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Dental Wear Simulator - ElectroForce 3330 Test Instrument
Bose introduces the ElectroForce biaxial testing configuration to simulate the masticatory cycle (chewing) for the evaluation of dental biomaterials and/or restoration techniques. Thus, the effectiveness of sealants or enamel replacements can be assessed in the laboratory. This wear simulator is useful for evaluating 2 body wear and can effectively run hundreds of thousands of cycles. The wear produced by 250,000 masticatory cycles on this type of simulator corresponds to the wear measured after 1 year of clinical service (Delong, et. al. 1985; Sakaguchi, et. Al. 1986; and Krejc et. al. 1990).
The three phases of mastication, preparatory, crushing and gliding (grinding) phase operate under different system control modes. The preparatory and crushing phases (vertical motion) are accomplished under load control while the gliding phase (horizontal) is carried out in displacement control as defined by the tooth anatomy. Mastication during the gliding phase is described by eccentric contact of the mandibular buccal cusps with the inner inclines of the maxillary buccal cusps followed by the working movement to the centric occlusion.
Essentially, this 3D masticatory motion is simplified in 2D by aligning linear motors to the desired planes of motion. One linear motor directs vertically to provide frontal plane motion that is defined by the occlusal anatomy while a 2nd linear motor provides a straight line approximation of horizontal motion.
Vertical loading during the glide phase is accomplished by programming a load profile (waveform) to the linear motor that is under close loop load control. This load wave form is a haversine constant load which closely simulates anatomical loading. Typical load profiles range from 5-1000 N although the system is capable of providing up to 2500 N.
Mastication is dictated by the horizontal motion that is under displacement control while the vertical actuator is under load control during the glide phase. The system can provide a glide phase duration ranging from .1 to .4 seconds but .25 - .30 seconds is typical. Control of the vertical actuator switches to displacement control in the preparatory and crushing phases and back to load control on contact with the opposing tooth during the gliding phase. The control loops for the ElectroForce linear motors are synchronized to provide accurate 2D motions mastication cycle frequencies to 2Hz.
Click here for a complete Application Description of the ElectroForce 3300 Wear Simulator.
Click here for the ElectroForce family product brochure.
For more on the ElectroForce Advantage click here.
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Toll Free 1-866-TESTING
(1-866-837-8464) |
| ElectroForce Test Instruments for Materials Testing and Medical Device Development |
Bose Corporation  ElectroForce Systems Group |
| 10250 Valley View Road, Suite 113 |
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Eden Prairie, Minnesota 55344 USA |
| 952.278.3070 |
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FAX: 952.278.3071 |
electroforce@bose.com
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