The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Jorge L Garaicoa - One of the best experts on this subject based on the ideXlab platform.

  • Dental Impression materials and techniques
    Dental Clinics of North America, 2017
    Co-Authors: Amit Punj, Despoina Bompolaki, Jorge L Garaicoa
    Abstract:

    : Dental Impression making is the process of creating a negative form of the teeth and oral tissues, into which gypsum or other die materials can be processed to create working analogues. Contemporary dentistry generates new information every year and digital dentistry is becoming established and influential. Although dentists should stay abreast of new technologies, some of the conventional materials and time-tested techniques remain widely used. It is important to review the Impression-making process to ensure that practitioners have up-to-date information about how to safely and effectively capture the exact form of the oral tissues to provide optimal patient management.

M P Patel - One of the best experts on this subject based on the ideXlab platform.

  • some aspects of the formulation of alginate Dental Impression materials setting characteristics and mechanical properties
    Dental Materials, 2012
    Co-Authors: Navina Nallamuthu, M Braden, M P Patel
    Abstract:

    Abstract Objective To study the role of the various components of alginate Dental Impression materials. Methods Experimental materials were formulated and their physical properties characterized and compared to commercially available counterparts (Neocolloid, Palgat Plus and Blueprint Cremix). Properties examined were: dimensional stability and weight change in water and artificial saliva; setting behavior; Shore A hardness and tear energy. The role of magnesium oxide was also investigated. Results Weight changes in water and artificial saliva can be attributed to an initial thermodynamic potential owing to the ionic content of the alginate, causing water to diffuse into the material. Water is then driven back out following a reversal of this potential. Hardness results for experimental materials were within the range obtained from the commercial materials. The hardness value for an experimental formulation that did not contain magnesium oxide was lower than values from the other experimental materials that did. Tear energies for all three experimental materials were greater than those of the commercial products. There were statistically significant differences between the two experimental materials that contained magnesium oxide and one that did not. With regard to setting time, statistically significant differences were seen between commercial materials and two of the experimental materials. The experimental material that did not contain magnesium oxide had a considerably longer setting time than all of the other materials tested. Significance The key role of magnesium oxide in the setting reaction and the effect on hardness have been demonstrated and discussed.

  • Some aspects of the formulation of alginate Dental Impression materials—Setting characteristics and mechanical properties
    Dental Materials, 2012
    Co-Authors: Navina Nallamuthu, M Braden, M P Patel
    Abstract:

    Abstract Objective To study the role of the various components of alginate Dental Impression materials. Methods Experimental materials were formulated and their physical properties characterized and compared to commercially available counterparts (Neocolloid, Palgat Plus and Blueprint Cremix). Properties examined were: dimensional stability and weight change in water and artificial saliva; setting behavior; Shore A hardness and tear energy. The role of magnesium oxide was also investigated. Results Weight changes in water and artificial saliva can be attributed to an initial thermodynamic potential owing to the ionic content of the alginate, causing water to diffuse into the material. Water is then driven back out following a reversal of this potential. Hardness results for experimental materials were within the range obtained from the commercial materials. The hardness value for an experimental formulation that did not contain magnesium oxide was lower than values from the other experimental materials that did. Tear energies for all three experimental materials were greater than those of the commercial products. There were statistically significant differences between the two experimental materials that contained magnesium oxide and one that did not. With regard to setting time, statistically significant differences were seen between commercial materials and two of the experimental materials. The experimental material that did not contain magnesium oxide had a considerably longer setting time than all of the other materials tested. Significance The key role of magnesium oxide in the setting reaction and the effect on hardness have been demonstrated and discussed.

  • Dimensional changes of alginate Dental Impression materials
    Journal of Materials Science: Materials in Medicine, 2006
    Co-Authors: Navina Nallamuthu, M Braden, M P Patel
    Abstract:

    The weight loss and corresponding dimensional changes of two Dental alginate Impression materials have been studied. The weight loss kinetics indicate this to be a diffusion controlled process, but with a boundary condition at the surface of the concentration decreasing exponentially with time. This is in marked contrast to most desorption processes, where the surface concentration becomes instantaneously zero. The appropriate theory has been developed for an exponential boundary condition, and its predictions compared with experimental data; the agreement was satisfactory. The diffusion coefficients for two thicknesses of the same material were not identical as predicted by theory; the possible reasons for this are discussed.

Amit Punj - One of the best experts on this subject based on the ideXlab platform.

  • Dental Impression materials and techniques
    Dental Clinics of North America, 2017
    Co-Authors: Amit Punj, Despoina Bompolaki, Jorge L Garaicoa
    Abstract:

    : Dental Impression making is the process of creating a negative form of the teeth and oral tissues, into which gypsum or other die materials can be processed to create working analogues. Contemporary dentistry generates new information every year and digital dentistry is becoming established and influential. Although dentists should stay abreast of new technologies, some of the conventional materials and time-tested techniques remain widely used. It is important to review the Impression-making process to ensure that practitioners have up-to-date information about how to safely and effectively capture the exact form of the oral tissues to provide optimal patient management.

Peter M Jakob - One of the best experts on this subject based on the ideXlab platform.

  • in vivo mri based Dental Impression using an intraoral rf receiver coil
    Concepts in Magnetic Resonance Part B-magnetic Resonance Engineering, 2008
    Co-Authors: Olga Tymofiyeva, Kurt Rottner, D Gareis, Julian Boldt, Florian Schmid, Marcos A Lopez, Ernstjurgen Richter, Peter M Jakob
    Abstract:

    The MRI-based contrast-enhanced method of tooth surface digitization provides an alternative possibility for making a Dental Impression. It has recently been demonstrated that tooth surface digitization with an accuracy sufficient for production of Dental restorations is possible using a clinical whole-body MRI scanner. However, for an in vivo application of the technique, the required high nominal resolution and signal-to- noise ratio have to be achieved within reasonable measurement times. Existing radio fre- quency (RF) volume and surface coils have not been able to fulfill this requirement. The objective of this work was to develop a dedicated RF receiver coil for contrast-enhanced Dental MRI which provides a high sensitivity in the region of the whole Dental arch and allows for application of the contrast media into the mouth of the patient. To achieve this goal, an intraoral Dental coil design with a built-in contrast medium applicator was devel- oped and implemented. The coil was shown to enable high-resolution contrast-enhanced Dental MRI in vivo. This was demonstrated on four teeth prepared for Dental restorations. The average accuracy obtained for all four teeth was below 100 lm. For two of the teeth, copings were modeled based on MRI data and produced from zirconium oxide using computer-aided design and manufacturing (CAD/CAM) technology. 2008 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 33B: 244-251, 2008

  • In vivo MRI‐based Dental Impression using an intraoral RF receiver coil
    Concepts in Magnetic Resonance Part B-magnetic Resonance Engineering, 2008
    Co-Authors: Olga Tymofiyeva, Kurt Rottner, D Gareis, Julian Boldt, Florian Schmid, Marcos A Lopez, Ernstjurgen Richter, Peter M Jakob
    Abstract:

    The MRI-based contrast-enhanced method of tooth surface digitization provides an alternative possibility for making a Dental Impression. It has recently been demonstrated that tooth surface digitization with an accuracy sufficient for production of Dental restorations is possible using a clinical whole-body MRI scanner. However, for an in vivo application of the technique, the required high nominal resolution and signal-to- noise ratio have to be achieved within reasonable measurement times. Existing radio fre- quency (RF) volume and surface coils have not been able to fulfill this requirement. The objective of this work was to develop a dedicated RF receiver coil for contrast-enhanced Dental MRI which provides a high sensitivity in the region of the whole Dental arch and allows for application of the contrast media into the mouth of the patient. To achieve this goal, an intraoral Dental coil design with a built-in contrast medium applicator was devel- oped and implemented. The coil was shown to enable high-resolution contrast-enhanced Dental MRI in vivo. This was demonstrated on four teeth prepared for Dental restorations. The average accuracy obtained for all four teeth was below 100 lm. For two of the teeth, copings were modeled based on MRI data and produced from zirconium oxide using computer-aided design and manufacturing (CAD/CAM) technology. 2008 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 33B: 244-251, 2008

Navina Nallamuthu - One of the best experts on this subject based on the ideXlab platform.

  • some aspects of the formulation of alginate Dental Impression materials setting characteristics and mechanical properties
    Dental Materials, 2012
    Co-Authors: Navina Nallamuthu, M Braden, M P Patel
    Abstract:

    Abstract Objective To study the role of the various components of alginate Dental Impression materials. Methods Experimental materials were formulated and their physical properties characterized and compared to commercially available counterparts (Neocolloid, Palgat Plus and Blueprint Cremix). Properties examined were: dimensional stability and weight change in water and artificial saliva; setting behavior; Shore A hardness and tear energy. The role of magnesium oxide was also investigated. Results Weight changes in water and artificial saliva can be attributed to an initial thermodynamic potential owing to the ionic content of the alginate, causing water to diffuse into the material. Water is then driven back out following a reversal of this potential. Hardness results for experimental materials were within the range obtained from the commercial materials. The hardness value for an experimental formulation that did not contain magnesium oxide was lower than values from the other experimental materials that did. Tear energies for all three experimental materials were greater than those of the commercial products. There were statistically significant differences between the two experimental materials that contained magnesium oxide and one that did not. With regard to setting time, statistically significant differences were seen between commercial materials and two of the experimental materials. The experimental material that did not contain magnesium oxide had a considerably longer setting time than all of the other materials tested. Significance The key role of magnesium oxide in the setting reaction and the effect on hardness have been demonstrated and discussed.

  • Some aspects of the formulation of alginate Dental Impression materials—Setting characteristics and mechanical properties
    Dental Materials, 2012
    Co-Authors: Navina Nallamuthu, M Braden, M P Patel
    Abstract:

    Abstract Objective To study the role of the various components of alginate Dental Impression materials. Methods Experimental materials were formulated and their physical properties characterized and compared to commercially available counterparts (Neocolloid, Palgat Plus and Blueprint Cremix). Properties examined were: dimensional stability and weight change in water and artificial saliva; setting behavior; Shore A hardness and tear energy. The role of magnesium oxide was also investigated. Results Weight changes in water and artificial saliva can be attributed to an initial thermodynamic potential owing to the ionic content of the alginate, causing water to diffuse into the material. Water is then driven back out following a reversal of this potential. Hardness results for experimental materials were within the range obtained from the commercial materials. The hardness value for an experimental formulation that did not contain magnesium oxide was lower than values from the other experimental materials that did. Tear energies for all three experimental materials were greater than those of the commercial products. There were statistically significant differences between the two experimental materials that contained magnesium oxide and one that did not. With regard to setting time, statistically significant differences were seen between commercial materials and two of the experimental materials. The experimental material that did not contain magnesium oxide had a considerably longer setting time than all of the other materials tested. Significance The key role of magnesium oxide in the setting reaction and the effect on hardness have been demonstrated and discussed.

  • Dimensional changes of alginate Dental Impression materials
    Journal of Materials Science: Materials in Medicine, 2006
    Co-Authors: Navina Nallamuthu, M Braden, M P Patel
    Abstract:

    The weight loss and corresponding dimensional changes of two Dental alginate Impression materials have been studied. The weight loss kinetics indicate this to be a diffusion controlled process, but with a boundary condition at the surface of the concentration decreasing exponentially with time. This is in marked contrast to most desorption processes, where the surface concentration becomes instantaneously zero. The appropriate theory has been developed for an exponential boundary condition, and its predictions compared with experimental data; the agreement was satisfactory. The diffusion coefficients for two thicknesses of the same material were not identical as predicted by theory; the possible reasons for this are discussed.