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Magnin A, Iversen VC, Calvo G, Čečetková B, Dale O, Demlova R, Blasko G, Keane F, Kovacs GL, Levy-Marchal C, Monteiro EC, Palmisano L, Pella D, Portolés Pérez A, Rascol O, Schmid C, Tay F, von der Leyen H, Ohmann C. European survey on national training activities in clinical research. Trials 2019; 20:616. [PMID: 31665085 PMCID: PMC6821032 DOI: 10.1186/s13063-019-3702-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 09/04/2019] [Indexed: 11/17/2022] Open
Abstract
Background Investigator-initiated clinical studies (IITs) are crucial to generate reliable evidence that answers questions of day-to-day clinical practice. Many challenges make IITs a complex endeavour, for example, IITs often need to be multinational in order to recruit a sufficient number of patients. Recent studies highlighted that well-trained study personnel are a major factor to conduct such complex IITs successfully. As of today, however, no overview of the European training activities, requirements and career options for clinical study personnel exists. Methods To fill this knowledge gap, a survey was performed in all 11 member and observer countries of the European Clinical Research Infrastructure Network (ECRIN), using a standardised questionnaire. Three rounds of data collection were performed to maximize completeness and comparability of the received answers. The survey aimed to describe the landscape of academic training opportunities, to facilitate the exchange of expertise and experience among countries and to identify new fields of action. Results The survey found that training for Good Clinical Practice (GCP) and investigator training is offered in all but one country. A specific training for study nurses or study coordinators is also either provided or planned in ten out of eleven countries. A majority of countries train in monitoring and clinical pharmacovigilance and offer specific training for principal investigators but only few countries also train operators of clinical research organisations (CRO) or provide training for methodology and quality management systems (QMS). Minimal requirements for study-specific functions cover GCP in ten countries. Only three countries issued no requirements or recommendations regarding the continuous training of study personnel. Yet, only four countries developed a national strategy for training in clinical research and the career options for clinical researchers are still limited in the majority of countries. Conclusions There is a substantial and impressive investment in training and education of clinical research in the individual ECRIN countries. But so far, a systematic approach for (top-down) strategic and overarching considerations and cross-network exchange is missing. Exchange of available curricula and sets of core competencies between countries could be a starting point for improving the situation.
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Affiliation(s)
- A Magnin
- SCTO - Swiss Clinical Trial Organisation, Bern, Switzerland
| | - V Cabral Iversen
- NorCRIN - Norwegian Clinical Research Infrastructures Network, Trondheim, Norway
| | - G Calvo
- SCReN - Spanish Clinical Research Network, Madrid, Spain
| | - B Čečetková
- SLOVACRIN - Slovak Clinical Research Infrastructure Network, Bratislava, Slovakia
| | - O Dale
- NorCRIN - Norwegian Clinical Research Infrastructures Network, Trondheim, Norway
| | - R Demlova
- CZECRIN - Czech Clinical Research Infrastructure Network, Prague, Czech Republic
| | - Gy Blasko
- HECRIN - Hungarian Clinical Research Infrastructure Network, Budapest, Hungary
| | - F Keane
- HRB CRCI - Health Research board, Clinical Research Coordination Ireland, Dublin, Ireland
| | - G L Kovacs
- HECRIN - Hungarian Clinical Research Infrastructure Network, Budapest, Hungary
| | - C Levy-Marchal
- F-CRIN - French Clinical Research Infrastructure Network, Paris, France
| | - E C Monteiro
- PTCRIN - Portuguese Clinical Research Infrastructure Network, Lisboa, Portugal
| | - L Palmisano
- ItaCRIN - Italian Clinical Research Infrastructure Network, Rome, Italy
| | - D Pella
- SLOVACRIN - Slovak Clinical Research Infrastructure Network, Bratislava, Slovakia
| | | | - O Rascol
- F-CRIN - French Clinical Research Infrastructure Network, Paris, France
| | - C Schmid
- SCTO - Swiss Clinical Trial Organisation, Bern, Switzerland
| | - F Tay
- SCTO - Swiss Clinical Trial Organisation, Bern, Switzerland
| | - H von der Leyen
- KKSN - Netzwerk der Koordinierungszentren für Klinische Studien, Hannover, Germany
| | - C Ohmann
- ECRIN - European Clinical Research Infrastructure Network, Kaiserswerther Str, 70 40477, Düsseldorf, Germany.
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Gu L, Cai X, Guo J, Pashley D, Breschi L, Xu H, Wang X, Tay F, Niu L. Chitosan-Based Extrafibrillar Demineralization for Dentin Bonding. J Dent Res 2018; 98:186-193. [DOI: 10.1177/0022034518805419] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Instability of resin-dentin bonds is the Achilles’ heel of adhesive dentistry. To address this problem, a chelate-and-rinse extrafibrillar dentin demineralization strategy has been developed that keeps intrafibrillar minerals within collagen fibrils intact to prevent activation of endogenous proteases that are responsible for collagen degradation within hybrid layers. The objective of the present study was to evaluate the potential of using chitosan >40 kDa as an antimicrobial extrafibrillar dentin-chelating agent to enhance bond durability. Transmission electron microscopy provided evidence for retention of intrafibrillar minerals and smear plugs in dentin conditioned with 1 wt% chitosan. Analyzed by Kruskal-Wallis analysis of variance, Dunn’s statistic, and separate Mann-Whitney tests, tensile bond strengths to wet- and dry-bonded dentin indicated that chelating dentin with chitosan for 60 s prior to bonding did not result in a significant decline in resin-dentin bond strength when compared with that of phosphoric acid etching ( P > 0.05). Gelatinolytic activity within the hybrid layers was examined via in situ zymography after 24-h storage or after thermomechanical cycling and analyzed with 3-factor analysis of variance. After 24 h, enzymatic activity was detected only within completely demineralized phosphoric acid–etched dentin, with values derived from dry bonding significantly higher than those derived from wet bonding ( P < 0.05). Negligible fluorescence was detected within hybrid layers when dentin was conditioned with chitosan, even after thermomechanical cycling, as compared with the controls. Reduction in water permeability in chitosan-conditioned dentin, attributed to smear plug retention, also fostered long-term bond stability. Antibacterial testing performed with live/dead staining indicated that the acetic acid–solubilized chitosan possessed antibacterial activities against 3 single-species biofilms: Streptococcus mutans, Actinomyces naeslundii, and Enterococcus faecalis. Taken together, the new chitosan-based extrafibrillar demineralization strategy retains intrafibrillar minerals, reduces endogenous protease-initiated collagen degradation, prevents water permeation within hybrid layers, and kills bacteria on dentin surfaces, which are crucial factors for enhancing resin-dentin bond durability.
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Affiliation(s)
- L.S. Gu
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology and Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - X. Cai
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing, China
| | - J.M. Guo
- School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - D.H. Pashley
- The Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - L. Breschi
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna, Bologna, Italy
| | - H.H.K. Xu
- Department of Advanced Oral Sciences and Therapeutics, University of Maryland Dental School, Baltimore, MD, USA
| | - X.Y. Wang
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology and Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing, China
| | - F.R. Tay
- The Dental College of Georgia, Augusta University, Augusta, GA, USA
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - L.N. Niu
- The Dental College of Georgia, Augusta University, Augusta, GA, USA
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, China
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Gu L, Mazzoni A, Gou Y, Pucci C, Breschi L, Pashley D, Niu L, Tay F. Zymography of Hybrid Layers Created Using Extrafibrillar Demineralization. J Dent Res 2018; 97:409-415. [PMID: 29294298 DOI: 10.1177/0022034517747264] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- L. Gu
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology & Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - A. Mazzoni
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna–Alma Mater Studiorum, Bologna, Italy
| | - Y. Gou
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - C. Pucci
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University UNESP São Jose dos Campos, São Paulo, Brazil
| | - L. Breschi
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna–Alma Mater Studiorum, Bologna, Italy
| | - D.H. Pashley
- Department of Endodontics, The Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - L. Niu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, Shaanxi, PR China
| | - F.R. Tay
- Department of Endodontics, The Dental College of Georgia, Augusta University, Augusta, GA, USA
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Mazzoni A, Angeloni V, Sartori N, Duarte S, Maravic T, Tjäderhane L, Pashley D, Tay F, Breschi L. Substantivity of Carbodiimide Inhibition on Dentinal Enzyme Activity over Time. J Dent Res 2017; 96:902-908. [DOI: 10.1177/0022034517708312] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The use of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide HCl (EDC) has recently been investigated for its effectiveness in the prevention of collagen degradation over time and the improvement of resin-dentin bond durability. The objective of the present study was to evaluate the effects of a 0.3 M EDC-containing conditioner on endogenous enzymatic activities within the hybrid layer (HL) created by a self-etch or an etch-and-rinse adhesive after 1 y. The activity within the HL was examined using in situ zymography and confocal laser scanning microscopy after 24 h or 1-y storage in artificial saliva. Dentin specimens were bonded with Clearfil SE Bond (CSE) or XP Bond (XPB). For CSE, the self-etching primer was applied and treated with 0.3 M EDC for 1 min, and then the bonding agent was applied. For XPB, dentin was etched and treated with 0.3 M EDC for 1 min and then bonded with the primer-bonding agent. Control specimens were prepared without EDC treatment. Slices containing the adhesive-dentin interface were covered with fluorescein-conjugated gelatin and observed with a multiphoton confocal microscope. Fluorescence intensity emitted by hydrolyzed fluorescein-conjugated gelatin was quantified, and the amount of gelatinolytic activity was represented by the percentage of green fluorescence emitted within the HL. After 24 h of storage, enzymatic activity was detected by in situ zymography within the HLs of both tested adhesives, with XPB higher than CSE ( P < 0.05). Almost no fluorescence signal was detected when specimens were pretreated with EDC compared to controls ( P < 0.05). After 1 y of storage, enzymatic activities significantly increased for all groups (excluding XPB control) compared to 24-h storage ( P < 0.05), with EDC pretreated specimens exhibiting significantly lower activity than controls ( P < 0.05). The present study showed, for the first time, that the use of EDC for both the self-etch and the etch-and-rinse approaches results in the reduction but not complete inhibition of matrix-bound collagenolytic enzyme activities over time in the HL.
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Affiliation(s)
- A. Mazzoni
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna–Alma Mater Studiorum, Bologna, Italy
| | - V. Angeloni
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna–Alma Mater Studiorum, Bologna, Italy
| | - N. Sartori
- Division of Restorative Sciences, University of Southern California Herman Ostrow School of Dentistry, Los Angeles, CA, USA
| | - S. Duarte
- Division of Restorative Sciences, University of Southern California Herman Ostrow School of Dentistry, Los Angeles, CA, USA
| | - T. Maravic
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna–Alma Mater Studiorum, Bologna, Italy
| | - L. Tjäderhane
- Department of Oral and Maxillofacial Diseases, University of Helsinki, and Helsinki University Hospital, Helsinki, Finland
- Research Unit of Oral Health Sciences, and Medical Research Center Oulu (MRC Oulu), Oulu University Hospital and University of Oulu, Oulu, Finland
| | - D.H. Pashley
- The Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - F.R. Tay
- The Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - L. Breschi
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna–Alma Mater Studiorum, Bologna, Italy
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Abstract
Er-YAG laser irradiation has been claimed to improve the adhesive properties of dentin. We tested the hypothesis that dentin adhesion is affected by Er-YAG laser conditioning. Superficial or deep dentin from human molars was: (a) acid-etched with 35% H3PO4; (b) irradiated with an Er-YAG laser (KaVo) at 2 Hz and 180 mJ, with water-cooling; and (c) laser- and acid-etched. Single Bond (3M ESPE) and Z100 composite (3M ESPE) were bonded to the prepared surfaces. After storage, specimens were tested in shear to failure. Bonded interfaces were demineralized in EDTA and processed for transmission electron microscopy. Two-way ANOVA revealed that conditioning treatment and interaction between treatment and dentin depth significantly influenced shear bond strength results. Acid-etching alone yielded shear bond strength values that were significantly higher than those achieved with laser ablation alone, or in combination with acid-etching. The Er-YAG laser created a laser-modified layer that adversely affects adhesion to dentin, so it does not constitute an alternative bonding strategy to conventional acid etching.
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Affiliation(s)
- L. Ceballos
- Department of Dental Materials, University of Granada, Granada, Spain
- Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China; and
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, CA, USA
| | - M. Toledano
- Department of Dental Materials, University of Granada, Granada, Spain
- Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China; and
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, CA, USA
| | - R. Osorio
- Department of Dental Materials, University of Granada, Granada, Spain
- Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China; and
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, CA, USA
| | - F.R. Tay
- Department of Dental Materials, University of Granada, Granada, Spain
- Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China; and
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, CA, USA
| | - G.W. Marshall
- Department of Dental Materials, University of Granada, Granada, Spain
- Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China; and
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, CA, USA
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Tay F, Pashley D, Kapur R, Carrilho M, Hur Y, Garrett L, Tay K. Bonding BisGMA to Dentin—a Proof of Concept for Hydrophobic Dentin Bonding. J Dent Res 2016; 86:1034-9. [PMID: 17959892 DOI: 10.1177/154405910708601103] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The use of TEGDMA as a diluent comonomer in the formulation of hydrophobic adhesives for ethanol wet-bonding is a concern, due to its leaching potential, higher water sorption, and bio-incompatibility. This study tested the hypothesis that hydrophobic bonding to acid-etched dentin may be accomplished with the use of ethanol-solvated BisGMA only. Phosphoric-acid-etched, oxalate-occluded, deep coronal dentin bonded under 20 cm water pressure with experimental BisGMA adhesives by ethanol wet-bonding exhibited tensile strengths that were not significantly different from that achieved with OptiBond FL bonded according to the manufacturer-recommended protocol, with similar acid-/base-resistant hybrid layers, resin tags, and nanoleakage distribution. Ethanol replacement of water-saturated dentin produced wider interfibrillar spaces, more extensive shrinkage of the collagen fibrils, and narrower hybrid layers. Experimental BisGMA adhesives provide the proof of concept that relatively hydrophobic resins may be coupled to acid-etched dentin by increasing its hydrophobic characteristics via ethanol replacement. They should be further optimized before clinical application.
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Affiliation(s)
- F.R. Tay
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
| | - D.H. Pashley
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
| | - R.R. Kapur
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
| | - M.R.O. Carrilho
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
| | - Y.B. Hur
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
| | - L.V. Garrett
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
| | - K.C.Y. Tay
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- School of Dentistry, Medical College of Georgia, Augusta, GA, USA
- Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil; and
- University of Toronto, Ontario, Canada
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Chiba A, Zhou J, Nakajima M, Tan J, Tagami J, Scheffel D, Hebling J, Agee K, Breschi L, Grégoire G, Jang S, Tay F, Pashley D. The effects of ethanol on the size-exclusion characteristics of type I dentin collagen to adhesive resin monomers. Acta Biomater 2016; 33:235-41. [PMID: 26827779 DOI: 10.1016/j.actbio.2016.01.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 01/04/2016] [Accepted: 01/27/2016] [Indexed: 10/22/2022]
Abstract
During dentin bonding with etch-and-rinse adhesive systems, phosphoric acid etching of mineralized dentin solubilizes the mineral crystallites and replaces them with bound and unbound water. During the infiltration phase of dentin bonding, solvated adhesive resin comonomers are supposed to replace all of the unbound collagen water and polymerize into copolymers. A recently published review suggested that dental monomers are too large to enter and displace water from tightly-packed collagen molecules. Conversely, recent work from the authors' laboratory demonstrated that HEMA and TEGDMA freely equilibrate with water-saturated dentin matrices. However, because adhesive blends are solvated in organic solvents, those solvents may remove enough free water to allow collagen molecules to come close enough to exclude adhesive monomer permeation. The present study analyzed the size-exclusion characteristics of dentin collagen, using a gel permeation-like column chromatography technique, filled with dentin powder instead of Sephadex beads as the stationary phase. The elution volumes of different sized test molecules, including adhesive resin monomers, studied in both water-saturated dentin, and again in ethanol-dehydrated dentin powder, showed that adhesive resin monomers can freely diffuse into both hydrated and dehydrated collagen molecules. Under these in vitro conditions, all free and some of the loosely-bound water seems to have been removed by ethanol. These results validate the concept that adhesive resin monomers can permeate tightly-bound water in ethanol-saturated collagen molecules during infiltration by etch-and-rinse adhesives. STATEMENT OF SIGNIFICANCE It has been reported that collagen molecules in dentin matrices are packed too close together to allow permeation of adhesive monomers between them. Resin infiltration, in this view, would be limited to extrafibrillar spaces. Our work suggests that monomers equilibrate with collagen water in both water and ethanol-saturated dentin matrices.
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Ozcan S, Seseogullari-Dirihan R, Uctasli M, Tay F, Pashley D, Tezvergil-Mutluay A. Effect of polyacrylic acid on dentin protease activities. Dent Mater 2015; 31:901-6. [DOI: 10.1016/j.dental.2015.04.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 04/09/2015] [Accepted: 04/28/2015] [Indexed: 10/23/2022]
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Senti G, Moos S, Tay F, Graf N, Johansen P, Kündig TM. Determinants of efficacy and safety in epicutaneous allergen immunotherapy: summary of three clinical trials. Allergy 2015; 70:707-10. [PMID: 25704072 PMCID: PMC4654258 DOI: 10.1111/all.12600] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/16/2015] [Indexed: 11/29/2022]
Abstract
The results of our third trial on epicutaneous allergen-specific immunotherapy (EPIT) will be presented and discussed in the context of our previous trials. This monocentric, placebo-controlled, double-blind phase I/IIa trial included 98 patients with grass pollen rhinoconjunctivitis. Prior to the pollen season 2009, patients received six patches (allergen extract: n = 48; placebo: n = 50) with weekly intervals, administered onto tape-stripped skin. Allergen EPIT produced a median symptom improvement of 48% in 2009 and 40% in the treatment-free follow-up year 2010 as compared to 10% and 15% improvement after placebo EPIT (P = 0.003). After allergen EPIT but not placebo EPIT, conjunctival allergen reactivity was significantly decreased and allergen-specific IgG4 responses were significantly elevated (P < 0.001). In conclusion, our three EPIT trials found that allergen EPIT can ameliorate hay fever symptoms. Overall, treatment efficacy appears to be determined by the allergen dose. Local side-effects are determined by the duration of patch administration, while risk of systemic allergic side-effects is related to the degree of stratum corneum disruption.
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Affiliation(s)
- G. Senti
- Clinical Trials Center University of Zurich Zurich Switzerland
| | - S. Moos
- Department of Internal Medicine University Hospital Zurich Zurich Switzerland
| | - F. Tay
- Clinical Trials Center University of Zurich Zurich Switzerland
| | - N. Graf
- Graf Biostatistics Winterthur Switzerland
| | - P. Johansen
- Department of Dermatology University Hospital Zurich Zurich Switzerland
| | - T. M. Kündig
- Department of Dermatology University Hospital Zurich Zurich Switzerland
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Chen C, Niu LN, Xie H, Zhang ZY, Zhou LQ, Jiao K, Chen JH, Pashley D, Tay F. Bonding of universal adhesives to dentine – Old wine in new bottles? J Dent 2015; 43:525-36. [DOI: 10.1016/j.jdent.2015.03.004] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 03/11/2015] [Accepted: 03/13/2015] [Indexed: 10/23/2022] Open
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Epasinghe D, Yiu C, Burrow M, Tsoi J, Tay F. Effect of flavonoids on the mechanical properties of demineralised dentine. J Dent 2014; 42:1178-84. [DOI: 10.1016/j.jdent.2014.07.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 06/23/2014] [Accepted: 07/01/2014] [Indexed: 10/25/2022] Open
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Turco G, Marsich E, Mazzoni A, Di Lenarda R, Cadenaro M, Tay F, Pashley D, Breschi L. Biocompatibility of EDC cross-linked demineralized dentin collagen matrix. Dent Mater 2014. [DOI: 10.1016/j.dental.2014.08.309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pucci C, Feitosa F, Loriggio A, Feitosa S, Araújo R, Tay F. Effect of high-power-laser and graphite surface treatments on ceramics bond-strength. Dent Mater 2014. [DOI: 10.1016/j.dental.2014.08.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Angeloni V, Mazzoni A, Cadenaro M, Santi S, Falconi M, Di Lenarda R, Tay F, Pashley D, Breschi L. Effect of EDC on the interface of a self-etch adhesive. Dent Mater 2014. [DOI: 10.1016/j.dental.2014.08.128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Takahashi M, Nakajima M, Tagami J, Scheffel D, Carvalho R, Mazzoni A, Cadenaro M, Tezvergil-Mutluay A, Breschi L, Tjäderhane L, Jang S, Tay F, Agee K, Pashley D. The importance of size-exclusion characteristics of type I collagen in bonding to dentin matrices. Acta Biomater 2013; 9:9522-8. [PMID: 23928333 DOI: 10.1016/j.actbio.2013.07.037] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 07/11/2013] [Accepted: 07/30/2013] [Indexed: 10/26/2022]
Abstract
The mineral phase of dentin is located primarily within collagen fibrils. During development, bone or dentin collagen fibrils are formed first and then water within the fibril is replaced with apatite crystallites. Mineralized collagen contains very little water. During dentin bonding, acid-etching of mineralized dentin solubilizes the mineral crystallites and replaces them with water. During the infiltration phase of dentin bonding, adhesive comonomers are supposed to replace all of the collagen water with adhesive monomers that are then polymerized into copolymers. The authors of a recently published review suggested that dental monomers were too large to enter and displace water from collagen fibrils. If that were true, the endogenous proteases bound to dentin collagen could be responsible for unimpeded collagen degradation that is responsible for the poor durability of resin-dentin bonds. The current work studied the size-exclusion characteristics of dentin collagen, using a gel-filtration-like column chromatography technique, using dentin powder instead of Sephadex. The elution volumes of test molecules, including adhesive monomers, revealed that adhesive monomers smaller than ∼1000 Da can freely diffuse into collagen water, while molecules of 10,000 Da begin to be excluded, and bovine serum albumin (66,000 Da) was fully excluded. These results validate the concept that dental monomers can permeate between collagen molecules during infiltration by etch-and-rinse adhesives in water-saturated matrices.
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Pucci C, Perote L, Huhtala M, Kamozaki M, Tay F. Effect of matrix metalloproteinase-inhibiting solutions and aging-processes on dentin bond-strength. Dent Mater 2013. [DOI: 10.1016/j.dental.2013.08.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Mazzoni A, Apolônio F, Saboia V, Santi S, Turco G, Di Lenarda R, Tay F, Pashley D, Breschi L. EDC inactivates endogenous MMPs within the hybrid layer. Dent Mater 2013. [DOI: 10.1016/j.dental.2013.08.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ferrari M, Vichi A, Fadda G, Cagidiaco M, Tay F, Breschi L, Polimeni A, Goracci C. A Randomized Controlled Trial of Endodontically Treated and Restored Premolars. J Dent Res 2012; 91:72S-78S. [DOI: 10.1177/0022034512447949] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This in vivo study examined the contribution of remaining coronal dentin and placement of a prefabricated (LP) or customized fiber post (ES) to the six-year survival of endodontically treated premolars. A sample of 345 patients provided 6 groups of 60 premolars each in need of endodontic treatment. Groups were classified according to the number of remaining coronal walls before abutment build-up. Within each group, teeth were allocated to one of three subgroups: (A) no post retention; (B) LP; or (C) ES (N = 20). All teeth were protected with a crown. Cox regression analysis revealed that fiber post retention significantly improved tooth survival (p < 0.001). Failure risk was lower in teeth restored with prefabricated (p = 0.001) than with customized posts (p = 0.009). Teeth with one (p = 0.004), two (p < 0.001), and three coronal walls (p < 0.001) had significantly lower failure risks than those without ferrule. Similar failure risks existed for teeth without coronal walls, regardless of the presence/absence of ferrule (p = 0.151). Regardless of the restorative procedure, the preservation of at least one coronal wall significantly reduced failure risk ( ClinicalTrials.gov number CT01532947).
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Affiliation(s)
- M. Ferrari
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - A. Vichi
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - G.M. Fadda
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - M.C. Cagidiaco
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
| | - F.R. Tay
- Department of Endodontics, College of Dentistry, Georgia Health Sciences University, 1120 15th Street, Augusta, GA, USA
| | - L. Breschi
- Department of Medical Sciences, University of Trieste, Piazza, Ospedale 1, Trieste 34129, Italy
| | - A. Polimeni
- Department of Oral Sciences, ‘Sapienza’ University of Rome, viale Regina Elena 287/A, Roma, Italy
| | - C. Goracci
- Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena 53100, Italy
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Marino Cugno Garrano A, La Rosa G, Zhang D, Niu LN, Tay F, Majd H, Arola D. On the mechanical behavior of scales from Cyprinus carpio. J Mech Behav Biomed Mater 2012; 7:17-29. [DOI: 10.1016/j.jmbbm.2011.07.017] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Revised: 07/28/2011] [Accepted: 07/30/2011] [Indexed: 11/28/2022]
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20
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Mazzoni A, Angeloni V, Turco G, Tay F, Pashley D, Breschi L. Effect of carbodiimide on dentin bonding. Dent Mater 2012. [DOI: 10.1016/j.dental.2012.07.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Turco G, Cadenaro M, Mazzoni A, Tay F, Pashley D, Breschi L. Elution of chlorhexidine and BisGMA from an experimental adhesive resin. Dent Mater 2012. [DOI: 10.1016/j.dental.2012.07.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Gong S, Niu LN, Rueggeberg F, Tay F. Mechanical and physical properties of a quaternary ammonium-methacrylate silicate polymer. Dent Mater 2012. [DOI: 10.1016/j.dental.2012.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Niu LN, Gong S, Rueggeberg F, Tay F. Antimicrobial properties of a PMMA-containing bound quaternary ammonium-methacrylate silicate. Dent Mater 2012. [DOI: 10.1016/j.dental.2012.07.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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25
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Cova A, Breschi L, Nato F, Ruggeri A, Carrilho M, Tjäderhane L, Prati C, Di Lenarda R, Tay F, Pashley D, Mazzoni A. Effect of UVA-activated riboflavin on dentin bonding. J Dent Res 2011; 90:1439-45. [PMID: 21940521 PMCID: PMC3215759 DOI: 10.1177/0022034511423397] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 08/13/2011] [Accepted: 08/21/2011] [Indexed: 11/15/2022] Open
Abstract
Recent studies have reported collagen cross-linking after exposure to riboflavin followed by ultraviolet-A (UVA) exposure. This study is the first to investigate the effect of a riboflavin-containing primer on adhesive interface stability and dentinal matrix metalloproteinase activity. Human dentin was etched with 35% phosphoric acid, treated with 0.1% riboflavin, exposed to UVA for 2 min, and bonded with a two-step etch-and-rinse adhesive. Adhesive was applied to control specimens without riboflavin/UVA. Specimens were subjected to microtensile bond strength tests and pulled to failure after storage for 24 hrs, 6 mos, or 1 yr. Interfacial nanoleakage was evaluated by light and transmission electron microscopy. To investigate dentinal matrix metalloproteinase activity, we performed correlative zymographic assays on protein extracts obtained from phosphoric-acid-etched dentin powder with or without riboflavin/UVA treatment and XP Bond. Ultraviolet-activated riboflavin treatment increased the immediate bond strength to dentin at all aging intervals (p < 0.05 vs. control) and decreased interfacial nanoleakage in aged specimens (1 yr; p < 0.05). Zymograms revealed that riboflavin/UVA pre-treatment inhibited dentinal matrix metalloproteinase activity (especially MMP-9). In conclusion, dentinal collagen cross-linking induced by riboflavin/UVA increased immediate bond strength, stabilized the adhesive interface, and inhibited dentin matrix metalloproteinases, thereby increasing the durability of resin-dentin bonds.
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Affiliation(s)
- A. Cova
- Department of SAU&FAL, University of Bologna, Via Irnerio, 48, 40100 Bologna, Italy
| | - L. Breschi
- Department of Medical Sciences, Unit of Dental Sciences and Biomaterials, University of Trieste, Trieste, Italy
- IGM, Unit of Bologna, C.N.R.-IOR, Bologna, Italy
| | - F. Nato
- Department of SAU&FAL, University of Bologna, Via Irnerio, 48, 40100 Bologna, Italy
- Department of STeVA, University “Carlo Bo”, Urbino, Italy
| | - A. Ruggeri
- Department of SAU&FAL, University of Bologna, Via Irnerio, 48, 40100 Bologna, Italy
| | - M. Carrilho
- Biomaterials Research Group, Bandeirante University of São Paulo – UNIBAN, Brazil
| | - L. Tjäderhane
- Institute of Dentistry, University of Oulu, Oulu University Hospital, Oulu, Finland
| | - C. Prati
- Department of Dental Sciences, University of Bologna, Bologna, Italy
| | - R. Di Lenarda
- Department of Medical Sciences, Unit of Dental Sciences and Biomaterials, University of Trieste, Trieste, Italy
| | - F.R. Tay
- Department of Endodontics, College of Dental Medicine, Georgia Health Sciences University, Augusta, GA, USA
| | - D.H. Pashley
- Department of Oral Biology, College of Dental Medicine, Georgia Health Sciences University, Augusta, GA, USA
| | - A. Mazzoni
- Department of SAU&FAL, University of Bologna, Via Irnerio, 48, 40100 Bologna, Italy
- Laboratory of Cell Biology & Laboratory of Immunorheumatology and Tissue Regeneration–Ramses Laboratory, c/o Rizzoli Orthopedic Institute, Bologna, Italy
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Tezvergil-Mutluay A, Agee K, Mutluay M, Tay F, Pashley D. The effect of dentin treatment on MMP-mediated collagen degradation. Dent Mater 2011. [DOI: 10.1016/j.dental.2011.08.456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Gu L, Kim Y, Liu Y, Ryou H, Wimmer C, Dai L, Arola D, Looney S, Pashley D, Tay F. Biomimetic analogs for collagen biomineralization. J Dent Res 2011; 90:82-7. [PMID: 20940362 PMCID: PMC3143382 DOI: 10.1177/0022034510385241] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Revised: 06/26/2010] [Accepted: 06/28/2010] [Indexed: 11/17/2022] Open
Abstract
Inability of chemical phosphorylation of sodium trimetaphosphate to induce intrafibrillar mineralization of type I collagen may be due to the failure to incorporate a biomimetic analog to stabilize amorphous calcium phosphates (ACP) as nanoprecursors. This study investigated adsorption/desorption characteristics of hydrolyzed and pH-adjusted sodium trimetaphosphate (HPA-Na(3)P(3)O(9)) to collagen. Based on those results, a 5-minute treatment time with 2.8 wt% HPA-Na(3)P(3)O(9) was used in a single-layer reconstituted collagen model to confirm that both the ACP-stabilization analog and matrix phosphoprotein analog must be present for intrafibrillar mineralization. The results of that model were further validated by complete remineralization of phosphoric-acid-etched dentin treated with the matrix phosphoprotein analog and lined with a remineralizing lining composite, and with the ACP-stabilization analog supplied in simulated body fluid. An understanding of the basic processes involved in intrafibrillar mineralization of reconstituted collagen fibrils facilitates the design of novel tissue engineering materials for hard tissue repair and regeneration.
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Affiliation(s)
- L. Gu
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Y.K. Kim
- Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - Y. Liu
- Department of Stomatology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - H. Ryou
- Laboratory of Advanced Materials and Processes, Mechanical Engineering Department, University of Maryland Baltimore County, Baltimore, MD, USA
| | - C.E. Wimmer
- Department of Biostatistics, Medical College of Georgia, Augusta, GA, USA
| | - L. Dai
- Department of Stomatology, The First Hospital of Wuhan, Wuhan, China
| | - D.D. Arola
- Laboratory of Advanced Materials and Processes, Mechanical Engineering Department, University of Maryland Baltimore County, Baltimore, MD, USA
| | - S.W. Looney
- Department of Biostatistics, Medical College of Georgia, Augusta, GA, USA
| | | | - F.R. Tay
- Department of Oral Biology
- Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
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28
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Mazzoni A, Papa V, Carrilho M, Tjäderhane L, Tay F, Pashley D, Breschi L. MMP-2 and -9 activity induced by etch-and-rinse adhesives. Dent Mater 2011. [DOI: 10.1016/j.dental.2011.08.429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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29
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Tay F, Kündig TM, Senti G. [Allergen specific immunotherapy: new approaches]. Praxis (Bern 1994) 2010; 99:1279-1284. [PMID: 20960398 DOI: 10.1024/1661-8157/a000276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Specific immunotherapy (SIT) is the only disease-modifying and causal treatment of IgE mediated allergic diseases. Soon this treatment will turn 100 years old. Subcutaneous immunotherapy is still considered to be the gold standard of SIT. With the intention to improve efficacy, safety and desirability for patients, new strategies such as epicutaneous immunotherapy, i.e. administration of allergens using a skin patch, are under investigation in clinical trials at the Zurich University Hospital.
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MESH Headings
- Administration, Cutaneous
- Administration, Sublingual
- Allergens/administration & dosage
- Allergens/immunology
- Desensitization, Immunologic/adverse effects
- Desensitization, Immunologic/methods
- Epitopes/immunology
- Humans
- Injections, Subcutaneous
- Lymph Nodes/drug effects
- Rhinitis, Allergic, Perennial/immunology
- Rhinitis, Allergic, Perennial/therapy
- Rhinitis, Allergic, Seasonal/immunology
- Rhinitis, Allergic, Seasonal/therapy
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Affiliation(s)
- F Tay
- Clinical Trials Center, Zentrum für Klinische Forschung, Universitätsspital und Universität Zürich, Zürich.
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30
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Hiraishi N, Yiu C, King N, Tay F. Effect of chlorhexidine incorporation into a self-etching primer on dentine bond strength of a luting cement. J Dent 2010; 38:496-502. [DOI: 10.1016/j.jdent.2010.03.005] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 01/25/2010] [Accepted: 03/10/2010] [Indexed: 11/26/2022] Open
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31
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Hosoya Y, Tay F, Ono T, Miyazaki M. Hardness, elasticity and ultrastructure of primary tooth dentin bonded with a self-reinforcing one-step self-etch adhesive. J Dent 2010; 38:214-21. [DOI: 10.1016/j.jdent.2009.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 09/12/2009] [Accepted: 10/22/2009] [Indexed: 10/20/2022] Open
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32
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Carrilho M, Sousa E, di Hipolito V, Carvalho R, Breschi L, Tjäderhane L, Mazzoni A, Tay F, Pashley D. Substantivity of chlorhexidine to human dentin. Dent Mater 2010. [DOI: 10.1016/j.dental.2009.11.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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33
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Tezvergil-Mutluay A, Agee K, Tay F, Pashley D. Use of quaternary ammonium methacrylates to inhibit dentin matrix MMPs. Dent Mater 2010. [DOI: 10.1016/j.dental.2009.11.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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34
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Mazzoni A, Nato F, Nucci C, Carrilho M, Tjäderhane L, Tay F, Pashley D, Breschi L. Longevity of the bond created by 0.2% CHX-containing scotchbond 1XT. Dent Mater 2010. [DOI: 10.1016/j.dental.2010.08.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Visintini E, Cadenaro M, di Lenarda R, Tay F, Pashley D, Breschi L. QAM-based primers do not affect immediate bond strength of an etch-and-rinse adhesive. Dent Mater 2010. [DOI: 10.1016/j.dental.2010.08.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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36
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Angeloni V, Marchesi G, Cadenaro M, Mazzoni A, Tay F, Pashley D, Breschi L. The effect of chlorhexidine pre-treatment on the bond strength of fiber posts. Dent Mater 2010. [DOI: 10.1016/j.dental.2010.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Mutluay M, Tezvergil-Mutluay A, Agee K, Carvalho R, Manso A, Tay F, Suh BY, Pashley D. The anti-MMP activity of benzalkonium chloride. Dent Mater 2010. [DOI: 10.1016/j.dental.2010.08.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Marchesi G, Cadenaro M, Di Lenarda R, Tay F, Pashley D, Breschi L. Influence of ethanol on E-modulus of experimental adhesive blends. Dent Mater 2010. [DOI: 10.1016/j.dental.2010.08.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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39
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Cadenaro M, Pashley D, Marchesi G, Carrilho M, Antoniolli F, Mazzoni A, Tay F, Di Lenarda R, Breschi L. Influence of chlorhexidine on the degree of conversion and E-modulus of experimental adhesive blends. Dent Mater 2009; 25:1269-74. [DOI: 10.1016/j.dental.2009.05.008] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Accepted: 05/27/2009] [Indexed: 11/29/2022]
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40
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Hiraishi N, Yiu C, King N, Tay F. Effect of 2% chlorhexidine on dentin microtensile bond strengths and nanoleakage of luting cements. J Dent 2009; 37:440-8. [DOI: 10.1016/j.jdent.2009.02.002] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2008] [Revised: 01/15/2009] [Accepted: 02/03/2009] [Indexed: 11/25/2022] Open
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41
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Cadenaro M, Breschi L, Rueggeberg F, Agee K, Di Lenarda R, Tay F, Pashley D. Permeability of resins bonded to water vs. ethanol-saturated acid-etched dentin. Dent Mater 2009. [DOI: 10.1016/j.dental.2009.01.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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Sadek F, Castellan C, Tay F, Pashley D, Braga R. Minimizing dentin bond degradation using a hydrophobic adhesive and an ethanol wet-bonding technique. Dent Mater 2009. [DOI: 10.1016/j.dental.2009.01.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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43
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Chee HK, Lim LP, Tay F, Thai AC, Sum CF. Non-surgical periodontal treatment and lipid levels in diabetic patients. Ann R Australas Coll Dent Surg 2008; 19:183. [PMID: 22073478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Affiliation(s)
- H K Chee
- Periodontics Unit, Department of Restorative Dentistry, National Dental Centre, Singapore.
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Carrilho MRO, Geraldeli S, Tay F, de Goes MF, Carvalho RM, Tjäderhane L, Reis AF, Hebling J, Mazzoni A, Breschi L, Pashley D. In vivo preservation of the hybrid layer by chlorhexidine. J Dent Res 2007; 86:529-33. [PMID: 17525352 DOI: 10.1177/154405910708600608] [Citation(s) in RCA: 377] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Host-derived proteases have been reported to degrade the collagen matrix of incompletely-resin-infiltrated dentin. This study tested the hypothesis that interfacial degradation of resin-dentin bonds may be prevented or delayed by the application of chlorhexidine (CHX), a matrix metalloproteinase inhibitor, to dentin after phosphoric acid-etching. Contralateral pairs of resin-bonded Class I restorations in non-carious third molars were kept under intra-oral function for 14 months. Preservation of resin-dentin bonds was assessed by microtensile bond strength tests and TEM examination. In vivo bond strength remained stable in the CHX-treated specimens, while bond strength decreased significantly in control teeth. Resin-infiltrated dentin in CHX-treated specimens exhibited normal structural integrity of the collagen network. Conversely, progressive disintegration of the fibrillar network was identified in control specimens. Auto-degradation of collagen matrices can occur in resin-infiltrated dentin, but may be prevented by the application of a synthetic protease inhibitor, such as chlorhexidine.
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Affiliation(s)
- M R O Carrilho
- Department of Restorative Dentistry, Dental Materials Area, University of Campinas, Piracicaba School of Dentistry, Piracicaba/SP, Brazil
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45
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Hashimoto M, Tay F, Svizero N, de Gee A, Feilzer A, Sano H, Kaga M, Pashley D. The effects of common errors on sealing ability of total-etch adhesives. J Prosthet Dent 2007. [DOI: 10.1016/j.prosdent.2006.08.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
The purpose of this study was to determine if hydrophobic resins can be coaxed into dentin wet with ethanol instead of water. The test hypothesis was that dentin wet with ethanol would produce higher bond strengths for hydrophobic resins than would dentin wet with water. This study examined the microtensile bond strength of 5 experimental adhesives (50 wt% ethanol/50% comonomers) of various degrees of hydrophilicity to acid-etched dentin that was left moist with water, moist with ethanol, or air-dried. Following composite buildups, hourglass-shaped slabs were prepared from the bonded teeth for microtensile testing. For all 3 types of dentin surfaces, higher bond strengths were achieved with increased resin hydrophilicity. The lowest bond strengths were obtained on dried dentin, while the highest bond strengths were achieved when dentin was bonded moist with ethanol. Wet-bonding with ethanol achieved higher bond strengths with hydrophobic resins than were possible with water-saturated matrices.
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Affiliation(s)
- Y. Nishitani
- Department of Operative Dentistry, Okayama University, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - M. Yoshiyama
- Department of Operative Dentistry, Okayama University, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - A.M. Donnelly
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
| | - K.A. Agee
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
| | - J. Sword
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
| | - F.R. Tay
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
| | - D.H. Pashley
- Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
- corresponding author,
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Chee HK, Lim LP, Tay F, Thai AC, Sum CF. Non-surgical periodontal therapy and serum lipid levels in patients with diabetes mellitus. Ann R Australas Coll Dent Surg 2006; 18:46. [PMID: 17668592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Affiliation(s)
- H K Chee
- National Dental Centre, Singapore
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Nishitani Y, Yoshiyama M, Tay F, Wadgaonkar B, Waller J, Agee K, Pashley D. Tensile strength of mineralized/demineralized human normal and carious dentin. J Dent Res 2005; 84:1075-8. [PMID: 16246945 PMCID: PMC1761123 DOI: 10.1177/154405910508401121] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The bond strengths of resins to caries-affected dentin are low. This could be due to weakened organic matrix. The purpose of this work was to determine if the ultimate tensile strength (UTS) of excavated carious dentin is weaker than that of normal dentin. Soft caries was excavated from extracted human molars, and the tooth was vertically sectioned into slabs. Each slab was trimmed to an hourglass shape, parallel or perpendicular to the tubule direction. Half of the specimens were mineralized, while the other half were completely demineralized in EDTA. ANOVA on ranks showed that the three-factor interactions (mineralization, caries, tubule direction) were all significant (p < 0.0001), indicating that mineralization and tubule direction gave different UTS results in normal and caries-affected dentin. No significant differences were seen between the UTS of normal and and that of caries-affected demineralized dentin in the parallel or perpendicular group. The matrix of demineralized caries-affected dentin was as strong as that of normal demineralized dentin when tested in the same direction.
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Affiliation(s)
- Y. Nishitani
- Department of Operative Dentistry, Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700-8525, Japan
| | - M. Yoshiyama
- Department of Operative Dentistry, Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700-8525, Japan
| | - F.R. Tay
- Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Hong Kong, SAR, China
| | - B. Wadgaonkar
- Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA; and
| | - J. Waller
- Office of Biostatistics, Medical College of Georgia, Augusta, GA, USA
| | - K. Agee
- Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA; and
| | - D.H. Pashley
- Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA; and
- *corresponding author,
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49
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Frankenberger R, Tay F. Self-etch vs etch-and-rinse adhesives: effect of thermo-mechanical fatigue loading on marginal quality of bonded resin composite restorations. J Prosthet Dent 2005. [DOI: 10.1016/j.prosdent.2005.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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50
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