Rizk, Marta

[["dc.bibliographiccitation.firstpage","1436"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Journal of Endodontics"],["dc.bibliographiccitation.lastpage","1441"],["dc.bibliographiccitation.volume","44"],["dc.contributor.author","Haupt, Franziska"],["dc.contributor.author","Seidel, Miriam"],["dc.contributor.author","Rizk, Marta"],["dc.contributor.author","Sydow, Hans-Georg"],["dc.contributor.author","Wiegand, Annette"],["dc.contributor.author","Rödig, Tina"],["dc.date.accessioned","2020-05-22T09:39:42Z"],["dc.date.available","2020-05-22T09:39:42Z"],["dc.date.issued","2018"],["dc.description.abstract","Introduction Manufacturers offer single-file instrumentation systems with matching gutta-percha (GP) cones to simplify root canal preparation and obturation. The purpose of this study was to determine whether file diameters and tapers match with corresponding cone diameters and tapers (precision) as well as industry standards (accuracy). Methods Twenty files and corresponding GP cones from each size of F360 (#25, #35, #45, #55 with .04 taper) and Reciproc (#25, #40, #50 with variable tapers) instruments were examined by using optical microscopy (×32) to determine their diameter and taper. Precision was evaluated by using one-way analysis of variance (α = 0.05) with Scheffé post hoc tests and t tests with Bonferroni correction. Accuracy was calculated by subtracting the nominal values from the measured values of all files and GP cones, and mean diameter and taper differences were compared by using one-way analysis of variance (α = 0.05) and Scheffé post hoc test for pairwise comparison. Results For F360, the majority of file and cone diameters were within the tolerance levels, but most of the file diameters were significantly larger than GP cone diameters ( P < .05), but the majority of all measured values were within the tolerance levels. For Reciproc, file and cone diameters at D1 and D3 mostly approached the nominal values. At the coronal end, file diameters #25 and #50 were significantly smaller than cone diameters ( P < .05). For both instrumentation systems, almost all file and cone tapers matched with the preset tolerance ranges. For Reciproc, significant differences between file and GP cone demonstrated either smaller cone or smaller file diameters and tapers, depending on the size. Most of the measured values were within the acceptable range, but diameters at the coronal end exhibited the highest percent difference from the nominal values. Conclusions Despite the call for standardization, variability in diameter and taper dimensions between single-file instrumentation systems and their corresponding GP cones can be expected."],["dc.identifier.doi","10.1016/j.joen.2018.06.005"],["dc.identifier.pmid","30078573"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65710"],["dc.language.iso","en"],["dc.relation.eissn","1878-3554"],["dc.relation.issn","0099-2399"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.title","Diameter and Taper Variability of Single-file Instrumentation Systems and Their Corresponding Gutta-percha Cones"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","3862"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","Nanomaterials"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Kreutz, Marietta"],["dc.contributor.author","Kreutz, Christian"],["dc.contributor.author","Kanzow, Philipp"],["dc.contributor.author","Tauböck, Tobias T."],["dc.contributor.author","Burrer, Phoebe"],["dc.contributor.author","Noll, Christine"],["dc.contributor.author","Bader, Oliver"],["dc.contributor.author","Rohland, Bianca"],["dc.contributor.author","Wiegand, Annette"],["dc.contributor.author","Rizk, Marta"],["dc.date.accessioned","2022-12-01T08:31:45Z"],["dc.date.available","2022-12-01T08:31:45Z"],["dc.date.issued","2022-11-01"],["dc.description.abstract","The aim of the study was to examine the applicability of bioactive and antibacterial nanoparticles to an experimental adhesive. The adhesive (60 wt% BisGMA, 15 wt% TEGDMA, 25 wt% HEMA) was mixed with combinations of 5 wt% methacryl-functionalized polyhedral oligomeric silsesquioxane (MA-POSS) and one kind of bioactive/antibacterial nanoparticles: 1 wt% core-shell silica-silver nanoparticle (SiO2@Ag), 1 wt% bioactive glass with bismuth (BAG-Bi) or 1 wt% calcium phosphate (CAP). Pure adhesive served as control. The physicochemical (degree of conversion (DC), linear shrinkage (LS), shear and complex viscosity, water sorption (WS), sol fraction (SF)), biological (antimicrobial effect) and bioactive (mineral precipitation) properties were investigated. DC and LS remained unchanged. The combination of BAG-Bi/MA-POSS resulted in a significantly increased WS and SF compared to control. In addition, the combination of CAP/MA-POSS slightly increased the shear viscosity of the adhesive. The addition of the nanoparticles did not influence the antimicrobial effects compared to the pure adhesive. Improved mineral inducing capacity could be detected in all nanoparticle combinations. The combination of bioactive and/or antibacterial nanoparticles showed improved mineral inducing capacity, but no antibacterial properties. The material properties were not or only slightly affected."],["dc.identifier.doi","10.3390/nano12213862"],["dc.identifier.pii","nano12213862"],["dc.identifier.pmcid","PMC9694625"],["dc.identifier.pmid","36364638"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/118257"],["dc.identifier.url","https://www.mdpi.com/2079-4991/12/21/3862"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-621"],["dc.relation.eissn","2079-4991"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.rights","CC BY 4.0"],["dc.subject.gro","bioactive nanoparticles"],["dc.subject.gro","antimicrobial nanoparticles"],["dc.subject.gro","dental adhesive"],["dc.subject.gro","POSS"],["dc.subject.gro","SiO2@Ag"],["dc.subject.gro","calcium phosphate"],["dc.subject.gro","bioactive glass"],["dc.title","Effect of Bioactive and Antimicrobial Nanoparticles on Properties and Applicability of Dental Adhesives"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","161"],["dc.bibliographiccitation.journal","International Journal of Adhesion and Adhesives"],["dc.bibliographiccitation.lastpage","167"],["dc.bibliographiccitation.volume","89"],["dc.contributor.author","Zanatta, Rayssa Ferreira"],["dc.contributor.author","Wiegand, Annette"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Borges, Alessandra Bühler"],["dc.contributor.author","Torres, Carlos Rocha Gomes"],["dc.contributor.author","Rizk, Marta"],["dc.date.accessioned","2020-12-10T14:24:28Z"],["dc.date.available","2020-12-10T14:24:28Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1016/j.ijadhadh.2019.01.008"],["dc.identifier.issn","0143-7496"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72262"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Comparison of micro-CT and conventional dye penetration for microleakage assessment after different aging conditions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","243"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Bio-Medical Materials and Engineering"],["dc.bibliographiccitation.lastpage","255"],["dc.bibliographiccitation.volume","32"],["dc.contributor.author","Rivas-Mundiña, Berta"],["dc.contributor.author","Vargas-Osorio, Zulema"],["dc.contributor.author","Yáñez-Vilar, Susana"],["dc.contributor.author","Rizk, Marta"],["dc.contributor.author","Piñeiro, Yolanda"],["dc.contributor.author","Pérez-Sayáns, Mario"],["dc.contributor.author","Rivas, José"],["dc.date.accessioned","2021-09-01T06:38:21Z"],["dc.date.available","2021-09-01T06:38:21Z"],["dc.date.issued","2021"],["dc.description.abstract","BACKGROUND: The intricate structure of natural materials is in correspondence with its highly complex functional behaviour. The health of teeth depends, in a complex way, on a heterogeneous arrangement of soft and hard porous tissues that allow for an adequate flow of minerals and oxygen to provide continuous restoration. Although restorative materials, used in clinics, have been evolving from the silver amalgams to actual inorganic fillers, their structural and textural properties are scarcely biomimetic, hindering the functional recovery of the tissue. OBJECTIVE: The objective of this work is to compare and test the hybrid mesoporous silica-based scaffolds as candidates for dentine restoration applications. METHODS: In this work, we present the development and the physical properties study of biocompatible hybrid mesoporous nanostructured scaffolds with a chemically versatile surface and biosimilar architecture. We test their textural (BET) and dielectric permittivity (ac impedance) properties. RESULTS: These materials, with textural and dielectric properties similar to dentine and large availability for the payload of therapeutic agents, are promising candidates as functional restorative materials, suitable for impedance characterization techniques in dental studies. CONCLUSIONS: Structural, textural, morphological characterization and electrical properties of hybrid mesoporous show a large degree of similarity to natural dentin samples."],["dc.description.abstract","BACKGROUND: The intricate structure of natural materials is in correspondence with its highly complex functional behaviour. The health of teeth depends, in a complex way, on a heterogeneous arrangement of soft and hard porous tissues that allow for an adequate flow of minerals and oxygen to provide continuous restoration. Although restorative materials, used in clinics, have been evolving from the silver amalgams to actual inorganic fillers, their structural and textural properties are scarcely biomimetic, hindering the functional recovery of the tissue. OBJECTIVE: The objective of this work is to compare and test the hybrid mesoporous silica-based scaffolds as candidates for dentine restoration applications. METHODS: In this work, we present the development and the physical properties study of biocompatible hybrid mesoporous nanostructured scaffolds with a chemically versatile surface and biosimilar architecture. We test their textural (BET) and dielectric permittivity (ac impedance) properties. RESULTS: These materials, with textural and dielectric properties similar to dentine and large availability for the payload of therapeutic agents, are promising candidates as functional restorative materials, suitable for impedance characterization techniques in dental studies. CONCLUSIONS: Structural, textural, morphological characterization and electrical properties of hybrid mesoporous show a large degree of similarity to natural dentin samples."],["dc.identifier.doi","10.3233/BME-201118"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/88912"],["dc.notes.intern","DOI-Import GROB-455"],["dc.relation.eissn","1878-3619"],["dc.relation.issn","0959-2989"],["dc.title","Hybrid mesoporous nanostructured scaffolds as dielectric biosimilar restorative materials"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","357"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","International Endodontic Journal"],["dc.bibliographiccitation.lastpage","363"],["dc.bibliographiccitation.volume","51"],["dc.contributor.author","Rödig, T."],["dc.contributor.author","Müller, C."],["dc.contributor.author","Hoch, M."],["dc.contributor.author","Haupt, F."],["dc.contributor.author","Schulz, X."],["dc.contributor.author","Wiegand, A."],["dc.contributor.author","Rizk, M."],["dc.date.accessioned","2020-12-10T18:28:51Z"],["dc.date.available","2020-12-10T18:28:51Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1111/iej.12850"],["dc.identifier.issn","0143-2885"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76429"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation.issn","0143-2885"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.title","Moisture content of root canal dentine affects detection of microcracks using micro-computed tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","343"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Oral Science"],["dc.bibliographiccitation.lastpage","350"],["dc.bibliographiccitation.volume","61"],["dc.contributor.author","Kanzow, Philipp"],["dc.contributor.author","Baxter, Steffi"],["dc.contributor.author","Rizk, Marta"],["dc.contributor.author","Wassmann, Torsten"],["dc.contributor.author","Wiegand, Annette E."],["dc.date.accessioned","2019-07-09T11:51:57Z"],["dc.date.accessioned","2020-05-22T07:22:36Z"],["dc.date.available","2019-07-09T11:51:57Z"],["dc.date.available","2020-05-22T07:22:36Z"],["dc.date.issued","2019-06-18"],["dc.description.abstract","The study aimed to compare the repair bond strength of aged composite and amalgam repaired with resin composite after various mechanical and adhesive surface treatments. Specimens were aged by thermal cycling (10,000 cycles, 5-55°C) and randomly subjected to one of three surface treatments: diamond bur abrasion, aluminum oxide air abrasion, or silica coating. Conventional bonding or a universal adhesive with incorporated silane was applied afterward (each n = 16) and resin composite was attached. In the control groups (each n = 16), resin composite was attached using one of the above adhesives without prior mechanical surface conditioning. After further thermal cycling, the shear bond strength (SBS) and failure modes were assessed. Statistical analyses were performed using ANOVA, Weibull statistics, two sample t-tests, and Chi2-test (P < 0.05). The SBS of the repaired amalgam was significantly lower than that of the composite and mechanical pretreatment significantly increased SBS. The universal adhesive significantly improved the SBS of the repaired amalgam compared to the conventional bonding agent and mechanical pretreatment increased the number of cohesive/mixed failures. Amalgam restorations may be repaired using resin composites, but the resulting SBS is lower than that obtained with composite."],["dc.identifier.doi","10.2334/josnusd.18-0301"],["dc.identifier.pmid","31217385"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16247"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60050"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65687"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","1880-4926"],["dc.relation.issn","1343-4934"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","610"],["dc.subject.gro","amalgam"],["dc.subject.gro","composite"],["dc.subject.gro","dental restoration failure"],["dc.subject.gro","dental restoration repair"],["dc.subject.gro","shear bond strength"],["dc.title","Effectiveness of a universal adhesive for repair bonding to composite and amalgam"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","147803"],["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","117"],["dc.contributor.author","Lungova, M."],["dc.contributor.author","Krutyeva, M."],["dc.contributor.author","Pyckhout-Hintzen, W."],["dc.contributor.author","Wischnewski, A."],["dc.contributor.author","Monkenbusch, M."],["dc.contributor.author","Allgaier, J."],["dc.contributor.author","Ohl, M."],["dc.contributor.author","Sharp, M."],["dc.contributor.author","Richter, D."],["dc.date.accessioned","2020-12-10T18:25:41Z"],["dc.date.available","2020-12-10T18:25:41Z"],["dc.date.issued","2016"],["dc.description.abstract","We have studied the motion of polyhedral oligomeric silsesquioxane (POSS) nanoparticles modified with poly(ethylene glycol) (PEG) arms immersed in PEG matrices of different molecular weight. Employing neutron spin echo spectroscopy in combination with pulsed field gradient (PFG) NMR we found the following. (i) For entangled matrices the center of mass mean square displacement (MSD) of the PEG-POSS particles is subdiffusive following a t(0.56) power law. (ii) The diffusion coefficient as well as the crossover to Fickian diffusion is independent of the matrix molecular weight and takes place as soon as the center of mass has moved a distance corresponding to the particle radius-this holds also for unentangled hosts. (iii) For the entangled matrices Rubinstein's scaling theory is validated; however, the numbers indicate that beyond Rouse friction the entanglement constraints appear to strongly increase the effective friction even on the nanoparticle length scale imposing a caveat on the interpretation of microrheological experiments. (iv) The oligomer decorated PEG-POSS particles exhibit the dynamics of a Gaussian star with an internal viscosity that rises with an increase of the host molecular weight."],["dc.identifier.doi","10.1103/PhysRevLett.117.147803"],["dc.identifier.eissn","1079-7114"],["dc.identifier.isi","000384082500028"],["dc.identifier.issn","0031-9007"],["dc.identifier.pmid","27740797"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75791"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1079-7114"],["dc.relation.issn","0031-9007"],["dc.title","Nanoscale Motion of Soft Nanoparticles in Unentangled and Entangled Polymer Matrices"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4733"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Macromolecules"],["dc.bibliographiccitation.lastpage","4741"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Rizk, M."],["dc.contributor.author","Krutyeva, M."],["dc.contributor.author","Luehmann, N."],["dc.contributor.author","Allgaier, J."],["dc.contributor.author","Radulescu, Aurel"],["dc.contributor.author","Pyckhout-Hintzen, W."],["dc.contributor.author","Wischnewski, A."],["dc.contributor.author","Richter, D."],["dc.date.accessioned","2018-11-07T10:22:31Z"],["dc.date.available","2018-11-07T10:22:31Z"],["dc.date.issued","2017"],["dc.description.abstract","We present a detailed small-angle neutron scattering investigation of mixtures of poly(ethylene oxide) (PEO)/polyhedral oligomeric silsesquioxane (POSS) hybrids, a popular nanofiller, addressing the conformation of the model-grafted nanoparticles as well as their influence on the linear polymer matrix in which they are embedded. The nanofiller has a well-defined graft arm length and is monomolecular. Because of the identical chemical nature of the grafted arm and matrix chains, it can be considered as an ideal athermal mixture. We have introduced a random phase approximation approach with general application possibilities for-Other grafted nanofillers, combining the star-like and particle-like characteristics of the POSS nanofiller. The size of the nanofiller remained unaffected and Gaussian upon mixing with linear Chains of various lengths, and no aggregation of the nanofiller was observed. This turns the POSS-based nanocomposite into an interesting model compound. The mixtures of PEO chains with the octafunctional PEO-POSS nanofiller were found to resemble those of a Micellar system whereas within experimental uncertainty the radius of gyration of the embedding matrix remained basically unaltered despite some tendency toward shrinking."],["dc.description.sponsorship","EU ITN DYNACOP [214627]"],["dc.identifier.doi","10.1021/acs.macromol.7b00336"],["dc.identifier.isi","000404492800016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42294"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","1520-5835"],["dc.relation.issn","0024-9297"],["dc.title","A Small-Angle Neutron Scattering Study of a Soft Model Nanofiller in an Athermal Melt"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Dental Materials"],["dc.contributor.author","Paiva, MF"],["dc.contributor.author","Rizk, M."],["dc.contributor.author","Pessan, JP"],["dc.contributor.author","Kreutz, M."],["dc.contributor.author","Rohland, B."],["dc.contributor.author","Biehl, R."],["dc.contributor.author","Stadler, A."],["dc.contributor.author","Stellbrink, J."],["dc.contributor.author","Wiegand, A."],["dc.date.accessioned","2022-11-01T10:17:46Z"],["dc.date.available","2022-11-01T10:17:46Z"],["dc.date.issued","2022"],["dc.description.sponsorship"," http://dx.doi.org/10.13039/501100013640 Deutsche Morgenländische Gesellschaft"],["dc.identifier.doi","10.1016/j.dental.2022.09.020"],["dc.identifier.pii","S0109564122002846"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/116902"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-605"],["dc.relation.issn","0109-5641"],["dc.rights.uri","https://www.elsevier.com/tdm/userlicense/1.0/"],["dc.title","Material properties and bioactivity of a resin infiltrant functionalized with polyhedral oligomeric silsesquioxanes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","394"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Australian Endodontic Journal"],["dc.bibliographiccitation.lastpage","399"],["dc.bibliographiccitation.volume","45"],["dc.contributor.author","Rödig, Tina"],["dc.contributor.author","Krämer, Juliane"],["dc.contributor.author","Müller, Christine"],["dc.contributor.author","Wiegand, Annette"],["dc.contributor.author","Haupt, Franziska"],["dc.contributor.author","Rizk, Marta"],["dc.date.accessioned","2020-11-05T15:13:42Z"],["dc.date.available","2020-11-05T15:13:42Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1111/aej.v45.3"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68535"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-352.9"],["dc.relation.eissn","1747-4477"],["dc.relation.issn","1329-1947"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.title","Incidence of microcracks after preparation of straight and curved root canals with three different NiTi instrumentation techniques assessed by micro‐ CT"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]