Ultrasonic Fatigue Testing on the Polymeric Material PMMA, Used in Odontology Applications

Almaraz, Gonzalo M. Domínguez; Martínez, Amós; Sanchez, R J; Gómez, Erasmo Correa; Tapia, M.G.; Juárez, J.C. Verduzco

doi:10.1016/j.prostr.2017.04.039

Cited by 15 publications

(8 citation statements)

References 23 publications

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“…Further measurements of the mechanical properties of polymers and composites at the ultrasonic frequency range were focused on very high cycle (VHC) fatigue testing as well as on thermographic investigations. Almaraz et al [6] determined the ultrasonic fatigue endurance, the general crack initiation and propagation on the polymeric material PMMA at a frequency of 20 kHz using hourglass-shaped cylindrical specimens. Backe et al [7] carried out fatigue testing of carbon fiber-reinforced polyphenylene sulfide in a very high cycle fatigue regime at ultrasonic frequencies of 20 kHz by means of an ultrasonic testing apparatus for cyclic three-point bending.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Approach for the Determination of the Mechanical Properties of Base-Excited Polymeric Specimens at Higher Frequency Modes

et al. 2022

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Structures made of the thermoplastic polymer polyether ether ketone (PEEK) are widely used in dynamically-loaded applications due to their high-temperature resistance and high mechanical properties. To design these dynamic applications, in addition to the well-known stiffness and strength properties the vibration-damping properties at the given frequencies are required. Depending on the application, frequencies from a few hertz to the ultrasonic range are of interest here. To characterize the frequency-dependent behavior, an experimental approach was chosen and applied to a sample polymer PEEK. The test setup consists of a piezoelectrically driven base excitation of the polymeric specimen and the non-contact measurement of the velocity as well as the surface temperature. The beam’s bending vibrations were analyzed by means of the Timoshenko theory to determine the polymer’s storage modulus. The mechanical loss factor was calculated using the half-power bandwidth method. For PEEK and a considered frequency range of 1 kHz to 16 kHz, a storage modulus between 3.9 GPa and 4.2 GPa and a loss factor between 9 × 10−3 and 17 × 10−3 were determined. For the used experimental parameters, the resulting mechanical properties were not essentially influenced by the amplitude of excitation, the duration of excitation, or thermal degrad.ation due to self-heating, but rather slightly by the clamping force within the fixation area.

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Section: Introductionmentioning

confidence: 99%

An Experimental Approach for the Determination of the Mechanical Properties of Base-Excited Polymeric Specimens at Higher Frequency Modes

et al. 2022

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“…Due to the physical and mechanical properties of PMMA, it is often used. PMMA has good scratch and UV resistance, has a relatively high modulus of elasticity and hardness [ 17 ]. In addition, in orthodontic applications, it is characterized by low moisture absorption, e.g., of saliva, in the oral cavity [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Statistical Comparability of the Hardness and Wear of Polymeric Materials for Orthodontic Applications

et al. 2021

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Background: Clinical success depends on the contact strength and wear resistance of medical devices made of polymer materials. The scientific goal resulted from the problem of using different methods of surface evaluation of materials used in the production of orthodontic appliances. The purpose of the work was an experimental comparative assessment of indentation hardness and scratch hardness and the sliding wear of four selected polymeric materials used in the manufacture of orthodontic appliances. Methods: Four commercial materials were compared. Shore hardness tests and a scratch test with a Rockwell indenter were performed. A sliding wear test was performed using the ball-on-disc method. Statistical PCA and correlation analyses were performed. Results: The results of scratch hardness measurements using a contact profilometer correlated with the Shore hardness to a greater extent than measurements made using an optical microscope. PCA showed that Shore hardness explains 45% of the total variance in all the results across the materials. Conclusions: The scratch hardness method allows for a more explicit ranking of orthodontic polymeric materials when measurements are made with a profilometer. The ranking of sliding wear resistance should be made separately.

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“…Poly(methyl methacrylate) (PMMA) has been widely used in different fields of healthcare. It is used in orthopedics, prosthodontic dentistry and for many other medical its physical and mechanical properties: low affectation by ultraviolet radiation, low elongation at break, highly scratch resistant, low moisture and water absorbing capacity, good dimensional stability, high Young's modulus and hardness, and high volume/weight ratio [12].…”

Section: Introductionmentioning

confidence: 99%

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

et al. 2020

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This paper discusses the issues of strength and creep of polymeric materials used in orthodontic appliances. Orthodontic biomechanics is focused on the movement of individual teeth or dental groups as a result of the force applied by orthodontic appliances. Stresses in the construction of functional and biomechanical appliances is generated when using the apparatus in the oral cavity. The orthodontic appliance must maintain its shape and not be damaged during treatment so strength and creep resistance are fundamental properties. It was assumed that the clinical success of orthodontic appliances can be determined by these performance properties. The aim of the work was the experimental assessment of comparative bending strength and creep resistance of selected popular polymer materials used in the production of biomechanical orthodontic appliances. Four commercial materials manufactured by the world class producers were tested: NextDent Ortho Rigid (Vertex-Dental B.V., Soesterberg, The Netherlands) marked as “1A”; Erkocryl (ERKODENT Erich Kopp GmbH, Pfalzgrafenweiler, Germany)-“2A”; Vertex Orthoplast (Vertex Dental B.V.), blue, marked as “3A” and material with the same name as “3A” but orange, marked in the article as “4A”. All the tests were carried out after aging in artificial saliva for 48 h at a temperature of 37 °C. Flexular strength and flexular modulus were made using the three point bending method according to the ISO 178 technical standard. Creep tests were carried out according to the method contained in ISO 899-2. The creep test was carried out in an artificial saliva bath at 37 °C. The creep tests showed significant differences in the strength, modulus and deformability of the tested materials. The strength reliability of the tested materials also varied. The research shows that the 2A material can be used for orthodontic applications in which long-term stresses should be lower than 20 MPa.

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Ultrasonic Fatigue Testing on the Polymeric Material PMMA, Used in Odontology Applications

Cited by 15 publications

References 23 publications

An Experimental Approach for the Determination of the Mechanical Properties of Base-Excited Polymeric Specimens at Higher Frequency Modes

An Experimental Approach for the Determination of the Mechanical Properties of Base-Excited Polymeric Specimens at Higher Frequency Modes

Analysis of the Statistical Comparability of the Hardness and Wear of Polymeric Materials for Orthodontic Applications

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

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