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Book ; Online ; Thesis: Biomolecules and material-tissue interactions in regenerative dentistry

Frasheri, Iris [Verfasser]

2023

Author's details	Iris Frasheri
Keywords	Medizin, Gesundheit ; Medicine, Health
Subject code	sg610
Language	English
Publisher	Universitätsbibliothek der Ludwig-Maximilians-Universität
Publishing place	München
Document type	Book ; Online ; Thesis
Database	Digital theses on the web

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Article ; Online: Cytotoxicity of 3D printed resin materials for temporary restorations on human periodontal ligament (PDL-hTERT) cells.

Folwaczny, Matthias / Ahantab, Roya / Kessler, Andreas / Ern, Christina / Frasheri, Iris

Dental materials : official publication of the Academy of Dental Materials

2023 Volume 39, Issue 5, Page(s) 529–537

Abstract: Objectives: Various dental resin materials are available for the fabrication of temporary restorations using modern additive printing methods. Albeit these materials are placed for several months in intimate contact with dental hard and soft tissues, ... ...

Abstract	Objectives: Various dental resin materials are available for the fabrication of temporary restorations using modern additive printing methods. Albeit these materials are placed for several months in intimate contact with dental hard and soft tissues, including the gingival crevice, there exists only insufficient evidence on the biocompatibility of these materials. This in vitro study aimed to delineate the biocompatibility of 3D printable materials on periodontal ligament cells (PDL-hTERTs). Methods: Samples of four dental resin materials for additive fabrication of temporary restorations using 3D printing (MFH, Nextdent; GC Temp, GC; Freeprint temp, Detax; 3Delta temp, Deltamed), one material for subtractive fabrication (Grandio disc, Voco) and one conventional temporary material (Luxatemp, DMG) were prepared with a standardized size according to the manufacturer's instructions. Human PDL-hTERTs were exposed to resin specimens or eluates of the material for 1, 2, 3, 6 and 9 days. For determination of cell viability, XTT assays were performed. In addition, the expression of the proinflammatory cytokines interleukin 6 and 8 (IL-6 and 8) was assessed in the supernatants with ELISA. Cell viability and the expression of IL-6 and 8 in presence of the resin material or their eluates was compared with untreated controls. Immunofluorescence staining for IL-6 and IL-8, as well as scanning electron microscopy of the discs after culturing, were performed. Differences between groups were analyzed with Student´s t-test for unpaired samples. Results: Compared to untreated control samples, the exposure against the resin specimen induced strong reduction of cell viability in case of the conventional material Luxatemp (p < 0.001) and the additive material 3Delta temp (p < 0.001) irrespective of the observation period. On the contrary, the presence of eluates of the various materials induced only minor changes in cell viability. Considering IL-6 (day 2: p = 0.001; day 6 and 9: p < 0.001) and IL-8 (day 1: p = 0.001; day 2, 3, 6, 9: p < 0.001) their expression was strongly reduced in presence of the eluate of Luxatemp. Except for IL-6 at day 1 and 6 also the material 3Delta temp caused significant reduction of both proinflammatory mediators at any time point. Significance: The conventional material Luxatemp and the additive material 3Delta temp appear to severely affect cell viability when in direct contact with PDL-hTERTs. The other tested materials of this new category of additive materials and the subtractive material Grandio seem to induce only minor changes in direct contact with these cells. Therefore, they could serve as a viable alternative in the fabrication of temporary restorations.
MeSH term(s)	Humans ; Interleukin-8 ; Periodontal Ligament ; Interleukin-6 ; Materials Testing ; Printing, Three-Dimensional
Chemical Substances	luxatemp ; Interleukin-8 ; Interleukin-6
Language	English
Publishing date	2023-04-11
Publishing country	England
Document type	Journal Article
ZDB-ID	605995-8
ISSN	1879-0097 ; 0109-5641
ISSN (online)	1879-0097
ISSN	0109-5641
DOI	10.1016/j.dental.2023.04.003
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Article ; Online: Retrospective clinical study on the performance and aesthetic outcome of pressed lithium disilicate restorations in posterior teeth up to 8.3 years.

Lindner, Stefanie / Frasheri, Iris / Hickel, Reinhard / Crispin, Alexander / Kessler, Andreas

Clinical oral investigations

2023 Volume 27, Issue 12, Page(s) 7383–7393

Abstract: Objectives: Evaluation of cumulative survival and complication rate of monolithic lithium disilicate inlays and partial crowns performed by supervised undergraduate students up to 8.3 years of clinical service.: Materials and methods: In this ... ...

Abstract	Objectives: Evaluation of cumulative survival and complication rate of monolithic lithium disilicate inlays and partial crowns performed by supervised undergraduate students up to 8.3 years of clinical service. Materials and methods: In this retrospective clinical study 143 lithium disilicate posterior restorations (IPS e.max Press) were examined according to the FDI criteria. A standardised questionnaire was used to determine patient satisfaction. The aesthetic outcome was evaluated by dentists and dental technicians using intraoral photographs. Data were descriptively analysed. Cumulative survival and success rates were calculated using Kaplan-Meier estimation. Results: The cumulative survival rate of lithium disilicate restorations was 97.5% after a mean service time of 5.9 years and 95.0% after 8.3 years. The cumulative success rate decreased from 94.4% after 5.9 years to 30.7% after 8.3 years. Repairs were required for 7 restorations (4.9%), and 5 (3.5%) were classified as failures. The results of the questionnaire indicate a high level of patient satisfaction. The subjective aesthetics were assessed more critically by dental technicians compared to dentists. Conclusion: Lithium disilicate posterior restorations survived successfully up to 8.3 years when carried out by undergraduate students. Clinical relevance: Pressed lithium disilicate glass ceramic inlays and partial crowns are reliable treatment options in posterior teeth.
MeSH term(s)	Humans ; Crowns ; Retrospective Studies ; Dental Restoration Failure ; Esthetics, Dental ; Dental Porcelain ; Ceramics
Chemical Substances	lithia disilicate ; Dental Porcelain (12001-21-7)
Language	English
Publishing date	2023-10-23
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1364490-7
ISSN	1436-3771 ; 1432-6981
ISSN (online)	1436-3771
ISSN	1432-6981
DOI	10.1007/s00784-023-05328-0
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Article ; Online: The molecular weight of hyaluronic acid influences metabolic activity and osteogenic differentiation of periodontal ligament cells.

Frasheri, Iris / Tsakiridou, Nikoletta Dimitra / Hickel, Reinhard / Folwaczny, Matthias

Clinical oral investigations

2023 Volume 27, Issue 10, Page(s) 5905–5911

Abstract: Objective: While HA is present naturally in periodontal tissues, its molecular weight can vary widely in vivo. The objective of this study was to directly compare the biological reactions of periodontal ligament cells to four distinct molecular weights ... ...

Abstract	Objective: While HA is present naturally in periodontal tissues, its molecular weight can vary widely in vivo. The objective of this study was to directly compare the biological reactions of periodontal ligament cells to four distinct molecular weights of hyaluronic acid (HA). Materials and methods: Immortalized human periodontal ligament cells (PDL-hTERT) were cultured for 21 days in culture medium alone (control) or enriched with osteogenic supplements (OS group). Other 4 experimental groups were cultured in OS medium with the addition of HA with different molecular weights (HMW, MMW, LMW, and ULMW). The cell morphology was examined daily. WST1 assays were performed to evaluate metabolic activity. Von Kossa staining and calcium deposition assay were used to analyze osteogenic differentiation and mineralization. Results: Cell morphology remained unaltered in all groups. Cells stimulated with OS alone or with the addition of hyaluronan showed all the typical microscopic appearance of osteogenic differentiation. Metabolic activity increased in all groups over time. Hyaluronan stimulated greater metabolic activity than the control group, with LMW HA and MMW HA showing the most significant increase. All groups showed mineral deposits and calcium deposition after 21 days of stimulation. Conclusion: Our results suggest that hyaluronan can promote metabolic activity and mineralization of PDL-hTERT cells, with LMW HA being the most effective. Clinical relevance: These results shed light on how the various molecular weight fractions of HA promote tissue regeneration and repair, as well as help to identify an optimal molecular weight range for this application in periodontal tissues.
MeSH term(s)	Humans ; Periodontal Ligament ; Osteogenesis/physiology ; Hyaluronic Acid/pharmacology ; Molecular Weight ; Calcium ; Cell Proliferation ; Cell Differentiation ; Cells, Cultured
Chemical Substances	Hyaluronic Acid (9004-61-9) ; Calcium (SY7Q814VUP)
Language	English
Publishing date	2023-08-17
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1364490-7
ISSN	1436-3771 ; 1432-6981
ISSN (online)	1436-3771
ISSN	1432-6981
DOI	10.1007/s00784-023-05202-z
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Article ; Online: Evaluation of the biological effects of amelogenin on human oral keratinocytes.

Frasheri, Iris / Paschalidou, Maria / Imhof, Thomas / Steinberg, Thorsten / Spinell, Thomas / Hickel, Reinhard / Folwaczny, Matthias

Dental materials : official publication of the Academy of Dental Materials

2023 Volume 39, Issue 10, Page(s) 922–928

Abstract: Objectives: Amelogenins are clinically used in periodontal regeneration as main components of root surface modifying agents, even without specifically preventing the premature colonization of the healing tissue defect by means of a physical barrier ... ...

Abstract	Objectives: Amelogenins are clinically used in periodontal regeneration as main components of root surface modifying agents, even without specifically preventing the premature colonization of the healing tissue defect by means of a physical barrier membrane. The objective of this study was to investigate the effects of human amelogenin on the proliferation, migration, and morphology of Immortalized Human Oral Keratinocytes (iHOKs). Methods: Immortalized Human Oral Keratinocytes were expanded in Keratinocyte Growth Medium-2 (KGM-2). Full-length recombinant amelogenin protein was diluted in KGM-2 in five concentrations (10 ng/ml, 100 ng/ml, 1.000 ng/ml, 5.000 ng/ml and 10.000 ng/ml). iHOKs were cultured in medium supplemented with the amelogenin dilutions. Samples without amelogenin served as control. Cell metabolism and cell proliferation together with cell migration were evaluated at day 7, 14, 21. Results: At day 7, iHOKs treated with 10,000 ng/ml showed a significant decrease in keratinocytes´ proliferation. The metabolic activity at this timepoint was significantly lower for concentrations ≥ 1000 ng/ml. At days 14 and 21, both the addition of 5000 ng/ml and even more 10,000 ng/ml amelogenin reduced significantly the proliferation of keratinocytes. The effects on the metabolic activity for these timepoints were visible already with 100 ng/ml. Treatment of iHOKs with amelogenin of ≥ 1000 ng/ml led to inhibitory effects on cell migration already after 24 h. Conclusions: The full-length recombinant amelogenin has a significant biological impact on iHOKs. The increasing dose dependent inhibitory effects of amelogenin shown on iHOKs might explain the disruption of the apical migration of the junctional epithelium during regenerative healing. Clinical significance: Amelogenin, presents time- and dose-dependent inhibitory effects on the growth of keratinocytes, which might explain the biological rationale behind its application in periodontal regeneration.
MeSH term(s)	Humans ; Amelogenin/pharmacology ; Cell Movement ; Cell Proliferation ; Keratinocytes
Chemical Substances	Amelogenin
Language	English
Publishing date	2023-08-26
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	605995-8
ISSN	1879-0097 ; 0109-5641
ISSN (online)	1879-0097
ISSN	0109-5641
DOI	10.1016/j.dental.2023.08.176
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Article ; Online: Correction to: Ultrastructural changes of smooth and rough titanium implant surfaces induced by metal and plastic periodontal probes.

Folwaczny, Matthias / Rudolf, Torsten / Frasheri, Iris / Betthäuser, Madlena

Clinical oral investigations

2021 Volume 26, Issue 1, Page(s) 1101

Language	English
Publishing date	2021-11-18
Publishing country	Germany
Document type	Published Erratum
ZDB-ID	1364490-7
ISSN	1436-3771 ; 1432-6981
ISSN (online)	1436-3771
ISSN	1432-6981
DOI	10.1007/s00784-021-04216-9
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Article ; Online: Effects of resin materials dedicated for additive manufacturing of temporary dental restorations on human gingival keratinocytes.

Frasheri, Iris / Aumer, Katharina / Keßler, Andreas / Miosge, Nicolai / Folwaczny, Matthias

Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.

2022 Volume 34, Issue 7, Page(s) 1105–1112

Abstract: Objective: This study investigated the effect of eluates of conventional and 3D-printed resin materials for manufacturing temporary dental restorations on gingival keratinocytes.: Methods: Three-dimensional (3D)-printed resin materials: 3Delta temp ( ... ...

Abstract	Objective: This study investigated the effect of eluates of conventional and 3D-printed resin materials for manufacturing temporary dental restorations on gingival keratinocytes. Methods: Three-dimensional (3D)-printed resin materials: 3Delta temp (Deltamed), NextDent MFH (Nextdent), Freeprint temp (Detax), GC temp (GC), were compared to Grandio disc (Voco) and Luxatemp (DMG). Human gingival keratinocytes (IHGKs) were exposed to eluates of the materials and XTT assays were performed at 24 h, 48 h, 72 h, or 144 h. For quantification of the proinflammatory response, the protein amount of IL-6 and 8 was determined in the supernatants using ELISA. One-way ANOVA with post hoc analysis was used to compare differences in cell viability and IL-6 and IL-8 levels between groups. Results: At 24 h, and more remarkably at 48 h, a significant decrease in cell viability occurred for the 3D-printed materials compared to the untreated IHGKs, but also compared to Grandio disc and Luxatemp. Except for the expression of IL-8 in presence of the eluate of Grandio disc at 24 and 48 h, all tested materials caused attenuation of IL-6 and 8 from IHGKs for any observation period. Conclusions: The materials for additive manufacturing affect cell proliferation differently than the subtractive manufactured material Grandio disc and the conventional material Luxatemp. Clinical significance: In comparison to conventional and subtractive manufactured restorations, 3D printed temporary restorations might induce more negative effects on the gingival and probably also on pulpal health since viability and the proinflammatory response of oral keratinocytes are more intensively affected by these materials.
MeSH term(s)	Bisphenol A-Glycidyl Methacrylate ; Dental Materials/pharmacology ; Dental Restoration, Temporary ; Humans ; Interleukin-6 ; Interleukin-8 ; Keratinocytes ; Materials Testing
Chemical Substances	Dental Materials ; Interleukin-6 ; Interleukin-8 ; luxatemp ; Bisphenol A-Glycidyl Methacrylate (454I75YXY0)
Language	English
Publishing date	2022-06-22
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2043146-6
ISSN	1708-8240 ; 1496-4155
ISSN (online)	1708-8240
ISSN	1496-4155
DOI	10.1111/jerd.12938
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Article ; Online: In-vitro cytocompatibility of self-adhesive dual-curing resin cements on human mesenchymal stem cells (hMSC) and periodontal ligament cells (PDL-hTERT).

Frasheri, Iris / Grimm, Alexandra / Ern, Christina / Hickel, Reinhard / Folwaczny, Matthias

Dental materials : official publication of the Academy of Dental Materials

2022 Volume 38, Issue 2, Page(s) 376–383

Abstract: Objectives: Self-adhesive dual cured resin cements provide easier clinical application than conventional resin cements but release higher amounts of unreacted monomers, potentially affecting their biocompatibility. This study aimed to compare the ... ...

Abstract	Objectives: Self-adhesive dual cured resin cements provide easier clinical application than conventional resin cements but release higher amounts of unreacted monomers, potentially affecting their biocompatibility. This study aimed to compare the cytotoxic effects of self-adhesive dual cured resin cements with two conventional resin cements. Methods: Samples of four resin cements, two self-adhesive dual cured cements (group A: RelyX Unicem, group B: SmartCem), and two conventional resin cements (group C: Panavia 2.0, group D: Variolink Esthetic DC) were prepared with a similar dimension under standardized polymerization conditions and stored in water. For each material 18 samples were used and cell cultures of human mesenchymal stem cells (hMSCs) or periodontal ligament cells (PDL-hTERT) were added under appropriate conditions. One experimental group (group E) was left untreated as control. A cell viability WST test, was performed in each experimental group at day 1, 7, 14 and 21. Moreover, microscopic examination of cells was performed using cell viability staining. Results: Viability of both cell types as determined by WST test was significantly impaired at all time periods by the four different cement materials compared to the untreated control. Comparison between the four materials revealed different inhibition of the viability of both, PDL-hTERT and hMSC cells (group C > group B > group A > group D; p < 0.0001). Significance: All resin-based cements caused significant impairment of cell viability, reflecting considerable cytotoxicity. Variolink caused significantly smaller changes of viability than the other tested materials.
MeSH term(s)	Humans ; Materials Testing ; Mesenchymal Stem Cells ; Periodontal Ligament ; Polymerization ; Resin Cements
Chemical Substances	Resin Cements
Language	English
Publishing date	2022-01-05
Publishing country	England
Document type	Journal Article
ZDB-ID	605995-8
ISSN	1879-0097 ; 0109-5641
ISSN (online)	1879-0097
ISSN	0109-5641
DOI	10.1016/j.dental.2021.12.020
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Article ; Online: Ultrastructural changes of smooth and rough titanium implant surfaces induced by metal and plastic periodontal probes.

Folwaczny, Matthias / Rudolf, Torsten / Frasheri, Iris / Betthäuser, Madlena

Clinical oral investigations

2020 Volume 25, Issue 1, Page(s) 105–114

Abstract: Objectives: To determine the ultrastructural changes of titanium surfaces of dental implants induced by the tip of periodontal probes.: Materials and methods: A total of 40 samples of smooth and rough surfaces of titanium implants were randomly ... ...

Abstract	Objectives: To determine the ultrastructural changes of titanium surfaces of dental implants induced by the tip of periodontal probes. Materials and methods: A total of 40 samples of smooth and rough surfaces of titanium implants were randomly assigned for the treatment with metal or plastic periodontal probes under application angles of 20° and 60°. Titanium surfaces have been evaluated with CLSM prior and following to experimental probing determining various standardized 2D and 3D roughness parameters. Results: The average profile and surface roughness (Ra and Sa) showed no significant difference between treated and untreated samples on smooth and rough surface areas irrespective of the probe material. On smooth surfaces several amplitude roughness parameters were increased with metal probes but reached significance only for Rp (p = 0.007). Rough surface parts showed a slight but not significant reduction of roughness following to the contact with metal probes. The surface roughness remained almost unchanged on smooth and rough implant surfaces using plastic probes. The surface roughness on implant surfaces was not dependent on the application angle irrespective of the probe material. Conclusion: Probing of titanium implants with metal probes and even less with plastic probes causes only minor changes of the surface roughness. The clinical significance of these changes remains to be elucidated. Clinical relevance: Using plastic probes for the clinical evaluation of the peri-implant sulcus might avoid ultrastructural changes to titanium implant surfaces.
MeSH term(s)	Dental Implants ; Plastics ; Surface Properties ; Titanium
Chemical Substances	Dental Implants ; Plastics ; Titanium (D1JT611TNE)
Language	English
Publishing date	2020-06-21
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1364490-7
ISSN	1436-3771 ; 1432-6981
ISSN (online)	1436-3771
ISSN	1432-6981
DOI	10.1007/s00784-020-03341-1
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Article ; Online: Longevity of gold restorations in posterior teeth: A retrospective study up to 10-years.

Frasheri, Iris / Hickel, Reinhard / Manhart, Juergen / Diegritz, Christian / Folwaczny, Matthias / Fotiadou, Christina

Journal of dentistry

2022 Volume 124, Page(s) 104235

Abstract: Objective: In this retrospective clinical study, we investigated the long-term survival and success of indirect gold restorations, placed by undergraduate students.: Material and methods: The study included 72 gold restorations in 45 patients, placed ...

Abstract	Objective: In this retrospective clinical study, we investigated the long-term survival and success of indirect gold restorations, placed by undergraduate students. Material and methods: The study included 72 gold restorations in 45 patients, placed in a five-year period between 2009 and 2013. Two experienced dentists performed the evaluation following the FDI criteria after 5 to 10 years. Kaplan-Meier test was used for longevity analysis of success and survival. Data were tested for normality with Shapiro-Wilk test. Cox regression analysis, with significance level appointed at p ≤ .05, was performed using success and survival of restorations as dependent variables. Annual failure rates (AFRs) were calculated. Results: Overall, 72 indirect gold restorations prepared in posterior teeth were assessed, with an observation time from 63 months to 117 months. The mean service time was 88.1 months and the median 87 months. No failures, but 2 repairs, were observed during the first five years. From 5 to 10 years 1 replacement and 1 more repair occurred. The survival and success rates of gold restorations were calculated at 9 years with 98.6% and 91%, respectively. Restorations placed on premolars had higher survival and success rates compared to molars. Three cases were categorized as repairs: in two cases, a root canal treatment was needed and, in one other, an occlusal perforation of the restoration was observed. Conclusions: Posterior indirect gold restorations placed by dental undergraduate students showed a highly predictable clinical performance in terms of success and survival. These results are comparable with survival rates reported in literature for restorations cemented in general dental practices. Clinical significance: Casted gold restorations placed from dental students in an undergraduate setting show high survival rates, similar to professional dentists.
MeSH term(s)	Composite Resins/therapeutic use ; Dental Restoration Failure ; Dental Restoration, Permanent/methods ; Gold ; Humans ; Retrospective Studies
Chemical Substances	Composite Resins ; Gold (7440-57-5)
Language	English
Publishing date	2022-07-21
Publishing country	England
Document type	Journal Article
ZDB-ID	186068-9
ISSN	1879-176X ; 0300-5712
ISSN (online)	1879-176X
ISSN	0300-5712
DOI	10.1016/j.jdent.2022.104235
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