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Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Dimensional changes of alginate dental impression materials.
N Nallamuthu1, M Braden, M P Patel
1IRC in Biomedical Materials, Department of Biomaterials in Relation to Dentistry, Medical Sciences Building, Queen Mary, University of London, Mile End Road, London, E1 4NS.
Journal of Materials Science. Materials in Medicine
|December 5, 2006
Summary
Dental alginate impression materials undergo weight loss via diffusion, not instantaneous surface concentration loss. New theory explains this exponential boundary condition, aligning with experimental data for improved material understanding.
Area of Science:
- Materials Science
- Dental Materials Science
- Physical Chemistry
Background:
- Dental alginate impression materials are crucial for prosthodontic and orthodontic applications.
- Understanding material behavior, such as dimensional stability and weight loss, is vital for clinical success.
- Existing models for desorption processes often assume instantaneous surface concentration depletion, which may not accurately reflect all material behaviors.
Purpose of the Study:
- To investigate the weight loss and dimensional changes in dental alginate impression materials.
- To analyze the kinetics of weight loss and determine the underlying diffusion process.
- To develop and validate a theoretical model for diffusion-controlled weight loss with an exponential surface concentration boundary condition.
Main Methods:
- Experimental measurement of weight loss and dimensional changes over time for two dental alginate impression materials.
- Kinetic analysis of the weight loss data to identify the diffusion mechanism.
- Development of a theoretical framework to describe diffusion with an exponential surface concentration decay.
- Comparison of theoretical predictions with experimental results.
Main Results:
- Weight loss in dental alginate impression materials follows a diffusion-controlled process.
- The surface concentration decreases exponentially over time, deviating from the typical instantaneous zero assumption.
- The developed theory for an exponential boundary condition showed satisfactory agreement with experimental data.
- Observed diffusion coefficients varied with material thickness, contrary to theoretical predictions.
Conclusions:
- The study successfully modeled the diffusion-controlled weight loss of dental alginate impression materials using a novel exponential boundary condition.
- The findings highlight the importance of considering specific boundary conditions in diffusion studies of dental materials.
- Discrepancies in diffusion coefficients suggest further investigation into factors influencing diffusion in materials of different thicknesses is warranted.
