Wiegand, Annette E.

[["dc.bibliographiccitation.firstpage","303"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Clinical Oral Investigations"],["dc.bibliographiccitation.lastpage","310"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Wiegand, Annette"],["dc.contributor.author","Drebenstedt, Steffi"],["dc.contributor.author","Roos, Malgorzata"],["dc.contributor.author","Magalhaes, Ana Carolina"],["dc.contributor.author","Attin, Thomas"],["dc.date.accessioned","2018-11-07T11:08:25Z"],["dc.date.available","2018-11-07T11:08:25Z"],["dc.date.issued","2008"],["dc.description.abstract","The study aimed to quantify the color regression of enamel (E), dentine (D), and combined enamel-dentine (ED) of differently bleached ED specimens over a period of 12 months in vitro. Two ED samples were obtained from the labial surfaces of bovine teeth and prepared to a standardized thickness with the enamel and dentine layer each 1 mm. The ED samples were distributed on four groups (each n=80), in which the different bleaching products were applied on enamel (1, Whitestrips; 2, Illumine 15%; 3, Opalescence Xtra Boost) or dentine surfaces (4, mixture of sodium perborate/distilled water). Eighty ED samples were not bleached (control). Color (L a b ) of ED was assessed at baseline, subsequently after bleaching and at 3, 6, and 12 months of storage after bleaching (each 20 samples/group). E and D samples were prepared by removing the dentine or enamel layer of ED samples to allow for separate color analysis. Bleaching resulted in a significant color change (Delta E) of ED specimens. Within the observation period, Delta L but not Delta b declined to baseline. L values of E and D samples also declined and were not significantly different from control samples after 12 months, while b values did not decrease to baseline. Generally, no differences between the bleaching agents could be observed. Color change of enamel, dentine, and combined ED of in vitro bleached tooth samples is not stable over time with regard to lightness. However, yellowness did not return to baseline within 1 year."],["dc.identifier.doi","10.1007/s00784-008-0195-7"],["dc.identifier.isi","000260539500002"],["dc.identifier.pmid","18369668"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6186"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52776"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1432-6981"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","12-Month color stability of enamel, dentine, and enamel-dentine samples after bleaching"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","78"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Caries Research"],["dc.bibliographiccitation.lastpage","86"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Batista, Graziela Ribeiro"],["dc.contributor.author","Gomes Torres, Carlos Rocha"],["dc.contributor.author","Sener, Beatrice"],["dc.contributor.author","Attin, Thomas"],["dc.contributor.author","Wiegand, Annette"],["dc.date.accessioned","2018-11-07T10:20:47Z"],["dc.date.available","2018-11-07T10:20:47Z"],["dc.date.issued","2016"],["dc.description.abstract","The aim of this study was to evaluate the erosion-preventive effect of different artificial saliva formulations and human saliva in vitro compared to human saliva in situ. In the in vitro experiment, bovine enamel and dentin specimens were stored in artificial saliva (4 different formulations, each n = 20), deionized water (n = 20) or human saliva (n = 6 enamel and dentin specimens/volunteer) for 120 min. In the in situ experiment, each of the 6 enamel and dentin specimens was worn intraorally by 10 volunteers for 120 min. The specimens were then eroded (HCl, pH 2.6, 60 s). Half of the specimens were subjected to microhardness analysis (enamel) and the determination of calcium release into the acid (enamel and dentin), while the other half were again placed in the respective medium or worn intraorally, respectively, for 120 min before a second erosion was performed. Knoop microhardness of enamel and the calcium release of enamel and dentin into the acid were again determined. Statistical analysis was conducted by two-way repeated-measures ANOVA or two-way ANOVA (alpha = 0.05). Enamel microhardness was not significantly different between all test groups after the first and the second erosive challenge, respectively. Enamel calcium loss was significantly lower in situ compared to the in vitro experiment, where there was no significant difference between all test groups. Dentin calcium loss was significantly lower than deionized water only after the first and than all except one artificial saliva after the second erosion. Under the conditions of this experiment, the use of artificial saliva formulations and human saliva in vitro does not reflect the intraoral situation in dental erosion experiments adequately. (C) 2016 S. Karger AG, Basel"],["dc.description.sponsorship","CAPES Foundation, Ministry of Education of Brazil [BEX 10470/12-3]"],["dc.identifier.doi","10.1159/000443188"],["dc.identifier.isi","000371792900010"],["dc.identifier.pmid","26870948"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41957"],["dc.language.iso","en"],["dc.notes.intern","DeepGreen Import"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","S. Karger AG"],["dc.relation.eissn","1421-976X"],["dc.relation.issn","1421-976X"],["dc.relation.issn","0008-6568"],["dc.rights","https://www.karger.com/Services/SiteLicenses"],["dc.title","Artificial Saliva Formulations versus Human Saliva Pretreatment in Dental Erosion Experiments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","300"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Swiss Dental Journal"],["dc.bibliographiccitation.lastpage","311"],["dc.bibliographiccitation.volume","127"],["dc.contributor.author","Kanzow, Philipp"],["dc.contributor.author","Dieckmann, Phoebe"],["dc.contributor.author","Hausdörfer, Tim"],["dc.contributor.author","Attin, Thomas"],["dc.contributor.author","Wiegand, Annette E."],["dc.contributor.author","Wegehaupt, Florian J."],["dc.date.accessioned","2019-07-10T08:12:05Z"],["dc.date.accessioned","2020-05-22T07:57:10Z"],["dc.date.available","2019-07-10T08:12:05Z"],["dc.date.available","2020-05-22T07:57:10Z"],["dc.date.issued","2017"],["dc.description.abstract","The aim of this study was to carry out a representative survey on the implementation of and experience with repairs of single-tooth restorations among dentists in the Canton of Zurich, Switzerland. An anonymous questionnaire was sent to all 1,411 dentists registered in the Canton of Zurich; 38.9% of the delivered questionnaires were returned and 35.3% could be evaluated. The statistical analysis comprised Kendall's rank correlation coefficient (tau), Wilcoxon signed-rank tests, and Kruskal-Wallis tests. The level of significance was set at p≤0.05. Repair restorations are frequently made (composite: 98.5%, ceramic: 88.9%, crowns: 86.5%, metal: 54.6%, amalgam: 51.5%). Main indications for repairs were the partial loss of an existing restoration or of the adjacent dental hard substance, while restoration failures due to secondary caries were repaired to a lesser extent. The decision to repair is largely dependent on the size of the defect (90%), the size of the original restoration (63%), and the material of the failed restoration (84%). Repair restorations are most frequently made with composite following adequate conditioning of the repair surface. A majority of the dentists rate the lifespan of repair restorations as reduced in comparison with newly made restorations. In summary, repairs of defective single-tooth restorations are frequently performed by dentists in the Canton of Zurich, Switzerland, and constitute a well-established treatment procedure."],["dc.identifier.pmid","28480953"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14849"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60860"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65702"],["dc.language.iso","en"],["dc.relation.issn","2296-6498"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.subject.ddc","610"],["dc.subject.gro","Survey"],["dc.subject.gro","Repair Restorations"],["dc.subject.gro","Experience"],["dc.subject.gro","Patient Acceptance"],["dc.subject.gro","Success"],["dc.subject.mesh","Ceramics"],["dc.subject.mesh","Composite Resins"],["dc.subject.mesh","Crowns"],["dc.subject.mesh","Dental Amalgam"],["dc.subject.mesh","Dental Restoration Failure"],["dc.subject.mesh","Dental Restoration Repair"],["dc.subject.mesh","Health Care Surveys"],["dc.subject.mesh","Health Surveys"],["dc.subject.mesh","Metals"],["dc.subject.mesh","Surveys and Questionnaires"],["dc.subject.mesh","Switzerland"],["dc.subject.mesh","Utilization Review"],["dc.title","Repair restorations: Questionnaire survey among dentists in the Canton of Zurich, Switzerland"],["dc.title.translated","Reparaturrestaurationen: Umfrage bei ZahnärztInnen im Kanton Zürich"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","189"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Clinical Oral Investigations"],["dc.bibliographiccitation.lastpage","196"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Attin, Thomas"],["dc.contributor.author","Abouassi, Thaer"],["dc.contributor.author","Becker, Klaus"],["dc.contributor.author","Wiegand, Annette"],["dc.contributor.author","Roos, Malgorzata"],["dc.contributor.author","Attin, Rengin"],["dc.date.accessioned","2018-11-07T11:11:10Z"],["dc.date.available","2018-11-07T11:11:10Z"],["dc.date.issued","2008"],["dc.description.abstract","Aims of the study were (1) to establish a method for quantification of chlorhexidine (CHX) in small volumes and (2) to determine CHX release from differently concentrated CHX-containing preparations, varnishes, and a CHX gel applied on artificial fissures. CHX determination was conducted in a microplate reader using polystyrene wells. The reduced intensity of fluorescence of the microplates was used for CHX quantification. For verification of the technique, intra- and inter-assay coefficients of variation were calculated for graded series of CHX concentrations, and the lower limit of quantification (LLOQ) was determined. Additionally, artificial fissures were prepared in 50 bovine enamel samples, divided into five groups (A-E, n=10) and stored in distilled water (7 days); A: CHX-varnish EC40; B: CHX-varnish Cervitec; C: CHX-gel Chlorhexamed; D: negative control, no CHX application; and E: CXH-diacetate standard (E1, n=5) or CHX-digluconate (E2, n=5) in the solution. The specimens were brushed daily, and CHX in the solution was measured. The method showed intra- and inter-assay coefficients of variation of < 10 and < 20%, respectively; LLOQ was 0.91-1.22 nmol/well. The cumulative CHX release (mean +/- SD) during the 7 days was: EC40 (217.2 +/- 41.8 nmol), CHX-gel (31.3 +/- 8.5 nmol), Cervitec (18.6 +/- 1.7 nmol). Groups A-C revealed a significantly higher CHX release than group D and a continuous CHX-release with the highest increase from day 0 to 7 for EC40 and the lowest for Chlorhexamed. The new method is a reliable tool to quantify CHX in small volumes. Both tested varnishes demonstrate prolonged and higher CHX release from artificial fissures than the CHX-gel tested."],["dc.identifier.doi","10.1007/s00784-007-0166-4"],["dc.identifier.isi","000257919100001"],["dc.identifier.pmid","18057970"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6187"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53368"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1432-6981"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","A new method for chlorhexidine (CHX) determination: CHX release after application of differently concentrated CHX-containing preparations on artificial fissures"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]