IADR Abstract Archives
A New Photoelastic Dental Model for 3D Photoelasticity Applications.
Objectives: The aim of this study is to construct a resin dental model of the teeth and supporting bone produced from two materials that have modulii of elasticity of the same ration as that of tooth to bone in order to carry out photoelasticy experiments.
Photoelasticity is a useful technique to evaluate the stress distribution in dental applications. However most of the studies highlighted the use of intergrated 3D photoelasticity at room temperature with a little can be concluded regarding the state of stress at any point. This study aims to use a stress freezing technique to allow accurate analysis of interior stresses at specific points and locations.
Methods: To estimate and mimic the tooth-bone modulus of elasticity ratio, four materials have been tested in this study: epoxy resins PL1, and PL2 (Vishay Precision Group, USA); epoxy resin Araldite 2020 (Huntsman Advanced Materials, Swiss) and PMMA (Candulor AG, Germany).
Sample were prepared to ISO Standarization (1567) for 3-point bend testing at a dimension of (65x10x2.5mm). The specimens tested using Dynamic Mechanical Analyser machine (DMA) with supporting span of 30mm (Perkin Elmer DMA 8000). The temperature monitoring from low to high was performed with a heating rate of 2°C/min at an oscillation frequency of 0.05mm. In oder to select the appropriate material for model construction the material ratio was determined as: E(tooth substitue material) at Tg(bone substitute material) /E(bone substitute material) at Tg = E(dentine) /E(bone).
Results: The elastic modulus of each material at Tg is shown in Table (1). The elastic modulus of each material at the Tg of the other materials tested is also shown where applicable.
Conclusions: This study concluded that the Araldite 2020 with PL1 fabricated by using (DMA) could mimic the tooth-bone modulus of elasitisity ratio. This ratio suggests the technique may give a promise to be used as a dental model to evaluate the stess distribution over supporting stractures.
Photoelasticity is a useful technique to evaluate the stress distribution in dental applications. However most of the studies highlighted the use of intergrated 3D photoelasticity at room temperature with a little can be concluded regarding the state of stress at any point. This study aims to use a stress freezing technique to allow accurate analysis of interior stresses at specific points and locations.
Methods: To estimate and mimic the tooth-bone modulus of elasticity ratio, four materials have been tested in this study: epoxy resins PL1, and PL2 (Vishay Precision Group, USA); epoxy resin Araldite 2020 (Huntsman Advanced Materials, Swiss) and PMMA (Candulor AG, Germany).
Sample were prepared to ISO Standarization (1567) for 3-point bend testing at a dimension of (65x10x2.5mm). The specimens tested using Dynamic Mechanical Analyser machine (DMA) with supporting span of 30mm (Perkin Elmer DMA 8000). The temperature monitoring from low to high was performed with a heating rate of 2°C/min at an oscillation frequency of 0.05mm. In oder to select the appropriate material for model construction the material ratio was determined as: E(tooth substitue material) at Tg(bone substitute material) /E(bone substitute material) at Tg = E(dentine) /E(bone).
Results: The elastic modulus of each material at Tg is shown in Table (1). The elastic modulus of each material at the Tg of the other materials tested is also shown where applicable.
Conclusions: This study concluded that the Araldite 2020 with PL1 fabricated by using (DMA) could mimic the tooth-bone modulus of elasitisity ratio. This ratio suggests the technique may give a promise to be used as a dental model to evaluate the stess distribution over supporting stractures.