Dental Materials最新文献

{"title":"Dielectric probing of low-temperature degradation resistance of commercial zirconia bio-ceramics","authors":"Bowen Wang ,&nbsp;Rawan Saad Alazwari ,&nbsp;Shafique Ahmed ,&nbsp;Zimeng Hu ,&nbsp;Mike J. Cattell ,&nbsp;Haixue Yan","doi":"10.1016/j.dental.2024.04.008","DOIUrl":"10.1016/j.dental.2024.04.008","url":null,"abstract":"<div><h3>Objectives</h3><p>To investigate the effect of the stability of oxygen vacancies on the low-temperature degradation (LTD) resistance of two kinds of commercial zirconia-based materials (3Y-TZP ceramics and Ce-TZP/Al₂O₃ composites) via the dielectric probing methods.</p></div><div><h3>Methods</h3><p>The commercial 3Y-TZP ceramics and Ce-TZP/Al₂O₃ composites were prepared via conventional solid-state methods. Density, phase content, microstructure, strain, and biaxial flexural strength (BFS) of two materials were investigated using Archimedes method, XRD, SEM, strain-electric field (S-E) loops and ball-on-ring methods, respectively. The concentration of oxygen vacancies before and after LTD of two materials were evaluated using dielectric probing and XPS methods.</p></div><div><h3>Results</h3><p>The XRD analysis revealed that compared to the 3Y-TZP ceramics, the Ce-TZP/Al₂O₃ composites showed better LTD resistance, without clear LTD. The greater LTD resistance for Ce-TZP/Al₂O₃ composites was associated with their stability of oxygen vacancies, by higher activation energy based on the dielectric measurements and XPS results. For the 3Y-TZP ceramics that underwent the tetragonal to the monoclinic phase transition during the LTD treatment, the concentration of their oxygen vacancies decreased after LTD. In addition, the Ce-TZP/Al₂O₃ composites exhibited higher flexural strength and potential fracture toughness based on the BFS testing and strain vs electric field measurement results, indicating a great potential for use in fixed restorative dental applications.</p></div><div><h3>Significance</h3><p>This work suggested the stability of oxygen vacancies played a key role in the resistance to LTD. Optimizing the stability of the oxygen vacancies is key to the development of more reliable zirconia- based dental biomaterials with greater resistance to LTD.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0109564124000897/pdfft?md5=5c028fc38948556d04ee3b05b3914d80&pid=1-s2.0-S0109564124000897-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140890843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of polymerisation protocols on water sorption, solubility and hygroscopic expansion of fast-cure bulk-fill composite","authors":"Halah Thanoon ,&nbsp;Nikolaos Silikas ,&nbsp;David C. Watts","doi":"10.1016/j.dental.2024.04.010","DOIUrl":"10.1016/j.dental.2024.04.010","url":null,"abstract":"<div><h3>Objective</h3><p>This study examines the effect of two <em>light-curing</em> protocols from a LED polywave light curing unit (LCU) on water sorption, solubility, and hygroscopic expansion of <em>fast</em> and <em>conventional</em> bulk-fill resin-based composites (RBCs) aged in distilled water for 120 d.</p></div><div><h3>Methods</h3><p>Three bulk-fill RBCs materials were studied: Tetric PowerFill® (<em>fast</em> photo-polymerised composite) (<strong>TPF</strong>), Tetric EvoCeram bulk-fill (<strong>EVO</strong>), and GrandioSo x-tra bulk-fill (<strong>GSO</strong>) (<em>conventiona</em>l photo-polymerised composites). Specimens were prepared within a 3D-printed resin mold (8-mm diameter x 4-mm height) and light-cured from one side only with 2 modes of polywave LCU (Bluephase® PowerCure): 3 s mode and for 20 s in “Standard” mode. Water sorption and solubility were measured at fixed time intervals for 120 d of distilled water storage, then reconditioned to dry to measure desorption for 75 d, all at 37 ± 1 °C. Hygroscopic (volumetric) expansion was recorded at the same time intervals up to 120 d. Data were analysed through SPSS using Two-way ANOVA, One-way ANOVA, independent t-tests, and Tukey’s <em>post-hoc</em> correction tests (p &lt; 0.05).</p></div><div><h3>Results</h3><p>TPF, when irradiated for 3 s demonstrated minimal water sorption (0.83%), solubility (1.01 μg/mm³), and least volumetric expansion (1.64%) compared to EVO and GSO. While EVO showed the highest water sorption (1.03%) and solubility (1.95 μg/mm³) at 3 s. GSO had the lowest sorption (0.67%) and (0.56%) in 3 s and 20 s protocols, respectively. Nevertheless, all the sorption and solubility data were within the ISO 4049 limits.</p></div><div><h3>Significance</h3><p>For TPF, fast (3 s) polymerisation did not increase either water sorption or solubility, compared with 20 s irradiation. However, with the two comparative bulk-fill composites, fast cure increased water sorption by 15–25% and more than doubled solubility. These findings were consistent with the lesser volumetric expansions observed for Tetric PowerFill at both the fast and standard protocols, indicating its relative stability across polymerisation protocols.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S010956412400085X/pdfft?md5=305c6ecb723518d9ff6faddd8c14caa2&pid=1-s2.0-S010956412400085X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140907772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photopolymerizable semi-crystalline polymers for thermally reversible, 3D printable cast molds","authors":"Rachel Becker ,&nbsp;Alexa S. Kuenstler ,&nbsp;Christopher N. Bowman","doi":"10.1016/j.dental.2024.05.009","DOIUrl":"10.1016/j.dental.2024.05.009","url":null,"abstract":"<div><h3>Objectives</h3><p>This study demonstrates the use of photopolymerization to create semi-crystalline linear polymers suitable for thermally reversible materials in dental cast moldings produced from 3D printing.</p></div><div><h3>Methods</h3><p>An aromatic diallyl, aliphatic dithiol chain extender, and monofunctional thiol were used in a photoinitiated system. The photopolymerization and crystallization kinetics as a function of chemistry and temperature were investigated using spectroscopy and calorimetry. These insights were used to realize vat photopolymerization-based 3D printing of functional objects that could be remotely melted and thereby removed using induction heating.</p></div><div><h3>Results</h3><p>The addition of monothiol was shown to decrease the polymer molecular weight which correspondingly increased the crystallization rate. Photopolymerization kinetics are independent of temperature while crystallization was slowed as the temperature approaches the melting point of the materials. Through inclusion of chromium oxide, semicrystalline materials could be melted through induction heating. These materials were implemented in vat photopolymerization 3D printing to realize high-resolution objects that could be used as releasable dental molds following printing and induction heating.</p></div><div><h3>Significance</h3><p>This work demonstrates a proof-of-concept methodology to realize directly printable, thermally reversible semicrystalline materials for potential use as dental molding materials.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140903848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Post-failure analysis of model resin-composite restorations subjected to different chemomechanical challenges","authors":"Saba Tohidkhah ,&nbsp;Jiacheng Jin ,&nbsp;Anqi Zhang ,&nbsp;Wondwosen Aregawi ,&nbsp;Reza Morvaridi-Farimani ,&nbsp;Edward E. Daisey ,&nbsp;Lin Zhang ,&nbsp;Alex S.L. Fok","doi":"10.1016/j.dental.2024.04.005","DOIUrl":"10.1016/j.dental.2024.04.005","url":null,"abstract":"<div><h3>Objective</h3><p>The current study aimed to evaluate the effects of different combinations of chemical and mechanical challenges on the failure load, failure mode and composition of the resulting fracture surfaces of resin-composite restorations.</p></div><div><h3>Methods</h3><p>Three resin composites were used to fill dentin disks (2 mm inner diameter, 5 mm outer diameter, and 2 mm thick) made from bovine incisor roots. The model restorations, half of which were preconditioned with a low-pH buffer (48 h under pH 4.5), were subjected to diametral compression with either a monotonically increasing load (fast fracture) or a cyclic load with a continuously increasing amplitude (accelerated fatigue). The load or number of cycles to failure was noted. SEM was performed on the fracture surfaces to determine the proportions of dentin, adhesive, and resin composite.</p></div><div><h3>Results</h3><p>Both cyclic fatigue and acid preconditioning significantly reduced the failure load and increased the proportion of interfacial failure in almost all the cases, with cyclic fatigue having a more pronounced effect. Cyclic fatigue also increased the amount of adhesive/hybrid layer present on the fracture surfaces, but the effect of acid preconditioning on the composition of the fracture surfaces varied among the resin composites.</p></div><div><h3>Significance</h3><p>The adhesive or hybrid layer was found to be the least resistant against the chemomechanical challenges among the components forming the model restoration. Increasing such resistance of the tooth-restoration interface, or its ability to combat the bacterial actions that lead to secondary caries following interfacial debonding, can enhance the longevity of resin-composite restorations.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140846357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cytotoxicity effects and differentiation potential of ormocer-based and nanohybrid composite resins on human dental pulp stem cells","authors":"C. Del Giudice ,&nbsp;C. Rengo ,&nbsp;M. Maglitto ,&nbsp;N.G. Armogida ,&nbsp;F. Iaculli ,&nbsp;S. Rengo ,&nbsp;C. Menale ,&nbsp;G. Spagnuolo","doi":"10.1016/j.dental.2024.05.011","DOIUrl":"10.1016/j.dental.2024.05.011","url":null,"abstract":"<div><h3>Objective</h3><p>to compare conventional nanohybrid (Ceram.x Spectra) and ormocer-based (Admira fusion) dental composite resins effects on human dental pulp stem cells (hDPSCs) in terms of cytotoxicity, self-renewal, migration and osteogenic differentiation.</p></div><div><h3>Methods</h3><p>hDPSCs were cultured in presence of different dilutions (undiluted, form 1:2 to 1:100) of CeramX (CX) and Admira fusion (AD) eluates and viability assay in standard or osteogenic conditions were performed. Samples and eluates were prepared according to ISO 10993–12. In addition, apoptosis, self-renewal and migration activity evaluations were carried out. Osteogenic differentiation potential was tested by Alkaline Phosphatase Activity, alizarin red staining and gene expression of specific markers (ALP, RUNX2, OCN, OPN and COL1α1). Statistical analysis was performed by means of a One-way analysis of variance (One-way ANOVA) followed by a Tukey’s test for multiple comparison; results were presented as mean ± standard error of mean (SEM).</p></div><div><h3>Results</h3><p>Admira Fusion demonstrated to be highly biocompatible and showed positive effects on hDPSCs proliferation and differentiation; on the contrary, conventional nanohybrid composite showed to be more cytotoxic and without any notable effect on stem cells differentiation. Moreover, the obtained results were further corroborated by a significant upregulation of osteogenic differentiation markers obtained in presence of ormocer-based composite resin eluate. Specifically, in AD 1:50 group expression levels of ALP, Runx2, Col1α1 were double than control (ALP, p = 0.045; Runx2, p = 0.003; Col1α1, p = 0.001) and CX 1:50 (ALP, p = 0.006; RUNX2, p = 0.029; Col1α1, p = 0.005). Moreover, in the same group, OPN and OCN resulted about 5 times more expressed as compared to control (OPN, p = 0.009; OCN, p = 0.0005) and CX 1:50 (OPN, p = 0.012; OCN, p = 0.0006).</p></div><div><h3>Significance</h3><p>The less cytotoxicity obtained by AD than conventional nanohybrid composite may be attributed to a reduced monomers release in the oral environment, supporting the hypothesis of limited adverse effect and enhanced healing potential, mainly when the material is positioned in close contact with pulp tissue.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S010956412400109X/pdfft?md5=cdaae711a605c8143c0a6c6131da08ae&pid=1-s2.0-S010956412400109X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140896646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of polymerizable betulin maleic diester derivative for dental restorative resins with antibacterial activity","authors":"Zhiyuan Ma,&nbsp;Yifan Chen,&nbsp;Ruili Wang ,&nbsp;Meifang Zhu","doi":"10.1016/j.dental.2024.04.007","DOIUrl":"10.1016/j.dental.2024.04.007","url":null,"abstract":"<div><h3>Objective</h3><p>Bisphenol A glycidyl methacrylate (Bis-GMA) is of great importance for dental materials as the preferred monomer. However, the presence of bisphenol-A (BPA) core in Bis-GMA structure causes potential concerns since it is associated with endocrine diseases, developmental abnormalities, and cancer lesions. Therefore, it is desirable to develop an alternative replacement for Bis-GMA and explore the intrinsic relationship between monomer structure and resin properties.</p></div><div><h3>Methods</h3><p>Here, the betulin maleic diester derivative (MABet) was synthesized by a facile esterification reaction using plant-derived betulin and maleic anhydride as raw materials. Its chemical structure was confirmed by ¹H and ¹³C NMR spectra, FT-IR spectra, and HR-MS, respectively. The as-synthesized MABet was then used as polymerizable comonomer to partially or completely substitute Bis-GMA in a 50:50 Bis-GMA: TEGDMA resin (5B5T) to formulate dental restorative resins. These were then determined for the viscosity behavior, light transmittance, real-time degree of conversion, residual monomers, mechanical performance, cytotoxicity, and antibacterial activity against <em>Streptococcus mutans</em> (<em>S. mutans</em>) in detail.</p></div><div><h3>Results</h3><p>Among all experimental resins, increasing the MABet concentration to 50 wt% made the resultant 5MABet5T resin have a maximum in viscosity and appear dark yellowish after polymerization. In contrast, the 1MABet4B5T resin with 10 wt% MABet possessed comparable shear viscosity and polymerization conversion (46.6 ± 1.0% in 60 s), higher flexural and compressive strength (89.7 ± 7.8 MPa; 345.5 ± 14.4 MPa) to those of the 5B5T control (48.5 ± 0.6%; 65.7 ± 6.7 MPa; 223.8 ± 57.1 MPa). This optimal resin also had significantly lower <em>S. mutans</em> colony counts (0.35 ×10⁸ CFU/mL) than 5B5T (7.6 ×10⁸ CFU/mL) without affecting cytocompatibility.</p></div><div><h3>Significance</h3><p>Introducing plant-derived polymerizable MABet monomer into dental restorative resins is an effective strategy for producing antibacterial dental materials with superior physicochemical property.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140890845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of curing mode of resin composite cements on water sorption, color stability, and biaxial flexural strength","authors":"Svenja M. Benkeser,&nbsp;Sabrina Karlin,&nbsp;Nadja Rohr","doi":"10.1016/j.dental.2024.04.004","DOIUrl":"10.1016/j.dental.2024.04.004","url":null,"abstract":"<div><h3>Objectives</h3><p>To determine whether water sorption and solubility of a recently introduced self-adhesive cement is comparable to two clinically tested resin composite cements after thermal aging, and if this is affected by the curing mode. Whether water sorption is correlated with color difference and biaxial flexural strength was also investigated.</p></div><div><h3>Methods</h3><p>Water sorption and solubility of three resin composite cements {RelyX Universal (RUV), (Panavia V5 (PV5), Panavia SA plus (PSA)} were measured after thermal aging. Disk-shaped specimens were either light-cured or autopolymerized (n = 15 per group). Color difference ΔE₀₀ and biaxial flexural strength were also obtained.</p></div><div><h3>Results</h3><p>Sorption was highest for RUV (auto: 54.9 ± 9.0 µg/mm³, light: 49.7 ± 4.9 µg/mm³), followed by PSA (auto: 37.7 ± 1.4 µg/mm³, light: 34.5 ± 1.1 µg/mm³) and PV5 (auto: 21.7 ± 0.7 µg/mm³, light: 22.1 ± 0.4 µg/mm³). Light-curing reduced solubility values, particularly for RUV (from 60.7 ± 20.8 µg/mm³ to 6.4 ± 0.8 µg/mm³). Color differences of ΔE₀₀ &gt; 1.8 (considered clinically not acceptable) were noted after aging for RUV and PSA. Sorption and ΔE₀₀ values after aging were correlated linearly (R² = 0.970). Biaxial flexural strength values were highest for PV5 (light: 153.4 ± 15.9 MPa; auto: 133.2 ± 18.0 MPa) and lowest for RUV (light: 99.3 ± 12.8 MPa; auto: 35.1 ± 8.3 MPa).</p></div><div><h3>Significance</h3><p>Light-curing has beneficial effects on sorption, color stability, and biaxial flexural strength of resin composite cements. Cements containing 2-hydroxymethacrylate such as RUV and PSA are more prone to water sorption and color changes.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0109564124000836/pdfft?md5=cdd172fc681356803c75dff9c321330a&pid=1-s2.0-S0109564124000836-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140849002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bond strength and marginal adaptation of resin composites and correlations with clinical results","authors":"A. Peutzfeldt ,&nbsp;T. Hug ,&nbsp;R.J. Wierichs","doi":"10.1016/j.dental.2024.05.004","DOIUrl":"10.1016/j.dental.2024.05.004","url":null,"abstract":"<div><h3>Objectives</h3><p>Due to innumerable confounding factors and a high number of types and brands of dental restorative materials, the clinical performance of restorative materials are sought predicted by various in vitro tests. However, only few such tests have been found to correlate well with clinical findings. Thus, the present study determined the in vitro dentin bond strength and marginal adaptation of Class II restorations and correlated the results to their clinical outcomes.</p></div><div><h3>Methods</h3><p>Dentin bond strength (µTBS and µSBS) and marginal gap formation of Class II restorations (replica technique and SEM) were measured after 24 h and 6 m water storage using eight combinations of adhesive and resin composite. Clinical outcomes (mean survival time, Hazard Ratio, annual failure rate; n = 10.695) were gained from a data set of a retrospective multicenter study of direct restorations.</p></div><div><h3>Results</h3><p>Significant differences were found for dentin bond strength and marginal gap formation between the restorative material groups, and negative effects of long-term storage were observed. µTBS correlated significantly with certain clinical outcomes of Class I restorations, while µSBS correlated with certain clinical outcomes of Class II, III, IV and V restorations. Marginal gap formation in enamel and number of paramarginal fractures correlated with certain clinical outcomes of Class II restorations.</p></div><div><h3>Significance</h3><p>Using the same restorative materials in vitro as in vivo, gave significant, but weak correlations between in vitro bond strength or marginal adaptation and clinical outcomes, lending support to the use of in vitro tests in early stages of material selection.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0109564124001064/pdfft?md5=c7120a9057f9773545fa88a475818bfe&pid=1-s2.0-S0109564124001064-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140896669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Do strength of zirconia-abutment-interfaces depend on cement, zirconia type and titanium abutment dimensions?","authors":"Zumreta Alic ,&nbsp;Tom Vaskovich ,&nbsp;Alexander Franz ,&nbsp;Stefan Lettner ,&nbsp;Andreas Moritz ,&nbsp;David C. Watts ,&nbsp;Andreas Schedle","doi":"10.1016/j.dental.2024.04.003","DOIUrl":"10.1016/j.dental.2024.04.003","url":null,"abstract":"<div><h3>Objectives</h3><p>Part 1 of this study investigates the influence of zirconia types, chimney heights, and gingival heights on the strength of the zirconia-abutment-interface. Part 2 extends the analysis to include adhesive brands and macro-retentions.</p></div><div><h3>Methods</h3><p>In Part 1, the study utilized three zirconia types (700 MPa, 1000 MPa, 1200 MPa) to fabricate 234 screw-retained zirconia crowns with varying chimney heights (3.5 mm, 4.1 mm, 5 mm) and gingival heights (0.65 mm, 1.2 mm, 3 mm) of the titanium abutments. All adherend surfaces underwent sandblasting with aluminum oxide before cementation with a specific resin cement. In Part 2, the investigation of 240 screw-retained zirconia crowns focused on a single zirconia type (1000 MPa) with chimney heights of 3.5 mm and 5 mm and a gingival height of 0.65 mm of the titanium abutments, cemented with three different resin cements. All adherent surfaces underwent sandblasting with aluminum oxide before cementation, whereas 120 out of 240 abutments received additional macro retentions. Storage in water at 37 °C for 24 h preceded the tensile test.</p></div><div><h3>Results</h3><p>The study revealed a substantial impact of chimney height and zirconia type on the bond strength of the zirconia-abutment-interface. Neither adhesive brands nor macro retentions significantly impacted the bond strength. Fracture incidence was significantly influenced by gingival height and zirconia type in part 1, whereas in part 2 smaller chimney heights correlated with a higher fracture incidence.</p></div><div><h3>Significance</h3><p>This study contributes insights into the complex interplay of factors influencing the zirconia-abutment-interface. The results provide a foundation for refining clinical approaches, emphasizing the importance of chimney height and zirconia type in achieving successful anterior gap implant restorations.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0109564124000824/pdfft?md5=751aa22e7623c11baf5bf0fa18dade35&pid=1-s2.0-S0109564124000824-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140907759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TiO2 nanotubes as an antibacterial nanotextured surface for dental implants: Systematic review and meta-analysis","authors":"Marcel F. Kunrath ,&nbsp;Georgia Farina ,&nbsp;Luiza B.S. Sturmer ,&nbsp;Eduardo R. Teixeira","doi":"10.1016/j.dental.2024.04.009","DOIUrl":"10.1016/j.dental.2024.04.009","url":null,"abstract":"<div><h3>Objectives</h3><p>Nanotechnology is constantly advancing in dental science, progressing several features aimed at improving dental implants. An alternative for surface treatment of dental implants is electrochemical anodization, which may generate a nanotubular surface (TiO₂ nanotubes) with antibacterial potential and osteoinductive features. This systematic review and meta-analysis aims to elucidate the possible antibacterial properties of the surface in question compared to the untreated titanium surface.</p></div><div><h3>Sources</h3><p>For that purpose, was performed a systematic search on the bases PubMed, Lilacs, Embase, Web Of Science, Cinahl, and Cochrane Central, as well as, manual searches and gray literature.</p></div><div><h3>Study selection</h3><p>The searches resulted in 742 articles, of which 156 followed for full-text reading. Then, 37 were included in the systematic review and 8 were included in meta-analysis.</p></div><div><h3>Results</h3><p>Fifteen studies revealed significant antibacterial protection using TiO₂ nanotube surfaces, while 15 studies found no statistical difference between control and nanotextured surfaces. Meta-analysis of <em>in vitro</em> studies demonstrated relevant bacterial reduction only for studies investigating <em>Staphylococcus aureus</em> in a period of 6 h. Meta-analysis of <em>in vivo</em> studies revealed three times lower bacterial adhesion and proliferation on TiO₂ nanotube surfaces.</p></div><div><h3>Conclusions</h3><p>TiO₂ nanotube topography as a surface for dental implants in preclinical research has demonstrated a positive relationship with antibacterial properties, nevertheless, factors such as anodization protocols, bacteria strains, and mono-culture methods should be taken into consideration, consequently, further studies are necessary to promote clinical translatability.</p></div>","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0109564124000861/pdfft?md5=7b6e3797d75858e748e35e3044bfe5d3&pid=1-s2.0-S0109564124000861-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140875395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}