mi>area</mi> <mi> </mi> <mo>(</mo> <mrow> <msup><mrow><mi>m</mi> <mi>m</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> <mo>)</mo></msqrt> <mo>∝</mo> <mrow><mrow><mi>log</mi></mrow> <mo>⁡</mo> <mrow><mo>(</mo> <mi>time</mi> <mo>)</mo></mrow> </mrow> </math> For S.m. on PMMA surface, live/dead staining CLSM method and the newly proposed AI method on SEM images were strongly and positively associated (Pearson's correlation coefficient <i>r</i> > 0.9), i.e. both methods are comparable. <b>Conclusions:</b> SEM images can be analyzed directly for both morphology and quantifying bacterial adhesion on different dental materials' surfaces by the simple AI-enabled method with reduced time, cost, and labours.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":" ","pages":"75-83"},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9448434/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33454543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness of iodoform-based filling materials in root canal treatment of deciduous teeth: a systematic review and meta-analysis","authors":"Manoelito Ferreira Silva Junior, L. Wambier, Mayara Vitorino Gevert, A. Chibinski","doi":"10.1080/26415275.2022.2060232","DOIUrl":"https://doi.org/10.1080/26415275.2022.2060232","url":null,"abstract":"Abstract Introduction The objective was to review the effectiveness of iodoform-based compared to noniodoform-based filling materials in the root canal treatment of deciduous teeth. Methods This systematic review and meta-analysis used randomized clinical trials with six months or more follow-up. The risk of bias of individual studies and the certainty of the evidence were evaluated (Cochrane risk of bias tool and GRADE, respectively). Results The initial search resulted in 5,127 studies after removal of duplicates. After screening by title and abstract, 34 full-text studies were eligible and 21 remained in the qualitative synthesis and 19 in the meta-analysis. Iodoform-based filling materials resulted in fewer clinical failures when compared to noniodoform-based filling materials at the 6 months (OR = 0.43, 95%CI: 0.19–0.97, p = .04) and 9–12 months (OR = 0.46, 95%CI: 0.23–0.93, p = .03), but not at the 18–30 months follow-up (OR = 1.08, 95%CI: 0.58–2.03, p = .81). When considering radiographic failures, there was no statistical difference between iodoform-based and noniodoform-based filling materials at the 6 months (OR = 0.72, 95%CI: 0.39–1.32, p = .29) and 18–30 months follow-ups (OR = 1.06, 95%CI: 0.51–2.21, p = .87), but fewer radiographic failures were detected at the 9–12 months follow-up (OR = 0.49, 95%CI: 0.29–0.80, p = .005). Conclusion Iodoform-based filling materials showed better clinical and radiographic performance when compared to non-iodoform-based filling materials in the short term, and similar performance in the long term. However, most of the studies exhibited unclear or high risk of bias and the overall certainty of the evidence ranged from low to very low. Therefore, new randomized clinical trials must be accomplished to corroborate this conclusion.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"9 1","pages":"52 - 74"},"PeriodicalIF":0.0,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42244847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of «universal» bonding agents for composite repair","authors":"F. Staxrud, H. Valen","doi":"10.1080/26415275.2022.2073234","DOIUrl":"https://doi.org/10.1080/26415275.2022.2073234","url":null,"abstract":"Abstract Aim The aim of this in vitro study was to compare nine different bonding agents of so-called universal type with one well-recognized, 3-step etch-and-rinse bonding agent, as control, in a composite-to-composite shear bond strength (SBS) test. Materials and methods Cylindrical composite substrates were made according to manufacturers’ specifications and potted in epoxy according to the description in ISO TS 29022:2003. They were stored in water (37 °C) for 2 months (for water sorption). New composite was bonded to the substrates using nine different bonding agents of universal type, and one 3-step etch-and-rinse bonding agent as control. Fifteen specimens were made for each bonding agent as required by ISO 29022. SBS testing was performed as described in the standard. Vertical load was applied at the speed of 1 mm/min, using a universal testing machine. Two test series were performed: (A) Short term test of SBS after 2 weeks (B) Long term test of SBS after 1-year storage of specimens in water at 37 °C. Results Test results for the short term test (A); composite-to-composite SBS mean values ranged from 12.0 to 24.9 MPa, and for the long term test (B), SBS ranged from 11.4 to 25 MPa. Six universal bonding agents showed significantly higher bond strength than control in 1-year test. Conclusion In this in vitro study, testing shear bond strength of composite-to-composite bonding, the universal bonding agents performed similar and for some agents better than the 3-step etch-and-rinse bonding agent. New simplified bonding procedures seem reliable for repair of composite.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"9 1","pages":"41 - 46"},"PeriodicalIF":0.0,"publicationDate":"2022-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47106295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical-chemical characterization and bond strength to zirconia of dental adhesives with different monomer mixtures and photoinitiator systems light-activated with poly and monowave devices","authors":"Constantino Fernandes Neto, M. Narimatsu, P. Magão, Reginaldo Mendonça da Costa, C. Pfeifer, A. Furuse","doi":"10.1080/26415275.2022.2064289","DOIUrl":"https://doi.org/10.1080/26415275.2022.2064289","url":null,"abstract":"Abstract Introduction: Bonding to crystalline zirconia is currently a challenge. Properly cured adhesives are crucial to optimize this bond, and that in turn is influenced by the initial mobility of the system, as well as by the reactivity of the initiators. Aim: This study aimed to characterize adhesives containing monomer mixtures of different viscosities and double and triple photoinitiator systems; and to evaluate the bonding to Y-TZP zirconia, when adhesives were light-activated with monowave or polywave light-curing units (LCU). Materials and methods: Adhesives were formulated at a 1:1 weight proportion of Bis-GMA/TEGDMA or Bis-GMA/Bis-EMA. To these mixtures 0.5 wt% of CQ, 0.5–1.0 wt% of DABE, 0.5–1.0 wt% of DPIHP, or 0.5–1.0 wt% of TAS-Sb were added and used as photoinitiator systems. A total of ten adhesives were prepared. Resin composite cylinders were cemented on zirconia slices and 6000 thermal cycles were performed. Degree of conversion (DC), sorption (SO) and solubility (SL) after 7 days of water storage, and microshear bond strength (µSBS) were evaluated. Data were analyzed with three-way ANOVA and Tukey’s HSD (α = 0.05). Results: Bis-GMA/Bis-EMA combined with either CQ/DABE or CQ/DABE/TAS-Sb presented the highest DC, and no significant differences were observed for LCUs (p = .298). CQ/DABE < CQ/DABE/TAS-Sb ≈ CQ/DABE/DPIHP and the polywave LCU showed smaller overall SO (p < .05). Bis-GMA/TEGDMA with CQ/DABE cured with the polywave LCU presented the lowest SO. SL varied as follows: CQ/DABE/TAS-Sb < CQ/DABE/DPIHP < CQ/DABE (p < .001). For µSBS, only the factor photoinitiator system was significant (p = .045). All mean values were above 30 MPa, with higher values being observed for BIS-GMA/TEGDMA and CQ/DABE. Conclusion: It can be concluded that the adhesive containing CQ/DABE/TAS-Sb as coinitiator of Bis-GMA/Bis-EMA mixtures produced a material with higher DC and lower SL, while bond strength values were similar to the ones obtained by CQ/DABE.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"9 1","pages":"20 - 32"},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47926376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear bond strength of resin bonded zirconia and lithium disilicate - effect of surface treatment of ceramics and dentin.","authors":"Mina Aker Sagen,&nbsp;Linda Vos,&nbsp;Jon E Dahl,&nbsp;Hans J Rønold","doi":"10.1080/26415275.2022.2038177","DOIUrl":"https://doi.org/10.1080/26415275.2022.2038177","url":null,"abstract":"<p><p><b>Objectives:</b>The purpose of the study was to investigate the effect of ceramic surface pretreatment, effect of resin cement and dentin surface roughness on shear bond strength. <b>Methodology:</b> Zirconia rods (<i>n</i> = 140) were randomly assigned to air born particle abrasion with aluminum oxide (Al₂O₃) or hot etching with potassium hydrogen difluoride (KHF₂). Lithium disilicate rods (LDS; <i>n</i> = 50) etched with hydrofluoric acid served as reference material. In Part 1 of the study, ceramic rods were cemented to bovine dentin using 5 dual-polymerizing resin cements (Variolink Esthetic, Multilink Automix (Ivoclar Vivadent), Duo-Link (BISCO Dental), Panavia F2.0 (Kuraray Dental), RelyX Unicem (3 M)). Shear bond strength was tested and fracture morphology determined. In Part 2 of the study, test groups with the highest frequency of adhesive fractures between cement and dentin were selected for further bond strength testing with different surface roughness of dentin; ground with P1200 or P80 silicon carbide paper. Dentin samples were fractured vertically to the cemented surface and the adherence between cement and dentin was studied. <b>Results:</b> The results of Part 1 showed that hot etching of zirconia significantly improved bond strength to Duo-Link cement. In Part 2, RelyX Unicem showed significantly higher bond strength to P1200 compared to P80 ground dentin. For Variolink Esthetic, bond strengths to P1200 and P80 ground dentin were similar. Adhesive fracture between cement and dentin dominated. <b>Conclusions:</b> A smooth dentin surface (P1200) improved bond strength to RelyX Unicem. Surface roughness was not important for Variolink Esthetic.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":" ","pages":"10-19"},"PeriodicalIF":0.0,"publicationDate":"2022-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8856076/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39940718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative evaluation of microleakage and dentin shear bond strength of three restorative materials.","authors":"Alpana Kumari,&nbsp;Namita Singh","doi":"10.1080/26415275.2022.2033623","DOIUrl":"https://doi.org/10.1080/26415275.2022.2033623","url":null,"abstract":"<p><strong>Aim: </strong>To evaluate the microleakage and dentin shear bond strength of two glass containing restorative materials, Zirconomer and Cention N, and to compare them with a conventional glass ionomer cement (GIC) (GC Fuji II).</p><p><strong>Materials and methods: </strong>Zirconomer (Shofu) and GC Fuji II (GC Corp.) are self-curing GICs whereas Cention N (IvoclarVivadent) also offers a self-curing option as well as the option of light-curing using an adhesive. For evaluating microleakage, standardized class V cavities were prepared on the buccal surface of 30 premolars. The cavities were restored with one of the three restorative materials (<i>n</i> = 10) according to manufacturers' instructions, Cention N being used with an adhesive (Te-EconomBond, IvoclarVivadent) and in the light-curing mode. After restoration and thermocycling, the microleakage assessment was made under a stereomicroscope at 40x magnification following immersing of the teeth in 0.5% methylene blue dye and buccolingual sectioning. For evaluating dentin shear bond strength, the occlusal surface of the 30 premolars was ground flat, and cylinders of the three restorative materials (<i>n</i> = 10) were bonded to the occlusal surface according to manufacturers' instructions, Cention N being used with an adhesive (Te-EconomBond, IvoclarVivadent) and in the light-curing mode. Following 24-h storage at 100% humidity, the dentin shear bond strength was measured and the fracture mode was determined under a stereomicroscope at 10× magnification. Data were statistically analyzed using Mann-Whitney and Scheffé tests (<i>p</i> = .05).</p><p><strong>Results: </strong>Cention N displayed significantly less microleakage than did Zirconomer and GC Fuji II at occlusal as well as the gingival margins. Dentin shear bond strength varied significantly between 5.15 and 9.89 MPa with Cention N showing the highest bond strength and GC Fuji II the lowest.</p><p><strong>Conclusion: </strong>In this <i>in vitro</i> evaluation, Cention N consistently performed better than the conventional GIC (GC Fuji II) as well as Zirconomer.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":" ","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8843194/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39638547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}