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1

The effect of saturation by artificial saliva on the effectiveness of denture adhesives

100%

Kasperski J. , Chladek G. , Żmudzki J. , Lipski T.

Archives of Materials Science and Engineering

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2011

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tom Vol. 51, nr 1

25-32

EN

Purpose: of this examination was to evaluate the impact of saturation of adhesive materials by artificial saliva upon the generated bonding force. Design/methodology/approach: Four selected types of denture adhesives have been chosen. Measurements of bonding forces of the materials of different degree of saturation by artificial saliva have been carried out by dynamometer. The stamp covered by denture adhesive was pressed against the glass with force of 30 - 40 N and then keeping perpendicular movement against the glass, the stamp was pulled off and the joining was broken. It has been assumed that the bonding force was the equivalent of maximal pulling off force obtained in the test. The samples of different degree of saturation by artificial saliva have been exposed to tests of extensibility in a device of own design. The final denture adhesives have been put on the complete denture. It was pressed down against the denture bearing area model and next the values of retention forces were determined on a universal testing machine. Findings: Proper saturation of the samples by artificial saliva makes it possible to obtain approximate values of retention force for the majority of denture adhesives. However excessive saturation of adhesive materials can result in considerable reduction of their effectiveness. Research limitations/implications: The samples are handmade as well as part of the measurements are carried out manually and this is justified by the specific clinical conditions. Practical implications: Analysis of the impact of the level of saturation of denture adhesives by artificial saliva upon the generated bonding force highlights the need for individual selection of adhesive creams. The choice of material should be related to individual features such as secretion of saliva. It is advisable to introduce into clinical practice the option of adjusting the optimum saturation of particular denture adhesives by artificial saliva materials. Originality/value: The presented research work results allow to combine the secretion of saliva with the effectiveness of denture adhesives.

2

Ultimate flexural strength and Young’s modulus analysis of denture base resins for masked stereolithography 3D printing technology

63%

Penchev P.

Archives of Materials Science and Engineering

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2024

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tom Vol. 126, nr 2

78--85

EN

Purpose: of the study is to investigate the ultimate flexural strength and Young’s modulus of some materials, which can be used for complete denture fabrication by Masked stereolithography 3D printing technology. Design/methodology/approach: Three groups of five specimens each were fabricated. Two of the groups are 3D printed by Masked SLA 3D printer of two commonly used denture base resins. The third group is set to be a control as the specimens were fabricated of a heat-curing acrylic resin. A three-point flexural test tested the objects, and the data collected was used to determine ultimate flexural strength and Young’s modulus calculation. All the results are compared to the ISO Standard 20795-1. Findings: The data shows that the mean ultimate flexural strength of the 3D printed specimens is 87 MPa - 89 MPa. Their results are very similar to those for the heat-curing acrylic resin, which means the ultimate flexural strength is 93 MPa. The mean Young’s modulus obtained for the first group of 3D printed specimens is 2263.21 MPa and 2377.44 MPa for the second one. As for the control group, 2396.06 MPa is achieved. When ISO Standard 20795-1 is inspected, all the data obtained covers the minimum requirements. Research limitations/implications: The limitations of the study concern to some additional factors that should be observed for more detailed evaluation. For example, the level of the final polymerization of light-curing resins for 3D printing, their ability to washstand to different defect and denture-bearing area characteristics (the notch for the labial and buccal frenulum, chambers for torus release, etc.), the ability of the materials to withstand to cyclic load, etc. Practical implications: 3D printing is faster and cheaper than conventional methods for complete denture fabrication. The knowledge about the mechanical properties of the different materials for 3D printing is very valuable for properly selecting a material and approach for complete denture fabrication. Originality/value: Nowadays, 3D printing is essential in dentistry. For this reason, observation and knowledge of the raw materials properties is very important for the proper choice of a material and/or technology for each clinical case.

3

Development trends of mucous-borne dentures in the aspect of elastomers applications

63%

Dobrzańska-Danikiewicz A. , Żmudzki J.

Archives of Materials Science and Engineering

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2012

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tom Vol. 55, nr 1

5-13

EN

Purpose: The aim of this study is to foreseen the influence of elastomers on the development of mucous-borne dentures in the aspect of bio-compatible use of prosthetic foundation tissue load bearing capacity. Design/methodology/approach: Multi-criteria comparative analysis based on the dendrological matrix of attractiveness and potential was used for the studies of denture solution and materials. There were differentiated seven groups of conventional dentures without an implantological stabilisation - the so-called hard dentures (CD) and those with a soft relining (CD-P), stabilized on one implant (SID) or on two implants (TID), that were differentiated as far as the denture attachment to implant was concerned. The first group was marked as "hard" (K) due to the used materials and inconsiderable lateral compliance. The elastomeric attachments (S) constituted the second group of attachments. Findings: In case of conventional dentures a significant influence of the relining on attractiveness was observed. In case of dentures retained on elastomeric attachments - they decided not only on the attractiveness, but they have also significantly increased dentures' potential. Research limitations/implications: Throughout the studies the variation of denture bearing structure materials were not taken into account, based on the assumption that acrylates are the most commonly used. Practical implications: The similar level of attractiveness of dentures retained on implants significantly varying as far as their construction is concerned shows that the focus should be mainly put on material design of elastomers' wearing characteristics. Originality/value: Multi-criteria heuristic analysis proved to be an effective tool for examination of dentures in the aspect evaluation of dentures material and cosntruction that show perspectives of the broadest use due to exploitation of the tissue bearing capability.

4

Durability evaluation of a friction couple intended for implantological stabilization of complete dentures

51%

Chladek G.

Acta of Bioengineering and Biomechanics

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2008

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tom Vol. 10, nr 3

7-12

EN

The paper presents the results of the study of the titanium implant–elastomeric membrane attachment, conducted from the point of view of potential utilization of the results in forecasting the durability of retention elements representing a new solution of dentures based on implants. The examination was carried out using a device designed by the author, which allowed the simulation of the process of inserting and removing dentures. Titanium counter specimens, simulating implants, were subjected to surface modification through their sandblasting with 350 ěm and 500 ěm abrasives, so as to diversify their roughness. The elastomeric membranes constituting a retention element of the attachment were made of a silicone material, Molloplast B. The influence of the number of cycles (one cycle meaning one insertion and removal of a denture) on the attachment’s retention force was studied. In order to better reflect the natural conditions, the device was equipped with a chamber which made it possible to perform the examination in an artificial saliva environment. The study has shown that the application of the polymer material Molloplast B for constructing the new type retention elements of dentures based on implants ensures practically constant values of the attachment's retention force in the required 6-month utilization period. After the time of denture usage, being eight times longer than originally assumed, the loss of retention force does not exceed 43% in any of the attachments investigated and the retention force values still allow the attachments to operate, although their effectiveness is partly reduced.

5

Application of a diagnostic-therapeutic procedure using implant-supported dental prosthesis as a preventive therapy for candidiasis of upper gastrointestinal tract in complete denture users

51%

Majewski S. , Loster B. W. , Macura A. B. , Wisniewska G. , Sliwowski Z. , Mazurkiewicz-Janik M. , Konturek S. J.

Journal of Physiology and Pharmacology. Supplement

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2008

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tom 59

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nr 5

39-46