Abstract
For evaluating the impact strength of dental materials, the Izod test or Charpy test has been used, but specimen preparation for these tests is difficult due to the adjustment of a notch on them. By contrast, a weight-drop impact test does not require notched specimens. Therefore, it might be possible to measure the impact strength more accurately than conventional methods. This study aimed to establish appropriate conditions for applying the weight-drop impact test on small specimens of acrylic resin. To determine the most reliable impact fracture energy of acrylic resins, different diameters and thicknesses of PMMA resin specimens, diameters and weights of the striker, and diameters of the supporting jig were compared. For all specimen thicknesses, when the striker diameter was 6–10 mm, the impact fracture energy was constant when the inner diameter of the specimen-supporting jig was 8–10 mm. In addition, the measured E50% value was mostly equal to the median value of the impact fracture energy. Thus, for the weight-drop impact test, this method was effective for material testing of small specimens, by clearly specifying the test conditions, such as the thickness of disc-shaped specimens, the diameter of the striker, and the inner diameter of the specimen-supporting jig.
Highlights
Numerous impact forces, including instantaneous occlusal pressure [1], falling of dentures [2], and occlusal tapping during sleep [3], exert a load on dental materials in daily life
The ultimate goal of this project was to establish the application of the weight-drop impact test on small specimens of rigid dental materials
Each whisker is 1.5 times the interquartile range (IQR), and values that are outside this range are referred to as outliers and are denoted by a circle
Summary
Numerous impact forces, including instantaneous occlusal pressure [1], falling of dentures [2], and occlusal tapping during sleep [3], exert a load on dental materials in daily life. Such impact forces sometimes cause fractures or cracks in dental prostheses. Dynamic test methods are used to assess the characteristics of dental materials to withstand these impacts. These tests differ from tests of static mechanical strength, such as tensile strength and hardness, and demonstrate the behavior characteristic of the materials [4]. It is important to evaluate the impact strength of tooth colored materials for further development
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